$200 dollars reward for helping me fix my issue

[LoyceV]

Anyone knowing OP's public key or hash of it can spend the coins sent to that address but the transaction will be considered non-standard and rejected by the nodes, so it needs miner's intervention.

Now that you mention it, I indeed remember reading about this years ago.

Do I get this right? For a miner, it shouldn't be too difficult to find the public key of similar addresses the moment they're sweeped on the Bitcoin chain. If the address hasn't been used yet on the Bitcoin-chain, chances are Coinbase will sweep it after it receives a deposit. It's also not that difficult to get a list of all Bitcoin Segwit addresses that accidentally received coins on the BCH-chain. I see a whole new usage case for this data!

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[o_e_l_e_o]

Do I get this right? For a miner, it shouldn't be too difficult to find the public key of similar addresses the moment they're sweeped on the Bitcoin chain.

That's right. On the BCash chain, these coins are essentially anyone can spend, with the anyone being anyone who knows the public key of that address. As soon as the equivalent BTC address makes a transaction, the BCash can be moved by any miner who chooses to do so.

Indeed, this has happened a lot in the past, with some miners redirecting the coins to their intended addresses (https://www.reddit.com/r/btc/comments/bqfzxk/psa_guide_on_how_to_recover_your_lost_segwit/) and other miners stealing the coins for themselves (https://micky.com.au/anonymous-bitcoin-cash-miner-steals-9000-bch-from-unwary-users/).

[pooya87]

Keep in mind that the miner who mines the said transaction has to be the centralized mining group that controls more than 80% of the mining power otherwise there is a good chance that they are going to reverse that block with another 51% attack just like the one they did back in 2019 right after the bcash May 15 hard fork which was a similar block containing SegWit outputs being spent by an unknown miner that wasn't part of the bcash mining cartel.