[#13] Client: Use code analyzers

Signed-off-by: Pavel Gross <p.gross@yadro.com>
2024-09-23 18:53:21 +03:00 · 2024-09-23 18:53:21 +03:00 · d1271df207
commit d1271df207
parent d7dbbf8da8
102 changed files with 2168 additions and 733 deletions
--- a/.editorconfig
+++ b/.editorconfig
@ -0,0 +1,901 @@
+[*.cs]
+
+# CA1001: Types that own disposable fields should be disposable
+dotnet_diagnostic.CA1001.severity = warning
+
+# CA1000: Do not declare static members on generic types
+dotnet_diagnostic.CA1000.severity = warning
+
+# CA1002: Do not expose generic lists
+dotnet_diagnostic.CA1002.severity = warning
+
+# CA1003: Use generic event handler instances
+dotnet_diagnostic.CA1003.severity = warning
+
+# CA1005: Avoid excessive parameters on generic types
+dotnet_diagnostic.CA1005.severity = warning
+
+# CA1008: Enums should have zero value
+dotnet_diagnostic.CA1008.severity = warning
+
+# CA1010: Generic interface should also be implemented
+dotnet_diagnostic.CA1010.severity = warning
+
+# CA1012: Abstract types should not have public constructors
+dotnet_diagnostic.CA1012.severity = warning
+
+# CA1014: Mark assemblies with CLSCompliant
+dotnet_diagnostic.CA1014.severity = warning
+
+# CA1016: Mark assemblies with assembly version
+dotnet_diagnostic.CA1016.severity = warning
+
+# CA1017: Mark assemblies with ComVisible
+dotnet_diagnostic.CA1017.severity = warning
+
+# CA1018: Mark attributes with AttributeUsageAttribute
+dotnet_diagnostic.CA1018.severity = warning
+
+# CA1019: Define accessors for attribute arguments
+dotnet_diagnostic.CA1019.severity = warning
+
+# CA1021: Avoid out parameters
+dotnet_diagnostic.CA1021.severity = warning
+
+# CA1024: Use properties where appropriate
+dotnet_diagnostic.CA1024.severity = warning
+
+# CA1027: Mark enums with FlagsAttribute
+dotnet_diagnostic.CA1027.severity = warning
+
+# CA1028: Enum Storage should be Int32
+dotnet_diagnostic.CA1028.severity = warning
+
+# CA1030: Use events where appropriate
+dotnet_diagnostic.CA1030.severity = warning
+
+# CA1031: Do not catch general exception types
+dotnet_diagnostic.CA1031.severity = warning
+
+# CA1033: Interface methods should be callable by child types
+dotnet_diagnostic.CA1033.severity = warning
+
+# CA1034: Nested types should not be visible
+dotnet_diagnostic.CA1034.severity = warning
+
+# CA1036: Override methods on comparable types
+dotnet_diagnostic.CA1036.severity = warning
+
+# CA1040: Avoid empty interfaces
+dotnet_diagnostic.CA1040.severity = warning
+
+# CA1041: Provide ObsoleteAttribute message
+dotnet_diagnostic.CA1041.severity = warning
+
+# CA1043: Use Integral Or String Argument For Indexers
+dotnet_diagnostic.CA1043.severity = warning
+
+# CA1044: Properties should not be write only
+dotnet_diagnostic.CA1044.severity = warning
+
+# CA1045: Do not pass types by reference
+dotnet_diagnostic.CA1045.severity = warning
+
+# CA1046: Do not overload equality operator on reference types
+dotnet_diagnostic.CA1046.severity = warning
+
+# CA1050: Declare types in namespaces
+dotnet_diagnostic.CA1050.severity = warning
+
+# CA1051: Do not declare visible instance fields
+dotnet_diagnostic.CA1051.severity = warning
+
+# CA1052: Static holder types should be Static or NotInheritable
+dotnet_diagnostic.CA1052.severity = warning
+
+# CA1054: URI-like parameters should not be strings
+dotnet_diagnostic.CA1054.severity = warning
+
+# CA1055: URI-like return values should not be strings
+dotnet_diagnostic.CA1055.severity = warning
+
+# CA1056: URI-like properties should not be strings
+dotnet_diagnostic.CA1056.severity = warning
+
+# CA1058: Types should not extend certain base types
+dotnet_diagnostic.CA1058.severity = warning
+
+# CA1060: Move pinvokes to native methods class
+dotnet_diagnostic.CA1060.severity = warning
+
+# CA1061: Do not hide base class methods
+dotnet_diagnostic.CA1061.severity = warning
+
+# CA1062: Validate arguments of public methods
+dotnet_diagnostic.CA1062.severity = warning
+
+# CA1063: Implement IDisposable Correctly
+dotnet_diagnostic.CA1063.severity = warning
+
+# CA1064: Exceptions should be public
+dotnet_diagnostic.CA1064.severity = warning
+
+# CA1065: Do not raise exceptions in unexpected locations
+dotnet_diagnostic.CA1065.severity = warning
+
+# CA1066: Implement IEquatable when overriding Object.Equals
+dotnet_diagnostic.CA1066.severity = warning
+
+# CA1067: Override Object.Equals(object) when implementing IEquatable<T>
+dotnet_diagnostic.CA1067.severity = warning
+
+# CA1068: CancellationToken parameters must come last
+dotnet_diagnostic.CA1068.severity = warning
+
+# CA1069: Enums values should not be duplicated
+dotnet_diagnostic.CA1069.severity = warning
+
+# CA1070: Do not declare event fields as virtual
+dotnet_diagnostic.CA1070.severity = warning
+
+# CA1303: Do not pass literals as localized parameters
+dotnet_diagnostic.CA1303.severity = warning
+
+# CA1304: Specify CultureInfo
+dotnet_diagnostic.CA1304.severity = warning
+
+# CA1305: Specify IFormatProvider
+dotnet_diagnostic.CA1305.severity = warning
+
+# CA1307: Specify StringComparison for clarity
+dotnet_diagnostic.CA1307.severity = warning
+
+# CA1308: Normalize strings to uppercase
+dotnet_diagnostic.CA1308.severity = warning
+
+# CA1310: Specify StringComparison for correctness
+dotnet_diagnostic.CA1310.severity = warning
+
+# CA1401: P/Invokes should not be visible
+dotnet_diagnostic.CA1401.severity = warning
+
+# CA1416: Validate platform compatibility
+dotnet_diagnostic.CA1416.severity = warning
+
+# CA1417: Do not use 'OutAttribute' on string parameters for P/Invokes
+dotnet_diagnostic.CA1417.severity = warning
+
+# CA1418: Use valid platform string
+dotnet_diagnostic.CA1418.severity = warning
+
+# CA1419: Provide a parameterless constructor that is as visible as the containing type for concrete types derived from 'System.Runtime.InteropServices.SafeHandle'
+dotnet_diagnostic.CA1419.severity = warning
+
+# CA1420: Property, type, or attribute requires runtime marshalling
+dotnet_diagnostic.CA1420.severity = warning
+
+# CA1421: This method uses runtime marshalling even when the 'DisableRuntimeMarshallingAttribute' is applied
+dotnet_diagnostic.CA1421.severity = warning
+
+# CA1422: Validate platform compatibility
+dotnet_diagnostic.CA1422.severity = warning
+
+# CA1501: Avoid excessive inheritance
+dotnet_diagnostic.CA1501.severity = warning
+
+# CA1502: Avoid excessive complexity
+dotnet_diagnostic.CA1502.severity = warning
+
+# CA1505: Avoid unmaintainable code
+dotnet_diagnostic.CA1505.severity = warning
+
+# CA1506: Avoid excessive class coupling
+# dotnet_diagnostic.CA1506.severity = warning
+
+# CA1509: Invalid entry in code metrics rule specification file
+dotnet_diagnostic.CA1509.severity = warning
+
+# CA1510: Use ArgumentNullException throw helper
+dotnet_diagnostic.CA1510.severity = warning
+
+# CA1511: Use ArgumentException throw helper
+dotnet_diagnostic.CA1511.severity = warning
+
+# CA1512: Use ArgumentOutOfRangeException throw helper
+dotnet_diagnostic.CA1512.severity = warning
+
+# CA1513: Use ObjectDisposedException throw helper
+dotnet_diagnostic.CA1513.severity = warning
+
+# CA1700: Do not name enum values 'Reserved'
+dotnet_diagnostic.CA1700.severity = warning
+
+# CA1707: Identifiers should not contain underscores
+dotnet_diagnostic.CA1707.severity = warning
+
+# CA1708: Identifiers should differ by more than case
+dotnet_diagnostic.CA1708.severity = warning
+
+# CA1710: Identifiers should have correct suffix
+dotnet_diagnostic.CA1710.severity = warning
+
+# CA1711: Identifiers should not have incorrect suffix
+dotnet_diagnostic.CA1711.severity = warning
+
+# CA1712: Do not prefix enum values with type name
+dotnet_diagnostic.CA1712.severity = warning
+
+# CA1713: Events should not have 'Before' or 'After' prefix
+dotnet_diagnostic.CA1713.severity = warning
+
+# CA1715: Identifiers should have correct prefix
+dotnet_diagnostic.CA1715.severity = warning
+
+# CA1716: Identifiers should not match keywords
+dotnet_diagnostic.CA1716.severity = warning
+
+# CA1720: Identifier contains type name
+dotnet_diagnostic.CA1720.severity = warning
+
+# CA1721: Property names should not match get methods
+dotnet_diagnostic.CA1721.severity = warning
+
+# CA1724: Type names should not match namespaces
+dotnet_diagnostic.CA1724.severity = warning
+
+# CA1725: Parameter names should match base declaration
+dotnet_diagnostic.CA1725.severity = warning
+
+# CA1727: Use PascalCase for named placeholders
+dotnet_diagnostic.CA1727.severity = warning
+
+# CA1806: Do not ignore method results
+dotnet_diagnostic.CA1806.severity = warning
+
+# CA1810: Initialize reference type static fields inline
+dotnet_diagnostic.CA1810.severity = warning
+
+# CA1813: Avoid unsealed attributes
+dotnet_diagnostic.CA1813.severity = warning
+
+# CA1814: Prefer jagged arrays over multidimensional
+dotnet_diagnostic.CA1814.severity = warning
+
+# CA1815: Override equals and operator equals on value types
+dotnet_diagnostic.CA1815.severity = warning
+
+# CA1816: Dispose methods should call SuppressFinalize
+dotnet_diagnostic.CA1816.severity = warning
+
+# CA1819: Properties should not return arrays
+# dotnet_diagnostic.CA1819.severity = warning
+
+# CA1820: Test for empty strings using string length
+dotnet_diagnostic.CA1820.severity = warning
+
+# CA1821: Remove empty Finalizers
+dotnet_diagnostic.CA1821.severity = warning
+
+# CA1822: Mark members as static
+dotnet_diagnostic.CA1822.severity = warning
+
+# CA1823: Avoid unused private fields
+dotnet_diagnostic.CA1823.severity = warning
+
+# CA1826: Do not use Enumerable methods on indexable collections
+dotnet_diagnostic.CA1826.severity = warning
+
+# CA1827: Do not use Count() or LongCount() when Any() can be used
+dotnet_diagnostic.CA1827.severity = warning
+
+# CA1828: Do not use CountAsync() or LongCountAsync() when AnyAsync() can be used
+dotnet_diagnostic.CA1828.severity = warning
+
+# CA1829: Use Length/Count property instead of Count() when available
+dotnet_diagnostic.CA1829.severity = warning
+
+# CA1830: Prefer strongly-typed Append and Insert method overloads on StringBuilder
+dotnet_diagnostic.CA1830.severity = warning
+
+# CA1831: Use AsSpan or AsMemory instead of Range-based indexers when appropriate
+dotnet_diagnostic.CA1831.severity = warning
+
+# CA1832: Use AsSpan or AsMemory instead of Range-based indexers when appropriate
+dotnet_diagnostic.CA1832.severity = warning
+
+# CA1833: Use AsSpan or AsMemory instead of Range-based indexers when appropriate
+dotnet_diagnostic.CA1833.severity = warning
+
+# CA1834: Consider using 'StringBuilder.Append(char)' when applicable
+dotnet_diagnostic.CA1834.severity = warning
+
+# CA1835: Prefer the 'Memory'-based overloads for 'ReadAsync' and 'WriteAsync'
+dotnet_diagnostic.CA1835.severity = warning
+
+# CA1836: Prefer IsEmpty over Count
+dotnet_diagnostic.CA1836.severity = warning
+
+# CA1837: Use 'Environment.ProcessId'
+dotnet_diagnostic.CA1837.severity = warning
+
+# CA1838: Avoid 'StringBuilder' parameters for P/Invokes
+dotnet_diagnostic.CA1838.severity = warning
+
+# CA1839: Use 'Environment.ProcessPath'
+dotnet_diagnostic.CA1839.severity = warning
+
+# CA1840: Use 'Environment.CurrentManagedThreadId'
+dotnet_diagnostic.CA1840.severity = warning
+
+# CA1842: Do not use 'WhenAll' with a single task
+dotnet_diagnostic.CA1842.severity = warning
+
+# CA1843: Do not use 'WaitAll' with a single task
+dotnet_diagnostic.CA1843.severity = warning
+
+# CA1844: Provide memory-based overrides of async methods when subclassing 'Stream'
+dotnet_diagnostic.CA1844.severity = warning
+
+# CA1846: Prefer 'AsSpan' over 'Substring'
+dotnet_diagnostic.CA1846.severity = warning
+
+# CA1847: Use char literal for a single character lookup
+dotnet_diagnostic.CA1847.severity = warning
+
+# CA1848: Use the LoggerMessage delegates
+dotnet_diagnostic.CA1848.severity = warning
+
+# CA1849: Call async methods when in an async method
+dotnet_diagnostic.CA1849.severity = warning
+
+# CA1850: Prefer static 'HashData' method over 'ComputeHash'
+dotnet_diagnostic.CA1850.severity = warning
+
+# CA1852: Seal internal types
+dotnet_diagnostic.CA1852.severity = warning
+
+# CA1853: Unnecessary call to 'Dictionary.ContainsKey(key)'
+dotnet_diagnostic.CA1853.severity = warning
+
+# CA1854: Prefer the 'IDictionary.TryGetValue(TKey, out TValue)' method
+dotnet_diagnostic.CA1854.severity = warning
+
+# CA1858: Use 'StartsWith' instead of 'IndexOf'
+dotnet_diagnostic.CA1858.severity = warning
+
+# CA1859: Use concrete types when possible for improved performance
+dotnet_diagnostic.CA1859.severity = warning
+
+# CA1860: Avoid using 'Enumerable.Any()' extension method
+dotnet_diagnostic.CA1860.severity = warning
+
+# CA1861: Avoid constant arrays as arguments
+dotnet_diagnostic.CA1861.severity = warning
+
+# CA1862: Use the 'StringComparison' method overloads to perform case-insensitive string comparisons
+dotnet_diagnostic.CA1862.severity = warning
+
+# CA1863: Use 'CompositeFormat'
+dotnet_diagnostic.CA1863.severity = warning
+
+# CA1864: Prefer the 'IDictionary.TryAdd(TKey, TValue)' method
+dotnet_diagnostic.CA1864.severity = warning
+
+# CA1868: Unnecessary call to 'Contains(item)'
+dotnet_diagnostic.CA1868.severity = warning
+
+# CA1869: Cache and reuse 'JsonSerializerOptions' instances
+dotnet_diagnostic.CA1869.severity = warning
+
+# CA2000: Dispose objects before losing scope
+dotnet_diagnostic.CA2000.severity = warning
+
+# CA2002: Do not lock on objects with weak identity
+dotnet_diagnostic.CA2002.severity = warning
+
+# CA2007: Consider calling ConfigureAwait on the awaited task
+dotnet_diagnostic.CA2007.severity = warning
+
+# CA2008: Do not create tasks without passing a TaskScheduler
+dotnet_diagnostic.CA2008.severity = warning
+
+# CA2009: Do not call ToImmutableCollection on an ImmutableCollection value
+dotnet_diagnostic.CA2009.severity = warning
+
+# CA2011: Avoid infinite recursion
+dotnet_diagnostic.CA2011.severity = warning
+
+# CA2012: Use ValueTasks correctly
+dotnet_diagnostic.CA2012.severity = warning
+
+# CA2013: Do not use ReferenceEquals with value types
+dotnet_diagnostic.CA2013.severity = warning
+
+# CA2015: Do not define finalizers for types derived from MemoryManager<T>
+dotnet_diagnostic.CA2015.severity = warning
+
+# CA2017: Parameter count mismatch
+dotnet_diagnostic.CA2017.severity = warning
+
+# CA2018: 'Buffer.BlockCopy' expects the number of bytes to be copied for the 'count' argument
+dotnet_diagnostic.CA2018.severity = warning
+
+# CA2019: Improper 'ThreadStatic' field initialization
+dotnet_diagnostic.CA2019.severity = warning
+
+# CA2021: Do not call Enumerable.Cast<T> or Enumerable.OfType<T> with incompatible types
+dotnet_diagnostic.CA2021.severity = warning
+
+# CA2100: Review SQL queries for security vulnerabilities
+dotnet_diagnostic.CA2100.severity = warning
+
+# CA2101: Specify marshaling for P/Invoke string arguments
+dotnet_diagnostic.CA2101.severity = warning
+
+# CA2119: Seal methods that satisfy private interfaces
+dotnet_diagnostic.CA2119.severity = warning
+
+# CA2153: Do Not Catch Corrupted State Exceptions
+dotnet_diagnostic.CA2153.severity = warning
+
+# CA2200: Rethrow to preserve stack details
+dotnet_diagnostic.CA2200.severity = warning
+
+# CA2201: Do not raise reserved exception types
+dotnet_diagnostic.CA2201.severity = warning
+
+# CA2207: Initialize value type static fields inline
+dotnet_diagnostic.CA2207.severity = warning
+
+# CA2208: Instantiate argument exceptions correctly
+dotnet_diagnostic.CA2208.severity = warning
+
+# CA2211: Non-constant fields should not be visible
+dotnet_diagnostic.CA2211.severity = warning
+
+# CA2213: Disposable fields should be disposed
+dotnet_diagnostic.CA2213.severity = warning
+
+# CA2214: Do not call overridable methods in constructors
+dotnet_diagnostic.CA2214.severity = warning
+
+# CA2215: Dispose methods should call base class dispose
+dotnet_diagnostic.CA2215.severity = warning
+
+# CA2216: Disposable types should declare finalizer
+dotnet_diagnostic.CA2216.severity = warning
+
+# CA2217: Do not mark enums with FlagsAttribute
+dotnet_diagnostic.CA2217.severity = warning
+
+# CA2219: Do not raise exceptions in finally clauses
+dotnet_diagnostic.CA2219.severity = warning
+
+# CA2225: Operator overloads have named alternates
+dotnet_diagnostic.CA2225.severity = warning
+
+# CA2226: Operators should have symmetrical overloads
+dotnet_diagnostic.CA2226.severity = warning
+
+# CA2227: Collection properties should be read only
+dotnet_diagnostic.CA2227.severity = warning
+
+# CA2231: Overload operator equals on overriding value type Equals
+dotnet_diagnostic.CA2231.severity = warning
+
+# CA2235: Mark all non-serializable fields
+dotnet_diagnostic.CA2235.severity = warning
+
+# CA2237: Mark ISerializable types with serializable
+dotnet_diagnostic.CA2237.severity = warning
+
+# CA2241: Provide correct arguments to formatting methods
+dotnet_diagnostic.CA2241.severity = warning
+
+# CA2242: Test for NaN correctly
+dotnet_diagnostic.CA2242.severity = warning
+
+# CA2243: Attribute string literals should parse correctly
+dotnet_diagnostic.CA2243.severity = warning
+
+# CA2244: Do not duplicate indexed element initializations
+dotnet_diagnostic.CA2244.severity = warning
+
+# CA2245: Do not assign a property to itself
+dotnet_diagnostic.CA2245.severity = warning
+
+# CA2246: Assigning symbol and its member in the same statement
+dotnet_diagnostic.CA2246.severity = warning
+
+# CA2247: Argument passed to TaskCompletionSource constructor should be TaskCreationOptions enum instead of TaskContinuationOptions enum
+dotnet_diagnostic.CA2247.severity = warning
+
+# CA2248: Provide correct 'enum' argument to 'Enum.HasFlag'
+dotnet_diagnostic.CA2248.severity = warning
+
+# CA2249: Consider using 'string.Contains' instead of 'string.IndexOf'
+dotnet_diagnostic.CA2249.severity = warning
+
+# CA2250: Use 'ThrowIfCancellationRequested'
+dotnet_diagnostic.CA2250.severity = warning
+
+# CA2251: Use 'string.Equals'
+dotnet_diagnostic.CA2251.severity = warning
+
+# CA2253: Named placeholders should not be numeric values
+dotnet_diagnostic.CA2253.severity = warning
+
+# CA2254: Template should be a static expression
+dotnet_diagnostic.CA2254.severity = warning
+
+# CA2255: The 'ModuleInitializer' attribute should not be used in libraries
+dotnet_diagnostic.CA2255.severity = warning
+
+# CA2256: All members declared in parent interfaces must have an implementation in a DynamicInterfaceCastableImplementation-attributed interface
+dotnet_diagnostic.CA2256.severity = warning
+
+# CA2257: Members defined on an interface with the 'DynamicInterfaceCastableImplementationAttribute' should be 'static'
+dotnet_diagnostic.CA2257.severity = warning
+
+# CA2258: Providing a 'DynamicInterfaceCastableImplementation' interface in Visual Basic is unsupported
+dotnet_diagnostic.CA2258.severity = warning
+
+# CA2259: 'ThreadStatic' only affects static fields
+dotnet_diagnostic.CA2259.severity = warning
+
+# CA2261: Do not use ConfigureAwaitOptions.SuppressThrowing with Task<TResult>
+dotnet_diagnostic.CA2261.severity = warning
+
+# CA2300: Do not use insecure deserializer BinaryFormatter
+dotnet_diagnostic.CA2300.severity = warning
+
+# CA2301: Do not call BinaryFormatter.Deserialize without first setting BinaryFormatter.Binder
+dotnet_diagnostic.CA2301.severity = warning
+
+# CA2302: Ensure BinaryFormatter.Binder is set before calling BinaryFormatter.Deserialize
+dotnet_diagnostic.CA2302.severity = warning
+
+# CA2305: Do not use insecure deserializer LosFormatter
+dotnet_diagnostic.CA2305.severity = warning
+
+# CA2310: Do not use insecure deserializer NetDataContractSerializer
+dotnet_diagnostic.CA2310.severity = warning
+
+# CA2311: Do not deserialize without first setting NetDataContractSerializer.Binder
+dotnet_diagnostic.CA2311.severity = warning
+
+# CA2312: Ensure NetDataContractSerializer.Binder is set before deserializing
+dotnet_diagnostic.CA2312.severity = warning
+
+# CA2315: Do not use insecure deserializer ObjectStateFormatter
+dotnet_diagnostic.CA2315.severity = warning
+
+# CA2321: Do not deserialize with JavaScriptSerializer using a SimpleTypeResolver
+dotnet_diagnostic.CA2321.severity = warning
+
+# CA2322: Ensure JavaScriptSerializer is not initialized with SimpleTypeResolver before deserializing
+dotnet_diagnostic.CA2322.severity = warning
+
+# CA2326: Do not use TypeNameHandling values other than None
+dotnet_diagnostic.CA2326.severity = warning
+
+# CA2327: Do not use insecure JsonSerializerSettings
+dotnet_diagnostic.CA2327.severity = warning
+
+# CA2328: Ensure that JsonSerializerSettings are secure
+dotnet_diagnostic.CA2328.severity = warning
+
+# CA2329: Do not deserialize with JsonSerializer using an insecure configuration
+dotnet_diagnostic.CA2329.severity = warning
+
+# CA2330: Ensure that JsonSerializer has a secure configuration when deserializing
+dotnet_diagnostic.CA2330.severity = warning
+
+# CA2350: Do not use DataTable.ReadXml() with untrusted data
+dotnet_diagnostic.CA2350.severity = warning
+
+# CA2351: Do not use DataSet.ReadXml() with untrusted data
+dotnet_diagnostic.CA2351.severity = warning
+
+# CA2361: Ensure auto-generated class containing DataSet.ReadXml() is not used with untrusted data
+dotnet_diagnostic.CA2361.severity = warning
+
+# CA3001: Review code for SQL injection vulnerabilities
+dotnet_diagnostic.CA3001.severity = warning
+
+# CA3002: Review code for XSS vulnerabilities
+dotnet_diagnostic.CA3002.severity = warning
+
+# CA3003: Review code for file path injection vulnerabilities
+dotnet_diagnostic.CA3003.severity = warning
+
+# CA3004: Review code for information disclosure vulnerabilities
+dotnet_diagnostic.CA3004.severity = warning
+
+# CA3005: Review code for LDAP injection vulnerabilities
+dotnet_diagnostic.CA3005.severity = warning
+
+# CA3006: Review code for process command injection vulnerabilities
+dotnet_diagnostic.CA3006.severity = warning
+
+# CA3007: Review code for open redirect vulnerabilities
+dotnet_diagnostic.CA3007.severity = warning
+
+# CA3008: Review code for XPath injection vulnerabilities
+dotnet_diagnostic.CA3008.severity = warning
+
+# CA3009: Review code for XML injection vulnerabilities
+dotnet_diagnostic.CA3009.severity = warning
+
+# CA3010: Review code for XAML injection vulnerabilities
+dotnet_diagnostic.CA3010.severity = warning
+
+# CA3011: Review code for DLL injection vulnerabilities
+dotnet_diagnostic.CA3011.severity = warning
+
+# CA3012: Review code for regex injection vulnerabilities
+dotnet_diagnostic.CA3012.severity = warning
+
+# CA3061: Do Not Add Schema By URL
+dotnet_diagnostic.CA3061.severity = warning
+
+# CA3075: Insecure DTD processing in XML
+dotnet_diagnostic.CA3075.severity = warning
+
+# CA3076: Insecure XSLT script processing
+dotnet_diagnostic.CA3076.severity = warning
+
+# CA3077: Insecure Processing in API Design, XmlDocument and XmlTextReader
+dotnet_diagnostic.CA3077.severity = warning
+
+# CA3147: Mark Verb Handlers With Validate Antiforgery Token
+dotnet_diagnostic.CA3147.severity = warning
+
+# CA5350: Do Not Use Weak Cryptographic Algorithms
+dotnet_diagnostic.CA5350.severity = warning
+
+# CA5351: Do Not Use Broken Cryptographic Algorithms
+dotnet_diagnostic.CA5351.severity = warning
+
+# CA5358: Review cipher mode usage with cryptography experts
+dotnet_diagnostic.CA5358.severity = warning
+
+# CA5359: Do Not Disable Certificate Validation
+dotnet_diagnostic.CA5359.severity = warning
+
+# CA5360: Do Not Call Dangerous Methods In Deserialization
+dotnet_diagnostic.CA5360.severity = warning
+
+# CA5361: Do Not Disable SChannel Use of Strong Crypto
+dotnet_diagnostic.CA5361.severity = warning
+
+# CA5362: Potential reference cycle in deserialized object graph
+dotnet_diagnostic.CA5362.severity = warning
+
+# CA5363: Do Not Disable Request Validation
+dotnet_diagnostic.CA5363.severity = warning
+
+# CA5364: Do Not Use Deprecated Security Protocols
+dotnet_diagnostic.CA5364.severity = warning
+
+# CA5365: Do Not Disable HTTP Header Checking
+dotnet_diagnostic.CA5365.severity = warning
+
+# CA5366: Use XmlReader for 'DataSet.ReadXml()'
+dotnet_diagnostic.CA5366.severity = warning
+
+# CA5367: Do Not Serialize Types With Pointer Fields
+dotnet_diagnostic.CA5367.severity = warning
+
+# CA5368: Set ViewStateUserKey For Classes Derived From Page
+dotnet_diagnostic.CA5368.severity = warning
+
+# CA5369: Use XmlReader for 'XmlSerializer.Deserialize()'
+dotnet_diagnostic.CA5369.severity = warning
+
+# CA5370: Use XmlReader for XmlValidatingReader constructor
+dotnet_diagnostic.CA5370.severity = warning
+
+# CA5371: Use XmlReader for 'XmlSchema.Read()'
+dotnet_diagnostic.CA5371.severity = warning
+
+# CA5372: Use XmlReader for XPathDocument constructor
+dotnet_diagnostic.CA5372.severity = warning
+
+# CA5373: Do not use obsolete key derivation function
+dotnet_diagnostic.CA5373.severity = warning
+
+# CA5374: Do Not Use XslTransform
+dotnet_diagnostic.CA5374.severity = warning
+
+# CA5375: Do Not Use Account Shared Access Signature
+dotnet_diagnostic.CA5375.severity = warning
+
+# CA5376: Use SharedAccessProtocol HttpsOnly
+dotnet_diagnostic.CA5376.severity = warning
+
+# CA5377: Use Container Level Access Policy
+dotnet_diagnostic.CA5377.severity = warning
+
+# CA5378: Do not disable ServicePointManagerSecurityProtocols
+dotnet_diagnostic.CA5378.severity = warning
+
+# CA5379: Ensure Key Derivation Function algorithm is sufficiently strong
+dotnet_diagnostic.CA5379.severity = warning
+
+# CA5380: Do Not Add Certificates To Root Store
+dotnet_diagnostic.CA5380.severity = warning
+
+# CA5381: Ensure Certificates Are Not Added To Root Store
+dotnet_diagnostic.CA5381.severity = warning
+
+# CA5382: Use Secure Cookies In ASP.NET Core
+dotnet_diagnostic.CA5382.severity = warning
+
+# CA5383: Ensure Use Secure Cookies In ASP.NET Core
+dotnet_diagnostic.CA5383.severity = warning
+
+# CA5384: Do Not Use Digital Signature Algorithm (DSA)
+dotnet_diagnostic.CA5384.severity = warning
+
+# CA5385: Use Rivest-Shamir-Adleman (RSA) Algorithm With Sufficient Key Size
+dotnet_diagnostic.CA5385.severity = warning
+
+# CA5386: Avoid hardcoding SecurityProtocolType value
+dotnet_diagnostic.CA5386.severity = warning
+
+# CA5387: Do Not Use Weak Key Derivation Function With Insufficient Iteration Count
+dotnet_diagnostic.CA5387.severity = warning
+
+# CA5388: Ensure Sufficient Iteration Count When Using Weak Key Derivation Function
+dotnet_diagnostic.CA5388.severity = warning
+
+# CA5389: Do Not Add Archive Item's Path To The Target File System Path
+dotnet_diagnostic.CA5389.severity = warning
+
+# CA5390: Do not hard-code encryption key
+dotnet_diagnostic.CA5390.severity = warning
+
+# CA5391: Use antiforgery tokens in ASP.NET Core MVC controllers
+dotnet_diagnostic.CA5391.severity = warning
+
+# CA5392: Use DefaultDllImportSearchPaths attribute for P/Invokes
+dotnet_diagnostic.CA5392.severity = warning
+
+# CA5393: Do not use unsafe DllImportSearchPath value
+dotnet_diagnostic.CA5393.severity = warning
+
+# CA5394: Do not use insecure randomness
+dotnet_diagnostic.CA5394.severity = warning
+
+# CA5395: Miss HttpVerb attribute for action methods
+dotnet_diagnostic.CA5395.severity = warning
+
+# CA5396: Set HttpOnly to true for HttpCookie
+dotnet_diagnostic.CA5396.severity = warning
+
+# CA5397: Do not use deprecated SslProtocols values
+dotnet_diagnostic.CA5397.severity = warning
+
+# CA5398: Avoid hardcoded SslProtocols values
+dotnet_diagnostic.CA5398.severity = warning
+
+# CA5399: HttpClients should enable certificate revocation list checks
+dotnet_diagnostic.CA5399.severity = warning
+
+# CA5400: Ensure HttpClient certificate revocation list check is not disabled
+dotnet_diagnostic.CA5400.severity = warning
+
+# CA5401: Do not use CreateEncryptor with non-default IV
+dotnet_diagnostic.CA5401.severity = warning
+
+# CA5402: Use CreateEncryptor with the default IV 
+dotnet_diagnostic.CA5402.severity = warning
+
+# CA5403: Do not hard-code certificate
+dotnet_diagnostic.CA5403.severity = warning
+
+# CA5404: Do not disable token validation checks
+dotnet_diagnostic.CA5404.severity = warning
+
+# CA5405: Do not always skip token validation in delegates
+dotnet_diagnostic.CA5405.severity = warning
+
+# CA1032: Implement standard exception constructors
+dotnet_diagnostic.CA1032.severity = warning
+
+# CA1200: Avoid using cref tags with a prefix
+dotnet_diagnostic.CA1200.severity = warning
+
+# CA1309: Use ordinal string comparison
+dotnet_diagnostic.CA1309.severity = warning
+
+# CA1311: Specify a culture or use an invariant version
+dotnet_diagnostic.CA1311.severity = warning
+
+# CA1507: Use nameof to express symbol names
+dotnet_diagnostic.CA1507.severity = warning
+
+# CA1508: Avoid dead conditional code
+dotnet_diagnostic.CA1508.severity = warning
+
+# CA1802: Use literals where appropriate
+dotnet_diagnostic.CA1802.severity = warning
+
+# CA1805: Do not initialize unnecessarily
+dotnet_diagnostic.CA1805.severity = warning
+
+# CA1812: Avoid uninstantiated internal classes
+dotnet_diagnostic.CA1812.severity = warning
+
+# CA1824: Mark assemblies with NeutralResourcesLanguageAttribute
+dotnet_diagnostic.CA1824.severity = warning
+
+# CA1825: Avoid zero-length array allocations
+dotnet_diagnostic.CA1825.severity = warning
+
+# CA1841: Prefer Dictionary.Contains methods
+dotnet_diagnostic.CA1841.severity = warning
+
+# CA1845: Use span-based 'string.Concat'
+dotnet_diagnostic.CA1845.severity = warning
+
+# CA1851: Possible multiple enumerations of 'IEnumerable' collection
+dotnet_diagnostic.CA1851.severity = warning
+
+# CA1855: Prefer 'Clear' over 'Fill'
+dotnet_diagnostic.CA1855.severity = warning
+
+# CA1856: Incorrect usage of ConstantExpected attribute
+dotnet_diagnostic.CA1856.severity = warning
+
+# CA1857: A constant is expected for the parameter
+dotnet_diagnostic.CA1857.severity = warning
+
+# CA1865: Use char overload
+dotnet_diagnostic.CA1865.severity = warning
+
+# CA1866: Use char overload
+dotnet_diagnostic.CA1866.severity = warning
+
+# CA1867: Use char overload
+dotnet_diagnostic.CA1867.severity = warning
+
+# CA1870: Use a cached 'SearchValues' instance
+dotnet_diagnostic.CA1870.severity = warning
+
+# CA2014: Do not use stackalloc in loops
+dotnet_diagnostic.CA2014.severity = warning
+
+# CA2016: Forward the 'CancellationToken' parameter to methods
+dotnet_diagnostic.CA2016.severity = warning
+
+# CA2020: Prevent behavioral change
+dotnet_diagnostic.CA2020.severity = warning
+
+# CA2234: Pass system uri objects instead of strings
+dotnet_diagnostic.CA2234.severity = warning
+
+# CA2252: This API requires opting into preview features
+dotnet_diagnostic.CA2252.severity = warning
+
+# CA2260: Use correct type parameter
+dotnet_diagnostic.CA2260.severity = warning
+
+# CA2352: Unsafe DataSet or DataTable in serializable type can be vulnerable to remote code execution attacks
+dotnet_diagnostic.CA2352.severity = warning
+
+# CA2353: Unsafe DataSet or DataTable in serializable type
+dotnet_diagnostic.CA2353.severity = warning
+
+# CA2354: Unsafe DataSet or DataTable in deserialized object graph can be vulnerable to remote code execution attacks
+dotnet_diagnostic.CA2354.severity = warning
+
+# CA2355: Unsafe DataSet or DataTable type found in deserializable object graph
+dotnet_diagnostic.CA2355.severity = warning
+
+# CA2356: Unsafe DataSet or DataTable type in web deserializable object graph
+dotnet_diagnostic.CA2356.severity = warning
+
+# CA2362: Unsafe DataSet or DataTable in auto-generated serializable type can be vulnerable to remote code execution attacks
+dotnet_diagnostic.CA2362.severity = warning
--- a/FrostFS.SDK.sln
+++ b/FrostFS.SDK.sln
@ -1,6 +1,8 @@

