James O'Beirne c589490f98 vaults: make recovery transaction explicit ...

Instead of implicitly detecting whether or not an OP_VAULT/OP_UNVAULT
spend is a recovery spend by scanning outputs for matching
scriptPubKeys, explicitly indicate recoveries by requiring a witness
stack element that is either -1 in the case of no recovery OR
corresponds to an output index that is the recovery output.

2023-02-15 13:56:22 -05:00

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