#bitcoin-wizards on 2018-09-04 — irc logs at freenode.irclog.whitequark.org

2015-10-30 00:53 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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21:10 <ECH> maaku: So what's the point of the ecdh nonce in the confidential transaction if the amount is obfuscated in the pedersen commitment and the Confidential Transaction Address is in the scriptPubKey?

21:21 <ECH> is it used to verify the pedersen commitment?

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21:24 <sipa> ECH: it's there to communicate encrypted data to the receiver of the transaction

21:24 <sipa> (which could also just be communicated out of band)

21:25 <ECH> Which he needs to decrypt the confidential transaction?

21:25 <sipa> so he can learn the amount and blinding factor

21:25 <ECH> got it

21:25 <ECH> ty vm

21:25 <sipa> in particular, a CT output can't be spent without knowing the blinding factor

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23:21 <maaku> there's no consensus reason for the nonce to be in the transaction

23:21 <maaku> but otherwise you'd need an out of band communication mechanism and it'd be total chaos

23:22 <maaku> (use of the nonce should be optional though in any sane implementation)

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