-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
 VisualStudioVersion = 17.5.002.0
+MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FrostFS.SDK.ClientV2", "src\FrostFS.SDK.ClientV2\FrostFS.SDK.ClientV2.csproj", "{50D8F61F-C302-4AC9-8D8A-AB0B8C0988C3}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FrostFS.SDK.Cryptography", "src\FrostFS.SDK.Cryptography\FrostFS.SDK.Cryptography.csproj", "{3D804F4A-B0B2-47A5-B006-BE447BE64B50}"
@ -9,6 +11,11 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FrostFS.SDK.ProtosV2", "src
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FrostFS.SDK.Tests", "src\FrostFS.SDK.Tests\FrostFS.SDK.Tests.csproj", "{8FDA7E0D-9C75-4874-988E-6592CD28F76C}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{2F030ACD-F87C-4E83-9A68-4CC5DF03AD90}"
+	ProjectSection(SolutionItems) = preProject
+		.editorconfig = .editorconfig
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@ -32,4 +39,7 @@ Global
 		{8FDA7E0D-9C75-4874-988E-6592CD28F76C}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{8FDA7E0D-9C75-4874-988E-6592CD28F76C}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
 EndGlobal
--- a/src/FrostFS.SDK.ClientV2/Exceptions/FrostFsException.cs
+++ b/src/FrostFS.SDK.ClientV2/Exceptions/FrostFsException.cs
@ -0,0 +1,18 @@
+using System;
+
+namespace FrostFS.SDK.ClientV2;
+
+public class FrostFsException : Exception
+{
+    public FrostFsException()
+    {
+    }
+
+    public FrostFsException(string message) : base(message)
+    {
+    }
+
+    public FrostFsException(string message, Exception innerException) : base(message, innerException)
+    {
+    }
+}
--- a/src/FrostFS.SDK.ClientV2/Exceptions/InvalidObjectException.cs
+++ b/src/FrostFS.SDK.ClientV2/Exceptions/InvalidObjectException.cs
@ -2,6 +2,17 @@ using System;

 namespace FrostFS.SDK.ClientV2;

-public class InvalidObjectException() : Exception()
+public class InvalidObjectException : Exception
 {
+    public InvalidObjectException()
+    {
+    }
+
+    public InvalidObjectException(string message) : base(message)
+    {
+    }
+
+    public InvalidObjectException(string message, Exception innerException) : base(message, innerException)
+    {
+    }
 }
--- a/src/FrostFS.SDK.ClientV2/Exceptions/ResponseException.cs
+++ b/src/FrostFS.SDK.ClientV2/Exceptions/ResponseException.cs
@ -2,7 +2,24 @@ using System;

 namespace FrostFS.SDK.ClientV2;

-public class ResponseException(FrostFsResponseStatus status) : Exception()
+public class ResponseException : Exception
 {
-    public FrostFsResponseStatus Status { get; set; } = status;
+    public FrostFsResponseStatus? Status { get; private set; }
+
+    public ResponseException()
+    {
+    }
+
+    public ResponseException(FrostFsResponseStatus status)
+    {
+        Status = status;
+    }
+
+    public ResponseException(string message) : base(message)
+    {
+    }
+
+    public ResponseException(string message, Exception innerException) : base(message, innerException)
+    {
+    }
 }
--- a/src/FrostFS.SDK.ClientV2/FrostFS.SDK.ClientV2.csproj
+++ b/src/FrostFS.SDK.ClientV2/FrostFS.SDK.ClientV2.csproj
@ -4,14 +4,23 @@
    <TargetFramework>netstandard2.0</TargetFramework>
    <LangVersion>12.0</LangVersion>
    <Nullable>enable</Nullable>
+	<AnalysisMode>AllEnabledByDefault</AnalysisMode>
  </PropertyGroup>

-	<PropertyGroup>
-		<EnableNETAnalyzers>true</EnableNETAnalyzers>
-	</PropertyGroup>
+  <PropertyGroup>
+	<EnableNETAnalyzers>true</EnableNETAnalyzers>
+  </PropertyGroup>
+
+  <PropertyGroup>
+	<CodeAnalysisTreatWarningsAsErrors>true</CodeAnalysisTreatWarningsAsErrors>
+  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="8.0.0">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
    <PackageReference Include="Microsoft.Extensions.Caching.Abstractions" Version="8.0.0" />
    <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="8.0.0" />
    <PackageReference Include="Microsoft.Extensions.Options" Version="8.0.2" />
--- a/src/FrostFS.SDK.ClientV2/FrostFSClient.cs
+++ b/src/FrostFS.SDK.ClientV2/FrostFSClient.cs
@ -3,6 +3,9 @@ using System.Collections.Generic;
 using System.Net.Http;
 using System.Threading.Tasks;

+using Frostfs.V2.Ape;
+using Frostfs.V2.Apemanager;
+
 using FrostFS.Container;
 using FrostFS.Netmap;
 using FrostFS.Object;
@ -15,35 +18,33 @@ using Grpc.Core.Interceptors;
 using Grpc.Net.Client;

 using Microsoft.Extensions.Options;
-using Frostfs.V2.Apemanager;
-using Frostfs.V2.Ape;

 namespace FrostFS.SDK.ClientV2;

-public class Client : IFrostFSClient
+public class FrostFSClient : IFrostFSClient
 {
    private bool isDisposed;
-  
+
    internal ContainerService.ContainerServiceClient? ContainerServiceClient { get; set; }
- 
+
    internal NetmapService.NetmapServiceClient? NetmapServiceClient { get; set; }

    internal APEManagerService.APEManagerServiceClient? ApeManagerServiceClient { get; set; }

    internal SessionService.SessionServiceClient? SessionServiceClient { get; set; }
-    
+
    internal ObjectService.ObjectServiceClient? ObjectServiceClient { get; set; }

    internal ClientEnvironment ClientCtx { get; set; }

    public static IFrostFSClient GetInstance(IOptions<ClientSettings> clientOptions, GrpcChannelOptions? channelOptions = null)
    {
-        return new Client(clientOptions, channelOptions);
+        return new FrostFSClient(clientOptions, channelOptions);
    }

    public static IFrostFSClient GetSingleOwnerInstance(IOptions<SingleOwnerClientSettings> clientOptions, GrpcChannelOptions? channelOptions = null)
    {
-        return new Client(clientOptions, channelOptions);
+        return new FrostFSClient(clientOptions, channelOptions);
    }

    /// <summary>
@ -64,10 +65,15 @@ public class Client : IFrostFSClient
        ContainerService.ContainerServiceClient containerService,
        ObjectService.ObjectServiceClient objectService)
    {
-        return new Client(clientOptions, channelOptions, containerService, netmapService, sessionService, objectService);
+        if (clientOptions is null)
+        {
+            throw new ArgumentNullException(nameof(clientOptions));
+        }
+
+        return new FrostFSClient(clientOptions, channelOptions, containerService, netmapService, sessionService, objectService);
    }

-    private Client(
+    private FrostFSClient(
      IOptions<SingleOwnerClientSettings> settings,
      GrpcChannelOptions? channelOptions,
      ContainerService.ContainerServiceClient containerService,
@ -75,6 +81,11 @@ public class Client : IFrostFSClient
      SessionService.SessionServiceClient sessionService,
      ObjectService.ObjectServiceClient objectService)
    {
+        if (settings is null)
+        {
+            throw new ArgumentNullException(nameof(settings));
+        }
+
        var ecdsaKey = settings.Value.Key.LoadWif();
        FrostFsOwner.FromKey(ecdsaKey);

@ -85,13 +96,13 @@ public class Client : IFrostFSClient
           channel: InitGrpcChannel(settings.Value.Host, channelOptions),
           version: new FrostFsVersion(2, 13));

-        ContainerServiceClient = containerService;
-        NetmapServiceClient = netmapService;
-        SessionServiceClient = sessionService;
-        ObjectServiceClient = objectService;
+        ContainerServiceClient = containerService ?? throw new ArgumentNullException(nameof(containerService));
+        NetmapServiceClient = netmapService ?? throw new ArgumentNullException(nameof(netmapService));
+        SessionServiceClient = sessionService ?? throw new ArgumentNullException(nameof(sessionService));
+        ObjectServiceClient = objectService ?? throw new ArgumentNullException(nameof(objectService));
    }

-    private Client(IOptions<ClientSettings> options, GrpcChannelOptions? channelOptions)
+    private FrostFSClient(IOptions<ClientSettings> options, GrpcChannelOptions? channelOptions)
    {
        var clientSettings = (options?.Value) ?? throw new ArgumentException("Options must be initialized");

@ -110,14 +121,14 @@ public class Client : IFrostFSClient
        // CheckFrostFsVersionSupport(new Context { Timeout = TimeSpan.FromSeconds(20) });
    }

-    private Client(IOptions<SingleOwnerClientSettings> options, GrpcChannelOptions? channelOptions)
+    private FrostFSClient(IOptions<SingleOwnerClientSettings> options, GrpcChannelOptions? channelOptions)
    {
        var clientSettings = (options?.Value) ?? throw new ArgumentException("Options must be initialized");

        clientSettings.Validate();

        var ecdsaKey = clientSettings.Key.LoadWif();
-        
+
        var channel = InitGrpcChannel(clientSettings.Host, channelOptions);

        ClientCtx = new ClientEnvironment(
@ -128,7 +139,7 @@ public class Client : IFrostFSClient
            version: new FrostFsVersion(2, 13));

        // TODO: define timeout logic
-        CheckFrostFsVersionSupport(new Context { Timeout = TimeSpan.FromSeconds(20)});
+        // CheckFrostFsVersionSupport(new Context { Timeout = TimeSpan.FromSeconds(20) });
    }

    public void Dispose()
@ -149,18 +160,31 @@ public class Client : IFrostFSClient
    #region ApeManagerImplementation
    public Task<byte[]> AddChainAsync(PrmApeChainAdd args)
    {
+        if (args is null)
+        {
+            throw new ArgumentNullException(nameof(args));
+        }
+
        var service = GetApeManagerService(args);
        return service.AddChainAsync(args);
    }

    public Task RemoveChainAsync(PrmApeChainRemove args)
    {
+        if (args is null)
+        {
+            throw new ArgumentNullException(nameof(args));
+        }
+
        var service = GetApeManagerService(args);
        return service.RemoveChainAsync(args);
    }

    public Task<Chain[]> ListChainAsync(PrmApeChainList args)
    {
+        if (args is null)
+            throw new ArgumentNullException(nameof(args));
+
        var service = GetApeManagerService(args);
        return service.ListChainAsync(args);
    }
@ -169,6 +193,9 @@ public class Client : IFrostFSClient
    #region ContainerImplementation
    public Task<FrostFsContainerInfo> GetContainerAsync(PrmContainerGet args)
    {
+        if (args is null)
+            throw new ArgumentNullException(nameof(args));
+
        var service = GetContainerService(args);
        return service.GetContainerAsync(args);
    }
@ -176,18 +203,24 @@ public class Client : IFrostFSClient
    public IAsyncEnumerable<FrostFsContainerId> ListContainersAsync(PrmContainerGetAll? args = null)
    {
        args ??= new PrmContainerGetAll();
-        var service = GetContainerService(args);      
+        var service = GetContainerService(args);
        return service.ListContainersAsync(args);
    }

    public Task<FrostFsContainerId> CreateContainerAsync(PrmContainerCreate args)
    {
+        if (args is null)
+            throw new ArgumentNullException(nameof(args));
+
        var service = GetContainerService(args);
        return service.CreateContainerAsync(args);
    }

    public Task DeleteContainerAsync(PrmContainerDelete args)
    {
+        if (args is null)
+            throw new ArgumentNullException(nameof(args));
+
        var service = GetContainerService(args);
        return service.DeleteContainerAsync(args);
    }
@ -219,36 +252,54 @@ public class Client : IFrostFSClient
    #region ObjectImplementation
    public Task<FrostFsObjectHeader> GetObjectHeadAsync(PrmObjectHeadGet args)
    {
+        if (args is null)
+            throw new ArgumentNullException(nameof(args));
+
        var service = GetObjectService(args);
        return service.GetObjectHeadAsync(args);
    }

    public Task<FrostFsObject> GetObjectAsync(PrmObjectGet args)
    {
+        if (args is null)
+            throw new ArgumentNullException(nameof(args));
+
        var service = GetObjectService(args);
        return service.GetObjectAsync(args);
    }

    public Task<FrostFsObjectId> PutObjectAsync(PrmObjectPut args)
    {
+        if (args is null)
+            throw new ArgumentNullException(nameof(args));
+
        var service = GetObjectService(args);
        return service.PutObjectAsync(args);
    }

    public Task<FrostFsObjectId> PutSingleObjectAsync(PrmSingleObjectPut args)
    {
+        if (args is null)
+            throw new ArgumentNullException(nameof(args));
+
        var service = GetObjectService(args);
        return service.PutSingleObjectAsync(args);
    }

    public Task DeleteObjectAsync(PrmObjectDelete args)
    {
+        if (args is null)
+            throw new ArgumentNullException(nameof(args));
+
        var service = GetObjectService(args);
        return service.DeleteObjectAsync(args);
    }

    public IAsyncEnumerable<FrostFsObjectId> SearchObjectsAsync(PrmObjectSearch args)
    {
+        if (args is null)
+            throw new ArgumentNullException(nameof(args));
+
        var service = GetObjectService(args);
        return service.SearchObjectsAsync(args);
    }
@ -257,17 +308,23 @@ public class Client : IFrostFSClient
    #region SessionImplementation
    public async Task<FrostFsSessionToken> CreateSessionAsync(PrmSessionCreate args)
    {
-        var session = await CreateSessionInternalAsync(args);
+        if (args is null)
+            throw new ArgumentNullException(nameof(args));
+
+        var session = await CreateSessionInternalAsync(args).ConfigureAwait(false);
        var token = session.Serialize();
-        
+
        return new FrostFsSessionToken(token);
    }

