diff --git a/util/proto/test/test.pb.go b/util/proto/test/test.pb.go
index f581442..0254baa 100644
--- a/util/proto/test/test.pb.go
+++ b/util/proto/test/test.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.23.0
-// 	protoc        v3.13.0
+// 	protoc        v3.14.0
 // source: util/proto/test/test.proto
 
 package test
diff --git a/v2/accounting/grpc/service.pb.go b/v2/accounting/grpc/service.pb.go
index 2f29d12..7e6a461 100644
--- a/v2/accounting/grpc/service.pb.go
+++ b/v2/accounting/grpc/service.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.23.0
-// 	protoc        v3.13.0
+// 	protoc        v3.14.0
 // source: v2/accounting/grpc/service.proto
 
 package accounting
diff --git a/v2/accounting/grpc/types.pb.go b/v2/accounting/grpc/types.pb.go
index dd62f96..84ecf9f 100644
--- a/v2/accounting/grpc/types.pb.go
+++ b/v2/accounting/grpc/types.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.23.0
-// 	protoc        v3.13.0
+// 	protoc        v3.14.0
 // source: v2/accounting/grpc/types.proto
 
 package accounting
diff --git a/v2/acl/grpc/types.pb.go b/v2/acl/grpc/types.pb.go
index fe81184..3d0f0e1 100644
--- a/v2/acl/grpc/types.pb.go
+++ b/v2/acl/grpc/types.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.23.0
-// 	protoc        v3.13.0
+// 	protoc        v3.14.0
 // source: v2/acl/grpc/types.proto
 
 package acl
diff --git a/v2/container/grpc/service.pb.go b/v2/container/grpc/service.pb.go
index 68d8392..809418f 100644
--- a/v2/container/grpc/service.pb.go
+++ b/v2/container/grpc/service.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.23.0
-// 	protoc        v3.13.0
+// 	protoc        v3.14.0
 // source: v2/container/grpc/service.proto
 
 package container
diff --git a/v2/container/grpc/types.pb.go b/v2/container/grpc/types.pb.go
index f5232e5..f23cad5 100644
--- a/v2/container/grpc/types.pb.go
+++ b/v2/container/grpc/types.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.23.0
-// 	protoc        v3.13.0
+// 	protoc        v3.14.0
 // source: v2/container/grpc/types.proto
 
 package container
@@ -41,7 +41,7 @@ type Container struct {
 	Version *grpc.Version `protobuf:"bytes,1,opt,name=version,proto3" json:"version,omitempty"`
 	// Identifier of the container owner
 	OwnerId *grpc.OwnerID `protobuf:"bytes,2,opt,name=owner_id,json=ownerID,proto3" json:"owner_id,omitempty"`
-	// Nonce is a 16 byte UUID, used to avoid collisions of container id
+	// Nonce is a 16 byte UUIDv4, used to avoid collisions of `ContainerID`s
 	Nonce []byte `protobuf:"bytes,3,opt,name=nonce,proto3" json:"nonce,omitempty"`
 	// `BasicACL` contains access control rules for owner, system, others groups
 	// and permission bits for `BearerToken` and `Extended ACL`
@@ -127,8 +127,10 @@ func (x *Container) GetPlacementPolicy() *grpc1.PlacementPolicy {
 }
 
 // `Attribute` is a user-defined Key-Value metadata pair attached to the
-// container. Container attribute are immutable. They are set at container
-// creation and cna never be added or updated.
+// container. Container attributes are immutable. They are set at container
+// creation and can never be added or updated.
+//
+// Key name must be a valid UTF-8 string. Value can't be empty.
 //
 // There are some "well-known" attributes affecting system behaviour:
 //
diff --git a/v2/netmap/grpc/service.pb.go b/v2/netmap/grpc/service.pb.go
index 721f282..70de9ab 100644
--- a/v2/netmap/grpc/service.pb.go
+++ b/v2/netmap/grpc/service.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.23.0
-// 	protoc        v3.13.0
+// 	protoc        v3.14.0
 // source: v2/netmap/grpc/service.proto
 
 package netmap
diff --git a/v2/netmap/grpc/types.pb.go b/v2/netmap/grpc/types.pb.go
index b7347eb..178d975 100644
--- a/v2/netmap/grpc/types.pb.go
+++ b/v2/netmap/grpc/types.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.23.0
-// 	protoc        v3.13.0
+// 	protoc        v3.14.0
 // source: v2/netmap/grpc/types.proto
 
 package netmap
@@ -604,6 +604,9 @@ func (x *NodeInfo) GetState() NodeInfo_State {
 
