code: func (c *Client) GetBlockVerboseTxAsync(blockHash *chainhash.Hash) FutureGetBlockVerboseResult {
  	hash := ""
  	if blockHash != nil {
  		hash = blockHash.String()
  	}
  
  	cmd := btcjson.NewGetBlockCmd(hash, btcjson.Bool(true), btcjson.Bool(true))
  	return c.sendCmd(cmd)
  }
docs: // GetBlockVerboseTxAsync returns an instance of a type that can be used to get
  // the result of the RPC at some future time by invoking the Receive function on
  // the returned instance.
  //
  // See GetBlockVerboseTx or the blocking version and more details.