Added a TxHashHex helper to calculate the transaction hash before submitting to core.
The previous code was not reversing the bytes, which is required because... reasons:
The transaction hash is considered to be a large integer encoded in little-endian format for hex-encoding.
Added a TxHashHex helper to calculate the transaction hash before submitting to core. The previous code was not reversing the bytes, which is required because... reasons: The transaction hash is considered to be a large integer encoded in little-endian format for hex-encoding.
Test uses the famous Bitcoin Pizza transaction.