-    internal Task<Session.SessionToken> CreateSessionInternalAsync(PrmSessionCreate args)
+    internal Task<SessionToken> CreateSessionInternalAsync(PrmSessionCreate args)
    {
+        if (args is null)
+            throw new ArgumentNullException(nameof(args));
+
        var service = GetSessionService(args);
        return service.CreateSessionAsync(args);
-    }    
+    }
    #endregion

    #region ToolsImplementation
@ -283,20 +340,24 @@ public class Client : IFrostFSClient
    private async void CheckFrostFsVersionSupport(Context? ctx = default)
    {
        var args = new PrmNodeInfo { Context = ctx };
+
+        if (ctx?.Version == null)
+            throw new InvalidObjectException(nameof(ctx.Version));
+
        var service = GetNetmapService(args);
-        var localNodeInfo = await service.GetLocalNodeInfoAsync(args);
-      
-        if (!localNodeInfo.Version.IsSupported(args.Context!.Version))
+        var localNodeInfo = await service.GetLocalNodeInfoAsync(args).ConfigureAwait(false);
+
+        if (!localNodeInfo.Version.IsSupported(ctx.Version))
        {
            var msg = $"FrostFS {localNodeInfo.Version} is not supported.";
-            throw new ApplicationException(msg);
+            throw new FrostFsException(msg);
        }
    }

    private CallInvoker? SetupEnvironment(IContext ctx)
    {
        if (isDisposed)
-            throw new Exception("Client is disposed.");
+            throw new InvalidObjectException("Client is disposed.");

        ctx.Context ??= new Context();

@ -304,14 +365,14 @@ public class Client : IFrostFSClient
        {
            if (ClientCtx.Key == null)
            {
-                throw new Exception("Key is not initialized.");
+                throw new InvalidObjectException("Key is not initialized.");
            }

            ctx.Context.Key = ClientCtx.Key.ECDsaKey;
        }

        if (ctx.Context.OwnerId == null)
-        { 
+        {
            ctx.Context.OwnerId = ClientCtx.Owner ?? FrostFsOwner.FromKey(ctx.Context.Key);
        }

@ -319,7 +380,7 @@ public class Client : IFrostFSClient
        {
            if (ClientCtx.Version == null)
            {
-                throw new Exception("Version is not initialized.");
+                throw new InvalidObjectException("Version is not initialized.");
            }

            ctx.Context.Version = ClientCtx.Version;
@ -336,7 +397,7 @@ public class Client : IFrostFSClient

        if (ctx.Context.Callback != null)
            callInvoker = AddInvoker(callInvoker, new MetricsInterceptor(ctx.Context.Callback));
-        
+
        return callInvoker;

        CallInvoker AddInvoker(CallInvoker? callInvoker, Interceptor interceptor)
@ -382,7 +443,7 @@ public class Client : IFrostFSClient

    private ContainerServiceProvider GetContainerService(IContext ctx)
    {
-        var callInvoker = SetupEnvironment(ctx);        
+        var callInvoker = SetupEnvironment(ctx);
        var client = ContainerServiceClient ?? (callInvoker != null
            ? new ContainerService.ContainerServiceClient(callInvoker)
            : new ContainerService.ContainerServiceClient(ClientCtx.Channel));
@ -408,7 +469,7 @@ public class Client : IFrostFSClient

            if (channelOptions != null)
                return GrpcChannel.ForAddress(uri, channelOptions);
-            
+
            return GrpcChannel.ForAddress(uri, new GrpcChannelOptions
            {
                HttpHandler = new HttpClientHandler()
--- a/src/FrostFS.SDK.ClientV2/Interceptors/MetricsInterceptor.cs
+++ b/src/FrostFS.SDK.ClientV2/Interceptors/MetricsInterceptor.cs
@ -14,6 +14,11 @@ public class MetricsInterceptor(Action<CallStatistics> callback) : Interceptor
        ClientInterceptorContext<TRequest, TResponse> context,
        AsyncUnaryCallContinuation<TRequest, TResponse> continuation)
    {
+        if (continuation is null)
+        {
+            throw new ArgumentNullException(nameof(continuation));
+        }
+
        var call = continuation(request, context);

        return new AsyncUnaryCall<TResponse>(
@ -28,7 +33,10 @@ public class MetricsInterceptor(Action<CallStatistics> callback) : Interceptor
        ClientInterceptorContext<TRequest, TResponse> context,
        AsyncClientStreamingCallContinuation<TRequest, TResponse> continuation)
    {
-         var call = continuation(context);
+        if (continuation is null)
+            throw new ArgumentNullException(nameof(continuation));
+
+        var call = continuation(context);

        return new AsyncClientStreamingCall<TRequest, TResponse>(
            call.RequestStream,
@ -43,31 +51,31 @@ public class MetricsInterceptor(Action<CallStatistics> callback) : Interceptor
    {
        var watch = new Stopwatch();
        watch.Start();
-      
-        var response = await call.ResponseAsync;
+
+        var response = await call.ResponseAsync.ConfigureAwait(false);

        watch.Stop();

-        var elapsed = watch.ElapsedTicks * 1_000_000/Stopwatch.Frequency;
+        var elapsed = watch.ElapsedTicks * 1_000_000 / Stopwatch.Frequency;

        callback(new CallStatistics { MethodName = call.ToString(), ElapsedMicroSeconds = elapsed });

-        return response;    
+        return response;
    }

    private async Task<TResponse> HandleStreamResponse<TRequest, TResponse>(AsyncClientStreamingCall<TRequest, TResponse> call)
    {
        var watch = new Stopwatch();
        watch.Start();
-      
-        var response = await call.ResponseAsync;
+
+        var response = await call.ResponseAsync.ConfigureAwait(false);

        watch.Stop();

-        var elapsed = watch.ElapsedTicks * 1_000_000/Stopwatch.Frequency;
+        var elapsed = watch.ElapsedTicks * 1_000_000 / Stopwatch.Frequency;

        callback(new CallStatistics { MethodName = call.ToString(), ElapsedMicroSeconds = elapsed });

-        return response;    
+        return response;
    }
 }
--- a/src/FrostFS.SDK.ClientV2/Interfaces/IFrostFSClient.cs
+++ b/src/FrostFS.SDK.ClientV2/Interfaces/IFrostFSClient.cs
@ -36,21 +36,21 @@ public interface IFrostFSClient : IDisposable

    Task DeleteContainerAsync(PrmContainerDelete args);
    #endregion
-    
+
    #region Object
    Task<FrostFsObjectHeader> GetObjectHeadAsync(PrmObjectHeadGet args);

    Task<FrostFsObject> GetObjectAsync(PrmObjectGet args);

    Task<FrostFsObjectId> PutObjectAsync(PrmObjectPut args);
-    
+
    Task<FrostFsObjectId> PutSingleObjectAsync(PrmSingleObjectPut args);

    Task DeleteObjectAsync(PrmObjectDelete args);

    IAsyncEnumerable<FrostFsObjectId> SearchObjectsAsync(PrmObjectSearch args);
    #endregion
-    
+
    #region Tools
    FrostFsObjectId CalculateObjectId(FrostFsObjectHeader header, Context ctx);
    #endregion
--- a/src/FrostFS.SDK.ClientV2/Mappers/Container.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/Container.cs
@ -9,14 +9,12 @@ public static class ContainerMapper
 {
    public static FrostFsContainerInfo ToModel(this Container.Container container)
    {
-        if (!Enum.IsDefined(typeof(BasicAcl),(int)container.BasicAcl))
-            throw new ArgumentException($"Unknown BasicACL rule. Value: '{container.BasicAcl}'.");
-        
-        BasicAcl acl = (BasicAcl)container.BasicAcl;
+        if (container == null)
+            throw new ArgumentNullException(nameof(container));

-        return new FrostFsContainerInfo(acl,
+        return new FrostFsContainerInfo(
            container.PlacementPolicy.ToModel(),
-            container.Attributes?.Select(a => new FrostFsAttribute(a.Key, a.Value)).ToList(),
+            container.Attributes?.Select(a => new FrostFsAttributePair(a.Key, a.Value)).ToArray(),
            container.Version?.ToModel(),
            container.OwnerId?.ToModel(),
            container.Nonce?.ToUuid());
--- a/src/FrostFS.SDK.ClientV2/Mappers/ContainerId.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/ContainerId.cs
@ -17,19 +17,23 @@ public static class ContainerIdMapper

    public static ContainerID ToMessage(this FrostFsContainerId model)
    {
-        if (model.Value == null)
+        if (model is null)
+        {
            throw new ArgumentNullException(nameof(model));
-        
-        if (!Cache.Containers.TryGetValue(model.Value, out ContainerID? message))
+        }
+
+        var containerId = model.GetValue() ?? throw new ArgumentNullException(nameof(model));
+
+        if (!Cache.Containers.TryGetValue(containerId, out ContainerID? message))
        {
            message = new ContainerID
            {
-                Value = ByteString.CopyFrom(Base58.Decode(model.Value))
+                Value = ByteString.CopyFrom(Base58.Decode(containerId))
            };

-            Cache.Containers.Set(model.Value, message, _oneHourExpiration);
+            Cache.Containers.Set(containerId, message, _oneHourExpiration);
        }

-        return message!;        
+        return message!;
    }
 }
--- a/src/FrostFS.SDK.ClientV2/Mappers/MetaHeader.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/MetaHeader.cs
@ -1,3 +1,5 @@
+using System;
+
 using FrostFS.Session;

 namespace FrostFS.SDK.ClientV2.Mappers.GRPC;
@ -6,11 +8,16 @@ public static class MetaHeaderMapper
 {
    public static RequestMetaHeader ToMessage(this MetaHeader metaHeader)
    {
+        if (metaHeader is null)
+        {
+            throw new ArgumentNullException(nameof(metaHeader));
+        }
+
        return new RequestMetaHeader
        {
            Version = metaHeader.Version.ToMessage(),
            Epoch = (uint)metaHeader.Epoch,
            Ttl = (uint)metaHeader.Ttl
        };
-    }  
+    }
 }
--- a/src/FrostFS.SDK.ClientV2/Mappers/Netmap/Netmap.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/Netmap/Netmap.cs
@ -1,3 +1,4 @@
+using System;
 using System.Linq;

 using FrostFS.Netmap;
@ -8,6 +9,11 @@ public static class NetmapMapper
 {
    public static FrostFsNetmapSnapshot ToModel(this NetmapSnapshotResponse netmap)
    {
+        if (netmap is null)
+        {
+            throw new ArgumentNullException(nameof(netmap));
+        }
+
        return new FrostFsNetmapSnapshot(
            netmap.Body.Netmap.Epoch,
            netmap.Body.Netmap.Nodes
--- a/src/FrostFS.SDK.ClientV2/Mappers/Netmap/NodeInfo.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/Netmap/NodeInfo.cs
@ -10,11 +10,21 @@ public static class NodeInfoMapper
 {
    public static FrostFsNodeInfo ToModel(this LocalNodeInfoResponse.Types.Body node)
    {
+        if (node is null)
+        {
+            throw new ArgumentNullException(nameof(node));
+        }
+
        return node.NodeInfo.ToModel(node.Version);
    }

    public static FrostFsNodeInfo ToModel(this NodeInfo nodeInfo, Refs.Version version)
    {
+        if (nodeInfo is null)
+        {
+            throw new ArgumentNullException(nameof(nodeInfo));
+        }
+
        NodeState state = nodeInfo.State switch
        {
            NodeInfo.Types.State.Unspecified => NodeState.Unspecified,
--- a/src/FrostFS.SDK.ClientV2/Mappers/Netmap/PlacementPolicy.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/Netmap/PlacementPolicy.cs
@ -1,3 +1,4 @@
+using System;
 using System.Linq;

 using FrostFS.Netmap;
@ -6,26 +7,13 @@ namespace FrostFS.SDK.ClientV2;

 public static class PlacementPolicyMapper
 {
-    public static PlacementPolicy ToMessage(this FrostFsPlacementPolicy placementPolicy)
-    {
-        var pp = new PlacementPolicy
-        {
-            Filters = { },
-            Selectors = { },
-            Replicas = { },
-            Unique = placementPolicy.Unique
-        };
-
-        foreach (var replica in placementPolicy.Replicas)
-        {
-            pp.Replicas.Add(replica.ToMessage());
-        }
-
-        return pp;
-    }
-
    public static FrostFsPlacementPolicy ToModel(this PlacementPolicy placementPolicy)
    {
+        if (placementPolicy is null)
+        {
+            throw new ArgumentNullException(nameof(placementPolicy));
+        }
+
        return new FrostFsPlacementPolicy(
            placementPolicy.Unique,
            placementPolicy.Replicas.Select(replica => replica.ToModel()).ToArray()
--- a/src/FrostFS.SDK.ClientV2/Mappers/Netmap/Replica.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/Netmap/Replica.cs
@ -1,3 +1,5 @@
+using System;
+
 using FrostFS.Netmap;

 namespace FrostFS.SDK.ClientV2;
@ -15,6 +17,11 @@ public static class ReplicaMapper

    public static FrostFsReplica ToModel(this Replica replica)
    {
+        if (replica is null)
+        {
+            throw new ArgumentNullException(nameof(replica));
+        }
+
        return new FrostFsReplica((int)replica.Count, replica.Selector);
    }
 }
--- a/src/FrostFS.SDK.ClientV2/Mappers/Object/Object.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/Object/Object.cs
@ -8,5 +8,5 @@ internal static class ObjectMapper
        {
            ObjectId = FrostFsObjectId.FromHash(obj.ObjectId.Value.ToByteArray())
        };
-    }    
+    }
 }
--- a/src/FrostFS.SDK.ClientV2/Mappers/Object/ObjectAttributeMapper.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/Object/ObjectAttributeMapper.cs
@ -1,11 +1,18 @@
+using System;
+
 using FrostFS.Object;

 namespace FrostFS.SDK.ClientV2.Mappers.GRPC;

 public static class ObjectAttributeMapper
 {
-    public static Header.Types.Attribute ToMessage(this FrostFsAttribute attribute)
+    public static Header.Types.Attribute ToMessage(this FrostFsAttributePair attribute)
    {
+        if (attribute is null)
+        {
+            throw new ArgumentNullException(nameof(attribute));
+        }
+
        return new Header.Types.Attribute
        {
            Key = attribute.Key,
@ -13,8 +20,13 @@ public static class ObjectAttributeMapper
        };
    }

-    public static FrostFsAttribute ToModel(this Header.Types.Attribute attribute)
+    public static FrostFsAttributePair ToModel(this Header.Types.Attribute attribute)
    {
-        return new FrostFsAttribute(attribute.Key, attribute.Value);
+        if (attribute is null)
+        {
+            throw new ArgumentNullException(nameof(attribute));
+        }
+
+        return new FrostFsAttributePair(attribute.Key, attribute.Value);
    }
 }
--- a/src/FrostFS.SDK.ClientV2/Mappers/Object/ObjectFilterMapper.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/Object/ObjectFilterMapper.cs
@ -8,6 +8,11 @@ public static class ObjectFilterMapper
 {
    public static SearchRequest.Types.Body.Types.Filter ToMessage(this IObjectFilter filter)
    {
+        if (filter is null)
+        {
+            throw new ArgumentNullException(nameof(filter));
+        }
+
        var objMatchTypeName = filter.MatchType switch
        {
            FrostFsMatchType.Unspecified => MatchType.Unspecified,
@ -25,5 +30,5 @@ public static class ObjectFilterMapper
            Key = filter.Key,
            Value = filter.GetSerializedValue()
        };
-    }    
+    }
 }
--- a/src/FrostFS.SDK.ClientV2/Mappers/Object/ObjectHeaderMapper.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/Object/ObjectHeaderMapper.cs
@ -1,4 +1,5 @@
 using System;
+using System.Collections.ObjectModel;
 using System.Linq;

 using FrostFS.Object;
@ -10,6 +11,11 @@ public static class ObjectHeaderMapper
 {
    public static FrostFsObjectHeader ToModel(this Header header)
    {
+        if (header is null)
+        {
+            throw new ArgumentNullException(nameof(header));
+        }
+
        var objTypeName = header.ObjectType switch
        {
            ObjectType.Regular => FrostFsObjectType.Regular,
@ -22,15 +28,15 @@ public static class ObjectHeaderMapper

        if (header.Split != null)
        {
-            split = new FrostFsSplit(new SplitId(header.Split.SplitId.ToUuid()))
-            {
-                Parent = header.Split.Parent?.ToModel(),
-                ParentHeader = header.Split.ParentHeader?.ToModel(),
-                Previous = header.Split.Previous?.ToModel()
-            };
+            var children = header.Split.Children.Count != 0 ? new ReadOnlyCollection<FrostFsObjectId>(
+                    header.Split.Children.Select(x => x.ToModel()).ToList()) : null;

-            if (header.Split.Children.Count != 0)
-                split.Children.AddRange(header.Split.Children.Select(x => x.ToModel()));
+            split = new FrostFsSplit(new SplitId(header.Split.SplitId.ToUuid()),
+                header.Split.Previous?.ToModel(),
+                header.Split.Parent?.ToModel(),
+                header.Split.ParentHeader?.ToModel(),
+                null,
+                children);
        }

        var model = new FrostFsObjectHeader(
@ -40,10 +46,10 @@ public static class ObjectHeaderMapper
            split,
            header.OwnerId.ToModel(),
            header.Version.ToModel())
-        { 
+        {
            PayloadLength = header.PayloadLength,
        };

        return model;
-    }   
+    }
 }
--- a/src/FrostFS.SDK.ClientV2/Mappers/Object/ObjectId.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/Object/ObjectId.cs
@ -1,3 +1,5 @@
+using System;
+
 using FrostFS.Refs;

 using Google.Protobuf;
@ -8,6 +10,11 @@ public static class ObjectIdMapper
 {
    public static ObjectID ToMessage(this FrostFsObjectId objectId)
    {
+        if (objectId is null)
+        {
+            throw new ArgumentNullException(nameof(objectId));
+        }
+
        return new ObjectID
        {
            Value = ByteString.CopyFrom(objectId.ToHash())
@ -16,6 +23,11 @@ public static class ObjectIdMapper

    public static FrostFsObjectId ToModel(this ObjectID objectId)
    {
+        if (objectId is null)
+        {
+            throw new ArgumentNullException(nameof(objectId));
+        }
+
        return FrostFsObjectId.FromHash(objectId.Value.ToByteArray());
    }
 }
--- a/src/FrostFS.SDK.ClientV2/Mappers/OwnerId.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/OwnerId.cs
@ -17,6 +17,11 @@ public static class OwnerIdMapper

    public static OwnerID ToMessage(this FrostFsOwner model)
    {
+        if (model is null)
+        {
+            throw new ArgumentNullException(nameof(model));
+        }
+
        if (!Cache.Owners.TryGetValue(model, out OwnerID? message))
        {
            message = new OwnerID
@ -32,10 +37,15 @@ public static class OwnerIdMapper

    public static FrostFsOwner ToModel(this OwnerID message)
    {
+        if (message is null)
+        {
+            throw new ArgumentNullException(nameof(message));
+        }
+
        if (!Cache.Owners.TryGetValue(message, out FrostFsOwner? model))
        {
            model = new FrostFsOwner(Base58.Encode(message.Value.ToByteArray()));
-         
+
            Cache.Owners.Set(message, model, _oneHourExpiration);
        }

--- a/src/FrostFS.SDK.ClientV2/Mappers/Session/SessionMapper.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/Session/SessionMapper.cs
@ -1,3 +1,5 @@
+using System;
+
 using Google.Protobuf;

 namespace FrostFS.SDK.ClientV2;
@ -6,8 +8,13 @@ public static class SessionMapper
 {
    public static byte[] Serialize(this Session.SessionToken token)
    {
+        if (token is null)
+        {
+            throw new ArgumentNullException(nameof(token));
+        }
+
        byte[] bytes = new byte[token.CalculateSize()];
-        CodedOutputStream stream = new(bytes);
+        using CodedOutputStream stream = new(bytes);
        token.WriteTo(stream);

        return bytes;
--- a/src/FrostFS.SDK.ClientV2/Mappers/SignatureMapper.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/SignatureMapper.cs
@ -8,13 +8,17 @@ public static class SignatureMapper
 {
    public static Refs.Signature ToMessage(this FrostFsSignature signature)
    {
+        if (signature is null)
+        {
+            throw new ArgumentNullException(nameof(signature));
+        }
+
        var scheme = signature.Scheme switch
        {
            SignatureScheme.EcdsaRfc6979Sha256 => Refs.SignatureScheme.EcdsaRfc6979Sha256,
            SignatureScheme.EcdsaRfc6979Sha256WalletConnect => Refs.SignatureScheme.EcdsaRfc6979Sha256WalletConnect,
            SignatureScheme.EcdsaSha512 => Refs.SignatureScheme.EcdsaSha512,
-            _ => throw new ArgumentException(message: $"Unexpected enum value: {signature.Scheme}",
-                                             paramName: nameof(signature.Scheme))
+            _ => throw new ArgumentException(nameof(signature.Scheme), $"Unexpected enum value: {signature.Scheme}")
        };

        return new Refs.Signature
--- a/src/FrostFS.SDK.ClientV2/Mappers/Status.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/Status.cs
@ -6,7 +6,7 @@ public static class StatusMapper
 {
    public static FrostFsResponseStatus ToModel(this Status.Status status)
    {
-        if (status is null) 
+        if (status is null)
            return new FrostFsResponseStatus(FrostFsStatusCode.Success);

        var codeName = Enum.GetName(typeof(FrostFsStatusCode), status.Code);
--- a/src/FrostFS.SDK.ClientV2/Mappers/Version.cs
+++ b/src/FrostFS.SDK.ClientV2/Mappers/Version.cs
@ -9,10 +9,15 @@ public static class VersionMapper
 {
    private static readonly Hashtable _cacheMessages = [];
    private static readonly Hashtable _cacheModels = [];
-    private static SpinLock _spinlock = new();
+    private static SpinLock _spinlock;

    public static Version ToMessage(this FrostFsVersion model)
    {
+        if (model is null)
+        {
+            throw new System.ArgumentNullException(nameof(model));
+        }
+
        var key = model.Major << 16 + model.Minor;

        if (!_cacheMessages.ContainsKey(key))
@ -46,6 +51,11 @@ public static class VersionMapper

    public static FrostFsVersion ToModel(this Version message)
    {
+        if (message is null)
+        {
+            throw new System.ArgumentNullException(nameof(message));
+        }
+
        var key = (int)message.Major << 16 + (int)message.Minor;

        if (!_cacheModels.ContainsKey(key))
--- a/src/FrostFS.SDK.ClientV2/Models/Chain/ChainTarget.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Chain/ChainTarget.cs
@ -4,7 +4,7 @@ using Frostfs.V2.Ape;

 namespace FrostFS.SDK.ClientV2
 {
-    public struct FrostFsChainTarget(FrostFsTargetType type, string name)
+    public struct FrostFsChainTarget(FrostFsTargetType type, string name) : IEquatable<FrostFsChainTarget>
    {
        private ChainTarget? chainTarget;

@ -33,5 +33,31 @@ namespace FrostFS.SDK.ClientV2
                _ => throw new ArgumentException("Unexpected value for TargetType", nameof(type)),
            };
        }
+
+        public override readonly bool Equals(object obj)
+        {
+            var target = (FrostFsChainTarget)obj;
+            return Equals(target);
+        }
+
+        public override readonly int GetHashCode()
+        {
+            return $"{Name}{Type}".GetHashCode();
+        }
+
+        public static bool operator ==(FrostFsChainTarget left, FrostFsChainTarget right)
+        {
+            return left.Equals(right);
+        }
+
+        public static bool operator !=(FrostFsChainTarget left, FrostFsChainTarget right)
+        {
+            return !(left == right);
+        }
+
+        public readonly bool Equals(FrostFsChainTarget other)
+        {
+            return Type == other.Type && Name.Equals(other.Name, StringComparison.Ordinal);
+        }
    }
 }
--- a/src/FrostFS.SDK.ClientV2/Models/Chain/FrostFsChain.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Chain/FrostFsChain.cs
@ -2,7 +2,7 @@

 namespace FrostFS.SDK.ClientV2
 {
-    public struct FrostFsChain (byte[] raw)
+    public struct FrostFsChain(byte[] raw) : System.IEquatable<FrostFsChain>
    {
        private ByteString? grpcRaw;

