--- Log opened Tue Nov 17 00:00:19 2020
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07:02 < pinheadmz> Reading up on MuSig2 and I wonder, after generating Ri1, Ri2,... in the first signing step, does that step ever need to be repeated for subsequent transactions? Or can future R values be derived deterministically similar to bip32 chains?
07:03 < zmnscpxj__> Does that save on operations?
07:03 < pinheadmz> where I'm going with this is, after the first two round scheme for the first tx a group signs, can each additional tx be signed with a single round?
07:03 < pinheadmz> or does Ri1, Ri2, ... really need to be generated fresh by each party for each tx
07:03 < nickler> it would save on communication, but no
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07:04 < aj> if you do Ri1, .., RiN and create N signatures, I think that would leak your private key?
07:04 < nickler> the values need to be generated freshly but you can still sign additional txs with a single round, by sharing all R's for future txs in the very first communication step
07:04 < pinheadmz> aha super interesting
07:05 < pinheadmz> so step one is like, generate R values for the next 10,000 transactions
07:05 < nickler> or you send fresh R's for the next transaction along with the signature
07:05 < pinheadmz> Oh thats clever too yes
07:05 < pinheadmz> ok so there is a UX that feels like "legacy" multisig available here
07:06 < zmnscpxj__> except you have to store the previous `R` values
07:06 < pinheadmz> group member proposes a tx and i send one message back with enough enough to complete and broadcast
07:06 < nickler> yeah that UX is possible, but need to maintain state correctly
07:06 < pinheadmz> ah yes that is a bit extra overhead
07:07 < pinheadmz> so there is no way to generate these R's deterministally without brekaing security?
07:07 < pinheadmz> (to remove that state)
07:07 < nickler> you can remove the state with musig-dn, but then you can't pre-share the nonces before knowing the message
07:07 < nickler> we wrote about these trade-offs here https://medium.com/blockstream/musig2-simple-two-round-schnorr-multisignatures-bf9582e99295
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--- Log closed Wed Nov 18 00:00:20 2020