src/FrostFS.SDK.ClientV2/Cache.cs

@@ -0,0 +1,25 @@
+
+
+using Microsoft.Extensions.Caching.Memory;
+
+namespace FrostFS.SDK.ClientV2
+{
+    internal static class Cache
+    {
+        private static readonly IMemoryCache _ownersCache = new MemoryCache(new MemoryCacheOptions
+        {
+            // TODO: get from options?
+            SizeLimit = 256
+        });
+
+        private static readonly IMemoryCache _containersCache = new MemoryCache(new MemoryCacheOptions
+        {
+            // TODO: get from options?
+            SizeLimit = 1024
+        });
+
+        internal static IMemoryCache Owners => _ownersCache;
+
+        internal static IMemoryCache Containers => _containersCache;
+    }
+}

src/FrostFS.SDK.ClientV2/Client.cs

@@ -125,7 +125,7 @@ public class Client : IFrostFSClient
 
     public IAsyncEnumerable<ContainerId> ListContainersAsync(PrmContainerGetAll? args = null)
     {
-        args = args ?? new PrmContainerGetAll();
+        args ??= new PrmContainerGetAll();
         var service = GetContainerService(args);      
         return service.ListContainersAsync(args);
     }
@@ -223,7 +223,10 @@ public class Client : IFrostFSClient
     #region ToolsImplementation
     public ObjectId CalculateObjectId(ObjectHeader header)
     {
-        return new ObjectTools(ClientCtx).CalculateObjectId(header);
+        if (header == null)
+            throw new ArgumentNullException(nameof(header));
+
+        return ObjectTools.CalculateObjectId(header, ClientCtx);
     }
     #endregion
 
@@ -236,7 +239,6 @@ public class Client : IFrostFSClient
         if (!localNodeInfo.Version.IsSupported(ClientCtx.Version))
         {
             var msg = $"FrostFS {localNodeInfo.Version} is not supported.";
-            Console.WriteLine(msg);
             throw new ApplicationException(msg);
         }
     }

src/FrostFS.SDK.ClientV2/CllientKey.cs

@@ -0,0 +1,13 @@
+using FrostFS.SDK.Cryptography;
+using Google.Protobuf;
+using System.Security.Cryptography;
+
+namespace FrostFS.SDK.ClientV2
+{
+    public class ClientKey(ECDsa key)
+    {
+        internal ECDsa ECDsaKey { get; } = key;
+
+        internal ByteString PublicKeyProto { get; } = ByteString.CopyFrom(key.PublicKey());
+    }
+}

src/FrostFS.SDK.ClientV2/Exceptions/ResponseException.cs

@@ -1,12 +1,9 @@
-using System;
 using FrostFS.SDK.ModelsV2;
+using System;
 
-public class ResponseException : Exception
+namespace FrostFS.SDK.ClientV2;
+
+public class ResponseException(ResponseStatus status) : Exception()
 {
-    public Status Status { get; set; }
+    public ResponseStatus Status { get; set; } = status;
-
-    public ResponseException(Status status) : base()
-    {
-        Status = status;
-    }   
 }

src/FrostFS.SDK.ClientV2/FrostFS.SDK.ClientV2.csproj

@@ -12,8 +12,11 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
+    <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" />
     <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="8.0.1" />
+    <PackageReference Include="System.Runtime.Caching" Version="8.0.0" />
   </ItemGroup>
 
   <ItemGroup>

src/FrostFS.SDK.ClientV2/Mappers/Container.cs

@@ -10,12 +10,12 @@ namespace FrostFS.SDK.ClientV2.Mappers.GRPC;
 
 public static class ContainerMapper
 {
-    public static Container.Container ToGrpcMessage(this ModelsV2.Container container)
+    public static Container.Container ToMessage(this ModelsV2.Container container)
     {
         return new Container.Container
         {
             BasicAcl = (uint)container.BasicAcl,
-            PlacementPolicy = container.PlacementPolicy.ToGrpcMessage(),
+            PlacementPolicy = container.PlacementPolicy.ToMessage(),
             Nonce = ByteString.CopyFrom(container.Nonce.ToBytes())
         };
     }

src/FrostFS.SDK.ClientV2/Mappers/ContainerId.cs

@@ -2,16 +2,29 @@ using FrostFS.Refs;
 using FrostFS.SDK.Cryptography;
 using FrostFS.SDK.ModelsV2;
 using Google.Protobuf;
+using Microsoft.Extensions.Caching.Memory;
+using System;
 
 namespace FrostFS.SDK.ClientV2.Mappers.GRPC;
 
 public static class ContainerIdMapper
 {
-    public static ContainerID ToGrpcMessage(this ContainerId containerId)
+    private static readonly MemoryCacheEntryOptions _oneHourExpiration = new MemoryCacheEntryOptions()
+       .SetSlidingExpiration(TimeSpan.FromHours(1))
+       .SetSize(1);
+
+    public static ContainerID ToMessage(this ContainerId model)
     {
-        return new ContainerID
+        if (!Cache.Owners.TryGetValue(model, out ContainerID? message))
         {
-            Value = ByteString.CopyFrom(Base58.Decode(containerId.Value))
+            message = new ContainerID
-        };
+            {
+                Value = ByteString.CopyFrom(Base58.Decode(model.Value))
+            };
+
+            Cache.Owners.Set(model, message, _oneHourExpiration);
+        }
+
+        return message!;        
     }
 }

src/FrostFS.SDK.ClientV2/Mappers/MetaHeader.cs

@@ -1,21 +1,15 @@
 using FrostFS.SDK.ModelsV2;
 using FrostFS.Session;
-using Version = FrostFS.Refs.Version;
 
 namespace FrostFS.SDK.ClientV2.Mappers.GRPC;
 
 public static class MetaHeaderMapper
 {
-    public static RequestMetaHeader ToGrpcMessage(this MetaHeader metaHeader)
+    public static RequestMetaHeader ToMessage(this MetaHeader metaHeader)
     {
         return new RequestMetaHeader
         {
-            Version = new Version
+            Version = metaHeader.Version.ToMessage(),
-            {
-                Major = (uint)metaHeader.Version.Major,
-                Minor = (uint)metaHeader.Version.Minor,
-
-            },
             Epoch = (uint)metaHeader.Epoch,
             Ttl = (uint)metaHeader.Ttl
         };

src/FrostFS.SDK.ClientV2/Mappers/Netmap/Netmap.cs

@@ -10,6 +10,8 @@ public static class NetmapMapper
     {
         return new NetmapSnapshot(
             netmap.Body.Netmap.Epoch,
-            netmap.Body.Netmap.Nodes.Select(n => n.ToModel(netmap.MetaHeader.Version)).ToArray());
+            netmap.Body.Netmap.Nodes
+                .Select(n => n.ToModel(netmap.MetaHeader.Version))
+                .ToArray());
     }
 }

src/FrostFS.SDK.ClientV2/Mappers/Netmap/PlacementPolicy.cs

@@ -5,7 +5,7 @@ namespace FrostFS.SDK.ClientV2.Mappers.GRPC.Netmap;
 
 public static class PlacementPolicyMapper
 {
-    public static PlacementPolicy ToGrpcMessage(this ModelsV2.Netmap.PlacementPolicy placementPolicy)
+    public static PlacementPolicy ToMessage(this ModelsV2.Netmap.PlacementPolicy placementPolicy)
     {
         var pp = new PlacementPolicy
         {
@@ -14,9 +14,10 @@ public static class PlacementPolicyMapper
             Replicas = { },
             Unique = placementPolicy.Unique
         };
+
         foreach (var replica in placementPolicy.Replicas)
         {
-            pp.Replicas.Add(replica.ToGrpcMessage());
+            pp.Replicas.Add(replica.ToMessage());
         }
 
         return pp;

src/FrostFS.SDK.ClientV2/Mappers/Netmap/Replica.cs

@@ -4,7 +4,7 @@ namespace FrostFS.SDK.ClientV2.Mappers.GRPC.Netmap;
 
 public static class ReplicaMapper
 {
-    public static Replica ToGrpcMessage(this ModelsV2.Netmap.Replica replica)
+    public static Replica ToMessage(this ModelsV2.Netmap.Replica replica)
     {
         return new Replica
         {

src/FrostFS.SDK.ClientV2/Mappers/Object/ObjectAttributeMapper.cs

@@ -5,7 +5,7 @@ namespace FrostFS.SDK.ClientV2.Mappers.GRPC;
 
 public static class ObjectAttributeMapper
 {
-    public static Header.Types.Attribute ToGrpcMessage(this ObjectAttribute attribute)
+    public static Header.Types.Attribute ToMessage(this ObjectAttribute attribute)
     {
         return new Header.Types.Attribute
         {

src/FrostFS.SDK.ClientV2/Mappers/Object/ObjectFilterMapper.cs

@@ -7,7 +7,7 @@ namespace FrostFS.SDK.ClientV2.Mappers.GRPC;
 
 public static class ObjectFilterMapper
 {
-    public static SearchRequest.Types.Body.Types.Filter ToGrpcMessage(this IObjectFilter filter)
+    public static SearchRequest.Types.Body.Types.Filter ToMessage(this IObjectFilter filter)
     {
         var objMatchTypeName = filter.MatchType switch
         {

