Your signed message is your identity on forum. Make sure you're printing one of your's.
The ability to sign messages is useful in a variety of situations. Recently, I used it to claim NIGHT tokens, which were specifically distributed to Bitcoin holders by
Clacier Drop . The private keys required to sign the messages for claiming these tokens were controlled by my Passport Core, so I used this hardware wallet
paired with the Sparrow client to sign the relevant messages.