diff --git a/util/proto/test/test.pb.go b/util/proto/test/test.pb.go
index f581442..91c3f8b 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        v3.11.4
 // 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..2ef4b19 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        v3.11.4
 // 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..13c3bf9 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        v3.11.4
 // 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 a421a7c..2e9656b 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        v3.11.4
 // source: v2/acl/grpc/types.proto
 
 package acl
@@ -471,6 +471,9 @@ func (x *EACLTable) GetRecords() []*EACLRecord {
 // like [JWT](https://jwt.io), it has a limited lifetime and scope, hence can be
 // used in the similar use cases, like providing authorisation to externally
 // authenticated party.
+//
+// BearerToken can be issued only by container's owner and must be signed using
+// the key associated with container's `OwnerID`.
 type BearerToken struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -529,6 +532,28 @@ func (x *BearerToken) GetSignature() *grpc.Signature {
 }
 
 // Filter to check particular properties of the request or object.
+//
+// By default `key` field refers to the corresponding object's `Attribute`.
+// Some Object's header fields can also be accessed by adding `$Object:`
+// prefix to the name. Here is the list of fields available via this prefix:
+//
+// * $Object:version \
+//   version
+// * $Object:containerID \
+//   container_id
+// * $Object:ownerID \
+//   owner_id
+// * $Object:creationEpoch \
+//   creation_epoch
+// * $Object:payloadLength \
+//   payload_length
+// * $Object:payloadHash \
+//   payload_hash
+// * $Object:objectType \
+//   object_type
+// * $Object:homomorphicHash \
+//   homomorphic_hash
+//
 type EACLRecord_Filter struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -539,9 +564,9 @@ type EACLRecord_Filter struct {
 	// Match operation type
 	MatchType MatchType `protobuf:"varint,2,opt,name=match_type,json=matchType,proto3,enum=neo.fs.v2.acl.MatchType" json:"match_type,omitempty"`
 	// Name of the Header to use
-	HeaderName string `protobuf:"bytes,3,opt,name=header_name,json=headerName,proto3" json:"header_name,omitempty"`
+	Key string `protobuf:"bytes,3,opt,name=key,proto3" json:"key,omitempty"`
 	// Expected Header Value or pattern to match
-	HeaderVal string `protobuf:"bytes,4,opt,name=header_val,json=value,proto3" json:"header_val,omitempty"`
+	Value string `protobuf:"bytes,4,opt,name=value,proto3" json:"value,omitempty"`
 }
 
 func (x *EACLRecord_Filter) Reset() {
@@ -590,16 +615,16 @@ func (x *EACLRecord_Filter) GetMatchType() MatchType {
 	return MatchType_MATCH_TYPE_UNSPECIFIED
 }
 
-func (x *EACLRecord_Filter) GetHeaderName() string {
+func (x *EACLRecord_Filter) GetKey() string {
 	if x != nil {
-		return x.HeaderName
+		return x.Key
 	}
 	return ""
 }
 
-func (x *EACLRecord_Filter) GetHeaderVal() string {
+func (x *EACLRecord_Filter) GetValue() string {
 	if x != nil {
-		return x.HeaderVal
+		return x.Value
 	}
 	return ""
 }
@@ -673,8 +698,8 @@ type BearerToken_Body struct {
 	// Table of Extended ACL rules to use instead of the ones attached to the
 	// container
 	EaclTable *EACLTable `protobuf:"bytes,1,opt,name=eacl_table,json=eaclTable,proto3" json:"eacl_table,omitempty"`
-	// `OwnerID` to whom the token was issued. MUST match with the request
-	// originator's `OwnerID`
+	// `OwnerID` to whom the token was issued. Must match the request
+	// originator's `OwnerID`. If empty, any token bearer will be accepted.
 	OwnerId *grpc.OwnerID `protobuf:"bytes,2,opt,name=owner_id,json=ownerID,proto3" json:"owner_id,omitempty"`
 	// Token expiration and valid time period parameters
 	Lifetime *BearerToken_Body_TokenLifetime `protobuf:"bytes,3,opt,name=lifetime,proto3" json:"lifetime,omitempty"`
@@ -808,7 +833,7 @@ var file_v2_acl_grpc_types_proto_rawDesc = []byte{
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@@ -823,7 +848,7 @@ var file_v2_acl_grpc_types_proto_rawDesc = []byte{
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@@ -831,80 +856,78 @@ var file_v2_acl_grpc_types_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/v2/container/grpc/service.pb.go b/v2/container/grpc/service.pb.go
index 68d8392..6edd4ce 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        v3.11.4
 // 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 28c23cf..5103e7d 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        v3.11.4
 // source: v2/container/grpc/types.proto
 