@ -12,5 +12,31 @@ namespace FrostFS.SDK.ClientV2
        {
            return grpcRaw ??= ByteString.CopyFrom(Raw);
        }
+
+        public override readonly bool Equals(object obj)
+        {
+            var chain = (FrostFsChain)obj;
+            return Equals(chain);
+        }
+
+        public override readonly int GetHashCode()
+        {
+            return Raw.GetHashCode();
+        }
+
+        public static bool operator ==(FrostFsChain left, FrostFsChain right)
+        {
+            return left.Equals(right);
+        }
+
+        public static bool operator !=(FrostFsChain left, FrostFsChain right)
+        {
+            return !(left == right);
+        }
+
+        public readonly bool Equals(FrostFsChain other)
+        {
+            return Raw == other.Raw;
+        }
    }
 }
--- a/src/FrostFS.SDK.ClientV2/Models/Chain/FrostFsTargetType.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Chain/FrostFsTargetType.cs
@ -1,6 +1,6 @@
 namespace FrostFS.SDK.ClientV2
 {
-    public enum FrostFsTargetType 
+    public enum FrostFsTargetType
    {
        Undefined = 0,
        Namespace,
--- a/src/FrostFS.SDK.ClientV2/Models/Client/ClientSettings.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Client/ClientSettings.cs
@ -1,5 +1,6 @@
 using System;
-using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Globalization;
 using System.Text;

 namespace FrostFS.SDK;
@ -17,18 +18,24 @@ public class ClientSettings
            ThrowException(errors);
    }

-    protected List<string>? CheckFields()
+    protected Collection<string>? CheckFields()
    {
-        List<string>? errors = null;
-
        if (string.IsNullOrWhiteSpace(Host))
-            (errors ??= []).Add(string.Format(errorTemplate, nameof(Host)));
+        {
+            var error = string.Format(CultureInfo.InvariantCulture, errorTemplate, nameof(Host));
+            return new Collection<string>([error]);
+        }

-        return errors;
+        return null;
    }

-    protected static void ThrowException(List<string> errors)
+    protected static void ThrowException(Collection<string> errors)
    {
+        if (errors is null)
+        {
+            throw new ArgumentNullException(nameof(errors));
+        }
+
        StringBuilder messages = new();

        foreach (var error in errors)
@ -51,12 +58,12 @@ public class SingleOwnerClientSettings : ClientSettings
            ThrowException(errors);
    }

-    protected new List<string>? CheckFields()
+    protected new Collection<string>? CheckFields()
    {
-        List<string>? errors = base.CheckFields();
+        Collection<string>? errors = base.CheckFields();

        if (string.IsNullOrWhiteSpace(Key))
-            (errors ??= []).Add(string.Format(errorTemplate, nameof(Key)));
+            (errors ??= []).Add(string.Format(CultureInfo.InvariantCulture, errorTemplate, nameof(Key)));

        return errors;
    }
--- a/src/FrostFS.SDK.ClientV2/Models/Containers/FrostFsContainerId.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Containers/FrostFsContainerId.cs
@ -1,8 +1,7 @@
 using FrostFS.Refs;
-using FrostFS.SDK.Cryptography;
-
-using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.ClientV2;
+using FrostFS.SDK.ClientV2.Mappers.GRPC;
+using FrostFS.SDK.Cryptography;

 namespace FrostFS.SDK;

@ -21,21 +20,18 @@ public class FrostFsContainerId
        this.containerID = id;
    }

-    public string Value
+    public string GetValue()
    {
-        get
+        if (this.modelId != null)
+            return this.modelId;
+
+        if (containerID != null)
        {
-            if (this.modelId != null)
-                return this.modelId;
-
-            if (containerID != null)
-            {
-                this.modelId = Base58.Encode(containerID.Value.ToByteArray());
-                return this.modelId;
-            }
-
-            throw new InvalidObjectException();
+            this.modelId = Base58.Encode(containerID.Value.ToByteArray());
+            return this.modelId;
        }
+
+        throw new InvalidObjectException();
    }

    internal ContainerID ContainerID
@ -57,6 +53,6 @@ public class FrostFsContainerId

    public override string ToString()
    {
-        return Value;
+        return GetValue();
    }
 }
--- a/src/FrostFS.SDK.ClientV2/Models/Containers/FrostFsContainerInfo.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Containers/FrostFsContainerInfo.cs
@ -1,10 +1,10 @@
 using System;
-using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Linq;

 using FrostFS.SDK.ClientV2;
-using FrostFS.SDK.Cryptography;
 using FrostFS.SDK.ClientV2.Mappers.GRPC;
+using FrostFS.SDK.Cryptography;

 using Google.Protobuf;

@ -12,61 +12,59 @@ namespace FrostFS.SDK;

 public class FrostFsContainerInfo
 {
-    private FrostFS.Container.Container.Types.Attribute[]? grpsAttributes;
-    private List<FrostFsAttribute>? attributes;
+    private Container.Container.Types.Attribute[]? grpsAttributes;
+    private ReadOnlyCollection<FrostFsAttributePair>? attributes;
    private FrostFsPlacementPolicy? placementPolicy;
    private Guid? nonce;

-    private Container.Container container;
+    private Container.Container? container;

    public FrostFsContainerInfo(
-        BasicAcl basicAcl, 
        FrostFsPlacementPolicy placementPolicy,
-        List<FrostFsAttribute>? attributes = null,
+        FrostFsAttributePair[]? attributes = null,
        FrostFsVersion? version = null,
        FrostFsOwner? owner = null,
        Guid? nonce = null)
    {
-        BasicAcl = basicAcl;
        this.placementPolicy = placementPolicy;
-        this.attributes = attributes;
        Version = version;
        Owner = owner;
        this.nonce = nonce;
+
+        if (attributes != null)
+            this.attributes = new ReadOnlyCollection<FrostFsAttributePair>(attributes);
    }

    internal FrostFsContainerInfo(Container.Container container)
    {
        this.container = container;
    }
-   
-    public Guid Nonce 
+
+    public Guid Nonce
    {
        get
        {
            nonce ??= container?.Nonce != null ? container.Nonce.ToUuid() : Guid.NewGuid();
            return nonce.Value;
        }
-    } 
-
-    public BasicAcl BasicAcl { get; private set; }
+    }

    public FrostFsPlacementPolicy? PlacementPolicy
    {
        get
        {
-            placementPolicy ??= container.PlacementPolicy?.ToModel();
+            placementPolicy ??= container?.PlacementPolicy?.ToModel();
            return placementPolicy;
        }
    }

-    public List<FrostFsAttribute>? Attributes 
+    public ReadOnlyCollection<FrostFsAttributePair>? Attributes
    {
        get
        {
            if (attributes == null && grpsAttributes != null)
-                attributes = grpsAttributes.Select(a => new FrostFsAttribute(a.Key, a.Value)).ToList();
-            
+                attributes = new ReadOnlyCollection<FrostFsAttributePair>(grpsAttributes.Select(a => new FrostFsAttributePair(a.Key, a.Value)).ToList());
+
            return attributes;
        }
    }
@ -74,8 +72,8 @@ public class FrostFsContainerInfo
    public FrostFsVersion? Version { get; private set; }

    public FrostFsOwner? Owner { get; private set; }
-    
-    internal Container.Container.Types.Attribute[]? GetGrpsAttributes() 
+
+    internal Container.Container.Types.Attribute[]? GetGrpsAttributes()
    {
        grpsAttributes ??= Attributes?
            .Select(a => new Container.Container.Types.Attribute { Key = a.Key, Value = a.Value })
@ -88,10 +86,14 @@ public class FrostFsContainerInfo
    {
        if (this.container == null)
        {
+            if (PlacementPolicy == null)
+            {
+                throw new InvalidObjectException("PlacementPolicy is null");
+            }
+
            this.container = new Container.Container()
            {
-                BasicAcl = (uint)BasicAcl,
-                PlacementPolicy = PlacementPolicy.ToMessage(),
+                PlacementPolicy = PlacementPolicy.Value.GetPolicy(),
                Nonce = ByteString.CopyFrom(Nonce.ToBytes()),
                OwnerId = Owner?.OwnerID,
                Version = Version?.Version
--- a/src/FrostFS.SDK.ClientV2/Models/Enums/BasicAcl.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Enums/BasicAcl.cs
@ -1,21 +0,0 @@
-using System.ComponentModel;
-
-namespace FrostFS.SDK;
-
-public enum BasicAcl
-{
-    [Description("Not defined ACL")] 
-    NotDefined = 0x00000000,
-
-    [Description("Basic ACL for private container")]
-    Private = 0x1C8C8CCC,
-
-    [Description("Basic ACL for public RO container")]
-    PublicRO = 0x1FBF8CFF,
-
-    [Description("Basic ACL for public RW container")]
-    PublicRW = 0x1FBFBFFF,
-
-    [Description("Basic ACL for public append container")]
-    PublicAppend = 0x1FBF9FFF,
-}
--- a/src/FrostFS.SDK.ClientV2/Models/Misc/CheckSum.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Misc/CheckSum.cs
@ -1,20 +1,21 @@
-using FrostFS.SDK.Cryptography;
 using System;

+using FrostFS.SDK.Cryptography;
+
 namespace FrostFS.SDK;

 public class CheckSum
 {
-    // type is always Sha256
-    public byte[]? Hash { get; set; } 
+    private byte[]? hash;
+    private string? text;

    public static CheckSum CreateCheckSum(byte[] content)
    {
-        return new CheckSum { Hash = content.Sha256() };
+        return new CheckSum { hash = content.Sha256() };
    }

    public override string ToString()
    {
-        return BitConverter.ToString(Hash).Replace("-", "");
+        return text ??= BitConverter.ToString(hash).Replace("-", "");
    }
 }
--- a/src/FrostFS.SDK.ClientV2/Models/Misc/Constants.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Misc/Constants.cs
@ -1,8 +1,8 @@
 namespace FrostFS.SDK;

-public class Constants
+public static class Constants
 {
-    public const int ObjectChunkSize = 3 * (1 << 20); 
+    public const int ObjectChunkSize = 3 * (1 << 20);
    public const int Sha256HashLength = 32;

    // HeaderPrefix is a prefix of key to object header value or property.
--- a/src/FrostFS.SDK.ClientV2/Models/Netmap/FrostFsPlacementPolicy.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Netmap/FrostFsPlacementPolicy.cs
@ -1,28 +1,89 @@
+
 using System;
 using System.Linq;

+using FrostFS.Netmap;
+using FrostFS.SDK.ClientV2;
+
 namespace FrostFS.SDK;

-public class FrostFsPlacementPolicy(bool unique, params FrostFsReplica[] replicas) : IComparable<FrostFsPlacementPolicy>
+public struct FrostFsPlacementPolicy(bool unique, params FrostFsReplica[] replicas)
+    : IEquatable<FrostFsPlacementPolicy>
 {
+    private PlacementPolicy policy;
+
    public FrostFsReplica[] Replicas { get; private set; } = replicas;
    public bool Unique { get; private set; } = unique;

-    public int CompareTo(FrostFsPlacementPolicy other)
+    public override readonly bool Equals(object obj)
    {
-        var notEqual = other == null
-            || Unique != other.Unique
-            || Replicas.Length != other.Replicas.Length;
+        if (obj is null)
+            return false;
+
+        var other = (FrostFsPlacementPolicy)obj;
+
+        return Equals(other);
+    }
+
+    public PlacementPolicy GetPolicy()
+    {
+        if (policy == null)
+        {
+            policy = new PlacementPolicy
+            {
+                Filters = { },
+                Selectors = { },
+                Replicas = { },
+                Unique = Unique
+            };
+
+            foreach (var replica in Replicas)
+            {
+                policy.Replicas.Add(replica.ToMessage());
+            }
+        }
+
+        return policy;
+    }
+
+    //public static FrostFsPlacementPolicy ToModel(placementPolicy)
+    //{
+    //    return new FrostFsPlacementPolicy(
+    //        placementPolicy.Unique,
+    //        placementPolicy.Replicas.Select(replica => replica.ToModel()).ToArray()
+    //    );
+    //}
+
+
+    public override readonly int GetHashCode()
+    {
+        return Unique ? 17 : 0 + Replicas.GetHashCode();
+    }
+
+    public static bool operator ==(FrostFsPlacementPolicy left, FrostFsPlacementPolicy right)
+    {
+        return left.Equals(right);
+    }
+
+    public static bool operator !=(FrostFsPlacementPolicy left, FrostFsPlacementPolicy right)
+    {
+        return !(left == right);
+    }
+
+    public readonly bool Equals(FrostFsPlacementPolicy other)
+    {
+        var notEqual = Unique != other.Unique
+         || Replicas.Length != other.Replicas.Length;

        if (notEqual)
-            return 1;
+            return false;

        foreach (var replica in Replicas)
        {
-            if (!other!.Replicas.Any(r => r.Count == replica.Count && r.Selector == replica.Selector))
-                return 1;
+            if (!other.Replicas.Any(r => r.Equals(replica)))
+                return false;
        }

-        return 0;
+        return true;
    }
 }
--- a/src/FrostFS.SDK.ClientV2/Models/Netmap/FrostFsReplica.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Netmap/FrostFsReplica.cs
@ -1,6 +1,8 @@
+using System;
+
 namespace FrostFS.SDK;

-public class FrostFsReplica
+public struct FrostFsReplica : IEquatable<FrostFsReplica>
 {
    public int Count { get; set; }
    public string Selector { get; set; }
@ -12,4 +14,34 @@ public class FrostFsReplica
        Count = count;
        Selector = selector;
    }
+
+    public override readonly bool Equals(object obj)
+    {
+        if (obj is null)
+            return false;
+
+        var other = (FrostFsReplica)obj;
+
+        return Count == other.Count && Selector == other.Selector;
+    }
+
+    public override readonly int GetHashCode()
+    {
+        return Count + Selector.GetHashCode();
+    }
+
+    public static bool operator ==(FrostFsReplica left, FrostFsReplica right)
+    {
+        return left.Equals(right);
+    }
+
+    public static bool operator !=(FrostFsReplica left, FrostFsReplica right)
+    {
+        return !(left == right);
+    }
+
+    public readonly bool Equals(FrostFsReplica other)
+    {
+        return Count == other.Count && Selector == other.Selector;
+    }
 }
--- a/src/FrostFS.SDK.ClientV2/Models/Netmap/FrostFsVersion.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Netmap/FrostFsVersion.cs
@ -5,7 +5,7 @@ namespace FrostFS.SDK;

 public class FrostFsVersion(int major, int minor)
 {
-    public Version version;
+    private Version? version;

    public int Major { get; set; } = major;
    public int Minor { get; set; } = minor;
@ -21,6 +21,11 @@ public class FrostFsVersion(int major, int minor)

    public bool IsSupported(FrostFsVersion version)
    {
+        if (version is null)
+        {
+            throw new System.ArgumentNullException(nameof(version));
+        }
+
        return Major == version.Major;
    }

--- a/src/FrostFS.SDK.ClientV2/Models/Object/FrostFsAttributePair.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Object/FrostFsAttributePair.cs
@ -1,6 +1,6 @@
 namespace FrostFS.SDK;

-public class FrostFsAttribute(string key, string value)
+public class FrostFsAttributePair(string key, string value)
 {
    public string Key { get; set; } = key;

--- a/src/FrostFS.SDK.ClientV2/Models/Object/FrostFsLinkObject.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Object/FrostFsLinkObject.cs
@ -1,13 +1,21 @@
-namespace FrostFS.SDK;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+
+namespace FrostFS.SDK;

 public class FrostFsLinkObject : FrostFsObject
 {
-    public FrostFsLinkObject(FrostFsContainerId containerId, SplitId splitId, FrostFsObjectHeader largeObjectHeader) 
+    public FrostFsLinkObject(FrostFsContainerId containerId,
+        SplitId splitId,
+        FrostFsObjectHeader largeObjectHeader,
+        IList<FrostFsObjectId> children)
        : base(containerId)
    {
-        Header!.Split = new FrostFsSplit(splitId)
-        {
-            ParentHeader = largeObjectHeader
-        };
+        Header!.Split = new FrostFsSplit(splitId,
+            null,
+            null,
+            largeObjectHeader,
+            null,
+            new ReadOnlyCollection<FrostFsObjectId>(children));
    }
 }
--- a/src/FrostFS.SDK.ClientV2/Models/Object/FrostFsObject.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Object/FrostFsObject.cs
@ -1,9 +1,11 @@
-using System;
+using FrostFS.SDK.ClientV2;

 namespace FrostFS.SDK;

 public class FrostFsObject
 {
+    private byte[]? bytes;
+
    /// <summary>
    /// Creates new instance from <c>ObjectHeader</c>
    /// </summary>
@ -37,19 +39,27 @@ public class FrostFsObject
        get; set;
    }

-    /// <summary>
-    /// The size of payload cannot exceed <c>MaxObjectSize</c> value from <c>NetworkSettings</c>
-    /// Used only for PutSingleObject method
-    /// </summary>
-    /// <value>Buffer for output data</value>
-    public byte[] Payload { get; set; } = [];
-
    /// <summary>
    /// A payload is obtained via stream reader
    /// </summary>
    /// <value>Reader for received data</value>
    public IObjectReader? ObjectReader { get; set; }

+    internal byte[] SingleObjectPayload
+    {
+        get { return bytes ?? []; }
+    }
+
+    /// <summary>
+    /// The size of payload cannot exceed <c>MaxObjectSize</c> value from <c>NetworkSettings</c>
+    /// Used only for PutSingleObject method
+    /// </summary>
+    /// <value>Buffer for output data</value>
+    public void SetSingleObjectPayload(byte[] bytes)
+    {
+        this.bytes = bytes;
+    }
+
    /// <summary>
    /// Applied only for the last Object in chain in case of manual multipart uploading
    /// </summary>
@ -57,7 +67,7 @@ public class FrostFsObject
    public void SetParent(FrostFsObjectHeader largeObjectHeader)
    {
        if (Header?.Split == null)
-            throw new Exception("The object is not initialized properly");
+            throw new InvalidObjectException("The object is not initialized properly");

        Header.Split.ParentHeader = largeObjectHeader;
    }
--- a/src/FrostFS.SDK.ClientV2/Models/Object/FrostFsObjectFilter.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Object/FrostFsObjectFilter.cs
@ -27,7 +27,7 @@ public abstract class FrostFsObjectFilter<T>(FrostFsMatchType matchType, string
 /// <param name="matchType">Match type</param>
 /// <param name="key">Attribute key</param>
 /// <param name="value">Attribute value</param>
-public class FilterByAttribute(FrostFsMatchType matchType, string key, string value) : FrostFsObjectFilter<string>(matchType, key, value) { }
+public class FilterByAttributePair(FrostFsMatchType matchType, string key, string value) : FrostFsObjectFilter<string>(matchType, key, value) { }

 /// <summary>
 /// Creates filter to search by ObjectId
--- a/src/FrostFS.SDK.ClientV2/Models/Object/FrostFsObjectHeader.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Object/FrostFsObjectHeader.cs
@ -1,5 +1,5 @@
 using System;
-using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Linq;

 using FrostFS.Object;
@ -11,15 +11,17 @@ namespace FrostFS.SDK;
 public class FrostFsObjectHeader(
    FrostFsContainerId containerId,
    FrostFsObjectType type = FrostFsObjectType.Regular,
-    FrostFsAttribute[]? attributes = null,
+    FrostFsAttributePair[]? attributes = null,
    FrostFsSplit? split = null,
    FrostFsOwner? owner = null,
    FrostFsVersion? version = null)
 {
-    private Header header;
+    private Header? header;
    private Container.Container.Types.Attribute[]? grpsAttributes;
-   
-    public List<FrostFsAttribute> Attributes { get; internal set; } = attributes != null ? [.. attributes] : [];
+
+    public ReadOnlyCollection<FrostFsAttributePair>? Attributes { get; internal set; } =
+        attributes == null ? null :
+        new ReadOnlyCollection<FrostFsAttributePair>(attributes);

    public FrostFsContainerId ContainerId { get; } = containerId;

@ -65,9 +67,12 @@ public class FrostFsObjectHeader(
                PayloadLength = PayloadLength
            };

-            foreach (var attribute in Attributes)
+            if (Attributes != null)
            {
-                this.header.Attributes.Add(attribute.ToMessage());
+                foreach (var attribute in Attributes)
+                {
+                    this.header.Attributes.Add(attribute.ToMessage());
+                }
            }

            var split = Split;
--- a/src/FrostFS.SDK.ClientV2/Models/Object/FrostFsObjectId.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Object/FrostFsObjectId.cs
@ -10,6 +10,11 @@ public class FrostFsObjectId(string id)

    public static FrostFsObjectId FromHash(byte[] hash)
    {
+        if (hash is null)
+        {
+            throw new ArgumentNullException(nameof(hash));
+        }
+
        if (hash.Length != Constants.Sha256HashLength)
            throw new FormatException("ObjectID must be a sha256 hash.");

--- a/src/FrostFS.SDK.ClientV2/Models/Object/FrostFsOwner.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Object/FrostFsOwner.cs
@ -8,7 +8,7 @@ namespace FrostFS.SDK;

 public class FrostFsOwner(string id)
 {
-    private OwnerID ownerID;
+    private OwnerID? ownerID;

    public string Value { get; } = id;

@ -17,9 +17,9 @@ public class FrostFsOwner(string id)
        return new FrostFsOwner(key.PublicKey().PublicKeyToAddress());
    }

-    internal OwnerID OwnerID 
+    internal OwnerID OwnerID
    {
-        get 
+        get
        {
            ownerID ??= this.ToMessage();
            return ownerID;
--- a/src/FrostFS.SDK.ClientV2/Models/Object/FrostFsSplit.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Object/FrostFsSplit.cs
@ -1,8 +1,13 @@
-using System.Collections.Generic;
+using System.Collections.ObjectModel;

 namespace FrostFS.SDK;

-public class FrostFsSplit(SplitId splitId)
+public class FrostFsSplit(SplitId splitId,
+    FrostFsObjectId? previous = null,
+    FrostFsObjectId? parent = null,
+    FrostFsObjectHeader? parentHeader = null,
+    FrostFsSignature? parentSignature = null,
+    ReadOnlyCollection<FrostFsObjectId>? children = null)
 {
    public FrostFsSplit() : this(new SplitId())
    {
@ -10,15 +15,14 @@ public class FrostFsSplit(SplitId splitId)

    public SplitId SplitId { get; private set; } = splitId;

-    public FrostFsObjectId? Parent { get; set; }
+    public FrostFsObjectId? Previous { get; } = previous;

-    public FrostFsObjectId? Previous { get; set; }
+    public FrostFsObjectId? Parent { get; } = parent;

-    public FrostFsSignature? ParentSignature { get; set; }
+    public FrostFsSignature? ParentSignature { get; } = parentSignature;

-    public FrostFsObjectHeader? ParentHeader { get; set; }
+    public FrostFsObjectHeader? ParentHeader { get; set; } = parentHeader;

-    public List<FrostFsObjectId> Children { get; } = [];
+    public ReadOnlyCollection<FrostFsObjectId>? Children { get; } = children;

-    public Refs.Signature ParentSignatureGrpc { get; set; }
 }
--- a/src/FrostFS.SDK.ClientV2/Models/Object/SplitId.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Object/SplitId.cs
@ -1,35 +1,35 @@
-using FrostFS.SDK.Cryptography;
+using System;
+
+using FrostFS.SDK.Cryptography;

 using Google.Protobuf;

-using System;
-
 namespace FrostFS.SDK;

 public class SplitId
 {
    private readonly Guid id;

-    private ByteString? _message;
+    private ByteString? message;

    public SplitId()
    {
-        id = Guid.NewGuid();
+        this.id = Guid.NewGuid();
    }

-    public SplitId(Guid guid)
+    public SplitId(Guid id)
    {
-        id = guid;
+        this.id = id;
    }

    private SplitId(byte[] binary)
    {
-        id = new Guid(binary);
+        this.id = new Guid(binary);
    }

    private SplitId(string str)
    {
-        id = new Guid(str);
+        this.id = new Guid(str);
    }

    public static SplitId CreateFromBinary(byte[] binaryData)
@ -44,19 +44,19 @@ public class SplitId

    public override string ToString()
    {
-        return id.ToString();
+        return this.id.ToString();
    }

    public byte[]? ToBinary()
    {
-        if (id == Guid.Empty)
+        if (this.id == Guid.Empty)
            return null;

-        return id.ToBytes();
+        return this.id.ToBytes();
    }

    public ByteString? GetSplitId()
    {
-        return _message ??= ByteString.CopyFrom(ToBinary());
+        return this.message ??= ByteString.CopyFrom(ToBinary());
    }
 }
--- a/src/FrostFS.SDK.ClientV2/Models/Response/FrostFsSignature.cs
+++ b/src/FrostFS.SDK.ClientV2/Models/Response/FrostFsSignature.cs
@ -1,6 +1,6 @@
 namespace FrostFS.SDK;

-public class FrostFsSignature
+public class FrostFsSignature()
 {
    public byte[]? Key { get; set; }

--- a/src/FrostFS.SDK.ClientV2/Parameters/Context.cs
+++ b/src/FrostFS.SDK.ClientV2/Parameters/Context.cs
@ -1,5 +1,5 @@
 using System;
-using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Security.Cryptography;
 using System.Threading;

@ -13,32 +13,32 @@ namespace FrostFS.SDK.ClientV2;

 public class Context()
 {
-    private List<Interceptor>? interceptors;
+    private ReadOnlyCollection<Interceptor>? interceptors;

    private ByteString? publicKeyCache;