 // Administrator-defined Attributes of the NeoFS Storage Node.
 //
+// `Attribute` is a Key-Value metadata pair. Key name must be a valid UTF-8
+// string. Value can't be empty.
+//
 // Node's attributes are mostly used during Storage Policy evaluation to
 // calculate object's placement and find a set of nodes satisfying policy
 // requirements. There are some "well-known" node attributes common to all the
diff --git a/v2/object/grpc/service.pb.go b/v2/object/grpc/service.pb.go
index 9b70a42..890ac96 100644
--- a/v2/object/grpc/service.pb.go
+++ b/v2/object/grpc/service.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.23.0
-// 	protoc        v3.13.0
+// 	protoc        v3.14.0
 // source: v2/object/grpc/service.proto
 
 package object
@@ -1627,6 +1627,9 @@ type DeleteResponse_Body struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
+
+	// Address of the tombstone created for the deleted object
+	Tombstone *grpc1.Address `protobuf:"bytes,1,opt,name=tombstone,proto3" json:"tombstone,omitempty"`
 }
 
 func (x *DeleteResponse_Body) Reset() {
@@ -1661,6 +1664,13 @@ func (*DeleteResponse_Body) Descriptor() ([]byte, []int) {
 	return file_v2_object_grpc_service_proto_rawDescGZIP(), []int{5, 0}
 }
 
+func (x *DeleteResponse_Body) GetTombstone() *grpc1.Address {
+	if x != nil {
+		return x.Tombstone
+	}
+	return nil
+}
+
 // Object HEAD request body
 type HeadRequest_Body struct {
 	state         protoimpl.MessageState
@@ -1925,7 +1935,7 @@ func (x *SearchRequest_Body) GetFilters() []*SearchRequest_Body_Filter {
 // * $Object:split.parent \
 //   object_id of parent
 // * $Object:split.splitID \
-//   16 byte UUID used to identify the split object hierarchy parts
+//   16 byte UUIDv4 used to identify the split object hierarchy parts
 //
 // There are some well-known filter aliases to match objects by certain
 // properties:
@@ -2482,8 +2492,8 @@ var file_v2_object_grpc_service_proto_rawDesc = []byte{
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 	0x65, 0x12, 0x39, 0x0a, 0x04, 0x62, 0x6f, 0x64, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32,
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@@ -2497,193 +2507,148 @@ var file_v2_object_grpc_service_proto_rawDesc = []byte{
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 }
 