src/FrostFS.SDK.ClientV2/Mappers/Object/ObjectHeaderMapper.cs

@@ -10,7 +10,7 @@ namespace FrostFS.SDK.ClientV2.Mappers.GRPC;
 
 public static class ObjectHeaderMapper
 {
-    public static Header ToGrpcMessage(this ObjectHeader header)
+    public static Header ToMessage(this ObjectHeader header)
     {
         var objTypeName = header.ObjectType switch
         {
@@ -22,14 +22,16 @@ public static class ObjectHeaderMapper
 
         var head = new Header
         {         
-            ContainerId = header.ContainerId.ToGrpcMessage(),
+            OwnerId = header!.OwnerId != null ? header.OwnerId.ToMessage() : null,
+            Version = header!.Version != null ? header.Version.ToMessage() : null,
+            ContainerId = header.ContainerId.ToMessage(),
             ObjectType = objTypeName,
             PayloadLength = header.PayloadLength
         };
 
         foreach (var attribute in header.Attributes)
         {
-            head.Attributes.Add(attribute.ToGrpcMessage());
+            head.Attributes.Add(attribute.ToMessage());
         }
 
         var split = header.Split;
@@ -37,15 +39,8 @@ public static class ObjectHeaderMapper
         {
             head.Split = new Header.Types.Split
             {
-                Parent = split.Parent?.ToGrpcMessage(),
-                ParentSignature = split.ParentSignature?.ToGrpcMessage(),
-                ParentHeader = split.ParentHeader?.ToGrpcMessage(),
-                Previous = split.Previous?.ToGrpcMessage(),
                 SplitId = split.SplitId != null ? ByteString.CopyFrom(split.SplitId.ToBinary()) : null
             };
-
-            if (split.Children != null && split.Children.Count != 0)
-                head.Split.Children.AddRange(split.Children.Select(id => id.ToGrpcMessage()));
         }
 
         return head;

src/FrostFS.SDK.ClientV2/Mappers/Object/ObjectId.cs

@@ -6,7 +6,7 @@ namespace FrostFS.SDK.ClientV2.Mappers.GRPC;
 
 public static class ObjectIdMapper
 {
-    public static ObjectID ToGrpcMessage(this ObjectId objectId)
+    public static ObjectID ToMessage(this ObjectId objectId)
     {
         return new ObjectID
         {

src/FrostFS.SDK.ClientV2/Mappers/OwnerId.cs

@@ -1,21 +1,42 @@
 using FrostFS.Refs;
+using FrostFS.SDK.Cryptography;
 using FrostFS.SDK.ModelsV2;
 using Google.Protobuf;
+using Microsoft.Extensions.Caching.Memory;
+using System;
 
 namespace FrostFS.SDK.ClientV2.Mappers.GRPC;
 
 public static class OwnerIdMapper
 {
-    public static OwnerID ToGrpcMessage(this OwnerId ownerId)
+    private static readonly MemoryCacheEntryOptions _oneHourExpiration = new MemoryCacheEntryOptions()
+        .SetSlidingExpiration(TimeSpan.FromHours(1))
+        .SetSize(1);
+
+    public static OwnerID ToMessage(this OwnerId model)
     {
-        return new OwnerID
+        if (!Cache.Owners.TryGetValue(model, out OwnerID? message))
         {
-            Value = ByteString.CopyFrom(ownerId.ToHash())
+            message = new OwnerID
-        };
+            {
+                Value = ByteString.CopyFrom(model.ToHash())
+            };
+
+            Cache.Owners.Set(model, message, _oneHourExpiration);
+        }
+
+        return message!;
     }
 
-    public static OwnerId ToModel(this OwnerID ownerId)
+    public static OwnerId ToModel(this OwnerID message)
     {
-        return new OwnerId(ownerId.ToString());
+        if (!Cache.Owners.TryGetValue(message, out OwnerId? model))
+        {
+            model = new OwnerId(Base58.Encode(message.Value.ToByteArray()));
+         
+            Cache.Owners.Set(message, model, _oneHourExpiration);
+        }
+
+        return model!;
     }
 }

src/FrostFS.SDK.ClientV2/Mappers/SignatureMapper.cs

@@ -6,14 +6,15 @@ namespace FrostFS.SDK.ClientV2.Mappers.GRPC;
 
 public static class SignatureMapper
 {
-    public static Refs.Signature ToGrpcMessage(this Signature signature)
+    public static Refs.Signature ToMessage(this Signature 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(message: $"Unexpected enum value: {signature.Scheme}",
+                                             paramName: nameof(signature.Scheme))
         };
 
         return new Refs.Signature

src/FrostFS.SDK.ClientV2/Mappers/Status.cs

@@ -5,13 +5,15 @@ namespace FrostFS.SDK.ClientV2.Mappers.GRPC;
 
 public static class StatusMapper
 {
-    public static ModelsV2.Status ToModel(this Status.Status status)
+    public static ModelsV2.ResponseStatus ToModel(this Status.Status status)
     {
-        if (status is null) return new ModelsV2.Status(StatusCode.Success);
+        if (status is null) 
+            return new ModelsV2.ResponseStatus(StatusCode.Success);
+
         var codeName = Enum.GetName(typeof(StatusCode), status.Code);
         
         return codeName is null
             ? throw new ArgumentException($"Unknown StatusCode. Value: '{status.Code}'.")
-            : new ModelsV2.Status((StatusCode)Enum.Parse(typeof(StatusCode), codeName), status.Message);
+            : new ModelsV2.ResponseStatus((StatusCode)Enum.Parse(typeof(StatusCode), codeName), status.Message);
     }
 }

src/FrostFS.SDK.ClientV2/Mappers/Version.cs

@@ -1,20 +1,74 @@
+using System.Collections;
+using System.Threading;
 using Version = FrostFS.Refs.Version;
 
 namespace FrostFS.SDK.ClientV2.Mappers.GRPC;
 
 public static class VersionMapper
 {
-    public static Version ToGrpcMessage(this ModelsV2.Version version)
+    private static readonly Hashtable _cacheMessages = [];
+    private static readonly Hashtable _cacheModels = [];
+    private static SpinLock _spinlock = new();
+
+    public static Version ToMessage(this ModelsV2.Version model)
     {
-        return new Version
+        var key = model.Major << 16 + model.Minor;
+
+        if (!_cacheMessages.ContainsKey(key))
         {
-            Major = (uint)version.Major,
+            bool lockTaken = false;
-            Minor = (uint)version.Minor
+            try
-        };
+            {
+                _spinlock.Enter(ref lockTaken);
+                var message = new Version
+                {
+                    Major = (uint)model.Major,
+                    Minor = (uint)model.Minor
+                };
+
+                _cacheMessages.Add(key, message);
+                return message;
+            }
+            catch (System.ArgumentException)
+            {
+                // ignore attempt to add duplicate error.
+            }
+            finally
+            {
+                if (lockTaken)
+                    _spinlock.Exit(false);
+            }
+        }
+
+        return (Version)_cacheMessages[key];
     }
 
-    public static ModelsV2.Version ToModel(this Version version)
+    public static ModelsV2.Version ToModel(this Version message)
     {
-        return new ModelsV2.Version((int)version.Major, (int)version.Minor);
+        var key = (int)message.Major << 16 + (int)message.Minor;
+
+        if (!_cacheModels.ContainsKey(key))
+        {
+            bool lockTaken = false;
+            try
+            {
+                _spinlock.Enter(ref lockTaken);
+                var model = new ModelsV2.Version((int)message.Major, (int)message.Minor);
+
+                _cacheModels.Add(key, model);
+                return model;
+            }
+            catch (System.ArgumentException)
+            {
+                // ignore attempt to add duplicate error.
+            }
+            finally
+            {
+                if (lockTaken)
+                    _spinlock.Exit(false);
+            }
+        }
+
+        return (ModelsV2.Version)_cacheModels[key];
     }
 }

src/FrostFS.SDK.ClientV2/Parameters/PrmObjectPut.cs

@@ -41,4 +41,10 @@ public sealed class PrmObjectPut : IContext, ISessionToken
 
     /// <inheritdoc />
     public SessionToken? SessionToken { get; set; }
+
+    internal int MaxObjectSizeCache { get; set; }
+
+    internal ulong CurrentStreamPosition { get; set; } = 0;
+
+    internal ulong FullLength { get; set; } = 0;
 }

src/FrostFS.SDK.ClientV2/Services/ContainerServiceProvider.cs

@@ -17,7 +17,7 @@ internal class ContainerServiceProvider(ContainerService.ContainerServiceClient
 {
     internal async Task<ModelsV2.Container> GetContainerAsync(PrmContainerGet args)
     {
-        GetRequest request = GetContainerRequest(args.ContainerId.ToGrpcMessage(), args.XHeaders);
+        GetRequest request = GetContainerRequest(args.ContainerId.ToMessage(), args.XHeaders);
 
         var response = await service.GetAsync(request, null, args.Context!.Deadline, args.Context.CancellationToken);
 
@@ -34,12 +34,12 @@ internal class ContainerServiceProvider(ContainerService.ContainerServiceClient
         {
             Body = new ListRequest.Types.Body
             {
-                OwnerId = Context.Owner.ToGrpcMessage()
+                OwnerId = Context.Owner.ToMessage()
             }
         };
         
         request.AddMetaHeader(args.XHeaders);
-        request.Sign(Context.Key);
+        request.Sign(Context.Key.ECDsaKey);
 
         var response = await service.ListAsync(request, null, ctx.Deadline, ctx.CancellationToken);
        
