public async Task ContactSelfSignature(string signature)
        {
            var request = new ContactSelfSignatureRequest();

            request.Signature = signature;

            await grpcClient.ContactSelfSignatureAsync(request);
        }
        public override async Task ContactSelfSignature(string signature)
        {
            var request = new ContactSelfSignatureRequest
            {
                Signature = signature
            };

            await grpcClient.ContactSelfSignatureAsync(request);
        }