 var (
@@ -2861,40 +2874,41 @@ var file_v2_object_grpc_service_proto_depIdxs = []int32{
 	37, // 53: neo.fs.v2.object.PutRequest.Body.Init.header:type_name -> neo.fs.v2.object.Header
 	41, // 54: neo.fs.v2.object.PutResponse.Body.object_id:type_name -> neo.fs.v2.refs.ObjectID
 	39, // 55: neo.fs.v2.object.DeleteRequest.Body.address:type_name -> neo.fs.v2.refs.Address
-	39, // 56: neo.fs.v2.object.HeadRequest.Body.address:type_name -> neo.fs.v2.refs.Address
-	7,  // 57: neo.fs.v2.object.HeadResponse.Body.header:type_name -> neo.fs.v2.object.HeaderWithSignature
-	42, // 58: neo.fs.v2.object.HeadResponse.Body.short_header:type_name -> neo.fs.v2.object.ShortHeader
-	40, // 59: neo.fs.v2.object.HeadResponse.Body.split_info:type_name -> neo.fs.v2.object.SplitInfo
-	43, // 60: neo.fs.v2.object.SearchRequest.Body.container_id:type_name -> neo.fs.v2.refs.ContainerID
-	27, // 61: neo.fs.v2.object.SearchRequest.Body.filters:type_name -> neo.fs.v2.object.SearchRequest.Body.Filter
-	44, // 62: neo.fs.v2.object.SearchRequest.Body.Filter.match_type:type_name -> neo.fs.v2.object.MatchType
-	41, // 63: neo.fs.v2.object.SearchResponse.Body.id_list:type_name -> neo.fs.v2.refs.ObjectID
-	39, // 64: neo.fs.v2.object.GetRangeRequest.Body.address:type_name -> neo.fs.v2.refs.Address
-	11, // 65: neo.fs.v2.object.GetRangeRequest.Body.range:type_name -> neo.fs.v2.object.Range
-	40, // 66: neo.fs.v2.object.GetRangeResponse.Body.split_info:type_name -> neo.fs.v2.object.SplitInfo
-	39, // 67: neo.fs.v2.object.GetRangeHashRequest.Body.address:type_name -> neo.fs.v2.refs.Address
-	11, // 68: neo.fs.v2.object.GetRangeHashRequest.Body.ranges:type_name -> neo.fs.v2.object.Range
-	45, // 69: neo.fs.v2.object.GetRangeHashRequest.Body.type:type_name -> neo.fs.v2.refs.ChecksumType
-	45, // 70: neo.fs.v2.object.GetRangeHashResponse.Body.type:type_name -> neo.fs.v2.refs.ChecksumType
-	0,  // 71: neo.fs.v2.object.ObjectService.Get:input_type -> neo.fs.v2.object.GetRequest
-	2,  // 72: neo.fs.v2.object.ObjectService.Put:input_type -> neo.fs.v2.object.PutRequest
-	4,  // 73: neo.fs.v2.object.ObjectService.Delete:input_type -> neo.fs.v2.object.DeleteRequest
-	6,  // 74: neo.fs.v2.object.ObjectService.Head:input_type -> neo.fs.v2.object.HeadRequest
-	9,  // 75: neo.fs.v2.object.ObjectService.Search:input_type -> neo.fs.v2.object.SearchRequest
-	12, // 76: neo.fs.v2.object.ObjectService.GetRange:input_type -> neo.fs.v2.object.GetRangeRequest
-	14, // 77: neo.fs.v2.object.ObjectService.GetRangeHash:input_type -> neo.fs.v2.object.GetRangeHashRequest
-	1,  // 78: neo.fs.v2.object.ObjectService.Get:output_type -> neo.fs.v2.object.GetResponse
-	3,  // 79: neo.fs.v2.object.ObjectService.Put:output_type -> neo.fs.v2.object.PutResponse
-	5,  // 80: neo.fs.v2.object.ObjectService.Delete:output_type -> neo.fs.v2.object.DeleteResponse
-	8,  // 81: neo.fs.v2.object.ObjectService.Head:output_type -> neo.fs.v2.object.HeadResponse
-	10, // 82: neo.fs.v2.object.ObjectService.Search:output_type -> neo.fs.v2.object.SearchResponse
-	13, // 83: neo.fs.v2.object.ObjectService.GetRange:output_type -> neo.fs.v2.object.GetRangeResponse
-	15, // 84: neo.fs.v2.object.ObjectService.GetRangeHash:output_type -> neo.fs.v2.object.GetRangeHashResponse
-	78, // [78:85] is the sub-list for method output_type
-	71, // [71:78] is the sub-list for method input_type
-	71, // [71:71] is the sub-list for extension type_name
