public Block createBlock(String previous, Transaction coinbase) {
Block block = new Block();
try {
Thread.sleep(1001);
} catch (InterruptedException e) {
}
block.setCreateTime(System.currentTimeMillis() / 1000);
block.setDifficultyTarget(chain.getGenesis().getDifficultyTarget());
block.setPreviousHash(previous);
block.setVersion(2);
block.setNonce(0);
block.setTransactions(new ArrayList<Transaction>());
block.getTransactions().add(coinbase);
return block;
}
