code: func (r FutureSendManyResult) Receive() (*chainhash.Hash, error) {
  	res, err := receiveFuture(r)
  	if err != nil {
  		return nil, err
  	}
  
  	// Unmashal result as a string.
  	var txHash string
  	err = json.Unmarshal(res, &txHash)
  	if err != nil {
  		return nil, err
  	}
  
  	return chainhash.NewHashFromStr(txHash)
  }
docs: // Receive waits for the response promised by the future and returns the hash
  // of the transaction sending multiple amounts to multiple addresses using the
  // provided account as a source of funds.