Amazing.

Bitcoin Miner AntPool to Refund Record $3M BTC Transaction Fee
AntPool said it would verify the identity of the sender if they sign an on-chain message via another bitcoin transaction using the same message – which will prove ownership.

https://www.coindesk.com/tech/2023/11/30/bitcoin-miner-antpool-to-refund-record-3m-btc-transaction-fee/