OP_APO
Protocol Upgrade
Opcode
SIGHASH_ANYPREVOUT (OP_APO), proposed in BIP-118, modifies Bitcoin’s signature hashing to allow inputs to commit to scriptPubKey without specific UTXO, enabling efficient off-chain protocols like eltoo. It’s been tested on signet since 2022, with active community discussion for Lightning Network enhancements.
Status & Details
Testnet
BIP Reference
BIP-118
Impact Areas
Scalability
Programmability