-    public ECDsa Key { get; set; }
+    public ECDsa? Key { get; set; }

-    public FrostFsOwner OwnerId { get; set; }
+    public FrostFsOwner? OwnerId { get; set; }

-    public FrostFsVersion Version { get; set; }
+    public FrostFsVersion? Version { get; set; }
+
+    public CancellationToken CancellationToken { get; set; }
+
+    public TimeSpan Timeout { get; set; }

-    public CancellationToken CancellationToken { get; set; } = default;
-    
-    public TimeSpan Timeout { get; set; } = default;
-    
    public DateTime? Deadline => Timeout.Ticks > 0 ? DateTime.UtcNow.Add(Timeout) : null;

    public Action<CallStatistics>? Callback { get; set; }

-    public List<Interceptor> Interceptors
+    public ReadOnlyCollection<Interceptor>? Interceptors
    {
-        get { return this.interceptors ??= []; }
+        get { return this.interceptors; }
        set { this.interceptors = value; }
    }

    public ByteString? GetPublicKeyCache()
-    { 
+    {
        if (publicKeyCache == null && Key != null)
        {
            publicKeyCache = ByteString.CopyFrom(Key.PublicKey());
--- a/src/FrostFS.SDK.ClientV2/Parameters/PrmBase.cs
+++ b/src/FrostFS.SDK.ClientV2/Parameters/PrmBase.cs
@ -2,12 +2,12 @@

 namespace FrostFS.SDK.ClientV2;

-public class PrmBase() : IContext
+public class PrmBase(NameValueCollection? xheaders = null) : IContext
 {
    /// <summary>
    /// FrostFS request X-Headers
    /// </summary>
-    public NameValueCollection XHeaders { get; set; } = [];
+    public NameValueCollection XHeaders { get; } = xheaders ?? [];

    /// <inheritdoc />
    public Context? Context { get; set; }
--- a/src/FrostFS.SDK.ClientV2/Parameters/PrmContainerCreate.cs
+++ b/src/FrostFS.SDK.ClientV2/Parameters/PrmContainerCreate.cs
@ -9,7 +9,7 @@ public sealed class PrmContainerCreate(FrostFsContainerInfo container) : PrmBase
    /// </summary>
    /// <value>Rules for polling the result</value>
    public PrmWait? WaitParams { get; set; }
-    
+
    /// <summary>
    /// Blank session token
    /// </summary>
--- a/src/FrostFS.SDK.ClientV2/Parameters/PrmNetmapSnapshot.cs
+++ b/src/FrostFS.SDK.ClientV2/Parameters/PrmNetmapSnapshot.cs
@ -1,5 +1,5 @@
 namespace FrostFS.SDK.ClientV2;

 public sealed class PrmNetmapSnapshot() : PrmBase
-{    
+{
 }
--- a/src/FrostFS.SDK.ClientV2/Parameters/PrmNetworkSettings.cs
+++ b/src/FrostFS.SDK.ClientV2/Parameters/PrmNetworkSettings.cs
@ -1,5 +1,5 @@
 namespace FrostFS.SDK.ClientV2;

 public sealed class PrmNetworkSettings() : PrmBase
-{   
+{
 }
--- a/src/FrostFS.SDK.ClientV2/Parameters/PrmNodeInfo.cs
+++ b/src/FrostFS.SDK.ClientV2/Parameters/PrmNodeInfo.cs
@ -1,5 +1,5 @@
 namespace FrostFS.SDK.ClientV2;

 public sealed class PrmNodeInfo() : PrmBase
-{   
+{
 }
--- a/src/FrostFS.SDK.ClientV2/Parameters/PrmObjectHeadGet.cs
+++ b/src/FrostFS.SDK.ClientV2/Parameters/PrmObjectHeadGet.cs
@ -3,7 +3,7 @@
 public sealed class PrmObjectHeadGet(FrostFsContainerId containerId, FrostFsObjectId objectId) : PrmBase, ISessionToken
 {
    public FrostFsContainerId ContainerId { get; set; } = containerId;
-    
+
    public FrostFsObjectId ObjectId { get; set; } = objectId;

    /// <inheritdoc />
--- a/src/FrostFS.SDK.ClientV2/Parameters/PrmObjectPut.cs
+++ b/src/FrostFS.SDK.ClientV2/Parameters/PrmObjectPut.cs
@ -28,7 +28,7 @@ public sealed class PrmObjectPut : PrmBase, ISessionToken
    /// Overrides default size of the buffer for stream transferring.
    /// </summary>
    /// <value>Size of the buffer</value>
-    public int BufferMaxSize { get; set; }  
+    public int BufferMaxSize { get; set; }

    /// <summary>
    /// Allows to define a buffer for chunks to manage by the memory allocation and releasing.
@ -40,7 +40,7 @@ public sealed class PrmObjectPut : PrmBase, ISessionToken

    internal int MaxObjectSizeCache { get; set; }

-    internal ulong CurrentStreamPosition { get; set; } = 0;
+    internal ulong CurrentStreamPosition { get; set; }

-    internal ulong FullLength { get; set; } = 0;
+    internal ulong FullLength { get; set; }
 }
--- a/src/FrostFS.SDK.ClientV2/Services/ContainerServiceProvider.cs
+++ b/src/FrostFS.SDK.ClientV2/Services/ContainerServiceProvider.cs
@ -3,22 +3,22 @@ using System.Collections.Generic;
 using System.Collections.Specialized;
 using System.Threading.Tasks;

-using FrostFS.SDK.ClientV2;
 using FrostFS.Container;
+using FrostFS.Refs;
+using FrostFS.SDK.ClientV2;
 using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.Cryptography;
-using FrostFS.Refs;
 using FrostFS.Session;

 namespace FrostFS.SDK.ClientV2;

-internal class ContainerServiceProvider(ContainerService.ContainerServiceClient service, ClientEnvironment context) : ContextAccessor(context), ISessionProvider
+internal sealed class ContainerServiceProvider(ContainerService.ContainerServiceClient service, ClientEnvironment context) : ContextAccessor(context), ISessionProvider
 {
    readonly SessionProvider sessions = new(context);

    public async ValueTask<SessionToken> GetOrCreateSession(ISessionToken args, Context ctx)
    {
-        return await sessions.GetOrCreateSession(args, ctx);
+        return await sessions.GetOrCreateSession(args, ctx).ConfigureAwait(false);
    }

    internal async Task<FrostFsContainerInfo> GetContainerAsync(PrmContainerGet args)
@ -35,22 +35,29 @@ internal class ContainerServiceProvider(ContainerService.ContainerServiceClient
    internal async IAsyncEnumerable<FrostFsContainerId> ListContainersAsync(PrmContainerGetAll args)
    {
        var ctx = args.Context!;
+        ctx.OwnerId ??= Context.Owner;
+        ctx.Key ??= Context.Key?.ECDsaKey;
+
+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));
+        if (ctx.OwnerId == null)
+            throw new InvalidObjectException(nameof(ctx.OwnerId));

        var request = new ListRequest
        {
-            Body = new () 
+            Body = new()
            {
-                OwnerId = ctx.OwnerId.ToMessage() 
+                OwnerId = ctx.OwnerId.ToMessage()
            }
        };
-        
+
        request.AddMetaHeader(args.XHeaders);
        request.Sign(ctx.Key);

        var response = await service.ListAsync(request, null, ctx.Deadline, ctx.CancellationToken);
-       
+
        Verifier.CheckResponse(response);
-       
+
        foreach (var cid in response.Body.ContainerIds)
        {
            yield return new FrostFsContainerId(Base58.Encode(cid.Value.ToByteArray()));
@ -63,42 +70,52 @@ internal class ContainerServiceProvider(ContainerService.ContainerServiceClient

        var grpcContainer = args.Container.GetContainer();

-        grpcContainer.OwnerId ??= ctx.OwnerId.ToMessage();
-        grpcContainer.Version ??= ctx.Version.ToMessage();
+        grpcContainer.OwnerId ??= ctx.OwnerId?.ToMessage();
+        grpcContainer.Version ??= ctx.Version?.ToMessage();
+
+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));
+        if (grpcContainer.OwnerId == null)
+            throw new InvalidObjectException(nameof(grpcContainer.OwnerId));
+        if (grpcContainer.Version == null)
+            throw new InvalidObjectException(nameof(grpcContainer.Version));

        var request = new PutRequest
        {
            Body = new PutRequest.Types.Body
            {
                Container = grpcContainer,
-                Signature = ctx.Key.SignRFC6979(grpcContainer)               
+                Signature = ctx.Key.SignRFC6979(grpcContainer)
            }
        };

-        var sessionToken = await GetOrCreateSession(args, ctx);
+        var sessionToken = await GetOrCreateSession(args, ctx).ConfigureAwait(false);

        sessionToken.CreateContainerTokenContext(
            null,
            ContainerSessionContext.Types.Verb.Put,
            ctx.Key,
-            ctx.GetPublicKeyCache());
+            ctx.GetPublicKeyCache()!);

        request.AddMetaHeader(args.XHeaders, sessionToken);

        request.Sign(ctx.Key);

        var response = await service.PutAsync(request, null, ctx.Deadline, ctx.CancellationToken);
-      
+
        Verifier.CheckResponse(response);

-        await WaitForContainer(WaitExpects.Exists, response.Body.ContainerId, args.WaitParams, ctx);
-      
-        return new FrostFsContainerId(response.Body.ContainerId);        
+        await WaitForContainer(WaitExpects.Exists, response.Body.ContainerId, args.WaitParams, ctx).ConfigureAwait(false);
+
+        return new FrostFsContainerId(response.Body.ContainerId);
    }

    internal async Task DeleteContainerAsync(PrmContainerDelete args)
    {
        var ctx = args.Context!;
+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));
+
        var request = new DeleteRequest
        {
            Body = new DeleteRequest.Types.Body
@ -108,13 +125,13 @@ internal class ContainerServiceProvider(ContainerService.ContainerServiceClient
            }
        };

-        var sessionToken = await GetOrCreateSession(args, ctx);
+        var sessionToken = await GetOrCreateSession(args, ctx).ConfigureAwait(false);

        sessionToken.CreateContainerTokenContext(
            request.Body.ContainerId,
            ContainerSessionContext.Types.Verb.Delete,
            ctx.Key,
-            ctx.GetPublicKeyCache());
+            ctx.GetPublicKeyCache()!);

        request.AddMetaHeader(args.XHeaders, sessionToken);

@ -124,13 +141,17 @@ internal class ContainerServiceProvider(ContainerService.ContainerServiceClient

        Verifier.CheckResponse(response);

-        await WaitForContainer(WaitExpects.Removed, request.Body.ContainerId, args.WaitParams, ctx);
-    
+        await WaitForContainer(WaitExpects.Removed, request.Body.ContainerId, args.WaitParams, ctx)
+            .ConfigureAwait(false);
+
        Verifier.CheckResponse(response);
    }

    private static GetRequest GetContainerRequest(ContainerID id, NameValueCollection? xHeaders, Context ctx)
    {
+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));
+
        var request = new GetRequest
        {
            Body = new GetRequest.Types.Body
@ -146,7 +167,7 @@ internal class ContainerServiceProvider(ContainerService.ContainerServiceClient
    }

    private enum WaitExpects
-    { 
+    {
        Exists,
        Removed
    }
@ -161,7 +182,7 @@ internal class ContainerServiceProvider(ContainerService.ContainerServiceClient
            Verifier.CheckResponse(response);
        }

-        await WaitFor(action, expect, waitParams);
+        await WaitFor(action, expect, waitParams).ConfigureAwait(false);
    }

    private static async Task WaitFor(
@ -176,7 +197,7 @@ internal class ContainerServiceProvider(ContainerService.ContainerServiceClient
        {
            try
            {
-                await action();
+                await action().ConfigureAwait(false);

                if (expect == WaitExpects.Exists)
                    return;
@ -184,20 +205,20 @@ internal class ContainerServiceProvider(ContainerService.ContainerServiceClient
                if (DateTime.UtcNow >= deadLine)
                    throw new TimeoutException();

-                await Task.Delay(waitParams.PollInterval);
+                await Task.Delay(waitParams.PollInterval).ConfigureAwait(false);
            }
            catch (ResponseException ex)
            {
                if (DateTime.UtcNow >= deadLine)
                    throw new TimeoutException();

-                if (ex.Status.Code != FrostFsStatusCode.ContainerNotFound)
+                if (ex.Status?.Code != FrostFsStatusCode.ContainerNotFound)
                    throw;

                if (expect == WaitExpects.Removed)
                    return;

-                await Task.Delay(waitParams.PollInterval);
+                await Task.Delay(waitParams.PollInterval).ConfigureAwait(false);
            }
        }
    }
--- a/src/FrostFS.SDK.ClientV2/Services/NetmapServiceProvider.cs
+++ b/src/FrostFS.SDK.ClientV2/Services/NetmapServiceProvider.cs
@ -8,12 +8,12 @@ using static FrostFS.Netmap.NetworkConfig.Types;

 namespace FrostFS.SDK.ClientV2;

-internal class NetmapServiceProvider : ContextAccessor
-{  
+internal sealed class NetmapServiceProvider : ContextAccessor
+{
    private readonly NetmapService.NetmapServiceClient netmapServiceClient;
-    
-    internal NetmapServiceProvider(NetmapService.NetmapServiceClient netmapServiceClient, ClientEnvironment context) 
-        : base(context) 
+
+    internal NetmapServiceProvider(NetmapService.NetmapServiceClient netmapServiceClient, ClientEnvironment context)
+        : base(context)
    {
        this.netmapServiceClient = netmapServiceClient;
    }
@ -23,7 +23,7 @@ internal class NetmapServiceProvider : ContextAccessor
        if (Context.NetworkSettings != null)
            return Context.NetworkSettings;

-        var info = await GetNetworkInfoAsync(ctx);
+        var info = await GetNetworkInfoAsync(ctx).ConfigureAwait(false);

        var settings = new NetworkSettings();

@ -33,13 +33,18 @@ internal class NetmapServiceProvider : ContextAccessor
        }

        Context.NetworkSettings = settings;
-        
+
        return settings;
    }

    internal async Task<FrostFsNodeInfo> GetLocalNodeInfoAsync(PrmNodeInfo args)
    {
        var ctx = args.Context!;
+        ctx.Key ??= Context.Key?.ECDsaKey;
+
+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));
+
        var request = new LocalNodeInfoRequest
        {
            Body = new LocalNodeInfoRequest.Types.Body { }
@ -47,7 +52,7 @@ internal class NetmapServiceProvider : ContextAccessor

        request.AddMetaHeader(args.XHeaders);
        request.Sign(ctx.Key);
-        
+
        var response = await netmapServiceClient.LocalNodeInfoAsync(request, null, ctx.Deadline, ctx.CancellationToken);

        Verifier.CheckResponse(response);
@ -57,12 +62,18 @@ internal class NetmapServiceProvider : ContextAccessor

    internal async Task<NetworkInfoResponse> GetNetworkInfoAsync(Context ctx)
    {
-        var request = new NetworkInfoRequest(); 
+        ctx.Key ??= Context.Key?.ECDsaKey;
+
+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));
+
+        var request = new NetworkInfoRequest();

        request.AddMetaHeader(null);
        request.Sign(ctx.Key);
- 
-        var response = await netmapServiceClient.NetworkInfoAsync(request, null, ctx.Deadline, ctx.CancellationToken);
+
+        var response = await netmapServiceClient.NetworkInfoAsync(request, null, ctx.Deadline, ctx.CancellationToken)
+            .ConfigureAwait(false);

        Verifier.CheckResponse(response);

@ -72,12 +83,16 @@ internal class NetmapServiceProvider : ContextAccessor
    internal async Task<FrostFsNetmapSnapshot> GetNetmapSnapshotAsync(PrmNetmapSnapshot args)
    {
        var ctx = args.Context!;
+        ctx.Key ??= Context.Key?.ECDsaKey;
+
+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));

        var request = new NetmapSnapshotRequest();

        request.AddMetaHeader(args.XHeaders);
        request.Sign(ctx.Key);
- 
+
        var response = await netmapServiceClient.NetmapSnapshotAsync(request, null, ctx.Deadline, ctx.CancellationToken);

        Verifier.CheckResponse(response);
@ -95,12 +110,12 @@ internal class NetmapServiceProvider : ContextAccessor
        ulong val = 0;
        for (var i = bytes.Length - 1; i >= 0; i--)
            val = (val << 8) + bytes[i];
-        
+
        return val;
    }

    private static void SetNetworksParam(Parameter param, NetworkSettings settings)
-    { 
+    {
        var key = Encoding.UTF8.GetString(param.Key.ToByteArray());

        var valueBytes = param.Value.ToByteArray();
--- a/src/FrostFS.SDK.ClientV2/Services/ObjectServiceProvider.cs
+++ b/src/FrostFS.SDK.ClientV2/Services/ObjectServiceProvider.cs
@ -6,9 +6,8 @@ using System.Threading.Tasks;

 using FrostFS.Object;
 using FrostFS.Refs;
-using FrostFS.SDK.ClientV2.Extensions;
-using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.ClientV2;
+using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.Cryptography;
 using FrostFS.Session;

@ -16,19 +15,30 @@ using Google.Protobuf;

 namespace FrostFS.SDK.ClientV2;

-internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, ClientEnvironment env)
-    : ContextAccessor(env), ISessionProvider
+internal sealed class ObjectServiceProvider : ContextAccessor, ISessionProvider
 {
-    readonly SessionProvider sessions = new (env);
+    private readonly SessionProvider sessions;
+    private ObjectService.ObjectServiceClient client;

-    public async ValueTask<Session.SessionToken> GetOrCreateSession(ISessionToken args, Context ctx)
+    internal ObjectServiceProvider(ObjectService.ObjectServiceClient client, ClientEnvironment env)
+        : base(env)
    {
-        return await sessions.GetOrCreateSession(args, ctx);
+        this.sessions = new(Context);
+        this.client = client;
+    }
+
+    public async ValueTask<SessionToken> GetOrCreateSession(ISessionToken args, Context ctx)
+    {
+        return await sessions.GetOrCreateSession(args, ctx).ConfigureAwait(false);
    }

    internal async Task<FrostFsObjectHeader> GetObjectHeadAsync(PrmObjectHeadGet args)
    {
        var ctx = args.Context!;
+        ctx.Key ??= Context.Key?.ECDsaKey;
+
+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));

        var request = new HeadRequest
        {
@ -42,7 +52,7 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
            }
        };

-        var sessionToken = await GetOrCreateSession(args, ctx);
+        var sessionToken = await GetOrCreateSession(args, ctx).ConfigureAwait(false);

        sessionToken.CreateObjectTokenContext(
            request.Body.Address,
@ -53,8 +63,8 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C

        request.Sign(ctx.Key);

-        var response = await client!.HeadAsync(request, null, ctx.Deadline, ctx.CancellationToken);
-        
+        var response = await client!.HeadAsync(request, null, ctx.Deadline, ctx.CancellationToken).ConfigureAwait(false);
+
        Verifier.CheckResponse(response);

        return response.Body.Header.Header.ToModel();
@ -63,7 +73,12 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
    internal async Task<FrostFsObject> GetObjectAsync(PrmObjectGet args)
    {
        var ctx = args.Context!;
-       
+
+        ctx.Key ??= Context.Key?.ECDsaKey;
+
+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));
+
        var request = new GetRequest
        {
            Body = new GetRequest.Types.Body
@ -76,7 +91,7 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
            }
        };

-        var sessionToken = await GetOrCreateSession(args, ctx);
+        var sessionToken = await GetOrCreateSession(args, ctx).ConfigureAwait(false);

        sessionToken.CreateObjectTokenContext(
            request.Body.Address,
@ -87,12 +102,17 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C

        request.Sign(ctx.Key);

-        return await GetObject(request, ctx);
+        return await GetObject(request, ctx).ConfigureAwait(false);
    }

    internal async Task DeleteObjectAsync(PrmObjectDelete args)
    {
        var ctx = args.Context!;
+        ctx.Key ??= Context.Key?.ECDsaKey;
+
+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));
+
        var request = new DeleteRequest
        {
            Body = new DeleteRequest.Types.Body
@ -105,7 +125,7 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
            }
        };

-        var sessionToken = await GetOrCreateSession(args, ctx);
+        var sessionToken = await GetOrCreateSession(args, ctx).ConfigureAwait(false);

        sessionToken.CreateObjectTokenContext(
            request.Body.Address,
@ -116,26 +136,29 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
        request.Sign(ctx.Key);

        var response = await client.DeleteAsync(request, null, ctx.Deadline, ctx.CancellationToken);
-        
+
        Verifier.CheckResponse(response);
    }

    internal async IAsyncEnumerable<FrostFsObjectId> SearchObjectsAsync(PrmObjectSearch args)
    {
        var ctx = args.Context!;
+
+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));
+
        var request = new SearchRequest
        {
            Body = new SearchRequest.Types.Body
            {
                ContainerId = args.ContainerId.ToMessage(),
-                Filters = { },
                Version = 1  // TODO: clarify this param
            }
        };

        request.Body.Filters.AddRange(args.Filters.Select(f => f.ToMessage()));
-        
-        var sessionToken = await GetOrCreateSession(args, ctx);
+
+        var sessionToken = await GetOrCreateSession(args, ctx).ConfigureAwait(false);

        sessionToken.CreateObjectTokenContext(
            new Address { ContainerId = request.Body.ContainerId },
@ -143,7 +166,7 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
            ctx.Key);

        request.AddMetaHeader(args.XHeaders, sessionToken);
-                
+
        request.Sign(ctx.Key);

        var objectsIds = SearchObjects(request, ctx);
@ -156,14 +179,17 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C

    internal async Task<FrostFsObjectId> PutObjectAsync(PrmObjectPut args)
    {
+        if (args is null)
+            throw new ArgumentNullException(nameof(args));
+
        if (args.Header == null)
-            throw new ArgumentException("Value cannot be null", nameof(args.Header));
-        
+            throw new ArgumentException(nameof(args.Header));
+
        if (args.Payload == null)
-            throw new ArgumentException("Value cannot be null", nameof(args.Payload));
+            throw new ArgumentException(nameof(args.Payload));

        if (args.ClientCut)
-            return await PutClientCutObject(args);
+            return await PutClientCutObject(args).ConfigureAwait(false);
        else
        {
            if (args.Header.PayloadLength > 0)
@ -171,24 +197,28 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
            else if (args.Payload.CanSeek)
                args.FullLength = (ulong)args.Payload.Length;

-            return (await PutStreamObject(args)).ObjectId;
+            return (await PutStreamObject(args).ConfigureAwait(false)).ObjectId;
        }
    }
-   
+
    internal async Task<FrostFsObjectId> PutSingleObjectAsync(PrmSingleObjectPut args)
    {
        var ctx = args.Context!;
+
+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));
+
        var grpcObject = ObjectTools.CreateObject(args.FrostFsObject, ctx);

        var request = new PutSingleRequest
        {
-            Body = new () { Object = grpcObject }
+            Body = new() { Object = grpcObject }
        };

-        var sessionToken = await GetOrCreateSession(args, ctx);
+        var sessionToken = await GetOrCreateSession(args, ctx).ConfigureAwait(false);

        sessionToken.CreateObjectTokenContext(
-            new Address { ContainerId = grpcObject.Header.ContainerId, ObjectId = grpcObject.ObjectId},
+            new Address { ContainerId = grpcObject.Header.ContainerId, ObjectId = grpcObject.ObjectId },
            ObjectSessionContext.Types.Verb.Put,
            ctx.Key);

@ -196,18 +226,18 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C

        request.Sign(ctx.Key);

-        var response = await client.PutSingleAsync(request, null, ctx.Deadline, ctx.CancellationToken);
+        var response = await client.PutSingleAsync(request, null, ctx.Deadline, ctx.CancellationToken).ConfigureAwait(false);

        Verifier.CheckResponse(response);
-        
+
        return FrostFsObjectId.FromHash(grpcObject.ObjectId.Value.ToByteArray());
    }
-    
+
    private async Task<FrostFsObjectId> PutClientCutObject(PrmObjectPut args)
    {
        var ctx = args.Context!;
-       
-        var tokenRaw = await GetOrCreateSession(args, ctx);
+
+        var tokenRaw = await GetOrCreateSession(args, ctx).ConfigureAwait(false);
        var token = new FrostFsSessionToken(tokenRaw.Serialize());

        args.SessionToken = token;
@ -216,7 +246,7 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
        var header = args.Header!;

        var fullLength = header.PayloadLength;
-        
+
        if (payloadStream.CanSeek && fullLength == 0)
            fullLength = (ulong)payloadStream.Length;

