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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<tromp_>
apologies if i asked this before and forgot:( given a bulletproof rangeproof for commitment C=r\*G+v\*H, does one need knowledge of r to make a rangeproof for C+G ?
<sipa>
well arguably you could just tell the verifier "subtract G, and here is a rangeproof for the result"
<sipa>
that would be a valid rangeproof :p
<sipa>
(i know that's not what you mean, and i don't know the answer if the result needs to be a pure standalone bulletproof)
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<tromp_>
yes, i'm asking if you could mess with other people's utxo's in MW by transacting to tweak their blinding factors
<tromp_>
obviously, you can sign for the excess, but can you tweak the rangeproofs?
<nsh>
tromp_, ask perhaps in #monero-research-lounge
<tromp_>
i unfortunately don't understand bulletproofs well enough to answer
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<sarang>
You can't modify a bulletproof for a commitment into another bulletproof for a different commitment in that way, if I'm understanding your particular requirements
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<tromp_>
thx, sarang. happy to hear that
<sarang>
A valid proof is an assurance that the prover knew the value and mask for the commitment
<sarang>
Generating a valid proof without those would break soundness
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