diff --git a/container/convert.go b/container/convert.go
index 89e0153..5e49bea 100644
--- a/container/convert.go
+++ b/container/convert.go
@@ -152,6 +152,18 @@ func (c *Container) FromGRPCMessage(m grpc.Message) error {
 	return nil
 }
 
+func toSignatureRFC6979(s *refs.Signature) *refsGRPC.SignatureRFC6979 {
+	var res *refsGRPC.SignatureRFC6979
+
+	if s != nil {
+		res = new(refsGRPC.SignatureRFC6979)
+		res.SetKey(s.GetKey())
+		res.SetSign(s.GetSign())
+	}
+
+	return res
+}
+
 func (r *PutRequestBody) ToGRPCMessage() grpc.Message {
 	var m *container.PutRequest_Body
 
@@ -159,7 +171,7 @@ func (r *PutRequestBody) ToGRPCMessage() grpc.Message {
 		m = new(container.PutRequest_Body)
 
 		m.SetContainer(r.cnr.ToGRPCMessage().(*container.Container))
-		m.SetSignature(r.sig.ToGRPCMessage().(*refsGRPC.Signature))
+		m.SetSignature(toSignatureRFC6979(r.sig))
 	}
 
 	return m
@@ -195,7 +207,8 @@ func (r *PutRequestBody) FromGRPCMessage(m grpc.Message) error {
 			r.sig = new(refs.Signature)
 		}
 
-		err = r.sig.FromGRPCMessage(sig)
+		r.sig.SetKey(sig.GetKey())
+		r.sig.SetSign(sig.GetSign())
 	}
 
 	return err
@@ -391,7 +404,7 @@ func (r *GetResponseBody) ToGRPCMessage() grpc.Message {
 
 		m.SetContainer(r.cnr.ToGRPCMessage().(*container.Container))
 		m.SetSessionToken(r.token.ToGRPCMessage().(*sessionGRPC.SessionToken))
-		m.SetSignature(r.sig.ToGRPCMessage().(*refsGRPC.Signature))
+		m.SetSignature(toSignatureRFC6979(r.sig))
 	}
 
 	return m
@@ -424,7 +437,8 @@ func (r *GetResponseBody) FromGRPCMessage(m grpc.Message) error {
 			r.sig = new(refs.Signature)
 		}
 
-		err = r.sig.FromGRPCMessage(sig)
+		r.sig.SetKey(sig.GetKey())
+		r.sig.SetSign(sig.GetSign())
 	}
 
 	token := v.GetSessionToken()
@@ -486,7 +500,7 @@ func (r *DeleteRequestBody) ToGRPCMessage() grpc.Message {
 		m = new(container.DeleteRequest_Body)
 
 		m.SetContainerId(r.cid.ToGRPCMessage().(*refsGRPC.ContainerID))
-		m.SetSignature(r.sig.ToGRPCMessage().(*refsGRPC.Signature))
+		m.SetSignature(toSignatureRFC6979(r.sig))
 	}
 
 	return m
@@ -522,7 +536,8 @@ func (r *DeleteRequestBody) FromGRPCMessage(m grpc.Message) error {
 			r.sig = new(refs.Signature)
 		}
 
-		err = r.sig.FromGRPCMessage(sig)
+		r.sig.SetKey(sig.GetKey())
+		r.sig.SetSign(sig.GetSign())
 	}
 
 	return err
@@ -765,7 +780,7 @@ func (r *SetExtendedACLRequestBody) ToGRPCMessage() grpc.Message {
 		m = new(container.SetExtendedACLRequest_Body)
 
 		m.SetEacl(r.eacl.ToGRPCMessage().(*aclGRPC.EACLTable))
-		m.SetSignature(r.sig.ToGRPCMessage().(*refsGRPC.Signature))
+		m.SetSignature(toSignatureRFC6979(r.sig))
 	}
 
 	return m
@@ -801,7 +816,8 @@ func (r *SetExtendedACLRequestBody) FromGRPCMessage(m grpc.Message) error {
 			r.sig = new(refs.Signature)
 		}
 
-		err = r.sig.FromGRPCMessage(sig)
+		r.sig.SetKey(sig.GetKey())
+		r.sig.SetSign(sig.GetSign())
 	}
 
 	return err
@@ -981,7 +997,7 @@ func (r *GetExtendedACLResponseBody) ToGRPCMessage() grpc.Message {
 		m = new(container.GetExtendedACLResponse_Body)
 
 		m.SetEacl(r.eacl.ToGRPCMessage().(*aclGRPC.EACLTable))
-		m.SetSignature(r.sig.ToGRPCMessage().(*refsGRPC.Signature))
+		m.SetSignature(toSignatureRFC6979(r.sig))
 		m.SetSessionToken(r.token.ToGRPCMessage().(*sessionGRPC.SessionToken))
 	}
 
@@ -1018,7 +1034,8 @@ func (r *GetExtendedACLResponseBody) FromGRPCMessage(m grpc.Message) error {
 			r.sig = new(refs.Signature)
 		}
 
-		err = r.sig.FromGRPCMessage(sig)
+		r.sig.SetKey(sig.GetKey())
+		r.sig.SetSign(sig.GetSign())
 	}
 
 	token := v.GetSessionToken()
diff --git a/container/grpc/service.go b/container/grpc/service.go
index 6aa854b..09743dc 100644
--- a/container/grpc/service.go
+++ b/container/grpc/service.go
@@ -14,7 +14,7 @@ func (m *PutRequest_Body) SetContainer(v *Container) {
 }
 
