public static Block getECBlock(int timestamp) {
Block block = blockchain.getLastBlock();
if (timestamp < block.getTimestamp() - 15) {
throw new IllegalArgumentException(
"Timestamp cannot be more than 15 s earlier than last block timestamp: "
+ block.getTimestamp());
}
int distance = 0;
while (block.getTimestamp() > timestamp - Constants.EC_RULE_TERMINATOR
&& distance < Constants.EC_BLOCK_DISTANCE_LIMIT) {
block = blockchain.getBlock(block.getPreviousBlockId());
distance += 1;
}
return block;
}
public static boolean verifyFork(Transaction transaction) {
if (blockchain.getHeight() < Constants.DIGITAL_GOODS_STORE_BLOCK) {
return true;
}
if (transaction.getReferencedTransactionFullHash() != null) {
return true;
}
if (blockchain.getHeight() < Constants.EC_CHANGE_BLOCK_1) {
if (blockchain.getHeight() - transaction.getECBlockHeight()
> Constants.EC_BLOCK_DISTANCE_LIMIT) {
return false;
}
}
Block ecBlock = blockchain.getBlock(transaction.getECBlockId());
return ecBlock != null && ecBlock.getHeight() == transaction.getECBlockHeight();
}