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From: Tom Trevethan <tom@commerceblock.com>
To: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: [bitcoin-dev]  Blinded 2-party Musig2
Date: Wed, 26 Jul 2023 17:32:06 +0100	[thread overview]
Message-ID: <CAJvkSsft_z6s90oVnewmFU66hiURDHSvmGdmQETVJOW1C1xEyQ@mail.gmail.com> (raw)
In-Reply-To: <mailman.125690.1690381971.956.bitcoin-dev@lists.linuxfoundation.org>

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@moonsettler

Your scheme for blinding the challenge (e in your notation) works as far as
I can tell. It is better than the way I suggested as it doesn't require
modifying the aggregated pubkey (and the blinding nonce can be different
for each signature).

@AdamISZ and @Jonas

It is not necessarily the server that would need to verify that the
challenge is 'well formed', but the receiver of a statecoin. The concept of
having a blinded statechain server is that each signature generated for a
shared public key must be verified by the receiver of the corresponding
coin. So a receiver would retrieve the number of co-signings performed by
the server (K) and then verify each of the K signatures, and K transactions
that they have received from the sender. They can additionally verify that
each of the K R values has been correctly formed with a proof of secret
value for creating R2 (along with the R1 from the server).

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       reply	other threads:[~2023-07-26 16:32 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <mailman.125690.1690381971.956.bitcoin-dev@lists.linuxfoundation.org>
2023-07-26 16:32 ` Tom Trevethan [this message]
2023-07-24  7:46 [bitcoin-dev] Blinded 2-party Musig2 Tom Trevethan
2023-07-24 10:50 ` ZmnSCPxj
2023-07-24 14:25   ` Erik Aronesty
2023-07-24 16:08     ` Tom Trevethan
2023-07-24 15:57   ` Tom Trevethan
2023-07-24 14:12 ` Jonas Nick
2023-07-24 14:40   ` Erik Aronesty
2023-07-24 15:40     ` Jonas Nick
2023-07-24 16:51   ` AdamISZ
2023-07-25 14:12     ` Erik Aronesty
2023-07-25 16:05       ` Tom Trevethan
2023-07-26  4:09         ` Erik Aronesty
2023-07-26 17:40           ` Andrew Poelstra
2023-07-26 19:59           ` Jonas Nick
2023-07-26 20:35             ` Tom Trevethan
2023-07-26 22:06               ` Erik Aronesty
2023-07-27  2:54                 ` Lloyd Fournier
2023-07-27  8:07               ` Jonas Nick
     [not found]                 ` <CAJvkSsfa8rzbwXiatZBpwQ6d4d94yLQifK8gyq3k-rq_1SH4OQ@mail.gmail.com>
2023-07-27 13:25                   ` [bitcoin-dev] Fwd: " Tom Trevethan
2023-08-07  0:55                     ` [bitcoin-dev] " Tom Trevethan
2023-08-08 17:44                       ` moonsettler
2023-08-09 15:14                         ` Tom Trevethan
2023-08-10  3:30                           ` Lloyd Fournier
2023-08-10 11:59                             ` Tom Trevethan
2023-08-14  6:31                               ` Lloyd Fournier
2023-08-30 10:52                       ` Tom Trevethan
2023-07-24 15:39 ` Jonas Nick
2023-07-24 16:22   ` Tom Trevethan
2023-07-26  9:44   ` moonsettler
2023-07-26 14:59     ` Jonas Nick
2023-07-26 19:19     ` AdamISZ
2023-07-26 19:28       ` moonsettler
2023-07-27  5:51         ` AdamISZ

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