<n​obfg9000:matrix.org> hey i have a question about FCMPs. could it prevent users from storing arbitrary data in the transaction format? I remember that was an issue around the discussion of removing tx_extra in the whole mordinals situation, because the mordinals dev claimed they could just stuff their data in the outputs

<n​obfg9000:matrix.org> there was a big discussion on github around removing tx_extra last year and I think it ended talking about whether or not you could check to see if decoys were really decoys

<n​obfg9000:matrix.org> monero-project/monero #6668

<n​obfg9000:matrix.org> This would be nice because it would allow controlling how much arbitrary data can be pushed on the chain (possibly allow some tradeoff wherein you can push arbitary non-transaction data, but it incurs extra fees)

<j​0j0xmr:monero.social> There seems to be political reasons to keep tx_extra, prioritizing projects that currently use it over the fungibility of the protocol.

As has been discussed 100 times before, there are many other other ways to insert fingerprinting information besides tx_extra. Removing tx_extra by itself does not fix fingerprinting issues

It's not an "either or" situation here, and not political

We also use tx_extra for addressing information, so if we removed tx_extra, you wouldn't be able to use cryptonote addresses. We could try enforcing the contents of tx_extra to ONLY have addressing information, but now we're back at the same problem: how can an external observer prove that any stored crypto primitive anywhere in the tx isn't encoding additional information? Short answer: you can't