andytoshi changed the topic of #bitcoin-wizards to: This channel is for discussing theoretical ideas with regard to cryptocurrencies, not about short-term Bitcoin development | This channel is logged. | For logs and more information, visit https://bitcoin.ninja
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<tromp>
what is the typical size of a 2-input 2-output tx on bitcoin Liquid?
<tromp>
explorer seems to show that such a tx increases blocksize from 1.6KB to 10.8KB. how could such a tx take over 9KB?
<tromp>
are they not using BulletProofs?
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<andytoshi>
tromp: no, they are not using bulletproofs
<andytoshi>
the BP code never actually got sufficient review to be merged into secp-zkp, despite grin taking the open PR and deploying it
<andytoshi>
we've since rewritten all of that code
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<andytoshi>
BPs are a technically simple upgrade but they are a hardfork and have a pretty high coordination cost, and we've had other priorities wrt what we ask the federation to do
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<tromp>
i guess the upgrade would be to BP+ rather than BP
<andytoshi>
it might be, i still haven't read BP+ :)
<andytoshi>
to save the extra 80 bytes or so, for liquid it would need to avoid making any tradeoffs against ease of implementation in hardware, etc., because in liquid we're really pretty fast and loose with blockspace
<andytoshi>
e.g. we currently use the old-school rangeproof's encrypted message sidechannel to pass data between transactors, post-bulletproofs we'll just add an extra transaction field for this, which has no consensus meaning and is completely gratiutious to the blockchain's function
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<andytoshi>
(another reason this update is complicated for us is that i need to rethink how this encryption is negotiated, e.g. to make the story for recovering from backups easier, even in a future world where people move this kinda crap offchain)