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From: Jonas Nick <jonasdnick@gmail.com>
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Subject: Re: [bitcoin-dev] Blinded 2-party Musig2
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> Party 1 never learns the final value of (R,s1+s2) or m.
Actually, it seems like a blinding step is missing. Assume the server (party 1)
received some c during the signature protocol. Can't the server scan the
blockchain for signatures, compute corresponding hashes c' = H(R||X||m) as in
signature verification and then check c == c'? If true, then the server has the
preimage for the c received from the client, including m.
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