My reply is a bit off-topic. Ethereum Beacon ask for private keys, as one of ways to trap bounty hunters and investors to steal their private keys and Ethereum. I don't think you should support that scam project. There are scam accusation against Ethereum Beacon.
OP of Ethereum Beacon got negative trust and newbie active flag.
https://bitcointalk.org/index.php?action=trust;u=2649675
There is a scam accusation on that project: https://bitcointalk.org/index.php?topic=5173537.0