Quote from: pooya87 on Today at 03:37:29 AM

focusing too much on how it can use the bitcoin core code-base instead of coming up with an algorithm to sign messages in general.

I think you're mistaken.

If you want something that signs messages in general use GPG. It would be an extremely bad practice to come up with some novel cryptosystem just to sign messages when established audited and mature alternatives exists.

Bitcoin uses a novel cryptosystem for signing transactions called Bitcoin Script which allows all sorts of complex constraints on the signatures. It's why with Bitcoin you can do multisig-- but for GPG and whatnot, you can't really (technically it could be done, but would need complex MPC crypto which no one implements).

Sometimes you want to sign messages with bitcoin addresses, e.g. to have the operator of an address attest to something.

If you're going to do that and support all addresses, then you need to use Bitcoin script to do it. In doing so, you pick up some of the structure that goes around script-- some of which may not be as useful outside of the blockchain.

So I don't think anyone particularly wants to use the bitcoin core code base-- but rather they want a signmessage that works for all Bitcoin addresses.