Bitcoin Covenants part 3: SIGHASH_ANYPREVOUT
APO lets a Bitcoin signature authorize any compatible UTXO rather than one fixed outpoint. It allows for rebindable pre-signed transactions for Lightning, vaults, and layer-2 protocols without new key management overhead.
Source：Cointelegraph
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Source：https://cointelegraph.com/research/bitcoin-covenants-part-3-sighash-anyprevout