BIP442: OP_PAIRCOMMIT

`OP_PAIRCOMMIT` is the newest member of the LNhance family of opcodes. It provides limited vector commitment functionality in tapscript. When evaluated, the `OP_PAIRCOMMIT` instruction: * pops the top two values off the stack, * takes the "PairCommit" tagged SHA256 hash of the stack elements, * pushes the resulting commitment on the top of the stack. Discussion: https://delvingbitcoin.org/t/op-paircommit-as-a-candidate-for-addition-to-lnhance/1216/12 Mail list proposal: https://groups.google.

Specification