diff --git a/pkg/service/control/client/client.go b/pkg/service/control/client/client.go
index e3bf937..330ce10 100644
--- a/pkg/service/control/client/client.go
+++ b/pkg/service/control/client/client.go
@@ -94,7 +94,7 @@ func (c *Client) RemovePolicies(ctx context.Context, policies []PolicyInfo) erro
 	for i := range policies {
 		chainInfos[i] = &control.RemovePoliciesRequest_ChainInfo{
 			Namespace: policies[i].Namespace,
-			ChainID:   string(policies[i].ChainID),
+			ChainID:   []byte(policies[i].ChainID),
 		}
 	}
 
@@ -116,7 +116,7 @@ func (c *Client) GetPolicy(ctx context.Context, namespace string, chainID chain.
 	req := &control.GetPolicyRequest{
 		Body: &control.GetPolicyRequest_Body{
 			Namespace: namespace,
-			ChainID:   string(chainID),
+			ChainID:   []byte(chainID),
 		},
 	}
 
diff --git a/pkg/service/control/server/server.go b/pkg/service/control/server/server.go
index dda96ea..6396c1f 100644
--- a/pkg/service/control/server/server.go
+++ b/pkg/service/control/server/server.go
@@ -185,7 +185,7 @@ func (s *Server) removePolicy(info *control.RemovePoliciesRequest_ChainInfo) err
 // If request is unsigned or signed by disallowed key, permission error returns.
 func (s *Server) GetPolicy(_ context.Context, req *control.GetPolicyRequest) (*control.GetPolicyResponse, error) {
 	s.log.Info(logs.ControlAPIGetPolicy, zap.String("namespace", req.GetBody().GetNamespace()),
-		zap.String("chainId", req.GetBody().GetChainID()), zap.String("key", hex.EncodeToString(req.Signature.Key)))
+		zap.Binary("chainId", req.GetBody().GetChainID()), zap.String("key", hex.EncodeToString(req.Signature.Key)))
 
 	// verify request
 	if err := s.isValidRequest(req); err != nil {
@@ -219,9 +219,9 @@ func (s *Server) ListPolicies(_ context.Context, req *control.ListPoliciesReques
 		return nil, status.Error(codes.InvalidArgument, err.Error())
 	}
 
-	res := make([]string, len(chains))
+	res := make([][]byte, len(chains))
 	for i := range chains {
-		res[i] = string(chains[i].ID)
+		res[i] = []byte(chains[i].ID)
 	}
 
 	return &control.ListPoliciesResponse{Body: &control.ListPoliciesResponse_Body{ChainIDs: res}}, nil
diff --git a/pkg/service/control/service.pb.go b/pkg/service/control/service.pb.go
index 3e7c068..d344f5c 100644
--- a/pkg/service/control/service.pb.go
+++ b/pkg/service/control/service.pb.go
@@ -939,7 +939,7 @@ type RemovePoliciesRequest_ChainInfo struct {
 	// Namespace.
 	Namespace string `protobuf:"bytes,1,opt,name=namespace,proto3" json:"namespace,omitempty"`
 	// Chain id to remove.
-	ChainID string `protobuf:"bytes,2,opt,name=chainID,proto3" json:"chainID,omitempty"`
+	ChainID []byte `protobuf:"bytes,2,opt,name=chainID,proto3" json:"chainID,omitempty"`
 }
 
 func (x *RemovePoliciesRequest_ChainInfo) Reset() {
@@ -981,11 +981,11 @@ func (x *RemovePoliciesRequest_ChainInfo) GetNamespace() string {
 	return ""
 }
 
-func (x *RemovePoliciesRequest_ChainInfo) GetChainID() string {
+func (x *RemovePoliciesRequest_ChainInfo) GetChainID() []byte {
 	if x != nil {
 		return x.ChainID
 	}
-	return ""
+	return nil
 }
 
 type RemovePoliciesRequest_Body struct {
@@ -1081,7 +1081,7 @@ type GetPolicyRequest_Body struct {
 	// Namespace.
 	Namespace string `protobuf:"bytes,1,opt,name=namespace,proto3" json:"namespace,omitempty"`
 	// Chain id to remove.
-	ChainID string `protobuf:"bytes,2,opt,name=chainID,proto3" json:"chainID,omitempty"`
+	ChainID []byte `protobuf:"bytes,2,opt,name=chainID,proto3" json:"chainID,omitempty"`
 }
 
 func (x *GetPolicyRequest_Body) Reset() {
@@ -1123,11 +1123,11 @@ func (x *GetPolicyRequest_Body) GetNamespace() string {
 	return ""
 }
 
