How to check a signature on an arbitrary message?

0

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?

Mohsen

Posted 2019-07-19T04:50:31.987

Reputation: 1

Answers

1

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

Andrew Chow

Posted 2019-07-19T04:50:31.987

Reputation: 40 910

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 – 2019-07-22T16:02:08.147

Asked: 2019-07-19T04:50:31.987

Viewed: 28 times

Active: 2019-07-19T05:08:21.190