Comments are local to your wallet. They are not transmitted via the
Bitcoin P2P network. Also if you replay your wallet, they will currently
be lost.
Apart from that, you can just get/set the field.
On 09/12/2021 11.14, Dmitrii Pisarenko wrote:
Hello!
I have a addCoinsReceivedEventListener which is invoked whenever I send
Bitcoin to the correct address via bitcoin-cli (using a call like
`bitcoin-cli -regtest sendtoaddress 2MwnQZ9zqU7hH9h4DVWiudGeuPS1GbQRGrx 1`):
kit.wallet().addCoinsReceivedEventListener((wallet, tx, prevBalance,
newBalance) -> {
// I want to read transaction comment here
});
I want to be able to add a comment to a transaction.
When I send Bitcoin, I use this command:
bitcoin-cli -regtest sendtoaddress 2MwnQZ9zqU7hH9h4DVWiudGeuPS1GbQRGrx 1
"Comment 4"
Questions:
1. Is it possible to read the comment ("Comment 4" in this case) in the
addCoinsReceivedEventListener? If yes, how?
2. Am using the correct bitcoin-cli command to send Bitcoin with comment?
Thanks in advance
Dmitrii Pisarenko
P. S.: Below you can find the full source code of the wallet listener.
import org.bitcoinj.core.Address;
import org.bitcoinj.core.Coin;
import org.bitcoinj.kits.WalletAppKit;
import org.bitcoinj.utils.BriefLogFormatter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import javax.annotation.PostConstruct;
import java.io.File;
import java.util.Optional;
@Component
public class WalletObserver {
@Autowired
ClojureService clojureService;
@Value("${accounts.btc.exchange.address}")
String exchangeAddress;
@PostConstruct
public void init() {
BriefLogFormatter.init();
final LocalTestNetParams netParams = new LocalTestNetParams();
netParams.setPort(18444);
try {
final WalletAppKit kit = new WalletAppKit(netParams, new
File("."), "_minimalCryptoExchangeBtcWallet");
kit.connectToLocalHost();
kit.startAsync();
kit.awaitRunning();
kit.wallet().addWatchedAddress(Address.fromString(netParams,
exchangeAddress));
kit.wallet().addCoinsReceivedEventListener((wallet, tx,
prevBalance, newBalance) -> {
// I want to read transaction comment here
});
}
catch (Exception exception) {
exception.printStackTrace();
}
}
}
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