@ -224,12 +254,14 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C

        if (args.MaxObjectSizeCache == 0)
        {
-            var networkSettings = await Context.Client.GetNetworkSettingsAsync(new PrmNetworkSettings() { Context = ctx });
+            var networkSettings = await Context.Client.GetNetworkSettingsAsync(new PrmNetworkSettings() { Context = ctx })
+                .ConfigureAwait(false);
+
            args.MaxObjectSizeCache = (int)networkSettings.MaxObjectSize;
        }

        var restBytes = fullLength - args.CurrentStreamPosition;
-        var objectSize = restBytes > 0 ? (int)Math.Min((ulong)args.MaxObjectSizeCache, restBytes) : args.MaxObjectSizeCache;        
+        var objectSize = restBytes > 0 ? (int)Math.Min((ulong)args.MaxObjectSizeCache, restBytes) : args.MaxObjectSizeCache;

        //define collection capacity
        var restPart = (restBytes % (ulong)objectSize) > 0 ? 1 : 0;
@ -238,23 +270,20 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
        List<FrostFsObjectId> sentObjectIds = new(objectsCount);

        FrostFsSplit? split = null;
+        SplitId splitId = new();

        // keep attributes for the large object
        var attributes = args.Header!.Attributes;
+        args.Header!.Attributes = null;

        // send all parts except the last one as separate Objects
-        while (restBytes > (ulong)args.MaxObjectSizeCache) 
+        while (restBytes > (ulong)args.MaxObjectSizeCache)
        {
-            if (split == null)
-            {
-                split = new FrostFsSplit();
-                args.Header!.Attributes = [];                
-            }
+            split = new FrostFsSplit(splitId, sentObjectIds.LastOrDefault());

-            split!.Previous = sentObjectIds.LastOrDefault();
            args.Header!.Split = split;

-            var result = await PutStreamObject(args);
+            var result = await PutStreamObject(args).ConfigureAwait(false);

            sentObjectIds.Add(result.ObjectId);

@ -264,26 +293,30 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
        // send the last part and create linkObject
        if (sentObjectIds.Count > 0)
        {
-            var largeObjectHeader = new FrostFsObjectHeader(header.ContainerId) { PayloadLength = fullLength };
-
-            largeObjectHeader.Attributes.AddRange(attributes);
+            var largeObjectHeader = new FrostFsObjectHeader(header.ContainerId, FrostFsObjectType.Regular, [.. attributes])
+            {
+                PayloadLength = fullLength,
+            };

            args.Header.Split!.ParentHeader = largeObjectHeader;

-            var result = await PutStreamObject(args);
+            var result = await PutStreamObject(args).ConfigureAwait(false);

            sentObjectIds.Add(result.ObjectId);

-            var linkObject = new FrostFsLinkObject(header.ContainerId, split!.SplitId, largeObjectHeader)
-                .AddChildren(sentObjectIds);
+            var linkObject = new FrostFsLinkObject(header.ContainerId, split!.SplitId, largeObjectHeader, sentObjectIds);

-            _ = await PutSingleObjectAsync(new PrmSingleObjectPut(linkObject) { Context = args.Context});
+            _ = await PutSingleObjectAsync(new PrmSingleObjectPut(linkObject) { Context = args.Context }).ConfigureAwait(false);

-            return split.Parent!;
+            var parentHeader = args.Header.GetHeader();
+
+            return parentHeader.Split!.Parent.ToModel();
        }

        // We are here if the payload is placed to one Object. It means no cut action, just simple PUT.
-        var singlePartResult = await PutStreamObject(args);
+        args.Header!.Attributes = attributes;
+
+        var singlePartResult = await PutStreamObject(args).ConfigureAwait(false);

        return singlePartResult.ObjectId;
    }
@ -297,6 +330,9 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
    private async Task<PutObjectResult> PutStreamObject(PrmObjectPut args)
    {
        var ctx = args.Context!;
+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));
+
        var payload = args.Payload!;

        var chunkSize = args.BufferMaxSize > 0 ? args.BufferMaxSize : Constants.ObjectChunkSize;
@ -307,7 +343,7 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C

        bool isRentBuffer = false;
        byte[]? chunkBuffer = null;
-        
+
        try
        {
            if (args.CustomBuffer != null)
@ -316,7 +352,7 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
            }
            else
            {
-                chunkBuffer = env.GetArrayPool(Constants.ObjectChunkSize).Rent(chunkSize);
+                chunkBuffer = Context.GetArrayPool(Constants.ObjectChunkSize).Rent(chunkSize);
                isRentBuffer = true;
            }

@ -325,7 +361,7 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
            // 0 means no limit from client, so server side cut is performed
            var objectLimitSize = args.ClientCut ? args.MaxObjectSizeCache : 0;

-            var stream = await GetUploadStream(args, ctx);
+            using var stream = await GetUploadStream(args, ctx).ConfigureAwait(false);

            while (objectLimitSize == 0 || sentBytes < objectLimitSize)
            {
@ -334,7 +370,7 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
                    (int)Math.Min(objectLimitSize - sentBytes, chunkSize)
                    : chunkSize;

-                var bytesCount = await payload.ReadAsync(chunkBuffer, 0, bufferSize, ctx.CancellationToken);
+                var bytesCount = await payload.ReadAsync(chunkBuffer, 0, bufferSize, ctx.CancellationToken).ConfigureAwait(false);

                if (bytesCount == 0)
                    break;
@ -351,10 +387,10 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C

                chunkRequest.Sign(ctx.Key);

-                await stream.Write(chunkRequest);
+                await stream.Write(chunkRequest).ConfigureAwait(false);
            }

-            var response = await stream.Close();
+            var response = await stream.Close().ConfigureAwait(false);
            Verifier.CheckResponse(response);

            return new PutObjectResult(FrostFsObjectId.FromHash(response.Body.ObjectId.Value.ToByteArray()), sentBytes);
@ -372,6 +408,9 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
    {
        var header = args.Header!;

+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));
+
        header.OwnerId ??= ctx.OwnerId;
        header.Version ??= ctx.Version;

@ -395,7 +434,7 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
            }
        };

-        var sessionToken = await GetOrCreateSession(args, ctx);
+        var sessionToken = await GetOrCreateSession(args, ctx).ConfigureAwait(false);

        sessionToken.CreateObjectTokenContext(
            new Address { ContainerId = grpcHeader.ContainerId, ObjectId = oid },
@ -407,19 +446,19 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C

        initRequest.Sign(ctx.Key);

-        return await PutObjectInit(initRequest, ctx);
+        return await PutObjectInit(initRequest, ctx).ConfigureAwait(false);
    }

    private async Task<FrostFsObject> GetObject(GetRequest request, Context ctx)
    {
        var reader = GetObjectInit(request, ctx);
-      
-        var grpcObject = await reader.ReadHeader();
+
+        var grpcObject = await reader.ReadHeader().ConfigureAwait(false);
        var modelObject = grpcObject.ToModel();
-      
+
        modelObject.ObjectReader = reader;

-        return modelObject;       
+        return modelObject;
    }

    private ObjectReader GetObjectInit(GetRequest initRequest, Context ctx)
@ -428,7 +467,7 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
            throw new ArgumentNullException(nameof(initRequest));

        var call = client.Get(initRequest, null, ctx.Deadline, ctx.CancellationToken);
- 
+
        return new ObjectReader(call);
    }

@ -441,7 +480,7 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C

        var call = client.Put(null, ctx.Deadline, ctx.CancellationToken);

-        await call.RequestStream.WriteAsync(initRequest);
+        await call.RequestStream.WriteAsync(initRequest).ConfigureAwait(false);

        return new ObjectStreamer(call);
    }
@ -449,14 +488,14 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
    private async IAsyncEnumerable<ObjectID> SearchObjects(SearchRequest request, Context ctx)
    {
        using var stream = GetSearchReader(request, ctx);
-       
+
        while (true)
        {
-            var ids = await stream.Read(ctx.CancellationToken);
+            var ids = await stream.Read(ctx.CancellationToken).ConfigureAwait(false);

            if (ids == null)
                break;
-                
+
            foreach (var oid in ids)
            {
                yield return oid;
@ -472,7 +511,7 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
        }

        var call = client.Search(initRequest, null, ctx.Deadline, ctx.CancellationToken);
-    
+
        return new SearchReader(call);
-    }   
+    }
 }
--- a/src/FrostFS.SDK.ClientV2/Services/SessionServiceProvider.cs
+++ b/src/FrostFS.SDK.ClientV2/Services/SessionServiceProvider.cs
@ -1,17 +1,17 @@
 using System.Threading.Tasks;

-using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.ClientV2;
+using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.Session;

 namespace FrostFS.SDK.ClientV2;

-internal class SessionServiceProvider : ContextAccessor
-{  
+internal sealed class SessionServiceProvider : ContextAccessor
+{
    private readonly SessionService.SessionServiceClient? _sessionServiceClient;

    internal SessionServiceProvider(SessionService.SessionServiceClient? sessionServiceClient, ClientEnvironment context)
-        : base (context)
+        : base(context)
    {
        _sessionServiceClient = sessionServiceClient;
    }
@ -19,27 +19,30 @@ internal class SessionServiceProvider : ContextAccessor
    internal async Task<SessionToken> CreateSessionAsync(PrmSessionCreate args)
    {
        var ctx = args.Context!;
+
+        ctx.OwnerId ??= Context.Owner;
+
        var request = new CreateRequest
        {
            Body = new CreateRequest.Types.Body
            {
-                OwnerId = ctx.OwnerId.ToMessage(),
+                OwnerId = ctx.OwnerId!.ToMessage(),
                Expiration = args.Expiration
            }
        };

        request.AddMetaHeader(args.XHeaders);
-        request.Sign(ctx.Key);
+        request.Sign(ctx.Key!);

-        return await CreateSession(request, args.Context!);
+        return await CreateSession(request, args.Context!).ConfigureAwait(false);
    }

    internal async Task<SessionToken> CreateSession(CreateRequest request, Context ctx)
    {
        var response = await _sessionServiceClient!.CreateAsync(request, null, ctx.Deadline, ctx.CancellationToken);
-        
+
        Verifier.CheckResponse(response);
-        
+
        return new SessionToken
        {
            Body = new SessionToken.Types.Body
--- a/src/FrostFS.SDK.ClientV2/Services/Shared/ApeManagerServiceProvider.cs
+++ b/src/FrostFS.SDK.ClientV2/Services/Shared/ApeManagerServiceProvider.cs
@ -5,12 +5,12 @@ using Frostfs.V2.Apemanager;

 namespace FrostFS.SDK.ClientV2;

-internal class ApeManagerServiceProvider : ContextAccessor
-{  
+internal sealed class ApeManagerServiceProvider : ContextAccessor
+{
    private readonly APEManagerService.APEManagerServiceClient? _apeManagerServiceClient;

    internal ApeManagerServiceProvider(APEManagerService.APEManagerServiceClient? apeManagerServiceClient, ClientEnvironment context)
-        : base (context)
+        : base(context)
    {
        _apeManagerServiceClient = apeManagerServiceClient;
    }
@ -18,12 +18,16 @@ internal class ApeManagerServiceProvider : ContextAccessor
    internal async Task<byte[]> AddChainAsync(PrmApeChainAdd args)
    {
        var ctx = args.Context!;
+        ctx.Key ??= Context.Key?.ECDsaKey;
+
+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));

        AddChainRequest request = new()
        {
            Body = new()
            {
-                Chain = new () { Raw = args.Chain.GetRaw() },
+                Chain = new() { Raw = args.Chain.GetRaw() },
                Target = args.Target.GetChainTarget()
            }
        };
@ -41,6 +45,11 @@ internal class ApeManagerServiceProvider : ContextAccessor
    internal async Task RemoveChainAsync(PrmApeChainRemove args)
    {
        var ctx = args.Context!;
+        ctx.Key ??= Context.Key?.ECDsaKey;
+
+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));
+
        RemoveChainRequest request = new()
        {
            Body = new()
@ -61,6 +70,11 @@ internal class ApeManagerServiceProvider : ContextAccessor
    internal async Task<Chain[]> ListChainAsync(PrmApeChainList args)
    {
        var ctx = args.Context!;
+        ctx.Key ??= Context.Key?.ECDsaKey;
+
+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));
+
        ListChainsRequest request = new()
        {
            Body = new()
--- a/src/FrostFS.SDK.ClientV2/Services/Shared/SessionProvider.cs
+++ b/src/FrostFS.SDK.ClientV2/Services/Shared/SessionProvider.cs
@ -7,13 +7,14 @@ internal interface ISessionProvider
    ValueTask<Session.SessionToken> GetOrCreateSession(ISessionToken args, Context ctx);
 }

-internal class SessionProvider(ClientEnvironment env)
-{ 
+internal sealed class SessionProvider(ClientEnvironment env)
+{
    public async ValueTask<Session.SessionToken> GetOrCreateSession(ISessionToken args, Context ctx)
    {
        if (args.SessionToken is null)
-        { 
-            return await env.Client.CreateSessionInternalAsync(new PrmSessionCreate(uint.MaxValue) { Context = ctx });
+        {
+            return await env.Client.CreateSessionInternalAsync(new PrmSessionCreate(uint.MaxValue) { Context = ctx })
+                .ConfigureAwait(false);
        }

        return new Session.SessionToken().Deserialize(args.SessionToken.Token);
--- a/src/FrostFS.SDK.ClientV2/Tools/ClientEnvironment.cs
+++ b/src/FrostFS.SDK.ClientV2/Tools/ClientEnvironment.cs
@ -6,9 +6,9 @@ using Grpc.Net.Client;

 namespace FrostFS.SDK.ClientV2;

-public class ClientEnvironment(Client client, ECDsa? key, FrostFsOwner? owner, GrpcChannel channel, FrostFsVersion version) : IDisposable
+public class ClientEnvironment(FrostFSClient client, ECDsa? key, FrostFsOwner? owner, GrpcChannel channel, FrostFsVersion version) : IDisposable
 {
-    private ArrayPool<byte> _arrayPool;
+    private ArrayPool<byte>? _arrayPool;

    internal FrostFsOwner? Owner { get; } = owner;

@ -18,7 +18,7 @@ public class ClientEnvironment(Client client, ECDsa? key, FrostFsOwner? owner, G

    internal NetworkSettings? NetworkSettings { get; set; }

-    internal Client Client { get; } = client;
+    internal FrostFSClient Client { get; } = client;

    internal ClientKey? Key { get; } = key != null ? new ClientKey(key) : null;

@ -28,7 +28,7 @@ public class ClientEnvironment(Client client, ECDsa? key, FrostFsOwner? owner, G
    internal ArrayPool<byte> GetArrayPool(int size)
    {
        _arrayPool ??= ArrayPool<byte>.Create(size, 256);
-        
+
        return _arrayPool;
    }

--- a/src/FrostFS.SDK.ClientV2/Tools/Object.cs
+++ b/src/FrostFS.SDK.ClientV2/Tools/Object.cs
@ -1,57 +0,0 @@
-using System;
-using System.Collections.Generic;
-
-namespace FrostFS.SDK.ClientV2.Extensions;
-
-public static class ObjectExtensions
-{
-    public static FrostFsObject SetPayloadLength(this FrostFsObject obj, ulong length)
-    {
-        obj.Header.PayloadLength = length;
-        return obj;
-    }
-
-    public static FrostFsObject SetPayload(this FrostFsObject obj, byte[] bytes)
-    {
-        obj.Payload = bytes;
-        return obj;
-    }
-
-    public static FrostFsObject AddAttribute(this FrostFsObject obj, string key, string value)
-    {
-        obj.AddAttribute(new FrostFsAttribute(key, value));
-        return obj;
-    }
-
-    public static FrostFsObject AddAttribute(this FrostFsObject obj, FrostFsAttribute attribute)
-    {
-        obj.Header.Attributes.Add(attribute);
-        return obj;
-    }
-
-    public static FrostFsObject AddAttributes(this FrostFsObject obj, IEnumerable<FrostFsAttribute> attributes)
-    {
-        obj.Header.Attributes.AddRange(attributes);
-        return obj;
-    }
-
-    public static FrostFsObject SetSplit(this FrostFsObject obj, FrostFsSplit? split)
-    {
-        obj.Header.Split = split;
-        return obj;
-    }
-
-    public static FrostFsLinkObject AddChildren(this FrostFsLinkObject linkObject, IEnumerable<FrostFsObjectId> objectIds)
-    {
-        linkObject.Header.Split!.Children.AddRange(objectIds);
-        return linkObject;
-    }
-
-    public static FrostFsObject CalculateObjectId(this FrostFsObject obj)
-    {
-        if (obj.Header == null)
-            throw new MissingFieldException("Header cannot be null");
-
-        return obj;
-    }
-}
--- a/src/FrostFS.SDK.ClientV2/Tools/ObjectReader.cs
+++ b/src/FrostFS.SDK.ClientV2/Tools/ObjectReader.cs
@ -1,30 +1,30 @@
 using System;
+using System.Threading;
 using System.Threading.Tasks;

+using FrostFS.Object;
+
 using Grpc.Core;

-using FrostFS.Object;
-using System.Threading;
-
 namespace FrostFS.SDK.ClientV2;

-public class ObjectReader(AsyncServerStreamingCall<GetResponse> call) : IObjectReader
+public sealed class ObjectReader(AsyncServerStreamingCall<GetResponse> call) : IObjectReader
 {
-    private bool disposed = false;
+    private bool disposed;

    public AsyncServerStreamingCall<GetResponse> Call { get; private set; } = call;

    internal async Task<Object.Object> ReadHeader()
    {
-        if (!await Call.ResponseStream.MoveNext())
+        if (!await Call.ResponseStream.MoveNext().ConfigureAwait(false))
            throw new InvalidOperationException("unexpected end of stream");
-        
+
        var response = Call.ResponseStream.Current;
        Verifier.CheckResponse(response);
-        
+
        if (response.Body.ObjectPartCase != GetResponse.Types.Body.ObjectPartOneofCase.Init)
            throw new InvalidOperationException("unexpected message type");
-        
+
        return new Object.Object
        {
            ObjectId = response.Body.Init.ObjectId,
@ -34,12 +34,12 @@ public class ObjectReader(AsyncServerStreamingCall<GetResponse> call) : IObjectR

    public async Task<ReadOnlyMemory<byte>?> ReadChunk(CancellationToken cancellationToken = default)
    {
-        if (!await Call.ResponseStream.MoveNext(cancellationToken))
+        if (!await Call.ResponseStream.MoveNext(cancellationToken).ConfigureAwait(false))
            return null;
-        
+
        var response = Call.ResponseStream.Current;
        Verifier.CheckResponse(response);
-        
+
        if (response.Body.ObjectPartCase != GetResponse.Types.Body.ObjectPartOneofCase.Chunk)
            throw new InvalidOperationException("unexpected message type");

--- a/src/FrostFS.SDK.ClientV2/Tools/ObjectStreamer.cs
+++ b/src/FrostFS.SDK.ClientV2/Tools/ObjectStreamer.cs
@ -1,13 +1,13 @@
 using System;
 using System.Threading.Tasks;

-using Grpc.Core;
-
 using FrostFS.Object;

+using Grpc.Core;
+
 namespace FrostFS.SDK.ClientV2;

-internal class ObjectStreamer(AsyncClientStreamingCall<PutRequest, PutResponse> call) : IDisposable
+internal sealed class ObjectStreamer(AsyncClientStreamingCall<PutRequest, PutResponse> call) : IDisposable
 {
    public AsyncClientStreamingCall<PutRequest, PutResponse> Call { get; private set; } = call;

@ -18,14 +18,14 @@ internal class ObjectStreamer(AsyncClientStreamingCall<PutRequest, PutResponse>
            throw new ArgumentNullException(nameof(request));
        }

-        await Call.RequestStream.WriteAsync(request);
+        await Call.RequestStream.WriteAsync(request).ConfigureAwait(false);
    }

    public async Task<PutResponse> Close()
    {
-        await Call.RequestStream.CompleteAsync();
-        
-        return await Call.ResponseAsync;
+        await Call.RequestStream.CompleteAsync().ConfigureAwait(false);
+
+        return await Call.ResponseAsync.ConfigureAwait(false);
    }

    public void Dispose()
--- a/src/FrostFS.SDK.ClientV2/Tools/ObjectTools.cs
+++ b/src/FrostFS.SDK.ClientV2/Tools/ObjectTools.cs
@ -1,35 +1,35 @@
 using System.Linq;

-using Google.Protobuf;
-
 using FrostFS.Object;
 using FrostFS.Refs;
 using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.Cryptography;

+using Google.Protobuf;
+
 namespace FrostFS.SDK.ClientV2;

-internal class ObjectTools
+internal static class ObjectTools
 {
    internal static FrostFsObjectId CalculateObjectId(FrostFsObjectHeader header, Context ctx)
-    { 
+    {
        var grpcHeader = CreateHeader(header, [], ctx);

        if (header.Split != null)
            SetSplitValues(grpcHeader, header.Split, ctx);

-        return new ObjectID { Value = grpcHeader.Sha256() }.ToModel();        
+        return new ObjectID { Value = grpcHeader.Sha256() }.ToModel();
    }

-    internal static  Object.Object CreateObject(FrostFsObject @object, Context ctx)
+    internal static Object.Object CreateObject(FrostFsObject @object, Context ctx)
    {
        @object.Header.OwnerId ??= ctx.OwnerId;
        @object.Header.Version ??= ctx.Version;

        var grpcHeader = @object.Header.GetHeader();
-              
-        grpcHeader.PayloadLength = (ulong)@object.Payload.Length;
-        grpcHeader.PayloadHash = Sha256Checksum(@object.Payload);
+
+        grpcHeader.PayloadLength = (ulong)@object.SingleObjectPayload.Length;
+        grpcHeader.PayloadHash = Sha256Checksum(@object.SingleObjectPayload);

        var split = @object.Header.Split;
        if (split != null)
@ -41,15 +41,15 @@ internal class ObjectTools
        {
            Header = grpcHeader,
            ObjectId = new ObjectID { Value = grpcHeader.Sha256() },
-            Payload = ByteString.CopyFrom(@object.Payload)
+            Payload = ByteString.CopyFrom(@object.SingleObjectPayload)
        };

-        obj.Signature = new Refs.Signature
+        obj.Signature = new Signature
        {
            Key = ctx.GetPublicKeyCache(),
-            Sign = ByteString.CopyFrom(ctx.Key.SignData(obj.ObjectId.ToByteArray())),
-        };        
-      
+            Sign = ByteString.CopyFrom(ctx.Key!.SignData(obj.ObjectId.ToByteArray())),
+        };
+
        return obj;
    }

@ -58,6 +58,9 @@ internal class ObjectTools
        if (split == null)
            return;

+        if (ctx.Key == null)
+            throw new InvalidObjectException(nameof(ctx.Key));
+
        grpcHeader.Split = new Header.Types.Split
        {
            SplitId = split.SplitId?.GetSplitId()
@ -72,13 +75,11 @@ internal class ObjectTools

            grpcHeader.Split.Parent = new ObjectID { Value = grpcParentHeader.Sha256() };
            grpcHeader.Split.ParentHeader = grpcParentHeader;
-            grpcHeader.Split.ParentSignature = new Refs.Signature
+            grpcHeader.Split.ParentSignature = new Signature
            {
                Key = ctx.GetPublicKeyCache(),
                Sign = ByteString.CopyFrom(ctx.Key.SignData(grpcHeader.Split.Parent.ToByteArray())),
            };
-
-            split.Parent = grpcHeader.Split.Parent.ToModel();
        }

        grpcHeader.Split.Previous = split.Previous?.ToMessage();
@ -90,10 +91,10 @@ internal class ObjectTools
        header.Version ??= ctx.Version;

        var grpcHeader = header.GetHeader();
-       
+
        if (payload != null) //  && payload.Length > 0    
            grpcHeader.PayloadHash = Sha256Checksum(payload);
-       
+
        return grpcHeader;
    }

--- a/src/FrostFS.SDK.ClientV2/Tools/Range.cs
+++ b/src/FrostFS.SDK.ClientV2/Tools/Range.cs
@ -25,7 +25,7 @@ namespace System
        {
            if (value < 0)
                throw new ArgumentOutOfRangeException(nameof(value), "value must be non-negative");
-            
+
            if (fromEnd)
                _value = ~value;
            else
@ -51,7 +51,7 @@ namespace System
        {
            if (value < 0)
                throw new ArgumentOutOfRangeException(nameof(value), "value must be non-negative");
-            
+
            return new Index(value);
        }

@ -62,7 +62,7 @@ namespace System
        {
            if (value < 0)
                throw new ArgumentOutOfRangeException(nameof(value), "value must be non-negative");
-            
+
            return new Index(~value);
        }

@ -119,9 +119,9 @@ namespace System
        public override string ToString()
        {
            if (IsFromEnd)
-                return "^" + ((uint)Value).ToString();
+                return $"^{(uint)Value}";

-            return ((uint)Value).ToString();
+            return $"{(uint)Value}";
        }
    }