-	71, // [71:71] is the sub-list for extension extendee
-	0,  // [0:71] is the sub-list for field type_name
+	39, // 56: neo.fs.v2.object.DeleteResponse.Body.tombstone:type_name -> neo.fs.v2.refs.Address
+	39, // 57: neo.fs.v2.object.HeadRequest.Body.address:type_name -> neo.fs.v2.refs.Address
+	7,  // 58: neo.fs.v2.object.HeadResponse.Body.header:type_name -> neo.fs.v2.object.HeaderWithSignature
+	42, // 59: neo.fs.v2.object.HeadResponse.Body.short_header:type_name -> neo.fs.v2.object.ShortHeader
+	40, // 60: neo.fs.v2.object.HeadResponse.Body.split_info:type_name -> neo.fs.v2.object.SplitInfo
+	43, // 61: neo.fs.v2.object.SearchRequest.Body.container_id:type_name -> neo.fs.v2.refs.ContainerID
+	27, // 62: neo.fs.v2.object.SearchRequest.Body.filters:type_name -> neo.fs.v2.object.SearchRequest.Body.Filter
+	44, // 63: neo.fs.v2.object.SearchRequest.Body.Filter.match_type:type_name -> neo.fs.v2.object.MatchType
+	41, // 64: neo.fs.v2.object.SearchResponse.Body.id_list:type_name -> neo.fs.v2.refs.ObjectID
+	39, // 65: neo.fs.v2.object.GetRangeRequest.Body.address:type_name -> neo.fs.v2.refs.Address
+	11, // 66: neo.fs.v2.object.GetRangeRequest.Body.range:type_name -> neo.fs.v2.object.Range
+	40, // 67: neo.fs.v2.object.GetRangeResponse.Body.split_info:type_name -> neo.fs.v2.object.SplitInfo
+	39, // 68: neo.fs.v2.object.GetRangeHashRequest.Body.address:type_name -> neo.fs.v2.refs.Address
+	11, // 69: neo.fs.v2.object.GetRangeHashRequest.Body.ranges:type_name -> neo.fs.v2.object.Range
+	45, // 70: neo.fs.v2.object.GetRangeHashRequest.Body.type:type_name -> neo.fs.v2.refs.ChecksumType
+	45, // 71: neo.fs.v2.object.GetRangeHashResponse.Body.type:type_name -> neo.fs.v2.refs.ChecksumType
+	0,  // 72: neo.fs.v2.object.ObjectService.Get:input_type -> neo.fs.v2.object.GetRequest
+	2,  // 73: neo.fs.v2.object.ObjectService.Put:input_type -> neo.fs.v2.object.PutRequest
+	4,  // 74: neo.fs.v2.object.ObjectService.Delete:input_type -> neo.fs.v2.object.DeleteRequest
+	6,  // 75: neo.fs.v2.object.ObjectService.Head:input_type -> neo.fs.v2.object.HeadRequest
+	9,  // 76: neo.fs.v2.object.ObjectService.Search:input_type -> neo.fs.v2.object.SearchRequest
+	12, // 77: neo.fs.v2.object.ObjectService.GetRange:input_type -> neo.fs.v2.object.GetRangeRequest
+	14, // 78: neo.fs.v2.object.ObjectService.GetRangeHash:input_type -> neo.fs.v2.object.GetRangeHashRequest
+	1,  // 79: neo.fs.v2.object.ObjectService.Get:output_type -> neo.fs.v2.object.GetResponse
+	3,  // 80: neo.fs.v2.object.ObjectService.Put:output_type -> neo.fs.v2.object.PutResponse
+	5,  // 81: neo.fs.v2.object.ObjectService.Delete:output_type -> neo.fs.v2.object.DeleteResponse
+	8,  // 82: neo.fs.v2.object.ObjectService.Head:output_type -> neo.fs.v2.object.HeadResponse
+	10, // 83: neo.fs.v2.object.ObjectService.Search:output_type -> neo.fs.v2.object.SearchResponse
+	13, // 84: neo.fs.v2.object.ObjectService.GetRange:output_type -> neo.fs.v2.object.GetRangeResponse
+	15, // 85: neo.fs.v2.object.ObjectService.GetRangeHash:output_type -> neo.fs.v2.object.GetRangeHashResponse
+	79, // [79:86] is the sub-list for method output_type
+	72, // [72:79] is the sub-list for method input_type
+	72, // [72:72] is the sub-list for extension type_name
+	72, // [72:72] is the sub-list for extension extendee
+	0,  // [0:72] is the sub-list for field type_name
 }
 