@@ -54,21 +54,21 @@ internal class ContainerServiceProvider(ContainerService.ContainerServiceClient
     internal async Task<ContainerId> CreateContainerAsync(PrmContainerCreate args)
     {
         var ctx = args.Context!;
-        var grpcContainer = args.Container.ToGrpcMessage(); 
+        var grpcContainer = args.Container.ToMessage(); 
-        grpcContainer.OwnerId = Context.Owner.ToGrpcMessage();
+        grpcContainer.OwnerId = Context.Owner.ToMessage();
-        grpcContainer.Version = Context.Version.ToGrpcMessage();
+        grpcContainer.Version = Context.Version.ToMessage();
         
         var request = new PutRequest
         {
             Body = new PutRequest.Types.Body
             {
                 Container = grpcContainer,
-                Signature = Context.Key.SignRFC6979(grpcContainer)               
+                Signature = Context.Key.ECDsaKey.SignRFC6979(grpcContainer)               
             }
         };
 
         request.AddMetaHeader(args.XHeaders);
-        request.Sign(Context.Key);
+        request.Sign(Context.Key.ECDsaKey);
 
         var response = await service.PutAsync(request, null, ctx.Deadline, ctx.CancellationToken);
       
@@ -86,14 +86,14 @@ internal class ContainerServiceProvider(ContainerService.ContainerServiceClient
         {
             Body = new DeleteRequest.Types.Body
             {
-                ContainerId = args.ContainerId.ToGrpcMessage(),
+                ContainerId = args.ContainerId.ToMessage(),
-                Signature = Context.Key.SignRFC6979(args.ContainerId.ToGrpcMessage().Value)
+                Signature = Context.Key.ECDsaKey.SignRFC6979(args.ContainerId.ToMessage().Value)
             }
         };
 
         request.AddMetaHeader(args.XHeaders);
 
-        request.Sign(Context.Key);
+	    request.Sign(Context.Key.ECDsaKey);
 
         var response = await service.DeleteAsync(request, null, ctx.Deadline, ctx.CancellationToken);
 
@@ -113,7 +113,7 @@ internal class ContainerServiceProvider(ContainerService.ContainerServiceClient
         };
 
         request.AddMetaHeader(xHeaders);
-        request.Sign(Context.Key);
+        request.Sign(Context.Key.ECDsaKey);
 
         return request;
     }

src/FrostFS.SDK.ClientV2/Services/NetmapServiceProvider.cs

@@ -49,7 +49,7 @@ internal class NetmapServiceProvider : ContextAccessor
         };
 
         request.AddMetaHeader(args.XHeaders);
-        request.Sign(Context.Key);
+        request.Sign(Context.Key.ECDsaKey);
         
         var response = await netmapServiceClient.LocalNodeInfoAsync(request, null, ctx.Deadline, ctx.CancellationToken);
 
@@ -63,7 +63,7 @@ internal class NetmapServiceProvider : ContextAccessor
         var request = new NetworkInfoRequest(); 
 
         request.AddMetaHeader(null);
-        request.Sign(Context.Key);
+        request.Sign(Context.Key.ECDsaKey);
  
         var response = await netmapServiceClient.NetworkInfoAsync(request, null, ctx.Deadline, ctx.CancellationToken);
 
@@ -79,7 +79,7 @@ internal class NetmapServiceProvider : ContextAccessor
         var request = new NetmapSnapshotRequest();
 
         request.AddMetaHeader(args.XHeaders);
-        request.Sign(Context.Key);
+        request.Sign(Context.Key.ECDsaKey);
  
         var response = await netmapServiceClient.NetmapSnapshotAsync(request, null, ctx.Deadline, ctx.CancellationToken);
 

src/FrostFS.SDK.ClientV2/Services/ObjectServiceProvider.cs

@@ -13,13 +13,13 @@ using FrostFS.Session;
 using FrostFS.SDK.ModelsV2;
 using FrostFS.SDK.ClientV2.Extensions;
 using FrostFS.SDK.ClientV2.Parameters;
+using System.Buffers;
 
 namespace FrostFS.SDK.ClientV2;
 
-internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, ClientEnvironment ctx) : ContextAccessor(ctx), ISessionProvider
+internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, ClientEnvironment env) : ContextAccessor(env), ISessionProvider
 {
-    readonly ObjectTools tools = new(ctx);
+    readonly SessionProvider sessions = new (env);
-    readonly SessionProvider sessions = new (ctx);
 
     public async ValueTask<Session.SessionToken> GetOrCreateSession(ISessionToken args, Context ctx)
     {
@@ -35,8 +35,8 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
             {
                 Address = new Address
                 {
-                    ContainerId = args.ContainerId.ToGrpcMessage(),
+                    ContainerId = args.ContainerId.ToMessage(),
-                    ObjectId = args.ObjectId.ToGrpcMessage()
+                    ObjectId = args.ObjectId.ToMessage()
                 }
             }
         };
@@ -46,11 +46,11 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
         sessionToken.CreateObjectTokenContext(
             request.Body.Address,
             ObjectSessionContext.Types.Verb.Head,
-            Context.Key);
+            Context.Key.ECDsaKey);
 
         request.AddMetaHeader(args.XHeaders, sessionToken);
 
-        request.Sign(Context.Key);
+        request.Sign(Context.Key.ECDsaKey);
 
         var response = await client!.HeadAsync(request, null, ctx.Deadline, ctx.CancellationToken);
         
@@ -69,8 +69,8 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
             {
                 Address = new Address
                 {
-                    ContainerId = args.ContainerId.ToGrpcMessage(),
+                    ContainerId = args.ContainerId.ToMessage(),
-                    ObjectId = args.ObjectId.ToGrpcMessage()
+                    ObjectId = args.ObjectId.ToMessage()
                 }
             }
         };
@@ -80,11 +80,11 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
         sessionToken.CreateObjectTokenContext(
             request.Body.Address,
             ObjectSessionContext.Types.Verb.Get,
-            Context.Key);
+            Context.Key.ECDsaKey);
 
         request.AddMetaHeader(args.XHeaders, sessionToken);
 
-        request.Sign(Context.Key);
+        request.Sign(Context.Key.ECDsaKey);
 
         return await GetObject(request, ctx);
     }
@@ -98,8 +98,8 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
             {
                 Address = new Address
                 {
-                    ContainerId = args.ContainerId.ToGrpcMessage(),
+                    ContainerId = args.ContainerId.ToMessage(),
-                    ObjectId = args.ObjectId.ToGrpcMessage()
+                    ObjectId = args.ObjectId.ToMessage()
                 }
             }
         };
@@ -109,10 +109,10 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
         sessionToken.CreateObjectTokenContext(
             request.Body.Address,
             ObjectSessionContext.Types.Verb.Delete,
-            Context.Key);
+            Context.Key.ECDsaKey);
 
         request.AddMetaHeader(args.XHeaders, sessionToken);
-        request.Sign(Context.Key);
+        request.Sign(Context.Key.ECDsaKey);
 
         var response = await client.DeleteAsync(request, null, ctx.Deadline, ctx.CancellationToken);
         
@@ -126,24 +126,24 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
         {
             Body = new SearchRequest.Types.Body
             {
-                ContainerId = args.ContainerId.ToGrpcMessage(),
+                ContainerId = args.ContainerId.ToMessage(),
                 Filters = { },
                 Version = 1  // TODO: clarify this param
             }
         };
 
-        request.Body.Filters.AddRange(args.Filters.Select(f => f.ToGrpcMessage()));
+        request.Body.Filters.AddRange(args.Filters.Select(f => f.ToMessage()));
         
         var sessionToken = await GetOrCreateSession(args, ctx);
 
         sessionToken.CreateObjectTokenContext(
             new Address { ContainerId = request.Body.ContainerId },
             ObjectSessionContext.Types.Verb.Search,
-            Context.Key);
+            Context.Key.ECDsaKey);
 
         request.AddMetaHeader(args.XHeaders, sessionToken);
                 
-        request.Sign(Context.Key);
+        request.Sign(Context.Key.ECDsaKey);
 
         var objectsIds = SearchObjects(request, ctx);
 
@@ -153,7 +153,7 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
         }
     }
 
-    internal Task<ObjectId> PutObjectAsync(PrmObjectPut args)
+    internal async Task<ObjectId> PutObjectAsync(PrmObjectPut args)
     {
         if (args.Header == null)
             throw new ArgumentException("Value cannot be null", nameof(args.Header));
@@ -162,15 +162,22 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
             throw new ArgumentException("Value cannot be null", nameof(args.Payload));
 
         if (args.ClientCut)
-            return PutClientCutObject(args);
+            return await PutClientCutObject(args);
         else
-            return PutStreamObject(args);
+        {
+            if (args.Header.PayloadLength > 0)
+                args.FullLength = args.Header.PayloadLength;
+            else if (args.Payload.CanSeek)
+                args.FullLength = (ulong)args.Payload.Length;
+
+            return (await PutStreamObject(args)).ObjectId;
+        }
     }
    
     internal async Task<ObjectId> PutSingleObjectAsync(PrmSingleObjectPut args)
     {
         var ctx = args.Context!;
-        var grpcObject = tools.CreateObject(args.FrostFsObject);
+        var grpcObject = ObjectTools.CreateObject(args.FrostFsObject, env);
 
         var request = new PutSingleRequest
         {
@@ -185,11 +192,11 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
         sessionToken.CreateObjectTokenContext(
             new Address { ContainerId = grpcObject.Header.ContainerId, ObjectId = grpcObject.ObjectId},
             ObjectSessionContext.Types.Verb.Put,
-            Context.Key);
+            Context.Key.ECDsaKey);
 
         request.AddMetaHeader(args.XHeaders, sessionToken);
 