 // SetSignature sets signature of the container structure.
-func (m *PutRequest_Body) SetSignature(v *refs.Signature) {
+func (m *PutRequest_Body) SetSignature(v *refs.SignatureRFC6979) {
 	if m != nil {
 		m.Signature = v
 	}
@@ -77,7 +77,7 @@ func (m *DeleteRequest_Body) SetContainerId(v *refs.ContainerID) {
 }
 
 // SetSignature sets signature of the container identifier.
-func (m *DeleteRequest_Body) SetSignature(v *refs.Signature) {
+func (m *DeleteRequest_Body) SetSignature(v *refs.SignatureRFC6979) {
 	if m != nil {
 		m.Signature = v
 	}
@@ -166,8 +166,8 @@ func (m *GetResponse_Body) SetSessionToken(v *session.SessionToken) {
 	}
 }
 
-// SetSignature sets signature of the requested container.
-func (m *GetResponse_Body) SetSignature(v *refs.Signature) {
+// SetSignature sets signature of the container structure.
+func (m *GetResponse_Body) SetSignature(v *refs.SignatureRFC6979) {
 	if m != nil {
 		m.Signature = v
 	}
@@ -257,8 +257,8 @@ func (m *SetExtendedACLRequest_Body) SetEacl(v *acl.EACLTable) {
 	}
 }
 
-// SetSignature sets signature of the eACL table.
-func (m *SetExtendedACLRequest_Body) SetSignature(v *refs.Signature) {
+// SetSignature sets signature of the eACL table structure.
+func (m *SetExtendedACLRequest_Body) SetSignature(v *refs.SignatureRFC6979) {
 	if m != nil {
 		m.Signature = v
 	}
@@ -341,8 +341,8 @@ func (m *GetExtendedACLResponse_Body) SetEacl(v *acl.EACLTable) {
 	}
 }
 
-// SetSignature sets signature of the eACL table.
-func (m *GetExtendedACLResponse_Body) SetSignature(v *refs.Signature) {
+// SetSignature sets signature of the eACL table structure.
+func (m *GetExtendedACLResponse_Body) SetSignature(v *refs.SignatureRFC6979) {
 	if m != nil {
 		m.Signature = v
 	}
diff --git a/container/grpc/service.pb.go b/container/grpc/service.pb.go
index d7fa78e..dd91394 100644
--- a/container/grpc/service.pb.go
+++ b/container/grpc/service.pb.go
@@ -1017,8 +1017,7 @@ type PutRequest_Body struct {
 	// Container structure to register in NeoFS
 	Container *Container `protobuf:"bytes,1,opt,name=container,proto3" json:"container,omitempty"`
 	// Signature of a stable-marshalled container according to RFC-6979.
-	// Signature scheme must be either UNSPECIFIED or ECDSA_RFC6979_SHA256.
-	Signature *grpc1.Signature `protobuf:"bytes,2,opt,name=signature,proto3" json:"signature,omitempty"`
+	Signature *grpc1.SignatureRFC6979 `protobuf:"bytes,2,opt,name=signature,proto3" json:"signature,omitempty"`
 }
 
 func (x *PutRequest_Body) Reset() {
@@ -1060,7 +1059,7 @@ func (x *PutRequest_Body) GetContainer() *Container {
 	return nil
 }
 
-func (x *PutRequest_Body) GetSignature() *grpc1.Signature {
+func (x *PutRequest_Body) GetSignature() *grpc1.SignatureRFC6979 {
 	if x != nil {
 		return x.Signature
 	}
@@ -1130,8 +1129,7 @@ type DeleteRequest_Body struct {
 	// Identifier of the container to delete from NeoFS
 	ContainerId *grpc1.ContainerID `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
 	// `ContainerID` signed with the container owner's key according to RFC-6979.
-	// Signature scheme must be either UNSPECIFIED or ECDSA_RFC6979_SHA256.
-	Signature *grpc1.Signature `protobuf:"bytes,2,opt,name=signature,proto3" json:"signature,omitempty"`
+	Signature *grpc1.SignatureRFC6979 `protobuf:"bytes,2,opt,name=signature,proto3" json:"signature,omitempty"`
 }
 
 func (x *DeleteRequest_Body) Reset() {
@@ -1173,7 +1171,7 @@ func (x *DeleteRequest_Body) GetContainerId() *grpc1.ContainerID {
 	return nil
 }
 
-func (x *DeleteRequest_Body) GetSignature() *grpc1.Signature {
+func (x *DeleteRequest_Body) GetSignature() *grpc1.SignatureRFC6979 {
 	if x != nil {
 		return x.Signature
 	}
@@ -1279,8 +1277,7 @@ type GetResponse_Body struct {
 	// Requested container structure
 	Container *Container `protobuf:"bytes,1,opt,name=container,proto3" json:"container,omitempty"`
 	// Signature of a stable-marshalled container according to RFC-6979.
-	// Signature scheme must be either UNSPECIFIED or ECDSA_RFC6979_SHA256.
-	Signature *grpc1.Signature `protobuf:"bytes,2,opt,name=signature,proto3" json:"signature,omitempty"`
+	Signature *grpc1.SignatureRFC6979 `protobuf:"bytes,2,opt,name=signature,proto3" json:"signature,omitempty"`
 	// Session token if the container was created within a session
 	SessionToken *grpc.SessionToken `protobuf:"bytes,3,opt,name=session_token,json=sessionToken,proto3" json:"session_token,omitempty"`
 }
@@ -1324,7 +1321,7 @@ func (x *GetResponse_Body) GetContainer() *Container {
 	return nil
 }
 
