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I'm looking to have a p2sh transaction that inside the redeem script there is OP_CHECKSIG (or any other op-code) that verifies a signature on an arbitrary message (not a transaction). I have been looking, but all I could find is that OP_CHECKSIG only verifies signatures on transaction. I need a signature verification that I'm able to give the message (hash of message) to the verification procedure. Something similar to ecrecover that takes in a signature, verificationKey and the message. Is this even possible using the existing op-codes?

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No, this is not possible. There are no opcodes that allow you to check a signature on an arbitrary message.

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  • Is there any BIP for this? Do you know of any fork that has done this? I don't need it to be in production, I'm doing a research project that I'm fine with having it locally. Thanks
    – Mohsen
    Commented Jul 22, 2019 at 16:02

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