-        request.Sign(Context.Key);
+        request.Sign(Context.Key.ECDsaKey);
 
         var response = await client.PutSingleAsync(request, null, ctx.Deadline, ctx.CancellationToken);
 
@@ -201,156 +208,136 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
     private async Task<ObjectId> PutClientCutObject(PrmObjectPut args)
     {
         var ctx = args.Context!;
+       
         var tokenRaw = await GetOrCreateSession(args, ctx);
         var token = new ModelsV2.SessionToken(tokenRaw.Serialize());
 
+        args.SessionToken = token;
+
         var payloadStream = args.Payload!;
         var header = args.Header!;
 
-        ObjectId? objectId;
-        List<ObjectId> sentObjectIds = [];
-        
-        FrostFsObject? currentObject;
-
-        var networkSettings = await Context.Client.GetNetworkSettingsAsync(new PrmNetworkSettings(ctx));
-
-        var objectSize = (int)networkSettings.MaxObjectSize;
-
         var fullLength = header.PayloadLength;
         
-        if (payloadStream.CanSeek)
+        if (payloadStream.CanSeek && fullLength == 0)
-        {
+            fullLength = (ulong)payloadStream.Length;
-            objectSize = (int)Math.Min(objectSize, payloadStream.Length);
 
-            if (fullLength == 0)
+        args.FullLength = fullLength;
-                fullLength = (ulong)payloadStream.Length;
+
+        if (args.MaxObjectSizeCache == 0)
+        {
+            var networkSettings = await Context.Client.GetNetworkSettingsAsync(new PrmNetworkSettings(ctx));
+            args.MaxObjectSizeCache = (int)networkSettings.MaxObjectSize;
         }
 
-        if (fullLength == 0)
+        var restBytes = fullLength - args.CurrentStreamPosition;
-            throw new ArgumentException("Payload stream must be able to seek or PayloadLength must be specified");
+        var objectSize = restBytes > 0 ? (int)Math.Min((ulong)args.MaxObjectSizeCache, restBytes) : args.MaxObjectSizeCache;        
 
-        var buffer = new byte[objectSize];      
+        //define collection capacity
+        var restPart = (restBytes % (ulong)objectSize) > 0 ? 1 : 0;
+        var objectsCount = fullLength > 0 ? (int)(restBytes / (ulong)objectSize) + restPart : 0;
 
-        var largeObject = new LargeObject(header.ContainerId);
+        List<ObjectId> sentObjectIds = new(objectsCount);
 
-        var split = new Split();
+        Split? split = null;
 
-        while (true)
+        // keep attributes for the large object
+        var attributes = args.Header!.Attributes;
+
+        // send all parts except the last one as separate Objects
+        while (restBytes > (ulong)args.MaxObjectSizeCache) 
         {
-            var bytesCount = await payloadStream.ReadAsync(buffer, 0, objectSize);
+            if (split == null)
+            {
+                split = new Split();
+                args.Header!.Attributes = [];                
+            }
 
-            split.Previous = sentObjectIds.LastOrDefault();
+            split!.Previous = sentObjectIds.LastOrDefault();
+            args.Header!.Split = split;
 
-            largeObject.Header.PayloadLength += (ulong)bytesCount;
+            var result = await PutStreamObject(args);
 
-            currentObject = new FrostFsObject(header.ContainerId)
+            sentObjectIds.Add(result.ObjectId);
-                .SetPayload(bytesCount < objectSize ? buffer[..bytesCount] : buffer)
-                .SetSplit(split);
 
-            if (largeObject.PayloadLength == fullLength)
+            restBytes -= (ulong)result.ObjectSize;
-                break;
-
-            objectId = await PutSingleObjectAsync(new PrmSingleObjectPut(currentObject, ctx) { SessionToken = token });
-            
-            sentObjectIds.Add(objectId!);
         }
 
-        if (sentObjectIds.Count != 0)
+        // send the last part and create linkObject
+        if (sentObjectIds.Count > 0)
         {
-            largeObject.AddAttributes(args.Header!.Attributes);
+            var largeObjectHeader = new ObjectHeader(header.ContainerId) { PayloadLength = fullLength };
 
-            currentObject.SetParent(largeObject);
+            largeObjectHeader.Attributes.AddRange(attributes);
 
-            var putSingleObjectParams = new PrmSingleObjectPut(currentObject, ctx) { SessionToken = token };
+            args.Header.Split!.ParentHeader = largeObjectHeader;
 
-            objectId = await PutSingleObjectAsync(putSingleObjectParams);
+            var result = await PutStreamObject(args);
 
-            sentObjectIds.Add(objectId);
+            sentObjectIds.Add(result.ObjectId);
 
-            var linkObject = new LinkObject(header.ContainerId, split.SplitId, largeObject)
+            var linkObject = new LinkObject(header.ContainerId, split!.SplitId, largeObjectHeader)
                 .AddChildren(sentObjectIds);
 
-            linkObject.Header.Attributes.Clear();
+            _ = await PutSingleObjectAsync(new PrmSingleObjectPut(linkObject) { Context = args.Context});
 
-            _ = await PutSingleObjectAsync(new PrmSingleObjectPut(linkObject, ctx){ SessionToken = token });
+            return split.Parent!;
-
-            return tools.CalculateObjectId(largeObject.Header);
         }
 
-        currentObject
+        // We are here if the payload is placed to one Object. It means no cut action, just simple PUT.
-            .SetSplit(null)
+        var singlePartResult = await PutStreamObject(args);
-            .AddAttributes(args.Header!.Attributes);
 
-        return await PutSingleObjectAsync(new PrmSingleObjectPut(currentObject, ctx));
+        return singlePartResult.ObjectId;
     }
 
-    private async Task<ObjectId> PutStreamObject(PrmObjectPut args)
+    struct PutObjectResult(ObjectId objectId, int objectSize)
+    {
+        public ObjectId ObjectId = objectId;
+        public int ObjectSize = objectSize;
+    }
+
+    private async Task<PutObjectResult> PutStreamObject(PrmObjectPut args)
     {
         var ctx = args.Context!;
         var payload = args.Payload!;
-        var header = args.Header!;
 
-        var hdr = header.ToGrpcMessage();
+        var chunkSize = args.BufferMaxSize > 0 ? args.BufferMaxSize : Constants.ObjectChunkSize;
-        hdr.OwnerId = Context.Owner.ToGrpcMessage();
-        hdr.Version = Context.Version.ToGrpcMessage();
 
-        var oid = new ObjectID { Value = hdr.Sha256() };
+        var restBytes = args.FullLength - args.CurrentStreamPosition;
 
-        var initRequest = new PutRequest
+        chunkSize = (int)Math.Min(restBytes, (ulong)chunkSize);
+        
+        var chunkBuffer = ArrayPool<byte>.Shared.Rent(chunkSize);
+        var sentBytes = 0;
+
+        // 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);
+
+        while (objectLimitSize == 0 || sentBytes < objectLimitSize)
         {
-            Body = new PutRequest.Types.Body
+            // send chanks limited to default or user's settings
-            {
+            var bufferSize = objectLimitSize > 0 ? 
-                Init = new PutRequest.Types.Body.Types.Init
+                (int)Math.Min(objectLimitSize - sentBytes, chunkSize)
-                {
+                : chunkSize;
-                    Header = hdr
-                }
-            }
-        };
 
-        var sessionToken = await GetOrCreateSession(args, ctx);
+            var bytesCount = await payload.ReadAsync(chunkBuffer, 0, bufferSize, ctx.CancellationToken);
-
-        sessionToken.CreateObjectTokenContext(
-            new Address { ContainerId = hdr.ContainerId, ObjectId = oid },
-            ObjectSessionContext.Types.Verb.Put,
-            Context.Key
-        );
-
-        initRequest.AddMetaHeader(args.XHeaders, sessionToken);
-
-        initRequest.Sign(Context.Key);
-
-        using var stream = await PutObjectInit(initRequest, ctx);
-
-        var bufferSize = args.BufferMaxSize > 0 ? args.BufferMaxSize : Constants.ObjectChunkSize;
-
-        if (payload.CanSeek)
-        {
-            bufferSize = (int)Math.Min(payload.Length, bufferSize);
-        }
-        else if (header.PayloadLength > 0)
-        {
-            bufferSize = (int)Math.Min((long)header.PayloadLength, bufferSize);
-        }
-
-        var buffer = new byte[bufferSize];
-
-        while (true)
-        {
-            var bytesCount = await payload.ReadAsync(buffer, 0, bufferSize, ctx.CancellationToken);
 
             if (bytesCount == 0)
                 break;
 