-func (x *GetResponse_Body) GetSignature() *grpc1.Signature {
+func (x *GetResponse_Body) GetSignature() *grpc1.SignatureRFC6979 {
 	if x != nil {
 		return x.Signature
 	}
@@ -1446,8 +1443,7 @@ type SetExtendedACLRequest_Body struct {
 	// Extended ACL table to set for container
 	Eacl *grpc2.EACLTable `protobuf:"bytes,1,opt,name=eacl,proto3" json:"eacl,omitempty"`
 	// Signature of stable-marshalled Extended ACL table according to RFC-6979.
-	// Signature scheme must be either UNSPECIFIED or ECDSA_RFC6979_SHA256.
-	Signature *grpc1.Signature `protobuf:"bytes,2,opt,name=signature,proto3" json:"signature,omitempty"`
+	Signature *grpc1.SignatureRFC6979 `protobuf:"bytes,2,opt,name=signature,proto3" json:"signature,omitempty"`
 }
 
 func (x *SetExtendedACLRequest_Body) Reset() {
@@ -1489,7 +1485,7 @@ func (x *SetExtendedACLRequest_Body) GetEacl() *grpc2.EACLTable {
 	return nil
 }
 
-func (x *SetExtendedACLRequest_Body) GetSignature() *grpc1.Signature {
+func (x *SetExtendedACLRequest_Body) GetSignature() *grpc1.SignatureRFC6979 {
 	if x != nil {
 		return x.Signature
 	}
@@ -1597,8 +1593,7 @@ type GetExtendedACLResponse_Body struct {
 	// Extended ACL requested, if available
 	Eacl *grpc2.EACLTable `protobuf:"bytes,1,opt,name=eacl,proto3" json:"eacl,omitempty"`
 	// Signature of stable-marshalled Extended ACL according to RFC-6979.
-	// Signature scheme must be either UNSPECIFIED or ECDSA_RFC6979_SHA256.
-	Signature *grpc1.Signature `protobuf:"bytes,2,opt,name=signature,proto3" json:"signature,omitempty"`
+	Signature *grpc1.SignatureRFC6979 `protobuf:"bytes,2,opt,name=signature,proto3" json:"signature,omitempty"`
 	// Session token if Extended ACL was set within a session
 	SessionToken *grpc.SessionToken `protobuf:"bytes,3,opt,name=session_token,json=sessionToken,proto3" json:"session_token,omitempty"`
 }
@@ -1642,7 +1637,7 @@ func (x *GetExtendedACLResponse_Body) GetEacl() *grpc2.EACLTable {
 	return nil
 }
 