 func init() { file_v2_object_grpc_service_proto_init() }
diff --git a/v2/object/grpc/types.pb.go b/v2/object/grpc/types.pb.go
index 48b2b73..e2de279 100644
--- a/v2/object/grpc/types.pb.go
+++ b/v2/object/grpc/types.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.23.0
-// 	protoc        v3.13.0
+// 	protoc        v3.14.0
 // source: v2/object/grpc/types.proto
 
 package object
@@ -30,6 +30,12 @@ const _ = proto.ProtoPackageIsVersion4
 // Type of the object payload content. Only `REGULAR` type objects can be split,
 // hence `TOMBSTONE` and `STORAGEGROUP` payload is limited by maximal object
 // size.
+//
+// String presentation of object type is PascalCased `ObjectType` enumeration
+// item name:
+// * Regular
+// * Tombstone
+// * StorageGroup
 type ObjectType int32
 
 const (
@@ -138,7 +144,7 @@ type ShortHeader struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Object format version. Effectively the version of API library used to
-	// create particular object
+	// create particular object.
 	Version *grpc.Version `protobuf:"bytes,1,opt,name=version,proto3" json:"version,omitempty"`
 	// Epoch when the object was created
 	CreationEpoch uint64 `protobuf:"varint,2,opt,name=creation_epoch,json=creationEpoch,proto3" json:"creation_epoch,omitempty"`
@@ -234,13 +240,13 @@ type Header struct {
 	// Object creation Epoch
 	CreationEpoch uint64 `protobuf:"varint,4,opt,name=creation_epoch,json=creationEpoch,proto3" json:"creation_epoch,omitempty"`
 	// Size of payload in bytes.
-	// `0xFFFFFFFFFFFFFFFF` means `payload_length` is unknown
+	// `0xFFFFFFFFFFFFFFFF` means `payload_length` is unknown.
 	PayloadLength uint64 `protobuf:"varint,5,opt,name=payload_length,json=payloadLength,proto3" json:"payload_length,omitempty"`
 	// Hash of payload bytes
 	PayloadHash *grpc.Checksum `protobuf:"bytes,6,opt,name=payload_hash,json=payloadHash,proto3" json:"payload_hash,omitempty"`
 	// Type of the object payload content
 	ObjectType ObjectType `protobuf:"varint,7,opt,name=object_type,json=objectType,proto3,enum=neo.fs.v2.object.ObjectType" json:"object_type,omitempty"`
-	// Homomorphic hash of the object payload.
+	// Homomorphic hash of the object payload
 	HomomorphicHash *grpc.Checksum `protobuf:"bytes,8,opt,name=homomorphic_hash,json=homomorphicHash,proto3" json:"homomorphic_hash,omitempty"`
 	// Session token, if it was used during Object creation. Need it to verify
 	// integrity and authenticity out of Request scope.
@@ -374,7 +380,7 @@ type Object struct {
 	Signature *grpc.Signature `protobuf:"bytes,2,opt,name=signature,proto3" json:"signature,omitempty"`
 	// Object metadata headers
 	Header *Header `protobuf:"bytes,3,opt,name=header,proto3" json:"header,omitempty"`
-	// Payload bytes.
+	// Payload bytes
 	Payload []byte `protobuf:"bytes,4,opt,name=payload,proto3" json:"payload,omitempty"`
 }
 
@@ -514,6 +520,8 @@ func (x *SplitInfo) GetLink() *grpc.ObjectID {
 // `Attribute` is a user-defined Key-Value metadata pair attached to the
 // object.
 //
+// Key name must be a valid UTF-8 string. Value can't be empty.
+//
 // There are some "well-known" attributes starting with `__NEOFS__` prefix
 // that affect system behaviour:
 //
@@ -609,9 +617,9 @@ type Header_Split struct {
 	ParentHeader *Header `protobuf:"bytes,4,opt,name=parent_header,json=parentHeader,proto3" json:"parent_header,omitempty"`
 	// List of identifiers of the objects generated by splitting current one.
 	Children []*grpc.ObjectID `protobuf:"bytes,5,rep,name=children,proto3" json:"children,omitempty"`
-	// 16 byte UUID used to identify the split object hierarchy parts. Must be
-	// unique inside container. All objects participating in the split must
-	// have the same `split_id` value.
+	// 16 byte UUIDv4 used to identify the split object hierarchy parts. Must be
+	// unique inside container. All objects participating in the split must have
+	// the same `split_id` value.
 	SplitId []byte `protobuf:"bytes,6,opt,name=split_id,json=splitID,proto3" json:"split_id,omitempty"`
 }
 
diff --git a/v2/refs/grpc/types.pb.go b/v2/refs/grpc/types.pb.go
index c9994bd..b0e18b5 100644
--- a/v2/refs/grpc/types.pb.go
+++ b/v2/refs/grpc/types.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.23.0
-// 	protoc        v3.13.0
+// 	protoc        v3.14.0
 // source: v2/refs/grpc/types.proto
 
 package refs
@@ -78,8 +78,10 @@ func (ChecksumType) EnumDescriptor() ([]byte, []int) {
 	return file_v2_refs_grpc_types_proto_rawDescGZIP(), []int{0}
 }
 