-            var chunkRequest = new PutRequest(initRequest)
+            sentBytes += bytesCount;
+
+            var chunkRequest = new PutRequest
             {
                 Body = new PutRequest.Types.Body
                 {
-                    Chunk = ByteString.CopyFrom(buffer.AsSpan()[..bytesCount]),
+                    Chunk = ByteString.CopyFrom(chunkBuffer, 0, bytesCount)
-                },
+                }
-                VerifyHeader = null
             };
 
-            chunkRequest.Sign(Context.Key);
+            chunkRequest.Sign(Context.Key.ECDsaKey);
 
             await stream.Write(chunkRequest);
         }
@@ -358,7 +345,49 @@ internal class ObjectServiceProvider(ObjectService.ObjectServiceClient client, C
         var response = await stream.Close();
         Verifier.CheckResponse(response);
 
-        return ObjectId.FromHash(response.Body.ObjectId.Value.ToByteArray());
+        return new PutObjectResult(ObjectId.FromHash(response.Body.ObjectId.Value.ToByteArray()), sentBytes);
+    }
+
+    private async Task<ObjectStreamer> GetUploadStream(PrmObjectPut args, Context ctx)
+    {
+        var header = args.Header!;
+
+        header.OwnerId = Context.Owner;
+        header.Version = Context.Version;
+
+        var grpcHeader = header.ToMessage();
+
+        if (header.Split != null)
+        {
+            ObjectTools.SetSplitValues(grpcHeader, header.Split, env);
+        }
+
+        var oid = new ObjectID { Value = grpcHeader.Sha256() };
+
+        var initRequest = new PutRequest
+        {
+            Body = new PutRequest.Types.Body
+            {
+                Init = new PutRequest.Types.Body.Types.Init
+                {
+                    Header = grpcHeader
+                }
+            }
+        };
+
+        var sessionToken = await GetOrCreateSession(args, ctx);
+
+        sessionToken.CreateObjectTokenContext(
+            new Address { ContainerId = grpcHeader.ContainerId, ObjectId = oid },
+            ObjectSessionContext.Types.Verb.Put,
+            Context.Key.ECDsaKey
+        );
+
+        initRequest.AddMetaHeader(args.XHeaders, sessionToken);
+
+        initRequest.Sign(Context.Key.ECDsaKey);
+
+        return await PutObjectInit(initRequest, ctx);
     }
 
     private async Task<FrostFsObject> GetObject(GetRequest request, Context ctx)

src/FrostFS.SDK.ClientV2/Services/SessionServiceProvider.cs

@@ -21,13 +21,13 @@ internal class SessionServiceProvider : ContextAccessor
         {
             Body = new CreateRequest.Types.Body
             {
-                OwnerId = Context.Owner.ToGrpcMessage(),
+                OwnerId = Context.Owner.ToMessage(),
                 Expiration = args.Expiration
             }
         };
 
         request.AddMetaHeader(args.XHeaders);
-        request.Sign(Context.Key);
+        request.Sign(Context.Key.ECDsaKey);
 
         return await CreateSession(request, args.Context!);
     }

src/FrostFS.SDK.ClientV2/Tools/ClientEnvironment.cs

@@ -1,7 +1,9 @@
 using FrostFS.SDK.ModelsV2;
+using Google.Protobuf;
 using Grpc.Net.Client;
 using System;
 using System.Security.Cryptography;
+using FrostFS.SDK.Cryptography;
 
 namespace FrostFS.SDK.ClientV2;
 
@@ -9,11 +11,12 @@ public class ClientEnvironment(Client client, ECDsa key, OwnerId owner, GrpcChan
 {
     internal OwnerId Owner { get; } = owner;
     internal GrpcChannel Channel { get; private set; } = channel;
-    internal ECDsa Key { get; } = key;
     internal ModelsV2.Version Version { get; } = version;
     internal NetworkSettings? NetworkSettings { get; set; }
 
-    internal Client Client { get; set; } = client;
+    internal Client Client { get; } = client;
+
+    internal ClientKey Key { get; } = new ClientKey(key);
 
     public void Dispose()
     {

src/FrostFS.SDK.ClientV2/Tools/ObjectTools.cs

@@ -7,54 +7,36 @@ using FrostFS.Refs;
 using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.Cryptography;
 using FrostFS.SDK.ModelsV2;
+using static FrostFS.Object.Header.Types;
 
 namespace FrostFS.SDK.ClientV2;
 
-internal class ObjectTools(ClientEnvironment ctx) : ContextAccessor (ctx)
+internal class ObjectTools
 {
-    internal ObjectId CalculateObjectId(ObjectHeader header)
+    internal static ObjectId CalculateObjectId(ObjectHeader header, ClientEnvironment env)
     { 
-        var grpcHeader = CreateHeader(header, []);
+        var grpcHeader = CreateHeader(header, [], env);
+
+        if (header.Split != null)
+            SetSplitValues(grpcHeader, header.Split, env);
 
         return new ObjectID { Value = grpcHeader.Sha256() }.ToModel();        
     }
 
-    internal Object.Object CreateObject(FrostFsObject @object)
+    internal static  Object.Object CreateObject(FrostFsObject @object, ClientEnvironment env)
     {
-        var grpcHeader = @object.Header.ToGrpcMessage();
+        @object.Header.OwnerId = env.Owner;
+        @object.Header.Version = env.Version;
+
+        var grpcHeader = @object.Header.ToMessage();
               
-        grpcHeader.OwnerId = Context.Owner.ToGrpcMessage();
-        grpcHeader.Version = Context.Version.ToGrpcMessage();
         grpcHeader.PayloadLength = (ulong)@object.Payload.Length;
         grpcHeader.PayloadHash = Sha256Checksum(@object.Payload);
 
         var split = @object.Header.Split;
         if (split != null)
         {
-            grpcHeader.Split = new Header.Types.Split
+            SetSplitValues(grpcHeader, split, env);
-            {
-                SplitId = split.SplitId != null ? ByteString.CopyFrom(split.SplitId.ToBinary()) : null                    
-            };
-
-            if (split.Children != null && split.Children.Count != 0)
-                grpcHeader.Split.Children.AddRange(split.Children.Select(id => id.ToGrpcMessage()));
-
-            if (split.ParentHeader is not null)
-            {
-                var grpcParentHeader = CreateHeader(split.ParentHeader, []);
-
-                grpcHeader.Split.Parent = new ObjectID { Value = grpcParentHeader.Sha256() };
-                grpcHeader.Split.ParentHeader = grpcParentHeader;
-                grpcHeader.Split.ParentSignature = new Refs.Signature
-                {
-                    Key = ByteString.CopyFrom(Context.Key.PublicKey()),
-                    Sign = ByteString.CopyFrom(Context.Key.SignData(grpcHeader.Split.Parent.ToByteArray())),
-                };
-
-                split.Parent = grpcHeader.Split.Parent.ToModel();
-            }
-
-            grpcHeader.Split.Previous = split.Previous?.ToGrpcMessage(); 
         }
 
         var obj = new Object.Object
@@ -66,21 +48,49 @@ internal class ObjectTools(ClientEnvironment ctx) : ContextAccessor (ctx)
 
         obj.Signature = new Refs.Signature
         {
-            Key = ByteString.CopyFrom(Context.Key.PublicKey()),
+            Key = env.Key.PublicKeyProto,
-            Sign = ByteString.CopyFrom(Context.Key.SignData(obj.ObjectId.ToByteArray())),
+            Sign = ByteString.CopyFrom(env.Key.ECDsaKey.SignData(obj.ObjectId.ToByteArray())),
         };        
       
         return obj;
     }
 
-    internal Header CreateHeader(ObjectHeader header, byte[]? payload)
+    internal static void SetSplitValues(Header grpcHeader, ModelsV2.Split split, ClientEnvironment env)
     {
-        var grpcHeader = header.ToGrpcMessage();
+        grpcHeader.Split = new Header.Types.Split
+        {
+            SplitId = split.SplitId != null ? ByteString.CopyFrom(split.SplitId.ToBinary()) : null
+        };
 
-        grpcHeader.OwnerId = Context.Owner.ToGrpcMessage();
+        if (split.Children != null && split.Children.Count != 0)
-        grpcHeader.Version = Context.Version.ToGrpcMessage();
+            grpcHeader.Split.Children.AddRange(split.Children.Select(id => id.ToMessage()));
 
-        if (payload != null)    
+        if (split.ParentHeader is not null)
+        {
+            var grpcParentHeader = CreateHeader(split.ParentHeader, [], env);
+
+            grpcHeader.Split.Parent = new ObjectID { Value = grpcParentHeader.Sha256() };
+            grpcHeader.Split.ParentHeader = grpcParentHeader;
+            grpcHeader.Split.ParentSignature = new Refs.Signature
+            {
+                Key = env.Key.PublicKeyProto,
+                Sign = ByteString.CopyFrom(env.Key.ECDsaKey.SignData(grpcHeader.Split.Parent.ToByteArray())),
+            };
+
+            split.Parent = grpcHeader.Split.Parent.ToModel();
+        }
+
+        grpcHeader.Split.Previous = split.Previous?.ToMessage();
+    }
+
+    internal static Header CreateHeader(ObjectHeader header, byte[]? payload, ClientEnvironment env)
+    {
+        var grpcHeader = header.ToMessage();
+       
+        grpcHeader.OwnerId = env.Owner.ToMessage();
+        grpcHeader.Version = env.Version.ToMessage();
+
+        if (payload != null) //  && payload.Length > 0    
             grpcHeader.PayloadHash = Sha256Checksum(payload);
        
         return grpcHeader;

src/FrostFS.SDK.ClientV2/Tools/RequestConstructor.cs

@@ -17,7 +17,7 @@ public static class RequestConstructor
         if (request.MetaHeader is not null) 
             return;
 