@ -189,7 +189,7 @@ namespace System
        {
            int start;
            var startIndex = Start;
-            
+
            if (startIndex.IsFromEnd)
                start = length - startIndex.Value;
            else
@ -205,7 +205,7 @@ namespace System

            if ((uint)end > (uint)length || (uint)start > (uint)end)
                throw new ArgumentOutOfRangeException(nameof(length));
-            
+
            return (start, end - start);
        }
    }
@ -222,7 +222,7 @@ namespace System.Runtime.CompilerServices
        {
            if (array == null)
                throw new ArgumentNullException(nameof(array));
-            
+
            (int offset, int length) = range.GetOffsetAndLength(array.Length);

            if (default(T) != null || typeof(T[]) == array.GetType())
@ -231,7 +231,7 @@ namespace System.Runtime.CompilerServices

                if (length == 0)
                    return [];
-                
+
                var dest = new T[length];
                Array.Copy(array, offset, dest, 0, length);
                return dest;
--- a/src/FrostFS.SDK.ClientV2/Tools/RequestConstructor.cs
+++ b/src/FrostFS.SDK.ClientV2/Tools/RequestConstructor.cs
@ -1,3 +1,4 @@
+using System;
 using System.Collections.Specialized;
 using System.Linq;
 using System.Security.Cryptography;
@ -12,9 +13,14 @@ namespace FrostFS.SDK.ClientV2;

 public static class RequestConstructor
 {
-    public static void AddMetaHeader(this IRequest request, NameValueCollection? xHeaders, Session.SessionToken? sessionToken = null)
+    public static void AddMetaHeader(this IRequest request,
+        NameValueCollection? xHeaders,
+        SessionToken? sessionToken = null)
    {
-        if (request.MetaHeader is not null) 
+        if (request is null)
+            throw new ArgumentNullException(nameof(request));
+
+        if (request.MetaHeader is not null)
            return;

        request.MetaHeader = MetaHeader.Default().ToMessage();
@ -28,11 +34,21 @@ public static class RequestConstructor
                     (k, v) => new XHeader { Key = k, Value = v }));
    }

-    public static void CreateObjectTokenContext(this Session.SessionToken sessionToken, 
+    public static void CreateObjectTokenContext(this SessionToken sessionToken,
        Address address,
        ObjectSessionContext.Types.Verb verb,
        ECDsa key)
    {
+        if (sessionToken is null)
+        {
+            throw new ArgumentNullException(nameof(sessionToken));
+        }
+
+        if (address is null)
+        {
+            throw new ArgumentNullException(nameof(address));
+        }
+
        if (sessionToken.Body.Object?.Target != null)
            return;

@ -52,7 +68,7 @@ public static class RequestConstructor
        sessionToken.Signature = key.SignMessagePart(sessionToken.Body);
    }

-    public static void CreateContainerTokenContext(this Session.SessionToken sessionToken,
+    internal static void CreateContainerTokenContext(this SessionToken sessionToken,
       ContainerID? containerId,
       ContainerSessionContext.Types.Verb verb,
       ECDsa key,
@ -61,7 +77,7 @@ public static class RequestConstructor
        if (sessionToken.Body.Container?.ContainerId != null)
            return;

-        sessionToken.Body.Container = new (){ Verb = verb };
+        sessionToken.Body.Container = new() { Verb = verb };

        if (containerId != null)
            sessionToken.Body.Container.ContainerId = containerId;
@ -69,7 +85,7 @@ public static class RequestConstructor
            sessionToken.Body.Container.Wildcard = true;

        sessionToken.Body.SessionKey = publicKey;
-    
+
        sessionToken.Signature = key.SignMessagePart(sessionToken.Body);
    }
 }
--- a/src/FrostFS.SDK.ClientV2/Tools/RequestSigner.cs
+++ b/src/FrostFS.SDK.ClientV2/Tools/RequestSigner.cs
@ -18,35 +18,45 @@ namespace FrostFS.SDK.ClientV2;

 public static class RequestSigner
 {
-    public const int RFC6979SignatureSize = 64;
+    internal const int RFC6979SignatureSize = 64;

-    public static byte[] SignRFC6979(this ECDsa key, byte[] data)
+    internal static byte[] SignRFC6979(this ECDsa key, byte[] data)
    {
+        if (key is null)
+        {
+            throw new ArgumentNullException(nameof(key));
+        }
+
+        if (data is null)
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+
        var digest = new Sha256Digest();
        var secp256R1 = SecNamedCurves.GetByName("secp256r1");
        var ecParameters = new ECDomainParameters(secp256R1.Curve, secp256R1.G, secp256R1.N);
        var privateKey = new ECPrivateKeyParameters(new BigInteger(1, key.PrivateKey()), ecParameters);
        var signer = new ECDsaSigner(new HMacDsaKCalculator(digest));
        var hash = new byte[digest.GetDigestSize()];
-    
+
        digest.BlockUpdate(data, 0, data.Length);
        digest.DoFinal(hash, 0);
        signer.Init(true, privateKey);
-    
+
        var rs = signer.GenerateSignature(hash);
        var signature = new byte[RFC6979SignatureSize];
        var rbytes = rs[0].ToByteArrayUnsigned();
        var sbytes = rs[1].ToByteArrayUnsigned();
        var index = RFC6979SignatureSize / 2 - rbytes.Length;
-    
+
        rbytes.CopyTo(signature, index);
        index = RFC6979SignatureSize - sbytes.Length;
        sbytes.CopyTo(signature, index);
-    
+
        return signature;
    }

-    public static SignatureRFC6979 SignRFC6979(this ECDsa key, IMessage message)
+    internal static SignatureRFC6979 SignRFC6979(this ECDsa key, IMessage message)
    {
        return new SignatureRFC6979
        {
@ -54,8 +64,8 @@ public static class RequestSigner
            Sign = ByteString.CopyFrom(key.SignRFC6979(message.ToByteArray())),
        };
    }
-    
-    public static SignatureRFC6979 SignRFC6979(this ECDsa key, ByteString data)
+
+    internal static SignatureRFC6979 SignRFC6979(this ECDsa key, ByteString data)
    {
        return new SignatureRFC6979
        {
@ -74,7 +84,7 @@ public static class RequestSigner
        return hash;
    }

-    public static Signature SignMessagePart(this ECDsa key, IMessage? data)
+    internal static Signature SignMessagePart(this ECDsa key, IMessage? data)
    {
        var data2Sign = data is null ? [] : data.ToByteArray();
        var sig = new Signature
@ -86,7 +96,7 @@ public static class RequestSigner
        return sig;
    }

-    public static void Sign(this IVerifiableMessage message, ECDsa key)
+    internal static void Sign(this IVerifiableMessage message, ECDsa key)
    {
        var meta = message.GetMetaHeader();
        IVerificationHeader verify = message switch
@ -95,17 +105,17 @@ public static class RequestSigner
            IResponse => new ResponseVerificationHeader(),
            _ => throw new InvalidOperationException("Unsupported message type")
        };
-      
+
        var verifyOrigin = message.GetVerificationHeader();
-      
+
        if (verifyOrigin is null)
            verify.BodySignature = key.SignMessagePart(message.GetBody());
-        else 
+        else
            verify.SetOrigin(verifyOrigin);
-        
+
        verify.MetaSignature = key.SignMessagePart(meta);
        verify.OriginSignature = key.SignMessagePart(verifyOrigin);
-        
+
        message.SetVerificationHeader(verify);
    }
 }
--- a/src/FrostFS.SDK.ClientV2/Tools/SearchReader.cs
+++ b/src/FrostFS.SDK.ClientV2/Tools/SearchReader.cs
@ -11,17 +11,17 @@ using Grpc.Core;

 namespace FrostFS.SDK.ClientV2;

-internal class SearchReader(AsyncServerStreamingCall<SearchResponse> call) : IDisposable
+internal sealed class SearchReader(AsyncServerStreamingCall<SearchResponse> call) : IDisposable
 {
    public AsyncServerStreamingCall<SearchResponse> Call { get; private set; } = call;

    public async Task<List<ObjectID>?> Read(CancellationToken cancellationToken)
    {
-        if (!await Call.ResponseStream.MoveNext(cancellationToken))
+        if (!await Call.ResponseStream.MoveNext(cancellationToken).ConfigureAwait(false))
            return null;
-       
+
        var response = Call.ResponseStream.Current;
-        
+
        Verifier.CheckResponse(response);

        return response.Body?.IdList.ToList();
--- a/src/FrostFS.SDK.ClientV2/Tools/Verifier.cs
+++ b/src/FrostFS.SDK.ClientV2/Tools/Verifier.cs
@ -45,7 +45,7 @@ public static class Verifier
        var ecParameters = new ECDomainParameters(secp256R1.Curve, secp256R1.G, secp256R1.N);
        var bcPublicKey = new ECPublicKeyParameters(secp256R1.Curve.DecodePoint(publicKey), ecParameters);
        var hash = new byte[digest.GetDigestSize()];
-      
+
        digest.BlockUpdate(data, 0, data.Length);
        digest.DoFinal(hash, 0);
        signer.Init(false, bcPublicKey);
@ -55,11 +55,25 @@ public static class Verifier

    public static bool VerifyRFC6979(this SignatureRFC6979 signature, IMessage message)
    {
+        if (signature is null)
+        {
+            throw new ArgumentNullException(nameof(signature));
+        }
+
        return signature.Key.ToByteArray().VerifyRFC6979(message.ToByteArray(), signature.Sign.ToByteArray());
    }

    public static bool VerifyData(this ECDsa key, byte[] data, byte[] sig)
    {
+        if (key is null)
+            throw new ArgumentNullException(nameof(key));
+
+        if (data is null)
+            throw new ArgumentNullException(nameof(data));
+
+        if (sig is null)
+            throw new ArgumentNullException(nameof(sig));
+
        return key.VerifyHash(data.Sha512(), sig[1..]);
    }

@ -70,36 +84,41 @@ public static class Verifier

        using var key = sig.Key.ToByteArray().LoadPublicKey();
        var data2Verify = data is null ? [] : data.ToByteArray();
-        
+
        return key.VerifyData(data2Verify, sig.Sign.ToByteArray());
    }

-    public static bool VerifyMatryoskaLevel(IMessage body, IMetaHeader meta, IVerificationHeader verification)
+    internal static bool VerifyMatryoskaLevel(IMessage body, IMetaHeader meta, IVerificationHeader verification)
    {
-        if (!verification.MetaSignature.VerifyMessagePart(meta)) 
+        if (!verification.MetaSignature.VerifyMessagePart(meta))
            return false;
-        
+
        var origin = verification.GetOrigin();
-      
-        if (!verification.OriginSignature.VerifyMessagePart(origin)) 
+
+        if (!verification.OriginSignature.VerifyMessagePart(origin))
            return false;
-      
+
        if (origin is null)
            return verification.BodySignature.VerifyMessagePart(body);
-        
+
        return verification.BodySignature is null && VerifyMatryoskaLevel(body, meta.GetOrigin(), origin);
    }

    public static bool Verify(this IVerifiableMessage message)
    {
+        if (message is null)
+        {
+            throw new ArgumentNullException(nameof(message));
+        }
+
        return VerifyMatryoskaLevel(message.GetBody(), message.GetMetaHeader(), message.GetVerificationHeader());
    }

-    public static void CheckResponse(IResponse resp)
+    internal static void CheckResponse(IResponse resp)
    {
        if (!resp.Verify())
            throw new FormatException($"invalid response, type={resp.GetType()}");
-     
+
        var status = resp.MetaHeader.Status.ToModel();

        if (status != null && !status.IsSuccess)
@ -112,6 +131,11 @@ public static class Verifier
    /// <param name="request">Created by SDK request to gRpc proxy</param>
    public static void CheckRequest(IRequest request)
    {
+        if (request is null)
+        {
+            throw new ArgumentNullException(nameof(request));
+        }
+
        if (!request.Verify())
            throw new FormatException($"invalid response, type={request.GetType()}");
    }
--- a/src/FrostFS.SDK.ClientV2/Ростелеком.txt
+++ b/src/FrostFS.SDK.ClientV2/Ростелеком.txt
@ -0,0 +1,8 @@
+Для возврата денег потребуются документы:
+1. Заполненное заявление
+Форму заявления можно скачать с сайта
+Шаблон заявления скачайте на сайте rt.ru. Внизу страницы перейдите в Договоры и соглашения -> «Бланки и заявления»
+2. Скан-фото паспорта владельца договора (2, 3, 5 страница: кем и когда выдан, адрес регистрации)
+3. Реквизиты счета владельца, выданные банком, на которые будет выполнен возврат
+4. Чек об оплате
+Сканы документов должны быть хорошо читаемые
--- a/src/FrostFS.SDK.Cryptography/Base58.cs
+++ b/src/FrostFS.SDK.Cryptography/Base58.cs
@ -13,17 +13,17 @@ public static class Base58
    {
        if (input is null)
            throw new ArgumentNullException(nameof(input));
-        
+
        byte[] buffer = Decode(input);

-        if (buffer.Length < 4) 
+        if (buffer.Length < 4)
            throw new FormatException();
-        
+
        byte[] checksum = buffer[0..(buffer.Length - 4)].Sha256().Sha256();

        if (!buffer.AsSpan(buffer.Length - 4).SequenceEqual(checksum[..4].AsSpan()))
            throw new FormatException();
-       
+
        var ret = buffer[..^4];
        Array.Clear(buffer, 0, buffer.Length);
        return ret;
@ -34,7 +34,7 @@ public static class Base58
        byte[] checksum = data.ToArray().Sha256().Sha256();
        Span<byte> buffer = stackalloc byte[data.Length + 4];
        data.CopyTo(buffer);
-        
+
        checksum[..4].AsSpan().CopyTo(buffer[data.Length..]);
        var ret = Encode(buffer);
        buffer.Clear();
@ -44,6 +44,9 @@ public static class Base58

    public static byte[] Decode(string input)
    {
+        if (input == null)
+            throw new ArgumentNullException(nameof(input));
+
        // Decode Base58 string to BigInteger 
        var bi = BigInteger.Zero;
        for (int i = 0; i < input.Length; i++)
@ -61,7 +64,7 @@ public static class Base58
        if (bi.IsZero)
            return leadingZeros;

-        var bytesBigEndian = bi.ToByteArray().Reverse();
+        var bytesBigEndian = bi.ToByteArray().Reverse().ToArray();

        var firstNonZeroIndex = 0;

--- a/src/FrostFS.SDK.Cryptography/Extentions.cs
+++ b/src/FrostFS.SDK.Cryptography/Extentions.cs
@ -1,17 +1,19 @@
-using Google.Protobuf;
-using Org.BouncyCastle.Crypto.Digests;
 using System.Security.Cryptography;
 using System.Threading;

+using Google.Protobuf;
+
+using Org.BouncyCastle.Crypto.Digests;
+
 namespace FrostFS.SDK.Cryptography;

 public static class Extentions
 {
    private static readonly SHA256 _sha256 = SHA256.Create();
-    private static SpinLock _spinlockSha256 = new();
+    private static SpinLock _spinlockSha256;

    private static readonly SHA512 _sha512 = SHA512.Create();
-    private static SpinLock _spinlockSha512 = new();
+    private static SpinLock _spinlockSha512;

    internal static byte[] RIPEMD160(this byte[] value)
    {
@ -22,7 +24,7 @@ public static class Extentions
        digest.DoFinal(hash, 0);
        return hash;
    }
-    
+
    public static ByteString Sha256(this IMessage data)
    {
        return ByteString.CopyFrom(data.ToByteArray().Sha256());
--- a/src/FrostFS.SDK.Cryptography/FrostFS.SDK.Cryptography.csproj
+++ b/src/FrostFS.SDK.Cryptography/FrostFS.SDK.Cryptography.csproj
@ -13,6 +13,10 @@
  <ItemGroup>
    <PackageReference Include="BouncyCastle.Cryptography" Version="2.4.0" />
    <PackageReference Include="Google.Protobuf" Version="3.27.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="8.0.0">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
    <PackageReference Include="System.Memory" Version="4.5.5" />
  </ItemGroup>

--- a/src/FrostFS.SDK.Cryptography/Key.cs
+++ b/src/FrostFS.SDK.Cryptography/Key.cs
@ -20,6 +20,9 @@ public static class KeyExtension

    public static byte[] Compress(this byte[] publicKey)
    {
+        if (publicKey == null)
+            throw new ArgumentNullException(nameof(publicKey));
+
        if (publicKey.Length != UncompressedPublicKeyLength)
            throw new FormatException(
                $"{nameof(Compress)} argument isn't uncompressed public key. " +
@ -34,6 +37,9 @@ public static class KeyExtension

    public static byte[] Decompress(this byte[] publicKey)
    {
+        if (publicKey == null)
+            throw new ArgumentNullException(nameof(publicKey));
+
        if (publicKey.Length != CompressedPublicKeyLength)
            throw new FormatException(
                $"{nameof(Decompress)} argument isn't compressed public key. " +
@ -64,6 +70,9 @@ public static class KeyExtension

    public static byte[] GetScriptHash(this byte[] publicKey)
    {
+        if (publicKey == null)
+            throw new ArgumentNullException(nameof(publicKey));
+
        var script = publicKey.CreateSignatureRedeemScript();
        return script.Sha256().RIPEMD160();
    }
@ -79,14 +88,14 @@ public static class KeyExtension

    private static byte[] GetPrivateKeyFromWIF(string wif)
    {
-        if (wif == null) 
+        if (wif == null)
            throw new ArgumentNullException(nameof(wif));
-        
+
        var data = wif.Base58CheckDecode();
-        
+
        if (data.Length != 34 || data[0] != 0x80 || data[33] != 0x01)
            throw new FormatException();
-      
+
        var privateKey = new byte[32];
        Buffer.BlockCopy(data, 1, privateKey, 0, privateKey.Length);
        Array.Clear(data, 0, data.Length);
@ -100,6 +109,9 @@ public static class KeyExtension

    public static string PublicKeyToAddress(this byte[] publicKey)
    {
+        if (publicKey == null)
+            throw new ArgumentNullException(nameof(publicKey));
+
        if (publicKey.Length != CompressedPublicKeyLength)
            throw new FormatException(
                nameof(publicKey) +
@ -112,6 +124,9 @@ public static class KeyExtension

    public static byte[] PublicKey(this ECDsa key)
    {
+        if (key == null)
+            throw new ArgumentNullException(nameof(key));
+
        var param = key.ExportParameters(false);
        var pubkey = new byte[33];
        var pos = 33 - param.Q.X.Length;
@ -127,6 +142,9 @@ public static class KeyExtension

    public static byte[] PrivateKey(this ECDsa key)
    {
+        if (key == null)
+            throw new ArgumentNullException(nameof(key));
+
        return key.ExportParameters(true).D;
    }

@ -153,7 +171,7 @@ public static class KeyExtension
    public static ECDsa LoadWif(this string wif)
    {
        var privateKey = GetPrivateKeyFromWIF(wif);
-        
+
        return LoadPrivateKey(privateKey);
    }

--- a/src/FrostFS.SDK.Cryptography/Murmur3_128.cs
+++ b/src/FrostFS.SDK.Cryptography/Murmur3_128.cs
@ -28,7 +28,7 @@ internal class Murmur3_128 : HashAlgorithm
        length += cbSize;
        int remainder = cbSize & 15;
        int alignedLength = ibStart + (cbSize - remainder);
-       
+
        for (int i = ibStart; i < alignedLength; i += 16)
        {
            ulong k1 = BinaryPrimitives.ReadUInt64LittleEndian(array.AsSpan(i));
@ -50,7 +50,7 @@ internal class Murmur3_128 : HashAlgorithm
            h2 += h1;
            h2 = h2 * m + n2;
        }
-    
+
        if (remainder > 0)
        {
            ulong k1 = 0, k2 = 0;
@ -101,7 +101,7 @@ internal class Murmur3_128 : HashAlgorithm
        h2 = Fimix64(h2);
        h1 += h2;
        h2 += h1;
-        
+
        return BitConverter.GetBytes(h1);
    }

--- a/src/FrostFS.SDK.Cryptography/Range.cs
+++ b/src/FrostFS.SDK.Cryptography/Range.cs
@ -122,9 +122,9 @@ namespace System
        public override string ToString()
        {
            if (IsFromEnd)
-                return "^" + ((uint)Value).ToString();
+                return $"^{(uint)Value}";

-            return ((uint)Value).ToString();
+            return $"{(uint)Value}";
        }
    }

@ -140,7 +140,7 @@ namespace System
    /// <remarks>Construct a Range object using the start and end indexes.</remarks>
    /// <param name="start">Represent the inclusive start index of the range.</param>
    /// <param name="end">Represent the exclusive end index of the range.</param>
-    internal readonly struct Range (Index start, Index end) : IEquatable<Range>
+    internal readonly struct Range(Index start, Index end) : IEquatable<Range>
    {
        /// <summary>Represent the inclusive start index of the Range.</summary>
        public Index Start { get; } = start;
--- a/src/FrostFS.SDK.Cryptography/UUID.cs
+++ b/src/FrostFS.SDK.Cryptography/UUID.cs
@ -1,5 +1,6 @@
-using Google.Protobuf;
-using System;
+using System;
+
+using Google.Protobuf;

 namespace FrostFS.SDK.Cryptography;

@ -7,13 +8,16 @@ public static class UUIDExtension
 {
    public static Guid ToUuid(this ByteString id)
    {
+        if (id == null)
+            throw new ArgumentNullException(nameof(id));
+
        var bytes = id.ToByteArray();
-        
+
        var orderedBytes = GetGuidBytesDirectOrder(bytes);

        return new Guid(orderedBytes);
    }
-    
+
    /// <summary>
    /// Serializes Guid to binary representation in direct order bytes format
    /// </summary>
--- a/src/FrostFS.SDK.ProtosV2/Interfaces/IVerificationHeader.cs
+++ b/src/FrostFS.SDK.ProtosV2/Interfaces/IVerificationHeader.cs
@ -1,4 +1,5 @@
 using FrostFS.Refs;
+
 using Google.Protobuf;

 namespace FrostFS.Session;
--- a/src/FrostFS.SDK.ProtosV2/apemanager/Extension.Message.cs
+++ b/src/FrostFS.SDK.ProtosV2/apemanager/Extension.Message.cs
@ -1,7 +1,7 @@
-using Google.Protobuf;
-
-using FrostFS.Session;
 using FrostFS.SDK.ProtosV2.Interfaces;
+using FrostFS.Session;
+
+using Google.Protobuf;

 namespace Frostfs.V2.Apemanager;

--- a/src/FrostFS.SDK.ProtosV2/container/Extension.Message.cs
+++ b/src/FrostFS.SDK.ProtosV2/container/Extension.Message.cs
@ -1,7 +1,7 @@
-using Google.Protobuf;
-
-using FrostFS.Session;
 using FrostFS.SDK.ProtosV2.Interfaces;
+using FrostFS.Session;
+
+using Google.Protobuf;

 namespace FrostFS.Container;

--- a/src/FrostFS.SDK.ProtosV2/netmap/Extension.Message.cs
+++ b/src/FrostFS.SDK.ProtosV2/netmap/Extension.Message.cs
@ -1,5 +1,6 @@
 using FrostFS.SDK.ProtosV2.Interfaces;
 using FrostFS.Session;
+
 using Google.Protobuf;

 namespace FrostFS.Netmap;
--- a/src/FrostFS.SDK.ProtosV2/object/Extension.Message.cs
+++ b/src/FrostFS.SDK.ProtosV2/object/Extension.Message.cs
@ -1,6 +1,8 @@
 using System.Diagnostics;
+
 using FrostFS.SDK.ProtosV2.Interfaces;
 using FrostFS.Session;
+
 using Google.Protobuf;

 namespace FrostFS.Object
@ -117,7 +119,7 @@ namespace FrostFS.Object
        }
    }

-     public partial class PutSingleRequest : IRequest
+    public partial class PutSingleRequest : IRequest
    {
        IMetaHeader IVerifiableMessage.GetMetaHeader()
        {
--- a/src/FrostFS.SDK.ProtosV2/session/Extension.Message.cs
+++ b/src/FrostFS.SDK.ProtosV2/session/Extension.Message.cs
@ -1,4 +1,5 @@
 using FrostFS.SDK.ProtosV2.Interfaces;
+
 using Google.Protobuf;

 namespace FrostFS.Session;
--- a/src/FrostFS.SDK.Tests/ContainerTest.cs
+++ b/src/FrostFS.SDK.Tests/ContainerTest.cs
@ -1,12 +1,12 @@
 using FrostFS.SDK.ClientV2;
-using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.ClientV2.Interfaces;
-using FrostFS.SDK.ClientV2;
+using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.Cryptography;

-using Microsoft.Extensions.Options;
 using Google.Protobuf;

+using Microsoft.Extensions.Options;
+
 namespace FrostFS.SDK.Tests;

 public abstract class ContainerTestsBase
@ -34,7 +34,7 @@ public abstract class ContainerTestsBase

    protected IFrostFSClient GetClient()
    {
-        return ClientV2.Client.GetTestInstance(
+        return ClientV2.FrostFSClient.GetTestInstance(
            Settings,
            null,
            new NetworkMocker(this.key).GetMock().Object,
@ -45,17 +45,17 @@ public abstract class ContainerTestsBase
 }

 public class ContainerTest : ContainerTestsBase
-{   
+{
    [Fact]
    public async void CreateContainerTest()
    {
-        var param = new PrmContainerCreate(new FrostFsContainerInfo(BasicAcl.PublicRW, Mocker.PlacementPolicy));
+        var param = new PrmContainerCreate(new FrostFsContainerInfo(Mocker.PlacementPolicy));

        var result = await GetClient().CreateContainerAsync(param);

