Signing a message is an (imperfect) method of demonstrating control over an address. It’s widely supported for singlesig in BIP137, but for multisig it seems BIP322 is needed. Yet I can’t seem to find user-friendly tools that support this action, does anyone know of any?
I’m a bit surprised, multisig wallets are popular and so is the activity of signing messages to verify control of an address. Is there a good reason nobody has built this out yet, or is it just a random hole in bitcoin functionality?










