/**
* Returns a solved block that builds on top of this one. This exists for unit tests. In this
* variant you can specify a public key (pubkey) for use in generating coinbase blocks.
*/
Block createNextBlock(
Address to, TransactionOutPoint prevOut, long time, byte[] pubKey, BigInteger coinbaseValue) {
Block b = new Block(params);
b.setDifficultyTarget(difficultyTarget);
b.addCoinbaseTransaction(pubKey, coinbaseValue);
if (to != null) {
// Add a transaction paying 50 coins to the "to" address.
Transaction t = new Transaction(params);
t.addOutput(new TransactionOutput(params, t, Utils.toNanoCoins(50, 0), to));
// The input does not really need to be a valid signature, as long as it has the right general
// form.
TransactionInput input;
if (prevOut == null) {
input = new TransactionInput(params, t, Script.createInputScript(EMPTY_BYTES, EMPTY_BYTES));
// Importantly the outpoint hash cannot be zero as that's how we detect a coinbase
// transaction in isolation
// but it must be unique to avoid 'different' transactions looking the same.
byte[] counter = new byte[32];
counter[0] = (byte) txCounter++;
counter[1] = 1;
input.getOutpoint().setHash(new Sha256Hash(counter));
} else {
input =
new TransactionInput(
params, t, Script.createInputScript(EMPTY_BYTES, EMPTY_BYTES), prevOut);
}
t.addInput(input);
b.addTransaction(t);
}
b.setPrevBlockHash(getHash());
// Don't let timestamp go backwards
if (getTimeSeconds() >= time) b.setTime(getTimeSeconds() + 1);
else b.setTime(time);
b.solve();
try {
b.verifyHeader();
} catch (VerificationException e) {
throw new RuntimeException(e); // Cannot happen.
}
return b;
}
/** Verifies both the header and that the transactions hash to the merkle root. */
public void verify() throws VerificationException {
verifyHeader();
verifyTransactions();
}