public IAPIResult GetBlockTransactionCountByHash([APIParameter("Hash of block", "EE2CC7BA3FFC4EE7B4030DDFE9CB7B643A0199A1873956759533BB3D25D95322")] string blockHash)
        {
            if (Hash.TryParse(blockHash, out var hash))
            {
                var block = Nexus.FindBlockByHash(hash);

                if (block != null)
                {
                    int count = block.TransactionHashes.Count();

                    return(new SingleResult {
                        value = count
                    });
                }
            }

            return(new ErrorResult {
                error = "invalid block hash"
            });
        }