nostr:npub1qtvl2em0llpnnllffhat8zltugwwz97x79gfmxfz4qk52n6zpk3qq87dze banning tx0 (transaction zero) and not coinjoin tx, because op_return is not part of coinjoin but rather tx0. 46 vs oceans 42bytes

And transaction zero is what requires in zerolink protocol.

And zerolink protocol breaks all these parameters: deterministic links, unmixed change, mixing with the same participants, mixing with yourself.

Therefore ban is very targeted attack it is even worse because without tx0 one cannot enter whirlpool (coinjoin) and therefore banning a conjoin after all.