-func (x *GetExtendedACLResponse_Body) GetSignature() *grpc1.Signature {
+func (x *GetExtendedACLResponse_Body) GetSignature() *grpc1.SignatureRFC6979 {
 	if x != nil {
 		return x.Signature
 	}
@@ -1826,7 +1821,7 @@ var file_container_grpc_service_proto_rawDesc = []byte{
 	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x1a, 0x15, 0x72, 0x65, 0x66, 0x73, 0x2f, 0x67, 0x72, 0x70, 0x63,
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@@ -1840,56 +1835,57 @@ var file_container_grpc_service_proto_rawDesc = []byte{
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+	0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -2220,7 +2218,7 @@ var file_container_grpc_service_proto_goTypes = []interface{}{
 	(*grpc.ResponseMetaHeader)(nil),                    // 31: neo.fs.v2.session.ResponseMetaHeader
 	(*grpc.ResponseVerificationHeader)(nil),            // 32: neo.fs.v2.session.ResponseVerificationHeader
 	(*Container)(nil),                                  // 33: neo.fs.v2.container.Container
-	(*grpc1.Signature)(nil),                            // 34: neo.fs.v2.refs.Signature
+	(*grpc1.SignatureRFC6979)(nil),                     // 34: neo.fs.v2.refs.SignatureRFC6979
 	(*grpc1.ContainerID)(nil),                          // 35: neo.fs.v2.refs.ContainerID
 	(*grpc.SessionToken)(nil),                          // 36: neo.fs.v2.session.SessionToken
 	(*grpc1.OwnerID)(nil),                              // 37: neo.fs.v2.refs.OwnerID
@@ -2270,21 +2268,21 @@ var file_container_grpc_service_proto_depIdxs = []int32{
 	31, // 40: neo.fs.v2.container.AnnounceUsedSpaceResponse.meta_header:type_name -> neo.fs.v2.session.ResponseMetaHeader
 	32, // 41: neo.fs.v2.container.AnnounceUsedSpaceResponse.verify_header:type_name -> neo.fs.v2.session.ResponseVerificationHeader
 	33, // 42: neo.fs.v2.container.PutRequest.Body.container:type_name -> neo.fs.v2.container.Container
-	34, // 43: neo.fs.v2.container.PutRequest.Body.signature:type_name -> neo.fs.v2.refs.Signature
+	34, // 43: neo.fs.v2.container.PutRequest.Body.signature:type_name -> neo.fs.v2.refs.SignatureRFC6979
 	35, // 44: neo.fs.v2.container.PutResponse.Body.container_id:type_name -> neo.fs.v2.refs.ContainerID
 	35, // 45: neo.fs.v2.container.DeleteRequest.Body.container_id:type_name -> neo.fs.v2.refs.ContainerID
-	34, // 46: neo.fs.v2.container.DeleteRequest.Body.signature:type_name -> neo.fs.v2.refs.Signature
+	34, // 46: neo.fs.v2.container.DeleteRequest.Body.signature:type_name -> neo.fs.v2.refs.SignatureRFC6979
 	35, // 47: neo.fs.v2.container.GetRequest.Body.container_id:type_name -> neo.fs.v2.refs.ContainerID
 	33, // 48: neo.fs.v2.container.GetResponse.Body.container:type_name -> neo.fs.v2.container.Container
-	34, // 49: neo.fs.v2.container.GetResponse.Body.signature:type_name -> neo.fs.v2.refs.Signature
+	34, // 49: neo.fs.v2.container.GetResponse.Body.signature:type_name -> neo.fs.v2.refs.SignatureRFC6979
 	36, // 50: neo.fs.v2.container.GetResponse.Body.session_token:type_name -> neo.fs.v2.session.SessionToken
 	37, // 51: neo.fs.v2.container.ListRequest.Body.owner_id:type_name -> neo.fs.v2.refs.OwnerID
 	35, // 52: neo.fs.v2.container.ListResponse.Body.container_ids:type_name -> neo.fs.v2.refs.ContainerID
 	38, // 53: neo.fs.v2.container.SetExtendedACLRequest.Body.eacl:type_name -> neo.fs.v2.acl.EACLTable
-	34, // 54: neo.fs.v2.container.SetExtendedACLRequest.Body.signature:type_name -> neo.fs.v2.refs.Signature
+	34, // 54: neo.fs.v2.container.SetExtendedACLRequest.Body.signature:type_name -> neo.fs.v2.refs.SignatureRFC6979
 	35, // 55: neo.fs.v2.container.GetExtendedACLRequest.Body.container_id:type_name -> neo.fs.v2.refs.ContainerID
 	38, // 56: neo.fs.v2.container.GetExtendedACLResponse.Body.eacl:type_name -> neo.fs.v2.acl.EACLTable
-	34, // 57: neo.fs.v2.container.GetExtendedACLResponse.Body.signature:type_name -> neo.fs.v2.refs.Signature
+	34, // 57: neo.fs.v2.container.GetExtendedACLResponse.Body.signature:type_name -> neo.fs.v2.refs.SignatureRFC6979
 	36, // 58: neo.fs.v2.container.GetExtendedACLResponse.Body.session_token:type_name -> neo.fs.v2.session.SessionToken
 	27, // 59: neo.fs.v2.container.AnnounceUsedSpaceRequest.Body.announcements:type_name -> neo.fs.v2.container.AnnounceUsedSpaceRequest.Body.Announcement
 	35, // 60: neo.fs.v2.container.AnnounceUsedSpaceRequest.Body.Announcement.container_id:type_name -> neo.fs.v2.refs.ContainerID
diff --git a/container/types.go b/container/types.go
index ea7fd9c..4da1723 100644
--- a/container/types.go
+++ b/container/types.go
@@ -316,6 +316,8 @@ func (r *PutRequestBody) GetSignature() *refs.Signature {
 
 func (r *PutRequestBody) SetSignature(v *refs.Signature) {
 	if r != nil {
+		// TODO: (neofs-api-go#381) avoid this hack (e.g. create refs.SignatureRFC6979 type)
+		v.SetScheme(0)
 		r.sig = v
 	}
 }
@@ -434,6 +436,8 @@ func (r *GetResponseBody) GetSignature() *refs.Signature {
 // SetSignature sets signature of the requested container.
 func (r *GetResponseBody) SetSignature(v *refs.Signature) {
 	if r != nil {
+		// TODO: (neofs-api-go#381) avoid this hack (e.g. create refs.SignatureRFC6979 type)
+		v.SetScheme(0)
 		r.sig = v
 	}
 }
@@ -476,6 +480,8 @@ func (r *DeleteRequestBody) GetSignature() *refs.Signature {
 
 func (r *DeleteRequestBody) SetSignature(v *refs.Signature) {
 	if r != nil {
+		// TODO: (neofs-api-go#381) avoid this hack (e.g. create refs.SignatureRFC6979 type)
+		v.SetScheme(0)
 		r.sig = v
 	}
 }
@@ -588,6 +594,8 @@ func (r *SetExtendedACLRequestBody) GetSignature() *refs.Signature {
 
 func (r *SetExtendedACLRequestBody) SetSignature(v *refs.Signature) {
 	if r != nil {
+		// TODO: (neofs-api-go#381) avoid this hack (e.g. create refs.SignatureRFC6979 type)
+		v.SetScheme(0)
 		r.sig = v
 	}
 }
@@ -672,6 +680,8 @@ func (r *GetExtendedACLResponseBody) GetSignature() *refs.Signature {
 
 func (r *GetExtendedACLResponseBody) SetSignature(v *refs.Signature) {
 	if r != nil {
+		// TODO: (neofs-api-go#381) avoid this hack (e.g. create refs.SignatureRFC6979 type)
+		v.SetScheme(0)
 		r.sig = v
 	}
 }
diff --git a/refs/grpc/types.go b/refs/grpc/types.go
index b1c48c1..e191656 100644
--- a/refs/grpc/types.go
+++ b/refs/grpc/types.go
@@ -84,6 +84,20 @@ func (x *Signature) SetScheme(s SignatureScheme) {
 	}
 }
 
