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Subject: Re: [bitcoin-dev] Witness script validation to reject arbitrary data
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> Is there a reason such a validation check is a bad idea? We already have=
 OP_RETURN to store arbitrary data that is limited to 80kb.


A reason to not ban storing arbitrary/non-functional data is that people w=
ill still want to store things, so will start (ab)using useful data to do =
so, which is worse -- see Stamps[1], which stores Inscription-like data in=
 fake outputs that consume UTXO set storage (using the Counterparty spec I=
IRC).

The UTXO set getting 'too big' is a much bigger problem than the chain get=
ting bigger at closer to 4MB/10mins than the 'expected' ~1MB/10mins is (so=
me nuance/argument to be had here, though).


> Was it an oversight that arbitrary data can be inserted between OP_FALSE=
 and OP_IF when the size limit for witness scripts=C2=A0was lifted as part=
 of taproot?


Kinda? But if we want Taproot to enable large useful scripts, it's probabl=
y hard/impossible to have an undefeatable definition of 'not useful' to th=
en filter out. You could say "scripts must not have any unreachable code (=
dead code)" but then it'd be easy to come up with Inscriptions 2.0 where t=
he code is reachable but never used, rinse and repeat in a game of whack-a=
-mole.

In my opinion, it'd be wise to not incentivize people to do something wors=
e by attempting to censor what they're currently doing, given that it coul=
d be a fair bit worse!

[1]: https://github.com/mikeinspace/stamps/blob/main/BitcoinStamps.md

Angus
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