now the miner (in this case antpool) has come forward and wants to refund the 83BTC to the victimized user
however, the miner would have to fulfill certain requirements in order to be able to prove the identity of the previous owner of the 83BTC
he would have to use Electrum or Bitcoin Core as a wallet and sign the message 'AntPool' using the pk of the bc1qn3d7vyks0k3fx38xkxazpep8830ttmydwekrnl address and send the output as signed text by e-mail to the support
here is the official announcement:
I saw a message from Antpool on twitter and was kinda surprised at how simple their requirements are for proving ownership of that address. You'd think they would wanna be more careful, considering the situation. A hacker/scammer can also sign an address. But I guess they either don't fully get or care that the private key is likely out there with multiple parties who could sign that address if they wanted and that level of proof doesn't seem nearly good enough to me for this particular case.