Lets say I have a message that needs to be signed by two keys that were generated using ECDSA
Is it possible to make a signature that accounts for both keys, meaning I can verify with both and see they are valid?
An example, if we need a cryptocurrency example:
Address 1 has 10 coins Address 2 has 10 coins
Both inputs are in the transaction, and now need to be signed. Is it possible to make it so only one signature is made, but accounts for both addresses?