code: func (c *Client) SetAccountAsync(address btcutil.Address, account string) FutureSetAccountResult {
  	addr := address.EncodeAddress()
  	cmd := btcjson.NewSetAccountCmd(addr, account)
  	return c.sendCmd(cmd)
  }
docs: // SetAccountAsync 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 SetAccount for the blocking version and more details.