code: func (c *Client) ListSinceBlock(blockHash *chainhash.Hash) (*btcjson.ListSinceBlockResult, error) {
  	return c.ListSinceBlockAsync(blockHash).Receive()
  }
docs: // ListSinceBlock returns all transactions added in blocks since the specified
  // block hash, or all transactions if it is nil, using the default number of
  // minimum confirmations as a filter.
  //
  // See ListSinceBlockMinConf to override the minimum number of confirmations.