-        request.MetaHeader = MetaHeader.Default().ToGrpcMessage();
+        request.MetaHeader = MetaHeader.Default().ToMessage();
 
         if (sessionToken != null)
             request.MetaHeader.SessionToken = sessionToken;

src/FrostFS.SDK.ClientV2/Tools/RequestSigner.cs

@@ -69,7 +69,7 @@ public static class RequestSigner
         var hash = new byte[65];
         hash[0] = 0x04;
 
-        key.SignHash(SHA512.Create().ComputeHash(data)).CopyTo(hash, 1);
+        key.SignHash(data.Sha512()).CopyTo(hash, 1);
 
         return hash;
     }

src/FrostFS.SDK.ClientV2/Tools/Verifier.cs

@@ -60,7 +60,7 @@ public static class Verifier
 
     public static bool VerifyData(this ECDsa key, byte[] data, byte[] sig)
     {
-        return key.VerifyHash(SHA512.Create().ComputeHash(data), sig[1..]);
+        return key.VerifyHash(data.Sha512(), sig[1..]);
     }
 
     public static bool VerifyMessagePart(this Signature sig, IMessage data)
@@ -101,7 +101,8 @@ public static class Verifier
             throw new FormatException($"invalid response, type={resp.GetType()}");
      
         var status = resp.MetaHeader.Status.ToModel();
-        if (!status.IsSuccess)
+
+        if (status != null && !status.IsSuccess)
             throw new ResponseException(status);
     }
 

src/FrostFS.SDK.Cryptography/Base58.cs

@@ -65,7 +65,7 @@ public static class Base58
 
         var firstNonZeroIndex = 0;
 
-        while(bytesBigEndian.ElementAt(firstNonZeroIndex) == 0x0)
+        while (bytesBigEndian.ElementAt(firstNonZeroIndex) == 0x0)
             firstNonZeroIndex++;
 
         var bytesWithoutLeadingZeros = bytesBigEndian.Skip(firstNonZeroIndex).ToArray();

src/FrostFS.SDK.Cryptography/Extentions.cs

@@ -1,11 +1,18 @@
 using Google.Protobuf;
 using Org.BouncyCastle.Crypto.Digests;
 using System.Security.Cryptography;
+using System.Threading;
 
 namespace FrostFS.SDK.Cryptography;
 
 public static class Extentions
 {
+    private static readonly SHA256 _sha256 = SHA256.Create();
+    private static SpinLock _spinlockSha256 = new();
+
+    private static readonly SHA512 _sha512 = SHA512.Create();
+    private static SpinLock _spinlockSha512 = new();
+
     internal static byte[] RIPEMD160(this byte[] value)
     {
         var hash = new byte[20];
@@ -16,14 +23,40 @@ public static class Extentions
         return hash;
     }
     
-    public static byte[] Sha256(this byte[] value)
-    {
-        var sha256 = SHA256.Create();
-        return sha256.ComputeHash(value);
-    }
-    
     public static ByteString Sha256(this IMessage data)
     {
         return ByteString.CopyFrom(data.ToByteArray().Sha256());
     }
+
+    public static byte[] Sha256(this byte[] value)
+    {
+        bool lockTaken = false;
+        try
+        {
+            _spinlockSha256.Enter(ref lockTaken);
+
+            return _sha256.ComputeHash(value);
+        }
+        finally
+        {
+            if (lockTaken)
+                _spinlockSha256.Exit(false);
+        }
+    }
+
+    public static byte[] Sha512(this byte[] value)
+    {
+        bool lockTaken = false;
+        try
+        {
+            _spinlockSha512.Enter(ref lockTaken);
+
+            return _sha512.ComputeHash(value);
+        }
+        finally
+        {
+            if (lockTaken)
+                _spinlockSha512.Exit(false);
+        }
+    }
 }

src/FrostFS.SDK.Cryptography/Key.cs

@@ -133,8 +133,9 @@ public static class KeyExtension
     public static ECDsa LoadPrivateKey(this byte[] privateKey)
     {
         var secp256R1 = SecNamedCurves.GetByName("secp256r1");
-        var publicKey =
+        var publicKey = secp256R1.G.Multiply(new Org.BouncyCastle.Math.BigInteger(1, privateKey))
-            secp256R1.G.Multiply(new Org.BouncyCastle.Math.BigInteger(1, privateKey)).GetEncoded(false)[1..];
+            .GetEncoded(false)[1..];
+
         var key = ECDsa.Create(new ECParameters
         {
             Curve = ECCurve.NamedCurves.nistP256,

src/FrostFS.SDK.Cryptography/Murmur3_128.cs

@@ -112,7 +112,7 @@ internal class Murmur3_128 : HashAlgorithm
         h2 = seed;
     }
 
-    private ulong Fimix64(ulong k)
+    private static ulong Fimix64(ulong k)
     {
         k ^= k >> 33;
         k *= 0xff51afd7ed558ccd;

src/FrostFS.SDK.Cryptography/Range.cs

@@ -77,14 +77,7 @@ namespace System
         {
             get
             {
-                if (_value < 0)
+                return _value < 0 ? ~_value : _value;
-                {
-                    return ~_value;
-                }
-                else
-                {
-                    return _value;
-                }
             }
         }
 
@@ -105,12 +98,9 @@ namespace System
             var offset = _value;
             if (IsFromEnd)
             {
-                // offset = length - (~value)
-                // offset = length + (~(~value) + 1)
-                // offset = length + value + 1
-
                 offset += length + 1;
             }
+
             return offset;
         }
 

src/FrostFS.SDK.ModelsV2/FrostFS.SDK.ModelsV2.csproj

@@ -16,6 +16,7 @@
 	
   <ItemGroup>
     <ProjectReference Include="..\FrostFS.SDK.Cryptography\FrostFS.SDK.Cryptography.csproj" />
+    <ProjectReference Include="..\FrostFS.SDK.ProtosV2\FrostFS.SDK.ProtosV2.csproj" />
   </ItemGroup>
 
 </Project>

src/FrostFS.SDK.ModelsV2/Misc/CheckSum.cs

@@ -1,3 +1,4 @@
+using FrostFS.SDK.Cryptography;
 using System;
 using System.Security.Cryptography;
 
@@ -8,15 +9,9 @@ public class CheckSum
     // type is always Sha256
     public byte[]? Hash { get; set; } 
 
-    public static byte[] GetHash(byte[] content)
-    {
-        var sha256 = SHA256.Create();
-        return sha256.ComputeHash(content);
-    }
-
     public static CheckSum CreateCheckSum(byte[] content)
     {
-        return new CheckSum { Hash = GetHash(content) };
+        return new CheckSum { Hash = content.Sha256() };
     }
 
     public override string ToString()

src/FrostFS.SDK.ModelsV2/Object/FrostFsObject.cs

@@ -56,19 +56,17 @@ public class FrostFsObject
     /// Applied only for the last Object in chain in case of manual multipart uploading
     /// </summary>
     /// <param name="largeObject">Parent for multipart object</param>
-    public void SetParent(LargeObject largeObject)
+    public void SetParent(ObjectHeader largeObjectHeader)
     {
         if (Header?.Split == null)
             throw new Exception("The object is not initialized properly");
 
-        Header.Split.ParentHeader = largeObject.Header;
+        Header.Split.ParentHeader = largeObjectHeader;
     }
 }
 
 public class LargeObject(ContainerId container) : FrostFsObject(container)
 {
-    private readonly SHA256 payloadHash = SHA256.Create();
-
     public ulong PayloadLength
     {
         get { return Header!.PayloadLength; }
@@ -77,11 +75,11 @@ public class LargeObject(ContainerId container) : FrostFsObject(container)
 
 public class LinkObject : FrostFsObject
 {
-    public LinkObject(ContainerId containerId, SplitId splitId, LargeObject largeObject) : base (containerId)
+    public LinkObject(ContainerId containerId, SplitId splitId, ObjectHeader largeObjectHeader) : base (containerId)
     {
         Header!.Split = new Split(splitId)
         {
-            ParentHeader = largeObject.Header            
+            ParentHeader = largeObjectHeader            
         };
     }
 }

src/FrostFS.SDK.ModelsV2/Object/Splitter.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 
+
 namespace FrostFS.SDK.ModelsV2;
 
 public class Split(SplitId splitId)
@@ -19,4 +20,6 @@ public class Split(SplitId splitId)
     public ObjectHeader? ParentHeader { get; set; }
 
     public List<ObjectId> Children { get; } = [];
+
+    public Refs.Signature ParentSignatureGrpc { get; set; }
 }

src/FrostFS.SDK.ModelsV2/Response/ResponseStatus.cs

@@ -2,7 +2,7 @@ using FrostFS.SDK.ModelsV2.Enums;
 
 namespace FrostFS.SDK.ModelsV2;
 