+// SetKey sets public key in a binary format.
+func (x *SignatureRFC6979) SetKey(v []byte) {
+	if x != nil {
+		x.Key = v
+	}
+}
+
+// SetSign sets signature.
+func (x *SignatureRFC6979) SetSign(v []byte) {
+	if x != nil {
+		x.Sign = v
+	}
+}
+
 // FromString parses SignatureScheme from a string representation,
 // It is a reverse action to String().
 //
diff --git a/refs/grpc/types.pb.go b/refs/grpc/types.pb.go
index 7df2f05..96f6285 100644
--- a/refs/grpc/types.pb.go
+++ b/refs/grpc/types.pb.go
@@ -24,25 +24,21 @@ const (
 type SignatureScheme int32
 
 const (
-	// Unknown. The default interpretation depends on a particular structure type.
-	SignatureScheme_UNSPECIFIED SignatureScheme = 0
-	// ECDSA with SHA-512 hashing (FIPS 186-3).
-	SignatureScheme_ECDSA_SHA512 SignatureScheme = 1
+	// ECDSA with SHA-512 hashing (FIPS 186-3)
+	SignatureScheme_ECDSA_SHA512 SignatureScheme = 0
 	// Deterministic ECDSA with SHA-256 hashing (RFC 6979)
-	SignatureScheme_ECDSA_RFC6979_SHA256 SignatureScheme = 2
+	SignatureScheme_ECDSA_RFC6979_SHA256 SignatureScheme = 1
 )
 
 // Enum value maps for SignatureScheme.
 var (
 	SignatureScheme_name = map[int32]string{
-		0: "UNSPECIFIED",
-		1: "ECDSA_SHA512",
-		2: "ECDSA_RFC6979_SHA256",
+		0: "ECDSA_SHA512",
+		1: "ECDSA_RFC6979_SHA256",
 	}
 	SignatureScheme_value = map[string]int32{
-		"UNSPECIFIED":          0,
-		"ECDSA_SHA512":         1,
-		"ECDSA_RFC6979_SHA256": 2,
+		"ECDSA_SHA512":         0,
+		"ECDSA_RFC6979_SHA256": 1,
 	}
 )
 
@@ -501,7 +497,7 @@ type Signature struct {
 	Key []byte `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
 	// Signature
 	Sign []byte `protobuf:"bytes,2,opt,name=sign,json=signature,proto3" json:"sign,omitempty"`
-	// Scheme contains digital signature scheme identifier.
+	// Scheme contains digital signature scheme identifier
 	Scheme SignatureScheme `protobuf:"varint,3,opt,name=scheme,proto3,enum=neo.fs.v2.refs.SignatureScheme" json:"scheme,omitempty"`
 }
 
@@ -555,7 +551,65 @@ func (x *Signature) GetScheme() SignatureScheme {
 	if x != nil {
 		return x.Scheme
 	}
-	return SignatureScheme_UNSPECIFIED
+	return SignatureScheme_ECDSA_SHA512
+}
+
+// RFC 6979 signature.
+type SignatureRFC6979 struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Public key used for signing
+	Key []byte `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
+	// Deterministic ECDSA with SHA-256 hashing
+	Sign []byte `protobuf:"bytes,2,opt,name=sign,json=signature,proto3" json:"sign,omitempty"`
+}
+
+func (x *SignatureRFC6979) Reset() {
+	*x = SignatureRFC6979{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_refs_grpc_types_proto_msgTypes[7]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SignatureRFC6979) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SignatureRFC6979) ProtoMessage() {}
+
+func (x *SignatureRFC6979) ProtoReflect() protoreflect.Message {
+	mi := &file_refs_grpc_types_proto_msgTypes[7]
+	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 SignatureRFC6979.ProtoReflect.Descriptor instead.
+func (*SignatureRFC6979) Descriptor() ([]byte, []int) {
+	return file_refs_grpc_types_proto_rawDescGZIP(), []int{7}
+}
+
+func (x *SignatureRFC6979) GetKey() []byte {
+	if x != nil {
+		return x.Key
+	}
+	return nil
+}
+
+func (x *SignatureRFC6979) GetSign() []byte {
+	if x != nil {
+		return x.Sign
+	}
+	return nil
 }
 
