Libbitcoin for Core people

[andrewtoth]

@evoskuil

If the prevout doesn’t exist then the input script will fail to validate. That’s just a query for the output during block.connect, which requires no order and is performed concurrently across blocks.

I don’t see how this requires no order though. If the transaction which contains the prevout has not been stored yet then this check will fail even if it does exist.