-public class Status(StatusCode code, string? message = null)
+public class ResponseStatus(StatusCode code, string? message = null)
 {
     public StatusCode Code { get; set; } = code;
     public string Message { get; set; } = message ?? string.Empty;

src/FrostFS.SDK.Tests/ContainerTest.cs

@@ -110,6 +110,6 @@ public class ContainerTest : ContainerTestsBase
 
         var request = Mocker.Requests.First();
         
-        Assert.Equal(cid.ToGrpcMessage(), request.Request.Body.ContainerId);        
+        Assert.Equal(cid.ToMessage(), request.Request.Body.ContainerId);        
     }
 }

src/FrostFS.SDK.Tests/Mocks/AsyncStreamReaderMock.cs

@@ -19,14 +19,14 @@ public class AsyncStreamReaderMock(string key, ObjectHeader objectHeader) : Serv
         {
             var header = new Header
             {
-                ContainerId =  objectHeader.ContainerId.ToGrpcMessage(),
+                ContainerId =  objectHeader.ContainerId.ToMessage(),
                 PayloadLength = objectHeader.PayloadLength,
-                Version = objectHeader.Version!.ToGrpcMessage(),
+                Version = objectHeader.Version!.ToMessage(),
-                OwnerId = objectHeader.OwnerId!.ToGrpcMessage()
+                OwnerId = objectHeader.OwnerId!.ToMessage()
             };
 
             foreach (var attr in objectHeader.Attributes)
-                header.Attributes.Add(attr.ToGrpcMessage());
+                header.Attributes.Add(attr.ToMessage());
 
             var response = new GetResponse
             {

src/FrostFS.SDK.Tests/Mocks/ContainerServiceMocks/ContainerServiceBase.cs

@@ -27,7 +27,7 @@ public abstract class ServiceBase(string key)
     public static BasicAcl DefaultAcl { get; } = BasicAcl.PublicRW;
     public static PlacementPolicy DefaultPlacementPolicy { get; } = new PlacementPolicy(true, new Replica(1));
 
-    public Metadata ResponseMetaData => [];
+    public static Metadata ResponseMetaData => [];
 
     protected ResponseVerificationHeader GetResponseVerificationHeader(IResponse response)
     {
@@ -58,7 +58,7 @@ public abstract class ServiceBase(string key)
 
     public ResponseMetaHeader ResponseMetaHeader => new()
         {
-            Version = Version.ToGrpcMessage(),
+            Version = Version.ToMessage(),
             Epoch = 100,
             Ttl = 1
         };

src/FrostFS.SDK.Tests/Mocks/ContainerServiceMocks/GetContainerMock.cs

@@ -19,7 +19,7 @@ public class ContainerMocker(string key) : ContainerServiceBase(key)
     {
         var mock = new Mock<ContainerService.ContainerServiceClient>();
 
-        var grpcVersion = Version.ToGrpcMessage();
+        var grpcVersion = Version.ToMessage();
 
         PutResponse putResponse = new()
         {
@@ -32,7 +32,7 @@ public class ContainerMocker(string key) : ContainerServiceBase(key)
             },
             MetaHeader = new ResponseMetaHeader
             {
-                Version = Version is null ? DefaultVersion.ToGrpcMessage() : Version.ToGrpcMessage(),
+                Version = (Version is null ? DefaultVersion : Version).ToMessage(),
                 Epoch = 100,
                 Ttl = 1
             }
@@ -69,7 +69,7 @@ public class ContainerMocker(string key) : ContainerServiceBase(key)
                     Version = grpcVersion,
                     Nonce = ByteString.CopyFrom(ContainerGuid.ToBytes()),
                     BasicAcl = (uint)Acl,
-                    PlacementPolicy = PlacementPolicy.ToGrpcMessage()
+                    PlacementPolicy = PlacementPolicy.ToMessage()
                 }
             },
             MetaHeader = ResponseMetaHeader

src/FrostFS.SDK.Tests/Mocks/ObjectMock.cs

@@ -38,12 +38,12 @@ public class ObjectMocker(string key) : ObjectServiceBase(key)
             HeadResponse ??= new Header
             {
                 CreationEpoch = 99,
-                ContainerId = ObjectHeader.ContainerId.ToGrpcMessage(),
+                ContainerId = ObjectHeader.ContainerId.ToMessage(),
                 ObjectType = ObjectType.Regular,
-                OwnerId = ObjectHeader.OwnerId!.ToGrpcMessage(),
+                OwnerId = ObjectHeader.OwnerId!.ToMessage(),
                 PayloadLength = 1,
                 PayloadHash = new Refs.Checksum { Type = Refs.ChecksumType.Sha256, Sum = ByteString.CopyFrom(SHA256.HashData([0xff])) },
-                Version = ObjectHeader.Version!.ToGrpcMessage()
+                Version = ObjectHeader.Version!.ToMessage()
             };
 
             HeadResponse headResponse = new()
@@ -89,7 +89,7 @@ public class ObjectMocker(string key) : ObjectServiceBase(key)
 
         }
 
-        if (ResultObjectId != null)
+        if (ResultObjectIds != null)
         {
             PutResponse putResponse = new()
             {
@@ -97,7 +97,7 @@ public class ObjectMocker(string key) : ObjectServiceBase(key)
                 {
                     ObjectId = new Refs.ObjectID
                     {
-                        Value = ByteString.CopyFrom(ResultObjectId)
+                        Value = ByteString.CopyFrom(ResultObjectIds.ElementAt(0))
                     }
                 },
                 MetaHeader = ResponseMetaHeader,
@@ -156,8 +156,8 @@ public class ObjectMocker(string key) : ObjectServiceBase(key)
                 {
                     Tombstone = new Refs.Address
                     {
-                        ContainerId = ObjectHeader!.ContainerId.ToGrpcMessage(),
+                        ContainerId = ObjectHeader!.ContainerId.ToMessage(),
-                        ObjectId = ObjectId.ToGrpcMessage()
+                        ObjectId = ObjectId.ToMessage()
                     }
                 },
                 MetaHeader = ResponseMetaHeader
@@ -195,7 +195,7 @@ public class ObjectMocker(string key) : ObjectServiceBase(key)
 
     public Header? HeadResponse { get; set; }
 
-    public byte[]? ResultObjectId { get; set; }
+    public List<byte[]>? ResultObjectIds { get; set; }
 
     public ClientStreamWriter? ClientStreamWriter { get; private set; } = new ();
 

src/FrostFS.SDK.Tests/ObjectTest.cs

@@ -7,6 +7,7 @@ using FrostFS.SDK.Cryptography;
 using FrostFS.SDK.ModelsV2;
 using FrostFS.SDK.ModelsV2.Enums;
 using FrostFS.SDK.ModelsV2.Netmap;
+using FrostFS.SDK.ProtosV2.Interfaces;
 using Google.Protobuf;
 using Microsoft.Extensions.Options;
 using System.Security.Cryptography;
@@ -82,7 +83,7 @@ public class ObjectTest : ObjectTestsBase
         Assert.NotNull(result);
 
         Assert.Equal(Mocker.ObjectHeader!.ContainerId.Value, result.Header.ContainerId.Value);
-        Assert.Equal(Mocker.ObjectHeader!.OwnerId!.ToGrpcMessage().ToString(), result.Header.OwnerId!.Value);
+        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);
@@ -92,7 +93,7 @@ public class ObjectTest : ObjectTestsBase
     [Fact]
     public async void PutObjectTest()
     {
-        Mocker.ResultObjectId = SHA256.HashData([]);
+        Mocker.ResultObjectIds = new([SHA256.HashData([])]);
        
         Random rnd = new();
         var bytes = new byte[1024];
@@ -113,7 +114,7 @@ public class ObjectTest : ObjectTestsBase
         var body2 = sentMessages.ElementAt(1).GetBody() as Object.PutRequest.Types.Body;
 
         Assert.NotNull(result);
-        Assert.Equal(Mocker.ResultObjectId, result.ToHash());
+        Assert.Equal(Mocker.ResultObjectIds.First(), result.ToHash());
        
         Assert.True(Mocker.ClientStreamWriter.CompletedTask);
 
@@ -137,57 +138,85 @@ public class ObjectTest : ObjectTestsBase
         {
             Header = Mocker.ObjectHeader,
             Payload = new MemoryStream(bytes),
+            BufferMaxSize = 1024,
             ClientCut = true
         };
 
+        Random rnd = new();
+
+        List<byte[]> objIds = new([new byte[32], new byte[32], new byte[32]]);
+        rnd.NextBytes(objIds.ElementAt(0));
+        rnd.NextBytes(objIds.ElementAt(1));
+        rnd.NextBytes(objIds.ElementAt(2));
+
+        Mocker.ResultObjectIds = objIds;
+
         var result = await GetClient().PutObjectAsync(param);
 
-        var sentMessages = Mocker.PutSingleRequests.ToArray();
+        var singleObjects = Mocker.PutSingleRequests.ToArray();
 
-        Assert.Equal(4, sentMessages.Length);
+        var streamObjects = Mocker.ClientStreamWriter.Messages.ToArray();
 
-        var object_0 = sentMessages[0].Body.Object;
+        Assert.Single(singleObjects);
-        var object_1 = sentMessages[1].Body.Object;
-        var object_2 = sentMessages[2].Body.Object;
-        var object_3 = sentMessages[3].Body.Object;
 