-func (x *GetPolicyRequest_Body) GetChainID() string {
+func (x *GetPolicyRequest_Body) GetChainID() []byte {
 	if x != nil {
 		return x.ChainID
 	}
-	return ""
+	return nil
 }
 
 type GetPolicyResponse_Body struct {
@@ -1232,7 +1232,7 @@ type ListPoliciesResponse_Body struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Chain ids.
-	ChainIDs []string `protobuf:"bytes,1,rep,name=chainIDs,proto3" json:"chainIDs,omitempty"`
+	ChainIDs [][]byte `protobuf:"bytes,1,rep,name=chainIDs,proto3" json:"chainIDs,omitempty"`
 }
 
 func (x *ListPoliciesResponse_Body) Reset() {
@@ -1267,7 +1267,7 @@ func (*ListPoliciesResponse_Body) Descriptor() ([]byte, []int) {
 	return file_pkg_service_control_service_proto_rawDescGZIP(), []int{10, 0}
 }
 
-func (x *ListPoliciesResponse_Body) GetChainIDs() []string {
+func (x *ListPoliciesResponse_Body) GetChainIDs() [][]byte {
 	if x != nil {
 		return x.ChainIDs
 	}
@@ -1345,7 +1345,7 @@ var file_pkg_service_control_service_proto_rawDesc = []byte{
 	0x0a, 0x09, 0x43, 0x68, 0x61, 0x69, 0x6e, 0x49, 0x6e, 0x66, 0x6f, 0x12, 0x1c, 0x0a, 0x09, 0x6e,
 	0x61, 0x6d, 0x65, 0x73, 0x70, 0x61, 0x63, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x09,
 	0x6e, 0x61, 0x6d, 0x65, 0x73, 0x70, 0x61, 0x63, 0x65, 0x12, 0x18, 0x0a, 0x07, 0x63, 0x68, 0x61,
-	0x69, 0x6e, 0x49, 0x44, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x07, 0x63, 0x68, 0x61, 0x69,
+	0x69, 0x6e, 0x49, 0x44, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x07, 0x63, 0x68, 0x61, 0x69,
 	0x6e, 0x49, 0x44, 0x1a, 0x55, 0x0a, 0x04, 0x42, 0x6f, 0x64, 0x79, 0x12, 0x4d, 0x0a, 0x0a, 0x63,
 	0x68, 0x61, 0x69, 0x6e, 0x49, 0x6e, 0x66, 0x6f, 0x73, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b, 0x32,
 	0x2d, 0x2e, 0x73, 0x33, 0x67, 0x77, 0x2e, 0x63, 0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0x2e, 0x52,
@@ -1372,7 +1372,7 @@ var file_pkg_service_control_service_proto_rawDesc = []byte{
 	0x69, 0x67, 0x6e, 0x61, 0x74, 0x75, 0x72, 0x65, 0x1a, 0x3e, 0x0a, 0x04, 0x42, 0x6f, 0x64, 0x79,
 	0x12, 0x1c, 0x0a, 0x09, 0x6e, 0x61, 0x6d, 0x65, 0x73, 0x70, 0x61, 0x63, 0x65, 0x18, 0x01, 0x20,
 	0x01, 0x28, 0x09, 0x52, 0x09, 0x6e, 0x61, 0x6d, 0x65, 0x73, 0x70, 0x61, 0x63, 0x65, 0x12, 0x18,
-	0x0a, 0x07, 0x63, 0x68, 0x61, 0x69, 0x6e, 0x49, 0x44, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52,
+	0x0a, 0x07, 0x63, 0x68, 0x61, 0x69, 0x6e, 0x49, 0x44, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0c, 0x52,
 	0x07, 0x63, 0x68, 0x61, 0x69, 0x6e, 0x49, 0x44, 0x22, 0xa2, 0x01, 0x0a, 0x11, 0x47, 0x65, 0x74,
 	0x50, 0x6f, 0x6c, 0x69, 0x63, 0x79, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x38,
 	0x0a, 0x04, 0x62, 0x6f, 0x64, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x24, 0x2e, 0x73,
@@ -1405,7 +1405,7 @@ var file_pkg_service_control_service_proto_rawDesc = []byte{
 	0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0x2e, 0x53, 0x69, 0x67, 0x6e, 0x61, 0x74, 0x75, 0x72, 0x65,
 	0x52, 0x09, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x74, 0x75, 0x72, 0x65, 0x1a, 0x22, 0x0a, 0x04, 0x42,
 	0x6f, 0x64, 0x79, 0x12, 0x1a, 0x0a, 0x08, 0x63, 0x68, 0x61, 0x69, 0x6e, 0x49, 0x44, 0x73, 0x18,
-	0x01, 0x20, 0x03, 0x28, 0x09, 0x52, 0x08, 0x63, 0x68, 0x61, 0x69, 0x6e, 0x49, 0x44, 0x73, 0x2a,
+	0x01, 0x20, 0x03, 0x28, 0x0c, 0x52, 0x08, 0x63, 0x68, 0x61, 0x69, 0x6e, 0x49, 0x44, 0x73, 0x2a,
 	0x57, 0x0a, 0x0c, 0x48, 0x65, 0x61, 0x6c, 0x74, 0x68, 0x53, 0x74, 0x61, 0x74, 0x75, 0x73, 0x12,
 	0x1b, 0x0a, 0x17, 0x48, 0x45, 0x41, 0x4c, 0x54, 0x48, 0x5f, 0x53, 0x54, 0x41, 0x54, 0x55, 0x53,
 	0x5f, 0x55, 0x4e, 0x44, 0x45, 0x46, 0x49, 0x4e, 0x45, 0x44, 0x10, 0x00, 0x12, 0x0c, 0x0a, 0x08,
diff --git a/pkg/service/control/service.proto b/pkg/service/control/service.proto
index 7eb40fc..dc58a44 100644
--- a/pkg/service/control/service.proto
+++ b/pkg/service/control/service.proto
@@ -104,7 +104,7 @@ message RemovePoliciesRequest {
     // Namespace.
     string namespace = 1;
     // Chain id to remove.
-    string chainID = 2;
+    bytes chainID = 2;
   }
 
