Going by the example here: https://bitcoinj.github.io/working-with-contracts
I believe I've done everything correctly. Yet my program fails either to
propagate correctly or because of a tx error and I cannot determine why
A few things I believe to be the reason
1) My peergroup.broadcastTransaction(spendTx) is not broadcasting properly
2) A malformed raw transaction or scriptsig ( I assume it is this, but
again, no errors)
3) Generally not understanding the best method of linking outputs to inputs
and signing them appropriately (for instance, do I use UTXO class, or
TransactionSignature)
3) Trying to spend funds from a watched address. I have the necessary keys
to unlock the UTXO's but I would like to see if I can spend the funds
without the use of the wallet class
4) Multisig support in general for bitcoinj is lacking or incomplete. i
hope it's not this as I would really like to get this working. But -- I
don't think this is the biggest issue because I ran the unit tests and they
still all check out clean.
A step through the code to be thorough:
Create 3 ECKeys for a 2-of-3 multisig contract, put them into a list,
create a redeem script that sorts keys in lexicographical order and writes
a m-of-n multisigoutputscript, then instantiate a Transaction object and
assign it as the OUTPUT that I will be using as my INPUT (amount +
redeemscript) AKA the UTXO that I will be spending
ECKey keyA = new ECKey();
ECKey keyB = new ECKey();
ECKey keyC = new ECKey();
List<ECKey> keys = ImmutableList.of(key1, key2, key3);
Script script = ScriptBuilder.createRedeemScript(2, keys);
Transaction contract = new Transaction(params);
TransactionOutput multiSigOutput = contract.addOutput(Coin.valueOf(50000),
script);
Create a second transaction object that I will be using to assemble the
output script AKA the (value + destination) address that i will be signing
my UTXO over to. Also where the sigHash is signed by 2 of my keys and
added to the scriptSig of the transaction
Transaction spendTx = new Transaction(params);
Address address = Address.fromBase58(params,
"19EfMrs5WkcvtBBnuEqP6v1yppeWww61Kc");
Script outputScript =
ScriptBuilder.createOutputScript(address);
spendTx.addOutput(multiSigOutput.getValue(),
outputScript);
// System.out.println(spendTx.getOutputs());
TransactionInput input =
spendTx.addInput(multiSigOutput);
now manually sign the inputs...(signatures are in same order as they are in
script)
//sign transaction manually
Sha256Hash sigHash = spendTx.hashForSignature(0, script,
Transaction.SigHash.ALL, false);
ECKey.ECDSASignature signature = list.get(0).sign(sigHash);
ECKey.ECDSASignature signature1 = list.get(1).sign(sigHash);
TransactionSignature txSig = new TransactionSignature(signature,
Transaction.SigHash.ALL, false);
TransactionSignature txSig1 = new TransactionSignature(signature1,
Transaction.SigHash.ALL, false);
...now create multisiginputscript, validate and broadcast tx
Script inputScript =
ScriptBuilder.createMultiSigInputScript((ImmutableList.of(txSig, txSig1)));
// System.out.println(inputScript);
input.setScriptSig(inputScript);
input.verify(multiSigOutput);
peerGroup.broadcastTransaction(spendTx);
System.out.println(kit.peerGroup().getConnectedPeers());
System.out.println("transaction broadcasted");
ok...this doesn't propagate, but the verification checks out. and I don't
even know if it's so much a network problem as it is a code problem because
when I change the value in the output script to > the balance of the UTXO
it doesn't throw a InsufficientMoneyException like I imagine it should.
I'd show some error logs but there aren't any. The only error is when I
change the createmultisiginputscript to createP2SHmultisiginputscript, the
console puts out a non-null nulldummy error which I also have problems
fixing, so I've never been able to know if changing to that method is the
correct fix either. I think I set up the connection to the peergroup
correctly as well
File chainFile = new File(this.getFilesDir(), "test.spvchain");
System.out.println("does chainfile exist?" + chainFile.exists());
if(chainFile.exists()) {
try {
SPVBlockStore chainStore = new SPVBlockStore(params, chainFile);
BlockChain chain = new BlockChain(params, chainStore);
peerGroup = new PeerGroup(params, chain);
peerGroup.addPeerDiscovery(new DnsDiscovery(params));
peerGroup.startAsync();
} catch (BlockStoreException e) {
e.printStackTrace();
}
So I don't really get it... I've come to the conclusion my understanding is
off somehow. Sorry for the confusing long post. It's been days. Can
anyone help?
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