Sorry pump for this thread.
May I know enough reason or not when recovery hacked account trough SIGNED MESSAGE ETHEREUM? my friend account got hack and several post proof in service signature campaign using Binance segwit BTC address.
SIGNED MESSAGE BITCOIN only available when using Blockchain Bitcoin address, if using another bitcoin address seems can't signed with Bitcoin message.
Does he have any Ethereum address in any proof of authentication post? If yes, then he can sign a message using the ethereum address and include it in a message to account recoveries team
Tell him to follow this procedure to recover his hacked account -
https://bitcointalk.org/index.php?topic=5089777.0