-// Object in NeoFS can be addressed by it's ContainerID and ObjectID. In string
-// format there MUST be a '/' delimeter between them.
+// Objects in NeoFS are addressed by their ContainerID and ObjectID.
+//
+// String presentation of `Address` is the concatenation of string encoded
+// `ContainerID` and `ObjectID` delimited by '/' character.
 type Address struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -138,9 +140,12 @@ func (x *Address) GetObjectId() *ObjectID {
 }
 
 // NeoFS Object unique identifier. Objects are immutable and content-addressed.
-// It means `ObjectID` will change if `header` or `payload` changes. `ObjectID`
-// is calculated as a hash of `header` field, which contains hash of object's
-// payload.
+// It means `ObjectID` will change if `header` or `payload` changes.
+//
+// `ObjectID` is a 32 byte long SHA256 hash of object's `header` field, which,
+// in it's turn, contains hash of object's payload.
+//
+// String presentation is base58 encoded string.
 type ObjectID struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -190,8 +195,12 @@ func (x *ObjectID) GetValue() []byte {
 }
 
 // NeoFS container identifier. Container structures are immutable and
-// content-addressed. `ContainerID` is a 32 byte long SHA256 hash of
-// stable-marshalled container message.
+// content-addressed.
+//
+// `ContainerID` is a 32 byte long SHA256 hash of stable-marshalled container
+// message.
+//
+// String presentation is base58 encoded string.
 type ContainerID struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -240,9 +249,14 @@ func (x *ContainerID) GetValue() []byte {
 	return nil
 }
 
-// OwnerID is a derivative of a user's main public key. The transformation
+// `OwnerID` is a derivative of a user's main public key. The transformation
 // algorithm is the same as for Neo3 wallet addresses. Neo3 wallet address can
 // be directly used as `OwnerID`.
+//
+// `OwnerID` is a 25 bytes sequence starting with Neo version prefix byte
+// followed by 20 bytes of ScrptHash and 4 bytes of checksum.
+//
+// String presentation is Base58 Check Encoded string.
 type OwnerID struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -292,6 +306,9 @@ func (x *OwnerID) GetValue() []byte {
 }
 
 // API version used by a node.
+//
+// String presentation is a Semantic Versioning 2.0.0 compatible version string
+// with 'v' prefix. I.e. `vX.Y`, where `X` - major number, `Y` - minor number.
 type Version struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -408,6 +425,12 @@ func (x *Signature) GetSign() []byte {
 }
 
 // Checksum message.
+// Depending on checksum algorithm type the string presentation may vary:
+//
+// * TZ \
+//   Hex encoded string without `0x` prefix
+// * SHA256 \
+//   Hex encoded string without `0x` prefix
 type Checksum struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
diff --git a/v2/session/grpc/service.pb.go b/v2/session/grpc/service.pb.go
index 712500e..e18b8f3 100644
--- a/v2/session/grpc/service.pb.go
+++ b/v2/session/grpc/service.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.23.0
-// 	protoc        v3.13.0
+// 	protoc        v3.14.0
 // source: v2/session/grpc/service.proto
 
 package session
diff --git a/v2/session/grpc/types.pb.go b/v2/session/grpc/types.pb.go
index 76331a0..fe557fd 100644
--- a/v2/session/grpc/types.pb.go
+++ b/v2/session/grpc/types.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.23.0
-// 	protoc        v3.13.0
+// 	protoc        v3.14.0
 // source: v2/session/grpc/types.proto
 
 package session
diff --git a/v2/storagegroup/grpc/types.pb.go b/v2/storagegroup/grpc/types.pb.go
index 96e9d87..ece2c37 100644
--- a/v2/storagegroup/grpc/types.pb.go
+++ b/v2/storagegroup/grpc/types.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.23.0
-// 	protoc        v3.13.0
+// 	protoc        v3.14.0
 // source: v2/storagegroup/grpc/types.proto
 