        Assert.NotNull(result);
-        Assert.NotNull(result.Value);
-        Assert.True(Base58.Encode(Mocker.ContainerGuid.ToBytes()) == result.Value);
+        Assert.NotNull(result.GetValue());
+        Assert.True(Base58.Encode(Mocker.ContainerGuid.ToBytes()) == result.GetValue());
    }

    [Fact]
@ -63,14 +63,11 @@ public class ContainerTest : ContainerTestsBase
    {
        var cid = new FrostFsContainerId(Base58.Encode(Mocker.ContainerGuid.ToBytes()));

-        Mocker.Acl = BasicAcl.PublicRO;
-
        var result = await GetClient().GetContainerAsync(new PrmContainerGet(cid));

        Assert.NotNull(result);
-        Assert.Equal(Mocker.Acl, result.BasicAcl);
        Assert.Equal(Mocker.ContainerGuid, result.Nonce);
-        Assert.Equal(0, Mocker.PlacementPolicy.CompareTo(result.PlacementPolicy));
+        Assert.Equal(Mocker.PlacementPolicy, result.PlacementPolicy);
        Assert.Equal(Mocker.Version.ToString(), result.Version!.ToString());
    }

@ -89,7 +86,7 @@ public class ContainerTest : ContainerTestsBase
        await foreach (var cid in result)
        {
            var val = Base58.Encode(ByteString.CopyFrom(Mocker.ContainerIds[i++]).ToByteArray());
-            Assert.Equal(val, cid.Value);
+            Assert.Equal(val, cid.GetValue());
        }

        Assert.Equal(3, i);
@ -106,7 +103,7 @@ public class ContainerTest : ContainerTestsBase
        Assert.Single(Mocker.Requests);

        var request = Mocker.Requests.First();
-        
-        Assert.Equal(cid.ToMessage(), request.Request.Body.ContainerId);        
+
+        Assert.Equal(cid.ToMessage(), request.Request.Body.ContainerId);
    }
 }
--- a/src/FrostFS.SDK.Tests/MetricsInterceptor.cs
+++ b/src/FrostFS.SDK.Tests/MetricsInterceptor.cs
@ -1,7 +1,7 @@
-using Grpc.Core;
-using Grpc.Core.Interceptors;
+using System.Diagnostics;

-using System.Diagnostics;
+using Grpc.Core;
+using Grpc.Core.Interceptors;

 namespace FrostFS.SDK.SmokeTests;

@ -21,12 +21,12 @@ public class MetricsInterceptor() : Interceptor
            call.GetTrailers,
            call.Dispose);
    }
-  
+
    private static async Task<TResponse> HandleUnaryResponse<TResponse>(AsyncUnaryCall<TResponse> call)
    {
        var watch = new Stopwatch();
        watch.Start();
-      
+
        var response = await call.ResponseAsync;

        watch.Stop();
@ -34,6 +34,6 @@ public class MetricsInterceptor() : Interceptor
        // Do something with call info
        // var elapsed = watch.ElapsedTicks * 1_000_000/Stopwatch.Frequency;

-        return response;    
+        return response;
    }
 }
--- a/src/FrostFS.SDK.Tests/Mocks/AsyncStreamReaderMock.cs
+++ b/src/FrostFS.SDK.Tests/Mocks/AsyncStreamReaderMock.cs
@ -20,7 +20,7 @@ public class AsyncStreamReaderMock(string key, FrostFsObjectHeader objectHeader)
        {
            var header = new Header
            {
-                ContainerId =  objectHeader.ContainerId.ToMessage(),
+                ContainerId = objectHeader.ContainerId.ToMessage(),
                PayloadLength = objectHeader.PayloadLength,
                Version = objectHeader.Version!.ToMessage(),
                OwnerId = objectHeader.OwnerId!.ToMessage()
--- a/src/FrostFS.SDK.Tests/Mocks/ClientStreamWriter.cs
+++ b/src/FrostFS.SDK.Tests/Mocks/ClientStreamWriter.cs
@ -1,6 +1,7 @@
-using Grpc.Core;
 using FrostFS.SDK.ProtosV2.Interfaces;

+using Grpc.Core;
+
 namespace FrostFS.SDK.Tests;

 public class ClientStreamWriter : IClientStreamWriter<IRequest>
@ -17,13 +18,13 @@ public class ClientStreamWriter : IClientStreamWriter<IRequest>
    public Task CompleteAsync()
    {
        CompletedTask = true;
-        return Task.CompletedTask;        
+        return Task.CompletedTask;
    }

    public Task WriteAsync(IRequest message)
    {
        Object.PutRequest pr = new((Object.PutRequest)message);
-        Messages.Add(pr);        
+        Messages.Add(pr);
        return Task.CompletedTask;
    }
 }
--- a/src/FrostFS.SDK.Tests/Mocks/ContainerServiceMocks/ContainerServiceBase.cs
+++ b/src/FrostFS.SDK.Tests/Mocks/ContainerServiceMocks/ContainerServiceBase.cs
@ -1,15 +1,17 @@
 using System.Security.Cryptography;
-using FrostFS.Container;
-using Moq;

+using FrostFS.Container;
+using FrostFS.Object;
+using FrostFS.SDK.ClientV2;
+using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.Cryptography;
 using FrostFS.Session;
+
 using Google.Protobuf;

-using FrostFS.SDK.ClientV2;
-using FrostFS.Object;
 using Grpc.Core;
-using FrostFS.SDK.ClientV2.Mappers.GRPC;
+
+using Moq;

 namespace FrostFS.SDK.Tests;

@ -18,11 +20,9 @@ public abstract class ServiceBase(string key)
    public string StringKey { get; private set; } = key;
    public ECDsa Key { get; private set; } = key.LoadWif();
    public FrostFsVersion Version { get; set; } = DefaultVersion;
-    public BasicAcl Acl { get; set; } = DefaultAcl;
    public FrostFsPlacementPolicy PlacementPolicy { get; set; } = DefaultPlacementPolicy;

    public static FrostFsVersion DefaultVersion { get; } = new(2, 13);
-    public static BasicAcl DefaultAcl { get; } = BasicAcl.PublicRW;
    public static FrostFsPlacementPolicy DefaultPlacementPolicy { get; } = new FrostFsPlacementPolicy(true, new FrostFsReplica(1));

    public Metadata Metadata { get; protected set; }
@ -61,23 +61,23 @@ public abstract class ServiceBase(string key)
    }

    public ResponseMetaHeader ResponseMetaHeader => new()
-        {
-            Version = Version.ToMessage(),
-            Epoch = 100,
-            Ttl = 1
-        };
+    {
+        Version = Version.ToMessage(),
+        Epoch = 100,
+        Ttl = 1
+    };
 }

-public abstract class ContainerServiceBase(string key) : ServiceBase (key)
+public abstract class ContainerServiceBase(string key) : ServiceBase(key)
 {
    public Guid ContainerGuid { get; set; } = Guid.NewGuid();
-   
+
    public abstract Mock<ContainerService.ContainerServiceClient> GetMock();
 }

-public abstract class ObjectServiceBase(string key) : ServiceBase (key)
+public abstract class ObjectServiceBase(string key) : ServiceBase(key)
 {
-    public abstract Mock<ObjectService.ObjectServiceClient> GetMock(); 
-    
+    public abstract Mock<ObjectService.ObjectServiceClient> GetMock();
+
    public Guid ContainerGuid { get; set; } = Guid.NewGuid();
 }
--- a/src/FrostFS.SDK.Tests/Mocks/ContainerServiceMocks/ContainerStub.cs
+++ b/src/FrostFS.SDK.Tests/Mocks/ContainerServiceMocks/ContainerStub.cs
@ -1,4 +1,5 @@
 using FrostFS.Container;
+
 using Moq;

 namespace FrostFS.SDK.Tests;
--- a/src/FrostFS.SDK.Tests/Mocks/ContainerServiceMocks/GetContainerMock.cs
+++ b/src/FrostFS.SDK.Tests/Mocks/ContainerServiceMocks/GetContainerMock.cs
@ -1,14 +1,15 @@
 using FrostFS.Container;
-using Google.Protobuf;
-using Grpc.Core;
-using Moq;
-
-using FrostFS.SDK.Cryptography;
-using FrostFS.SDK.ClientV2;
-
-using FrostFS.SDK.ClientV2.Mappers.GRPC;
-using FrostFS.Session;
 using FrostFS.Refs;
+using FrostFS.SDK.ClientV2;
+using FrostFS.SDK.ClientV2.Mappers.GRPC;
+using FrostFS.SDK.Cryptography;
+using FrostFS.Session;
+
+using Google.Protobuf;
+
+using Grpc.Core;
+
+using Moq;

 namespace FrostFS.SDK.Tests;

@ -67,8 +68,7 @@ public class ContainerMocker(string key) : ContainerServiceBase(key)
                {
                    Version = grpcVersion,
                    Nonce = ByteString.CopyFrom(ContainerGuid.ToBytes()),
-                    BasicAcl = (uint)Acl,
-                    PlacementPolicy = PlacementPolicy.ToMessage()
+                    PlacementPolicy = PlacementPolicy.GetPolicy()
                }
            },
            MetaHeader = ResponseMetaHeader
@ -78,10 +78,10 @@ public class ContainerMocker(string key) : ContainerServiceBase(key)

        var getNoContainerResponse = new GetResponse
        {
-            Body = new (),
+            Body = new(),
            MetaHeader = new ResponseMetaHeader
-            { 
-                Status = new Status.Status 
+            {
+                Status = new Status.Status
                {
                    Code = 3072,
                    Message = "container not found"
@ -107,7 +107,7 @@ public class ContainerMocker(string key) : ContainerServiceBase(key)
                            Task.FromResult(ResponseMetaData),
                            () => new Grpc.Core.Status(StatusCode.NotFound, string.Empty),
                            () => ResponseMetaData,
-                            () => { });    
+                            () => { });
                    }

                    return new AsyncUnaryCall<GetResponse>(
@ -115,7 +115,7 @@ public class ContainerMocker(string key) : ContainerServiceBase(key)
                        Task.FromResult(ResponseMetaData),
                        () => new Grpc.Core.Status(StatusCode.OK, string.Empty),
                        () => ResponseMetaData,
-                        () => { });                    
+                        () => { });
                });

        var listResponse = new ListResponse
--- a/src/FrostFS.SDK.Tests/Mocks/ContainerServiceMocks/RequestData.cs
+++ b/src/FrostFS.SDK.Tests/Mocks/ContainerServiceMocks/RequestData.cs
@ -9,4 +9,3 @@ public class RequestData<T>(T request, Metadata m, DateTime? dt, CancellationTok
    public DateTime? Deadline => dt;
    public CancellationToken CancellationToken => ct;
 }
-       
--- a/src/FrostFS.SDK.Tests/Mocks/NetworkMocker.cs
+++ b/src/FrostFS.SDK.Tests/Mocks/NetworkMocker.cs
@ -1,8 +1,11 @@
-using Moq;
 using FrostFS.Netmap;
-using Grpc.Core;
+
 using Google.Protobuf;

+using Grpc.Core;
+
+using Moq;
+
 namespace FrostFS.SDK.Tests;

 public class NetworkMocker(string key) : ServiceBase(key)
--- a/src/FrostFS.SDK.Tests/Mocks/ObjectMock.cs
+++ b/src/FrostFS.SDK.Tests/Mocks/ObjectMock.cs
@ -1,12 +1,16 @@
-using Google.Protobuf;
-using Grpc.Core;
-using Moq;
-using FrostFS.SDK.ClientV2;
-using FrostFS.Object;
-using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using System.Security.Cryptography;
+
+using FrostFS.Object;
+using FrostFS.SDK.ClientV2;
+using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.Cryptography;

+using Google.Protobuf;
+
+using Grpc.Core;
+
+using Moq;
+
 namespace FrostFS.SDK.Tests;

 public class ObjectMocker(string key) : ObjectServiceBase(key)
@ -183,7 +187,7 @@ public class ObjectMocker(string key) : ObjectServiceBase(key)
                        () => { });
                });
        }
-        
+
        return mock;
    }

@ -195,7 +199,7 @@ public class ObjectMocker(string key) : ObjectServiceBase(key)

    public List<byte[]>? ResultObjectIds { get; set; }

-    public ClientStreamWriter? ClientStreamWriter { get; private set; } = new ();
+    public ClientStreamWriter? ClientStreamWriter { get; private set; } = new();

    public List<PutSingleRequest> PutSingleRequests { get; private set; } = [];

--- a/src/FrostFS.SDK.Tests/Mocks/SessionMock.cs
+++ b/src/FrostFS.SDK.Tests/Mocks/SessionMock.cs
@ -1,6 +1,9 @@
 using FrostFS.Session;
+
 using Google.Protobuf;
+
 using Grpc.Core;
+
 using Moq;

 namespace FrostFS.SDK.Tests;
--- a/src/FrostFS.SDK.Tests/NetworkTest.cs
+++ b/src/FrostFS.SDK.Tests/NetworkTest.cs
@ -1,3 +1,5 @@
+using System.Security.Cryptography;
+
 using FrostFS.Netmap;
 using FrostFS.SDK.ClientV2;
 using FrostFS.SDK.ClientV2.Interfaces;
@ -8,8 +10,6 @@ using Google.Protobuf;

 using Microsoft.Extensions.Options;

-using System.Security.Cryptography;
-
 namespace FrostFS.SDK.Tests;

 public abstract class NetworkTestsBase
@ -40,7 +40,7 @@ public abstract class NetworkTestsBase

    protected IFrostFSClient GetClient()
    {
-        return ClientV2.Client.GetTestInstance(
+        return ClientV2.FrostFSClient.GetTestInstance(
            Settings,
            null,
            Mocker.GetMock().Object,
@ -88,9 +88,9 @@ public class NetworkTest : NetworkTestsBase
        }

        var validTimeoutFrom = DateTime.UtcNow.AddSeconds(20);
-        
+
        var result = await GetClient().GetNetworkSettingsAsync(param);
-        
+
        var validTimeoutTo = DateTime.UtcNow.AddSeconds(20);

        Assert.NotNull(result);
@ -105,7 +105,7 @@ public class NetworkTest : NetworkTestsBase
        Assert.Equal(Mocker.Parameters["MaxECParityCount"], [(byte)result.MaxECParityCount]);
        Assert.Equal(Mocker.Parameters["MaxObjectSize"], [(byte)result.MaxObjectSize]);
        Assert.Equal(Mocker.Parameters["WithdrawFee"], [(byte)result.WithdrawFee]);
-       
+
        Assert.True(result.HomomorphicHashingDisabled);
        Assert.True(result.MaintenanceModeAllowed);

@ -142,13 +142,13 @@ public class NetworkTest : NetworkTestsBase

        nodeInfo1.Addresses.Add("address1");
        nodeInfo1.Addresses.Add("address2");
-        nodeInfo1.Attributes.Add(new NodeInfo.Types.Attribute { Key = "key1", Value = "value1"});
+        nodeInfo1.Attributes.Add(new NodeInfo.Types.Attribute { Key = "key1", Value = "value1" });
        nodeInfo1.Attributes.Add(new NodeInfo.Types.Attribute { Key = "key2", Value = "value2" });

        var nodeInfo2 = new NodeInfo
        {
            State = NodeInfo.Types.State.Offline,
-            PublicKey = ByteString.CopyFrom([3,4,5])
+            PublicKey = ByteString.CopyFrom([3, 4, 5])
        };

        nodeInfo2.Addresses.Add("address3");
@ -190,7 +190,7 @@ public class NetworkTest : NetworkTestsBase
        Assert.Equal(2, node1.Addresses.Count);
        Assert.Equal("address1", node1.Addresses.ElementAt(0));
        Assert.Equal("address2", node1.Addresses.ElementAt(1));
-        
+
        Assert.Equal(2, node1.Attributes.Count);

        Assert.Equal("key1", node1.Attributes.ElementAt(0).Key);
@ -202,7 +202,7 @@ public class NetworkTest : NetworkTestsBase
        Assert.Equal(NodeState.Offline, node2.State);
        Assert.Single(node2.Addresses);
        Assert.Equal("address3", node2.Addresses.ElementAt(0));
-        
+
        Assert.Single(node2.Attributes);

        Assert.Equal("key3", node2.Attributes.ElementAt(0).Key);
@ -241,10 +241,10 @@ public class NetworkTest : NetworkTestsBase
            },
            Version = new Refs.Version { Major = 2, Minor = 12 }
        };
-                
+
        body.NodeInfo.Addresses.Add("address1");
        body.NodeInfo.Addresses.Add("address2");
-        body.NodeInfo.Attributes.Add(new NodeInfo.Types.Attribute { Key = "key1", Value = "value1"});
+        body.NodeInfo.Attributes.Add(new NodeInfo.Types.Attribute { Key = "key1", Value = "value1" });
        body.NodeInfo.Attributes.Add(new NodeInfo.Types.Attribute { Key = "key2", Value = "value2" });

        Mocker.NodeInfoResponse = new LocalNodeInfoResponse { Body = body };
@ -273,11 +273,11 @@ public class NetworkTest : NetworkTestsBase
        Assert.NotNull(result);

        Assert.Equal(NodeState.Online, result.State);
-        
+
        Assert.Equal(2, result.Addresses.Count);
        Assert.Equal("address1", result.Addresses.ElementAt(0));
        Assert.Equal("address2", result.Addresses.ElementAt(1));
-        
+
        Assert.Equal(2, result.Attributes.Count);
        Assert.Equal("value1", result.Attributes["key1"]);
        Assert.Equal("value2", result.Attributes["key2"]);
--- a/src/FrostFS.SDK.Tests/ObjectTest.cs
+++ b/src/FrostFS.SDK.Tests/ObjectTest.cs
@ -1,3 +1,6 @@
+using System.Security.Cryptography;
+using System.Text;
+
 using FrostFS.Refs;
 using FrostFS.SDK.ClientV2;
 using FrostFS.SDK.ClientV2.Interfaces;
@ -9,9 +12,6 @@ using Google.Protobuf;

 using Microsoft.Extensions.Options;

-using System.Security.Cryptography;
-using System.Text;
-
 namespace FrostFS.SDK.Tests;

 public abstract class ObjectTestsBase
@ -29,7 +29,7 @@ public abstract class ObjectTestsBase
    protected ObjectTestsBase()
    {
        var ecdsaKey = key.LoadWif();
-        
+
        Settings = Options.Create(new SingleOwnerClientSettings
        {
            Key = key,
@ -46,17 +46,17 @@ public abstract class ObjectTestsBase
        ContainerId = new FrostFsContainerId(Base58.Encode(Mocker.ContainerGuid.ToBytes()));

        Mocker.ObjectHeader = new(
-            ContainerId, 
-            FrostFsObjectType.Regular, 
-            [new FrostFsAttribute("k", "v")],
+            ContainerId,
+            FrostFsObjectType.Regular,
+            [new FrostFsAttributePair("k", "v")],
            null,
            FrostFsOwner.FromKey(ecdsaKey),
            new FrostFsVersion(2, 13));
    }

    protected IFrostFSClient GetClient()
-    {   
-        return Client.GetTestInstance(
+    {
+        return FrostFSClient.GetTestInstance(
            Settings,
            null,
            NetworkMocker.GetMock().Object,
@ -75,30 +75,32 @@ public class ObjectTest : ObjectTestsBase

        var ecdsaKey = key.LoadWif();

-        var ctx = new Context {
-                Key = ecdsaKey, 
-                OwnerId = FrostFsOwner.FromKey(ecdsaKey), 
-                Version = new FrostFsVersion(2, 13) };
+        var ctx = new Context
+        {
+            Key = ecdsaKey,
+            OwnerId = FrostFsOwner.FromKey(ecdsaKey),
+            Version = new FrostFsVersion(2, 13)
+        };

        var objectId = client.CalculateObjectId(Mocker.ObjectHeader!, ctx);
-               
+
        var result = await client.GetObjectAsync(new PrmObjectGet(ContainerId, objectId) { Context = ctx });

        Assert.NotNull(result);

-        Assert.Equal(Mocker.ObjectHeader!.ContainerId.Value, result.Header.ContainerId.Value);
+        Assert.Equal(Mocker.ObjectHeader!.ContainerId.GetValue(), result.Header.ContainerId.GetValue());
        Assert.Equal(Mocker.ObjectHeader!.OwnerId!.Value, result.Header.OwnerId!.Value);
        Assert.Equal(Mocker.ObjectHeader.PayloadLength, result.Header.PayloadLength);
        Assert.Single(result.Header.Attributes);
        Assert.Equal(Mocker.ObjectHeader.Attributes[0].Key, result.Header.Attributes[0].Key);
-        Assert.Equal(Mocker.ObjectHeader.Attributes[0].Value,result.Header.Attributes[0].Value);
+        Assert.Equal(Mocker.ObjectHeader.Attributes[0].Value, result.Header.Attributes[0].Value);
    }

    [Fact]
    public async void PutObjectTest()
    {
        Mocker.ResultObjectIds = new([SHA256.HashData([])]);
-       
+
        Random rnd = new();
        var bytes = new byte[1024];
        rnd.NextBytes(bytes);
@ -119,20 +121,20 @@ public class ObjectTest : ObjectTestsBase

        Assert.NotNull(result);
        Assert.Equal(Mocker.ResultObjectIds.First(), result.ToHash());
-       
+
        Assert.True(Mocker.ClientStreamWriter.CompletedTask);

        Assert.Equal(0, body1!.Chunk.Length);
        Assert.Equal(Object.PutRequest.Types.Body.ObjectPartOneofCase.Init, body1!.ObjectPartCase);

        Assert.Equal(1024, body2!.Chunk.Length);
-        Assert.Equal(Object.PutRequest.Types.Body.ObjectPartOneofCase.Chunk, body2!.ObjectPartCase);       
+        Assert.Equal(Object.PutRequest.Types.Body.ObjectPartOneofCase.Chunk, body2!.ObjectPartCase);
    }

    [Fact]
    public async void ClientCutTest()
    {
-        NetworkMocker.Parameters = new Dictionary<string, byte[]>() { { "MaxObjectSize", [0x0, 0xa] } }; 
+        NetworkMocker.Parameters = new Dictionary<string, byte[]>() { { "MaxObjectSize", [0x0, 0xa] } };

        var blockSize = 2560;
        byte[] bytes = File.ReadAllBytes(@".\..\..\..\TestData\cat.jpg");
@ -251,11 +253,11 @@ public class ObjectTest : ObjectTestsBase
        Assert.Equal(Mocker.ObjectId.ToMessage(), request.Body.Address.ObjectId);

        Assert.NotNull(response);
-        Assert.Equal(ContainerId.Value, response.ContainerId.Value);
+        Assert.Equal(ContainerId.GetValue(), response.ContainerId.GetValue());

        Assert.Equal(Mocker.ObjectHeader!.OwnerId!.Value, response.OwnerId!.Value);
        Assert.Equal(Mocker.ObjectHeader!.Version!.ToString(), response.Version!.ToString());
-     
+
        Assert.Equal(Mocker.HeadResponse!.PayloadLength, response.PayloadLength);

        Assert.Equal(FrostFsObjectType.Regular, response.ObjectType);
--- a/src/FrostFS.SDK.Tests/SessionTests.cs
+++ b/src/FrostFS.SDK.Tests/SessionTests.cs
@ -1,3 +1,5 @@
+using System.Security.Cryptography;
+
 using FrostFS.SDK.ClientV2;
 using FrostFS.SDK.ClientV2.Interfaces;
 using FrostFS.SDK.ClientV2.Mappers.GRPC;
@ -6,8 +8,6 @@ using FrostFS.SDK.Cryptography;

 using Microsoft.Extensions.Options;

-using System.Security.Cryptography;
-
 namespace FrostFS.SDK.Tests;

 public abstract class SessionTestsBase
@ -16,7 +16,7 @@ public abstract class SessionTestsBase

    protected IOptions<SingleOwnerClientSettings> Settings { get; set; }

- 
+
    protected ECDsa ECDsaKey { get; set; }
    protected FrostFsOwner OwnerId { get; set; }
    protected SessionMocker Mocker { get; set; }
@ -41,7 +41,7 @@ public abstract class SessionTestsBase

    protected IFrostFSClient GetClient()
    {
-        return ClientV2.Client.GetTestInstance(
+        return ClientV2.FrostFSClient.GetTestInstance(
            Settings,
            null,
            new NetworkMocker(this.key).GetMock().Object,
@ -100,8 +100,8 @@ public class SessionTest : SessionTestsBase
        Assert.Equal(exp, Mocker.CreateSessionRequest.Body.Expiration);
        Assert.NotNull(Mocker.CreateSessionRequest.MetaHeader);
        Assert.Equal(Mocker.Version.ToMessage(), Mocker.CreateSessionRequest.MetaHeader.Version);
-       
-   
+
+
        Assert.Null(Mocker.Metadata);

        if (useContext)
--- a/Show more
+++ b/Show more