 // Checksum message.
@@ -579,7 +633,7 @@ type Checksum struct {
 func (x *Checksum) Reset() {
 	*x = Checksum{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_refs_grpc_types_proto_msgTypes[7]
+		mi := &file_refs_grpc_types_proto_msgTypes[8]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -592,7 +646,7 @@ func (x *Checksum) String() string {
 func (*Checksum) ProtoMessage() {}
 
 func (x *Checksum) ProtoReflect() protoreflect.Message {
-	mi := &file_refs_grpc_types_proto_msgTypes[7]
+	mi := &file_refs_grpc_types_proto_msgTypes[8]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -605,7 +659,7 @@ func (x *Checksum) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Checksum.ProtoReflect.Descriptor instead.
 func (*Checksum) Descriptor() ([]byte, []int) {
-	return file_refs_grpc_types_proto_rawDescGZIP(), []int{7}
+	return file_refs_grpc_types_proto_rawDescGZIP(), []int{8}
 }
 
 func (x *Checksum) GetType() ChecksumType {
@@ -654,27 +708,30 @@ var file_refs_grpc_types_proto_rawDesc = []byte{
 	0x75, 0x72, 0x65, 0x12, 0x37, 0x0a, 0x06, 0x73, 0x63, 0x68, 0x65, 0x6d, 0x65, 0x18, 0x03, 0x20,
 	0x01, 0x28, 0x0e, 0x32, 0x1f, 0x2e, 0x6e, 0x65, 0x6f, 0x2e, 0x66, 0x73, 0x2e, 0x76, 0x32, 0x2e,
 	0x72, 0x65, 0x66, 0x73, 0x2e, 0x53, 0x69, 0x67, 0x6e, 0x61, 0x74, 0x75, 0x72, 0x65, 0x53, 0x63,
-	0x68, 0x65, 0x6d, 0x65, 0x52, 0x06, 0x73, 0x63, 0x68, 0x65, 0x6d, 0x65, 0x22, 0x4e, 0x0a, 0x08,
-	0x43, 0x68, 0x65, 0x63, 0x6b, 0x73, 0x75, 0x6d, 0x12, 0x30, 0x0a, 0x04, 0x74, 0x79, 0x70, 0x65,
-	0x18, 0x01, 0x20, 0x01, 0x28, 0x0e, 0x32, 0x1c, 0x2e, 0x6e, 0x65, 0x6f, 0x2e, 0x66, 0x73, 0x2e,
-	0x76, 0x32, 0x2e, 0x72, 0x65, 0x66, 0x73, 0x2e, 0x43, 0x68, 0x65, 0x63, 0x6b, 0x73, 0x75, 0x6d,
-	0x54, 0x79, 0x70, 0x65, 0x52, 0x04, 0x74, 0x79, 0x70, 0x65, 0x12, 0x10, 0x0a, 0x03, 0x73, 0x75,
-	0x6d, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x03, 0x73, 0x75, 0x6d, 0x2a, 0x4e, 0x0a, 0x0f,
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-	0x0f, 0x0a, 0x0b, 0x55, 0x4e, 0x53, 0x50, 0x45, 0x43, 0x49, 0x46, 0x49, 0x45, 0x44, 0x10, 0x00,
-	0x12, 0x10, 0x0a, 0x0c, 0x45, 0x43, 0x44, 0x53, 0x41, 0x5f, 0x53, 0x48, 0x41, 0x35, 0x31, 0x32,
-	0x10, 0x01, 0x12, 0x18, 0x0a, 0x14, 0x45, 0x43, 0x44, 0x53, 0x41, 0x5f, 0x52, 0x46, 0x43, 0x36,
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-	0x43, 0x48, 0x45, 0x43, 0x4b, 0x53, 0x55, 0x4d, 0x5f, 0x54, 0x59, 0x50, 0x45, 0x5f, 0x55, 0x4e,
-	0x53, 0x50, 0x45, 0x43, 0x49, 0x46, 0x49, 0x45, 0x44, 0x10, 0x00, 0x12, 0x06, 0x0a, 0x02, 0x54,
-	0x5a, 0x10, 0x01, 0x12, 0x0a, 0x0a, 0x06, 0x53, 0x48, 0x41, 0x32, 0x35, 0x36, 0x10, 0x02, 0x42,
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-	0x70, 0x63, 0x63, 0x2d, 0x64, 0x65, 0x76, 0x2f, 0x6e, 0x65, 0x6f, 0x66, 0x73, 0x2d, 0x61, 0x70,
-	0x69, 0x2d, 0x67, 0x6f, 0x2f, 0x76, 0x32, 0x2f, 0x72, 0x65, 0x66, 0x73, 0x2f, 0x67, 0x72, 0x70,
-	0x63, 0x3b, 0x72, 0x65, 0x66, 0x73, 0xaa, 0x02, 0x18, 0x4e, 0x65, 0x6f, 0x2e, 0x46, 0x69, 0x6c,
-	0x65, 0x53, 0x74, 0x6f, 0x72, 0x61, 0x67, 0x65, 0x2e, 0x41, 0x50, 0x49, 0x2e, 0x52, 0x65, 0x66,
-	0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x68, 0x65, 0x6d, 0x65, 0x52, 0x06, 0x73, 0x63, 0x68, 0x65, 0x6d, 0x65, 0x22, 0x3d, 0x0a, 0x10,
+	0x53, 0x69, 0x67, 0x6e, 0x61, 0x74, 0x75, 0x72, 0x65, 0x52, 0x46, 0x43, 0x36, 0x39, 0x37, 0x39,
+	0x12, 0x10, 0x0a, 0x03, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x03, 0x6b,
+	0x65, 0x79, 0x12, 0x17, 0x0a, 0x04, 0x73, 0x69, 0x67, 0x6e, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0c,
+	0x52, 0x09, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x74, 0x75, 0x72, 0x65, 0x22, 0x4e, 0x0a, 0x08, 0x43,
+	0x68, 0x65, 0x63, 0x6b, 0x73, 0x75, 0x6d, 0x12, 0x30, 0x0a, 0x04, 0x74, 0x79, 0x70, 0x65, 0x18,
+	0x01, 0x20, 0x01, 0x28, 0x0e, 0x32, 0x1c, 0x2e, 0x6e, 0x65, 0x6f, 0x2e, 0x66, 0x73, 0x2e, 0x76,
+	0x32, 0x2e, 0x72, 0x65, 0x66, 0x73, 0x2e, 0x43, 0x68, 0x65, 0x63, 0x6b, 0x73, 0x75, 0x6d, 0x54,
+	0x79, 0x70, 0x65, 0x52, 0x04, 0x74, 0x79, 0x70, 0x65, 0x12, 0x10, 0x0a, 0x03, 0x73, 0x75, 0x6d,
+	0x18, 0x02, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x03, 0x73, 0x75, 0x6d, 0x2a, 0x3d, 0x0a, 0x0f, 0x53,
+	0x69, 0x67, 0x6e, 0x61, 0x74, 0x75, 0x72, 0x65, 0x53, 0x63, 0x68, 0x65, 0x6d, 0x65, 0x12, 0x10,
+	0x0a, 0x0c, 0x45, 0x43, 0x44, 0x53, 0x41, 0x5f, 0x53, 0x48, 0x41, 0x35, 0x31, 0x32, 0x10, 0x00,
+	0x12, 0x18, 0x0a, 0x14, 0x45, 0x43, 0x44, 0x53, 0x41, 0x5f, 0x52, 0x46, 0x43, 0x36, 0x39, 0x37,
+	0x39, 0x5f, 0x53, 0x48, 0x41, 0x32, 0x35, 0x36, 0x10, 0x01, 0x2a, 0x41, 0x0a, 0x0c, 0x43, 0x68,
+	0x65, 0x63, 0x6b, 0x73, 0x75, 0x6d, 0x54, 0x79, 0x70, 0x65, 0x12, 0x1d, 0x0a, 0x19, 0x43, 0x48,
+	0x45, 0x43, 0x4b, 0x53, 0x55, 0x4d, 0x5f, 0x54, 0x59, 0x50, 0x45, 0x5f, 0x55, 0x4e, 0x53, 0x50,
+	0x45, 0x43, 0x49, 0x46, 0x49, 0x45, 0x44, 0x10, 0x00, 0x12, 0x06, 0x0a, 0x02, 0x54, 0x5a, 0x10,
+	0x01, 0x12, 0x0a, 0x0a, 0x06, 0x53, 0x48, 0x41, 0x32, 0x35, 0x36, 0x10, 0x02, 0x42, 0x50, 0x5a,
+	0x33, 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, 0x72, 0x65, 0x66, 0x73, 0x2f, 0x67, 0x72, 0x70, 0x63, 0x3b,
+	0x72, 0x65, 0x66, 0x73, 0xaa, 0x02, 0x18, 0x4e, 0x65, 0x6f, 0x2e, 0x46, 0x69, 0x6c, 0x65, 0x53,
+	0x74, 0x6f, 0x72, 0x61, 0x67, 0x65, 0x2e, 0x41, 0x50, 0x49, 0x2e, 0x52, 0x65, 0x66, 0x73, 0x62,
+	0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -690,18 +747,19 @@ func file_refs_grpc_types_proto_rawDescGZIP() []byte {
 }
 