 package storagegroup
diff --git a/v2/tombstone/grpc/types.pb.go b/v2/tombstone/grpc/types.pb.go
new file mode 100644
index 0000000..d14e2b9
--- /dev/null
+++ b/v2/tombstone/grpc/types.pb.go
@@ -0,0 +1,188 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.23.0
+// 	protoc        v3.14.0
+// source: v2/tombstone/grpc/types.proto
+
+package tombstone
+
+import (
+	proto "github.com/golang/protobuf/proto"
+	grpc "github.com/nspcc-dev/neofs-api-go/v2/refs/grpc"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// This is a compile-time assertion that a sufficiently up-to-date version
+// of the legacy proto package is being used.
+const _ = proto.ProtoPackageIsVersion4
+
+// Tombstone keeps record of deleted objects for few epochs until they are
+// purged from the NeoFS network.
+type Tombstone struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Last NeoFS epoch number of the tombstone lifetime. It's set by tombstone
+	// creator depending on current NeoFS network settings.
+	ExpirationEpoch uint64 `protobuf:"varint,1,opt,name=expiration_epoch,json=expirationEpoch,proto3" json:"expiration_epoch,omitempty"`
+	// 16 byte UUID used to identify the split object hierarchy parts. Must be
+	// unique inside container. All objects participating in the split must
+	// have the same `split_id` value.
+	SplitId []byte `protobuf:"bytes,2,opt,name=split_id,json=splitID,proto3" json:"split_id,omitempty"`
+	// List of objects to be deleted.
+	Members []*grpc.ObjectID `protobuf:"bytes,3,rep,name=members,proto3" json:"members,omitempty"`
+}
+
+func (x *Tombstone) Reset() {
+	*x = Tombstone{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_v2_tombstone_grpc_types_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Tombstone) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Tombstone) ProtoMessage() {}
+
+func (x *Tombstone) ProtoReflect() protoreflect.Message {
+	mi := &file_v2_tombstone_grpc_types_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Tombstone.ProtoReflect.Descriptor instead.
+func (*Tombstone) Descriptor() ([]byte, []int) {
+	return file_v2_tombstone_grpc_types_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Tombstone) GetExpirationEpoch() uint64 {
+	if x != nil {
+		return x.ExpirationEpoch
+	}
+	return 0
+}
+
+func (x *Tombstone) GetSplitId() []byte {
+	if x != nil {
+		return x.SplitId
+	}
+	return nil
+}
+
+func (x *Tombstone) GetMembers() []*grpc.ObjectID {
+	if x != nil {
+		return x.Members
+	}
+	return nil
+}
+
+var File_v2_tombstone_grpc_types_proto protoreflect.FileDescriptor
+
+var file_v2_tombstone_grpc_types_proto_rawDesc = []byte{
+	0x0a, 0x1d, 0x76, 0x32, 0x2f, 0x74, 0x6f, 0x6d, 0x62, 0x73, 0x74, 0x6f, 0x6e, 0x65, 0x2f, 0x67,
+	0x72, 0x70, 0x63, 0x2f, 0x74, 0x79, 0x70, 0x65, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12,
+	0x13, 0x6e, 0x65, 0x6f, 0x2e, 0x66, 0x73, 0x2e, 0x76, 0x32, 0x2e, 0x74, 0x6f, 0x6d, 0x62, 0x73,
+	0x74, 0x6f, 0x6e, 0x65, 0x1a, 0x18, 0x76, 0x32, 0x2f, 0x72, 0x65, 0x66, 0x73, 0x2f, 0x67, 0x72,
+	0x70, 0x63, 0x2f, 0x74, 0x79, 0x70, 0x65, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0x85,
+	0x01, 0x0a, 0x09, 0x54, 0x6f, 0x6d, 0x62, 0x73, 0x74, 0x6f, 0x6e, 0x65, 0x12, 0x29, 0x0a, 0x10,
+	0x65, 0x78, 0x70, 0x69, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x5f, 0x65, 0x70, 0x6f, 0x63, 0x68,
