sipa changed the topic of #bitcoin-wizards to: This channel is for discussing theoretical ideas with regard to cryptocurrencies, not about short-term Bitcoin development | http://bitcoin.ninja/ | This channel is logged. | For logs and more information, visit http://bitcoin.ninja
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<phwalkr> Good day! The bitcoin.it wiki says about "disable" opcode: "If any opcode marked as disabled is present in a script - it must also abort and fail." I wonder why do we need it and when to use it
<phwalkr> By all means, it seems that I can just use OP_RETURN instead
<queip> phwalkr: uh? it's a consensus rule to remove usage of very old, and no longer supported opcodes?
<queip> to make their spending invalid
<queip> *usage
<phwalkr> queip: hm, but why were disabled opcodes obsolete?
<queip> it was decided to no longer allow them, afair for security reasons, or perhaps also to disencourage writting certain kinds of smart contracts(?)
<queip> I would guess to disencourage using bitcoin as worlds computer or other such things, and focus on money with minimal scripting as needed to protect access to money. But someone involved in this decissions should comment better
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<harding> They were disabled as part of the response to the value overflow issue: https://en.bitcoin.it/wiki/Value_overflow_incident and https://github.com/bitcoin/bitcoin/commit/4bd188c4383d6e614e18f79dc337fbabe8464c82#diff-8458adcedc17d046942185cb709ff5c3R94 . AFAIK, Nakamoto never explicitly said why he disabled them, but the general belief is that he was afraid that their use of BigNum could be abused to create problems similar to the
<harding> overflow issue. I believe ElementsProject.org has had someone review their code and re-enabled them for any sidechains using that codebase.
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<queip> harding: I mean, we obviously could bring them back, fixing few such opcodes is no rocket science\
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<harding> Sure. I think some people are hoping to get at least a few of them back in a future soft fork using taproot's OP_SUCCESSx opcodes.
<phwalkr> queip and harding: Thank you for the information!
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<kanzure> "Indistinguishability obfuscation from well-founded assumptions" https://eprint.iacr.org/2020/1003
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