 package container
@@ -132,9 +132,16 @@ func (x *Container) GetPlacementPolicy() *grpc1.PlacementPolicy {
 //
 // There are some "well-known" attributes affecting system behaviour:
 //
-// * Subnet \
+// * __NEOFS__SUBNET \
 //   String ID of container's storage subnet. Container can be attached to
 //   only one subnet.
+//
+// And some well-known attributes used by applications only:
+//
+// * Name \
+//   Human-friendly name
+// * Timestamp \
+//   User-defined local time of container creation in Unix Timestamp format
 type Container_Attribute struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
diff --git a/v2/netmap/grpc/service.pb.go b/v2/netmap/grpc/service.pb.go
index 721f282..b30be26 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        v3.11.4
 // 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..9bc0e1d 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        v3.11.4
 // source: v2/netmap/grpc/types.proto
 
 package netmap
diff --git a/v2/object/grpc/service.pb.go b/v2/object/grpc/service.pb.go
index 0f82c0f..3a49b0d 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        v3.11.4
 // source: v2/object/grpc/service.proto
 
 package object
@@ -1866,7 +1866,45 @@ func (x *SearchRequest_Body) GetFilters() []*SearchRequest_Body_Filter {
 	return nil
 }
 
-// Filter structure
+// Filter structure checks if object header field or attribute content
+// matches a value.
+//
+// By default `key` field refers to the corresponding object's `Attribute`.
+// Some Object's header fields can also be accessed by adding `$Object:`
+// prefix to the name. Here is the list of fields available via this prefix:
+//
+// * $Object:version \
+//   version
+// * $Object:containerID \
+//   container_id
+// * $Object:ownerID \
+//   owner_id
+// * $Object:creationEpoch \
+//   creation_epoch
+// * $Object:payloadLength \
+//   payload_length
+// * $Object:payloadHash \
+//   payload_hash
+// * $Object:objectType \
+//   object_type
+// * $Object:homomorphicHash \
+//   homomorphic_hash
+// * $Object:split.parent \
+//   object_id of parent
+//
+// There are some well-known filter aliases to match objects by certain
+// properties:
+//
+// * $Object:ROOT \
+//   With the `value` set to `true` checks if an object is a top object in a
+//   split hierarchy. With other values returns non-root objects.
+// * $Object:LEAF \
+//   With the `value` set to `true` checks if an object is a leaf in a split
+//   hierarchy. With other values returns non-leaf objects.
+// * $Object:CHILDFREE \
+//   With the `value` set to `true` checks if an object has empty
+//   children list in `Split` header. With other values returns
+//   non-childfree objects.
 type SearchRequest_Body_Filter struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1874,9 +1912,9 @@ type SearchRequest_Body_Filter struct {
 
 	// Match type to use
 	MatchType MatchType `protobuf:"varint,1,opt,name=match_type,json=matchType,proto3,enum=neo.fs.v2.object.MatchType" json:"match_type,omitempty"`
-	// Header name to match
-	Name string `protobuf:"bytes,2,opt,name=name,proto3" json:"name,omitempty"`
-	// Header value to match
+	// Attribute or Header fields to match
+	Key string `protobuf:"bytes,2,opt,name=key,proto3" json:"key,omitempty"`
+	// Value to match
 	Value string `protobuf:"bytes,3,opt,name=value,proto3" json:"value,omitempty"`
 }
 
@@ -1919,9 +1957,9 @@ func (x *SearchRequest_Body_Filter) GetMatchType() MatchType {
 	return MatchType_MATCH_TYPE_UNSPECIFIED
 }
 
-func (x *SearchRequest_Body_Filter) GetName() string {
+func (x *SearchRequest_Body_Filter) GetKey() string {
 	if x != nil {
-		return x.Name
+		return x.Key
 	}
 	return ""
 }
@@ -2425,7 +2463,7 @@ var file_v2_object_grpc_service_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/v2/object/grpc/types.pb.go b/v2/object/grpc/types.pb.go
index 8e64894..fd62c34 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        v3.11.4
 // source: v2/object/grpc/types.proto
 
 package object
@@ -442,8 +442,19 @@ func (x *Object) GetPayload() []byte {
 // There are some "well-known" attributes starting with `__NEOFS__` prefix
 // that affect system behaviour:
 //
-// * __NEOFS__UPLOAD_ID
-// * __NEOFS__EXPIRATION_EPOCH
+// * __NEOFS__UPLOAD_ID \
+//   Marks smaller parts of a split bigger object
+// * __NEOFS__EXPIRATION_EPOCH \
+//   Tells GC to delete object after that epoch
+//
+// And some well-known attributes used by applications only:
+//
+// * Name \
+//   Human-friendly name
+// * FileName \
+//   File name to be associated with the object on saving
+// * Timestamp \
+//   User-defined local time of object creation in Unix Timestamp format
 //
 // For detailed description of each well-known attribute please see the
 // corresponding section in NeoFS Technical specification.
diff --git a/v2/refs/grpc/types.pb.go b/v2/refs/grpc/types.pb.go
index c9994bd..2d4be15 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        v3.11.4
 // source: v2/refs/grpc/types.proto
 
 package refs
diff --git a/v2/session/grpc/service.pb.go b/v2/session/grpc/service.pb.go
index 712500e..19f9e62 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        v3.11.4
 // 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 7140ceb..ac38c54 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        v3.11.4
 // 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..5b00a18 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        v3.11.4
 // source: v2/storagegroup/grpc/types.proto
 
 package storagegroup