+	0x18, 0x01, 0x20, 0x01, 0x28, 0x04, 0x52, 0x0f, 0x65, 0x78, 0x70, 0x69, 0x72, 0x61, 0x74, 0x69,
+	0x6f, 0x6e, 0x45, 0x70, 0x6f, 0x63, 0x68, 0x12, 0x19, 0x0a, 0x08, 0x73, 0x70, 0x6c, 0x69, 0x74,
+	0x5f, 0x69, 0x64, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x07, 0x73, 0x70, 0x6c, 0x69, 0x74,
+	0x49, 0x44, 0x12, 0x32, 0x0a, 0x07, 0x6d, 0x65, 0x6d, 0x62, 0x65, 0x72, 0x73, 0x18, 0x03, 0x20,
+	0x03, 0x28, 0x0b, 0x32, 0x18, 0x2e, 0x6e, 0x65, 0x6f, 0x2e, 0x66, 0x73, 0x2e, 0x76, 0x32, 0x2e,
+	0x72, 0x65, 0x66, 0x73, 0x2e, 0x4f, 0x62, 0x6a, 0x65, 0x63, 0x74, 0x49, 0x44, 0x52, 0x07, 0x6d,
+	0x65, 0x6d, 0x62, 0x65, 0x72, 0x73, 0x42, 0x58, 0x5a, 0x3d, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62,
+	0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x6e, 0x73, 0x70, 0x63, 0x63, 0x2d, 0x64, 0x65, 0x76, 0x2f, 0x6e,
+	0x65, 0x6f, 0x66, 0x73, 0x2d, 0x61, 0x70, 0x69, 0x2d, 0x67, 0x6f, 0x2f, 0x76, 0x32, 0x2f, 0x74,
+	0x6f, 0x6d, 0x62, 0x73, 0x74, 0x6f, 0x6e, 0x65, 0x2f, 0x67, 0x72, 0x70, 0x63, 0x3b, 0x74, 0x6f,
+	0x6d, 0x62, 0x73, 0x74, 0x6f, 0x6e, 0x65, 0xaa, 0x02, 0x16, 0x4e, 0x65, 0x6f, 0x46, 0x53, 0x2e,
+	0x41, 0x50, 0x49, 0x2e, 0x76, 0x32, 0x2e, 0x54, 0x6f, 0x6d, 0x62, 0x73, 0x74, 0x6f, 0x6e, 0x65,
+	0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_v2_tombstone_grpc_types_proto_rawDescOnce sync.Once
+	file_v2_tombstone_grpc_types_proto_rawDescData = file_v2_tombstone_grpc_types_proto_rawDesc
+)
+
+func file_v2_tombstone_grpc_types_proto_rawDescGZIP() []byte {
+	file_v2_tombstone_grpc_types_proto_rawDescOnce.Do(func() {
+		file_v2_tombstone_grpc_types_proto_rawDescData = protoimpl.X.CompressGZIP(file_v2_tombstone_grpc_types_proto_rawDescData)
+	})
+	return file_v2_tombstone_grpc_types_proto_rawDescData
+}
+
+var file_v2_tombstone_grpc_types_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_v2_tombstone_grpc_types_proto_goTypes = []interface{}{
+	(*Tombstone)(nil),     // 0: neo.fs.v2.tombstone.Tombstone
+	(*grpc.ObjectID)(nil), // 1: neo.fs.v2.refs.ObjectID
+}
+var file_v2_tombstone_grpc_types_proto_depIdxs = []int32{
+	1, // 0: neo.fs.v2.tombstone.Tombstone.members:type_name -> neo.fs.v2.refs.ObjectID
+	1, // [1:1] is the sub-list for method output_type
+	1, // [1:1] is the sub-list for method input_type
+	1, // [1:1] is the sub-list for extension type_name
+	1, // [1:1] is the sub-list for extension extendee
+	0, // [0:1] is the sub-list for field type_name
+}
+
+func init() { file_v2_tombstone_grpc_types_proto_init() }
+func file_v2_tombstone_grpc_types_proto_init() {
+	if File_v2_tombstone_grpc_types_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_v2_tombstone_grpc_types_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Tombstone); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_v2_tombstone_grpc_types_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_v2_tombstone_grpc_types_proto_goTypes,
+		DependencyIndexes: file_v2_tombstone_grpc_types_proto_depIdxs,
+		MessageInfos:      file_v2_tombstone_grpc_types_proto_msgTypes,
+	}.Build()
+	File_v2_tombstone_grpc_types_proto = out.File
+	file_v2_tombstone_grpc_types_proto_rawDesc = nil
+	file_v2_tombstone_grpc_types_proto_goTypes = nil
+	file_v2_tombstone_grpc_types_proto_depIdxs = nil
+}