-        Assert.NotNull(object_0.Header.Split.SplitId);
+        Assert.Equal(11, streamObjects.Length);
-        Assert.Null(object_0.Header.Split.Previous);
-        Assert.Equal(blockSize, (int)object_0.Header.PayloadLength);
-        Assert.Equal(bytes[..blockSize], object_0.Payload);
-        Assert.True(object_0.Header.Attributes.Count == 0);
 
-        Assert.Equal(object_0.Header.Split.SplitId, object_1.Header.Split.SplitId);
+        var bodies = streamObjects.Select(o => ((Object.PutRequest)o).Body).ToArray();
-        Assert.Equal(object_0.ObjectId, object_1.Header.Split.Previous);
+
-        Assert.Equal(blockSize, (int)object_1.Header.PayloadLength);
+        Assert.Equal(3, bodies.Count(b => b.Init != null));
-        Assert.Equal(bytes[blockSize..(blockSize * 2)], object_1.Payload);
+        Assert.Equal(5, bodies.Count(b => b.Chunk.Length == 1024));
-        Assert.True(object_1.Header.Attributes.Count == 0);
+
+        Assert.Equal(596, ((Object.PutRequest)streamObjects[10]).Body.Chunk.Length);
+
+        var linkObject = singleObjects[0].Body.Object;
+        var header1 = bodies[0].Init.Header;
+        var header2 = bodies[4].Init.Header;
+        var header3 = bodies[8].Init.Header;
+
+        var payload1 = bodies[1].Chunk
+            .Concat(bodies[2].Chunk)
+            .Concat(bodies[3].Chunk)
+            .ToArray();
+
+        var payload2 = bodies[5].Chunk
+           .Concat(bodies[6].Chunk)
+           .Concat(bodies[7].Chunk)
+           .ToArray();
+
+        var payload3 = bodies[9].Chunk
+           .Concat(bodies[10].Chunk)
+           .ToArray();
+
+        Assert.NotNull(header1.Split.SplitId);
+        Assert.Null(header1.Split.Previous);
+        Assert.Equal(bytes[..blockSize], payload1);
+        Assert.True(header1.Attributes.Count == 0);
+
+        Assert.Equal(header1.Split.SplitId, header2.Split.SplitId);
+        Assert.Equal(objIds.ElementAt(0), header2.Split.Previous.Value);
+        Assert.Equal(bytes[blockSize..(blockSize * 2)], payload2);
+        Assert.True(header2.Attributes.Count == 0);
 
         // last part
-        Assert.NotNull(object_2.Header.Split.Parent);
+        Assert.NotNull(header3.Split.Parent);
-        Assert.NotNull(object_2.Header.Split.ParentHeader);
+        Assert.NotNull(header3.Split.ParentHeader);
-        Assert.NotNull(object_2.Header.Split.ParentSignature);
+        Assert.NotNull(header3.Split.ParentSignature);
-        Assert.Equal(object_1.Header.Split.SplitId, object_2.Header.Split.SplitId);
+        Assert.Equal(header2.Split.SplitId, header3.Split.SplitId);
-        Assert.Equal(object_1.ObjectId, object_2.Header.Split.Previous);
+        Assert.Equal(bytes[((fileLength / blockSize) * blockSize)..fileLength], payload3);
-        Assert.Equal(fileLength%blockSize, (int)object_2.Header.PayloadLength);
+        Assert.True(header3.Attributes.Count == 0);
-        Assert.Equal(bytes[((fileLength/blockSize) * blockSize)..fileLength], object_2.Payload);
-        Assert.True(object_2.Header.Attributes.Count == 0);
 
-        // link object
+        //link object
-        Assert.Equal(object_2.Header.Split.Parent, object_3.Header.Split.Parent);
+        Assert.Equal(header3.Split.Parent, linkObject.Header.Split.Parent);
-        Assert.Equal(object_2.Header.Split.ParentHeader, object_3.Header.Split.ParentHeader);
+        Assert.Equal(header3.Split.ParentHeader, linkObject.Header.Split.ParentHeader);
-        Assert.Equal(object_2.Header.Split.SplitId, object_3.Header.Split.SplitId);
+        Assert.Equal(header3.Split.SplitId, linkObject.Header.Split.SplitId);
-        Assert.Equal(0, (int)object_3.Header.PayloadLength);
+        Assert.Equal(0, (int)linkObject.Header.PayloadLength);
-        Assert.Contains(object_0.ObjectId, object_3.Header.Split.Children);
+        Assert.True(header3.Attributes.Count == 0);
-        Assert.Contains(object_2.ObjectId, object_3.Header.Split.Children);
-        Assert.Contains(object_2.ObjectId, object_3.Header.Split.Children);
-        Assert.True(object_2.Header.Attributes.Count == 0);
 
-        Assert.Single(object_3.Header.Split.ParentHeader.Attributes);
+        Assert.Single(linkObject.Header.Split.ParentHeader.Attributes);
-        Assert.Equal("k", object_3.Header.Split.ParentHeader.Attributes[0].Key);
+        Assert.Equal("k", linkObject.Header.Split.ParentHeader.Attributes[0].Key);
-        Assert.Equal("v", object_3.Header.Split.ParentHeader.Attributes[0].Value);
+        Assert.Equal("v", linkObject.Header.Split.ParentHeader.Attributes[0].Value);
 
-        var modelObjId = ObjectId.FromHash(object_3.Header.Split.Parent.Value.ToByteArray());
+        var modelObjId = ObjectId.FromHash(linkObject.Header.Split.Parent.Value.ToByteArray());
 
         Assert.Equal(result.Value, modelObjId.ToString());
     }
@@ -201,8 +230,8 @@ public class ObjectTest : ObjectTestsBase
 
         var request = Mocker.DeleteRequests.FirstOrDefault();
         Assert.NotNull(request);
-        Assert.Equal(ContainerId.ToGrpcMessage(), request.Body.Address.ContainerId);
+        Assert.Equal(ContainerId.ToMessage().Value, request.Body.Address.ContainerId.Value);
-        Assert.Equal(Mocker.ObjectId.ToGrpcMessage(), request.Body.Address.ObjectId);
+        Assert.Equal(Mocker.ObjectId.ToMessage().Value, request.Body.Address.ObjectId.Value);
     }
 
     [Fact]
@@ -214,13 +243,13 @@ public class ObjectTest : ObjectTestsBase
 
         var request = Mocker.HeadRequests.FirstOrDefault();
         Assert.NotNull(request);
-        Assert.Equal(ContainerId.ToGrpcMessage(), request.Body.Address.ContainerId);
+        Assert.Equal(ContainerId.ToMessage(), request.Body.Address.ContainerId);
-        Assert.Equal(Mocker.ObjectId.ToGrpcMessage(), request.Body.Address.ObjectId);
+        Assert.Equal(Mocker.ObjectId.ToMessage(), request.Body.Address.ObjectId);
 
         Assert.NotNull(response);
         Assert.Equal(ContainerId.Value, response.ContainerId.Value);
 
-        Assert.Equal(Mocker.ObjectHeader!.OwnerId!.ToGrpcMessage().ToString(), response.OwnerId!.Value);
+        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);

src/FrostFS.SDK.Tests/SmokeTests.cs

@@ -72,13 +72,14 @@ public class SmokeTests
     [Fact]
     public async void GetSessionTest()
     {
+        var ecdsaKey = this.key.LoadWif();
+
         using var client = Client.GetInstance(GetOptions(this.key, this.url));
 
         var token = await client.CreateSessionAsync(new PrmSessionCreate(100));
 
         var session = new Session.SessionToken().Deserialize(token.Token);
 
-        var ecdsaKey = this.key.LoadWif();
         var owner = OwnerId.FromKey(ecdsaKey);
 
         var ownerHash = Base58.Decode(owner.Value);
@@ -217,9 +218,10 @@ public class SmokeTests
         await foreach (var objId in client.SearchObjectsAsync(searchParam))
         {
             resultObjectsCount++;
+            var objHeader = await client.GetObjectHeadAsync(new PrmObjectHeadGet(containerId, objId));
         }
 
-        Assert.True(1 == resultObjectsCount, $"Filter for {filter.Key} doesn't work");
+        Assert.True(0 < resultObjectsCount, $"Filter for {filter.Key} doesn't work");
     }
 
     [Theory]
@@ -449,8 +451,8 @@ public class SmokeTests
             var objHeader = await client.GetObjectHeadAsync(new PrmObjectHeadGet(containerId, objectId));
             Assert.Equal((ulong)bytes.Length, objHeader.PayloadLength);
             Assert.Single(objHeader.Attributes);
-            Assert.Equal("fileName", objHeader.Attributes.First().Key);
+            Assert.Equal("fileName", objHeader.Attributes[0].Key);
-            Assert.Equal("test", objHeader.Attributes.First().Value);
+            Assert.Equal("test", objHeader.Attributes[0].Value);
         }
 
         Assert.True(hasObject);
@@ -542,7 +544,7 @@ public class MetricsInterceptor() : Interceptor
 
         watch.Stop();
 
-        // Do somethins with call info
+        // Do something with call info
         // var elapsed = watch.ElapsedTicks * 1_000_000/Stopwatch.Frequency;
 
         return response;