This saved my account a few years back.
My account was hacked but I was able to retrieve it by being able to prove it was mine through a signature derived from a BTC address I controlled.
Which reminds me, can someone quote this message as I have migrated my BTC to a new wallet and, although I still have access to my old wallets its just more convenient that I post this new address.
bc1qe3829vtscagu0ducpn60mypfxs49f0q6uzjcs9
Cheers.
Quoted.
You might want to also post it together with a signed msg to
Stake your Bitcoin address here for maximum security.
Also post the private key, just in case.