Replying to Avatar jb55

your node stores whatever ends up in a block. If you don’t want CSAM on your disk then run a pruned node or don’t run bitcoin at all.

even if its not in a flat contiguous format (op_return) you will still be able to recover images with a line of bash when it gets in your utxo set, like the bitcoin whitepaper.

This you can’t prune and can be done without op_return.

my take: you can’t stop it, adversarial actors will do it to attack bitcoin, stop giving them ideas.

good luck!
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Sly Fawkes 4mo ago

You seem to know a lot about recovering CSAM from the UTXO set. I'm not interested in doing that myself personally. I just want to know if it is technically possible to exclusively prune op_return data

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jb55 4mo ago

I’m actually not aware of any script that does that, its not something that any sane bitcoiner would share. I only have done it with the whitepaper.

op_returns aren’t stored in the utxo set by design. So if you have a pruned node it won’t keep it around. but you might still have it in the utxoset somewhere else if there is some not stored in op_return.

an attacker likely would store them in the utxoset just to fuck with bitcoiners, not op_return