 var file_refs_grpc_types_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
-var file_refs_grpc_types_proto_msgTypes = make([]protoimpl.MessageInfo, 8)
+var file_refs_grpc_types_proto_msgTypes = make([]protoimpl.MessageInfo, 9)
 var file_refs_grpc_types_proto_goTypes = []interface{}{
-	(SignatureScheme)(0), // 0: neo.fs.v2.refs.SignatureScheme
-	(ChecksumType)(0),    // 1: neo.fs.v2.refs.ChecksumType
-	(*Address)(nil),      // 2: neo.fs.v2.refs.Address
-	(*ObjectID)(nil),     // 3: neo.fs.v2.refs.ObjectID
-	(*ContainerID)(nil),  // 4: neo.fs.v2.refs.ContainerID
-	(*OwnerID)(nil),      // 5: neo.fs.v2.refs.OwnerID
-	(*SubnetID)(nil),     // 6: neo.fs.v2.refs.SubnetID
-	(*Version)(nil),      // 7: neo.fs.v2.refs.Version
-	(*Signature)(nil),    // 8: neo.fs.v2.refs.Signature
-	(*Checksum)(nil),     // 9: neo.fs.v2.refs.Checksum
+	(SignatureScheme)(0),     // 0: neo.fs.v2.refs.SignatureScheme
+	(ChecksumType)(0),        // 1: neo.fs.v2.refs.ChecksumType
+	(*Address)(nil),          // 2: neo.fs.v2.refs.Address
+	(*ObjectID)(nil),         // 3: neo.fs.v2.refs.ObjectID
+	(*ContainerID)(nil),      // 4: neo.fs.v2.refs.ContainerID
+	(*OwnerID)(nil),          // 5: neo.fs.v2.refs.OwnerID
+	(*SubnetID)(nil),         // 6: neo.fs.v2.refs.SubnetID
+	(*Version)(nil),          // 7: neo.fs.v2.refs.Version
+	(*Signature)(nil),        // 8: neo.fs.v2.refs.Signature
+	(*SignatureRFC6979)(nil), // 9: neo.fs.v2.refs.SignatureRFC6979
+	(*Checksum)(nil),         // 10: neo.fs.v2.refs.Checksum
 }
 var file_refs_grpc_types_proto_depIdxs = []int32{
 	4, // 0: neo.fs.v2.refs.Address.container_id:type_name -> neo.fs.v2.refs.ContainerID
@@ -806,6 +864,18 @@ func file_refs_grpc_types_proto_init() {
 			}
 		}
 		file_refs_grpc_types_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SignatureRFC6979); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_refs_grpc_types_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Checksum); i {
 			case 0:
 				return &v.state
@@ -824,7 +894,7 @@ func file_refs_grpc_types_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_refs_grpc_types_proto_rawDesc,
 			NumEnums:      2,
-			NumMessages:   8,
+			NumMessages:   9,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/refs/types.go b/refs/types.go
index dbe307a..7d89881 100644
--- a/refs/types.go
+++ b/refs/types.go
@@ -35,8 +35,7 @@ type SignatureScheme uint32
 
