So, I'm working with a system that allows individual users to each have their own private-public key pair.
I would like to allow multiple users to use their private key to sign the same piece of information to confirm they agree with something. By signature, I mean the public key can be used to check the signature is valid.
However, space is at a premium. So is there a way to compress those multiple signatures of the same data?
Using Curve25519, but other algorithms might be acceptable.