   message Body {
@@ -133,7 +133,7 @@ message GetPolicyRequest {
     // Namespace.
     string namespace = 1;
     // Chain id to remove.
-    string chainID = 2;
+    bytes chainID = 2;
   }
 
   Body body = 1;
@@ -171,7 +171,7 @@ message ListPoliciesRequest {
 message ListPoliciesResponse {
   message Body {
     // Chain ids.
-    repeated string chainIDs = 1;
+    repeated bytes chainIDs = 1;
   }
 
   Body body = 1;
diff --git a/pkg/service/control/service_frostfs.pb.go b/pkg/service/control/service_frostfs.pb.go
index 2e5907c..331dfbd 100644
--- a/pkg/service/control/service_frostfs.pb.go
+++ b/pkg/service/control/service_frostfs.pb.go
@@ -408,7 +408,7 @@ func (x *RemovePoliciesRequest_ChainInfo) StableSize() (size int) {
 		return 0
 	}
 	size += proto.StringSize(1, x.Namespace)
-	size += proto.StringSize(2, x.ChainID)
+	size += proto.BytesSize(2, x.ChainID)
 	return size
 }
 
@@ -429,7 +429,7 @@ func (x *RemovePoliciesRequest_ChainInfo) StableMarshal(buf []byte) []byte {
 	}
 	var offset int
 	offset += proto.StringMarshal(1, buf[offset:], x.Namespace)
-	offset += proto.StringMarshal(2, buf[offset:], x.ChainID)
+	offset += proto.BytesMarshal(2, buf[offset:], x.ChainID)
 	return buf
 }
 
@@ -608,7 +608,7 @@ func (x *GetPolicyRequest_Body) StableSize() (size int) {
 		return 0
 	}
 	size += proto.StringSize(1, x.Namespace)
-	size += proto.StringSize(2, x.ChainID)
+	size += proto.BytesSize(2, x.ChainID)
 	return size
 }
 
@@ -629,7 +629,7 @@ func (x *GetPolicyRequest_Body) StableMarshal(buf []byte) []byte {
 	}
 	var offset int
 	offset += proto.StringMarshal(1, buf[offset:], x.Namespace)
-	offset += proto.StringMarshal(2, buf[offset:], x.ChainID)
+	offset += proto.BytesMarshal(2, buf[offset:], x.ChainID)
 	return buf
 }
 
@@ -867,7 +867,7 @@ func (x *ListPoliciesResponse_Body) StableSize() (size int) {
 	if x == nil {
 		return 0
 	}
-	size += proto.RepeatedStringSize(1, x.ChainIDs)
+	size += proto.RepeatedBytesSize(1, x.ChainIDs)
 	return size
 }
 
@@ -887,7 +887,7 @@ func (x *ListPoliciesResponse_Body) StableMarshal(buf []byte) []byte {
 		buf = make([]byte, x.StableSize())
 	}
 	var offset int
-	offset += proto.RepeatedStringMarshal(1, buf[offset:], x.ChainIDs)
+	offset += proto.RepeatedBytesMarshal(1, buf[offset:], x.ChainIDs)
 	return buf
 }