 //nolint:revive
 const (
-	UnspecifiedScheme SignatureScheme = iota
-	ECDSA_SHA512
+	ECDSA_SHA512 SignatureScheme = iota
 	ECDSA_RFC6979_SHA256
 )
 
@@ -189,7 +188,7 @@ func (s *Signature) GetScheme() SignatureScheme {
 	if s != nil {
 		return s.scheme
 	}
-	return UnspecifiedScheme
+	return 0
 }
 
 func (s *Signature) SetScheme(scheme SignatureScheme) {
diff --git a/util/signature/data.go b/util/signature/data.go
index ee2d7ad..cd02d88 100644
--- a/util/signature/data.go
+++ b/util/signature/data.go
@@ -41,13 +41,13 @@ func SignDataWithHandler(key *ecdsa.PrivateKey, src DataSource, handler KeySigna
 		opts[i](cfg)
 	}
 
-	sigData, err := sign(cfg, cfg.defaultScheme, key, data)
+	sigData, err := sign(cfg, key, data)
 	if err != nil {
 		return err
 	}
 
 	sig := new(refs.Signature)
-	sig.SetScheme(cfg.defaultScheme)
+	sig.SetScheme(cfg.scheme)
 	sig.SetKey(crypto.MarshalPublicKey(&key.PublicKey))
 	sig.SetSign(sigData)
 	handler(sig)
diff --git a/util/signature/options.go b/util/signature/options.go
index c77c290..dd38986 100644
--- a/util/signature/options.go
+++ b/util/signature/options.go
@@ -9,51 +9,45 @@ import (
 )
 
 type cfg struct {
-	defaultScheme  refs.SignatureScheme
-	restrictScheme refs.SignatureScheme
+	schemeFixed bool
+	scheme      refs.SignatureScheme
 }
 
 func defaultCfg() *cfg {
-	return &cfg{
-		defaultScheme:  refs.ECDSA_SHA512,
-		restrictScheme: refs.UnspecifiedScheme,
-	}
+	return new(cfg)
 }
 
 func verify(cfg *cfg, data []byte, sig *refs.Signature) error {
-	scheme := sig.GetScheme()
-	if scheme == refs.UnspecifiedScheme {
-		scheme = cfg.defaultScheme
-	}
-	if cfg.restrictScheme != refs.UnspecifiedScheme && scheme != cfg.restrictScheme {
-		return fmt.Errorf("%w: unexpected signature scheme", crypto.ErrInvalidSignature)
+	if !cfg.schemeFixed {
+		cfg.scheme = sig.GetScheme()
 	}
 
 	pub := crypto.UnmarshalPublicKey(sig.GetKey())
-	switch scheme {
+
+	switch cfg.scheme {
 	case refs.ECDSA_SHA512:
 		return crypto.Verify(pub, data, sig.GetSign())
 	case refs.ECDSA_RFC6979_SHA256:
 		return crypto.VerifyRFC6979(pub, data, sig.GetSign())
 	default:
-		return crypto.ErrInvalidSignature
+		return fmt.Errorf("unsupported signature scheme %s", cfg.scheme)
 	}
 }
 
-func sign(cfg *cfg, scheme refs.SignatureScheme, key *ecdsa.PrivateKey, data []byte) ([]byte, error) {
-	switch scheme {
+func sign(cfg *cfg, key *ecdsa.PrivateKey, data []byte) ([]byte, error) {
+	switch cfg.scheme {
 	case refs.ECDSA_SHA512:
 		return crypto.Sign(key, data)
 	case refs.ECDSA_RFC6979_SHA256:
 		return crypto.SignRFC6979(key, data)
 	default:
-		panic("unsupported scheme")
+		panic(fmt.Sprintf("unsupported scheme %s", cfg.scheme))
 	}
 }
 
 func SignWithRFC6979() SignOption {
 	return func(c *cfg) {
-		c.defaultScheme = refs.ECDSA_RFC6979_SHA256
-		c.restrictScheme = refs.ECDSA_RFC6979_SHA256
+		c.schemeFixed = true
+		c.scheme = refs.ECDSA_RFC6979_SHA256
 	}
 }