wumpus changed the topic of #bitcoin-wizards to: This channel is 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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<crescendo>
in the construction of a schnorr signature, is it not possible to extend the number of total (or required) participants?
<gmaxwell>
it's not clear what you're thinking.
<gmaxwell>
(to me)
<nsh>
maybe: does an implementation incur an upper limit to m or n in schnorr m-of-n signature schemes, or can you make an implementation where either can be arbitrarily high?
<crescendo>
can we change m or n after an m-of-n schnorr agreement is constructed without requiring another round of key exchange?
<crescendo>
ah, yes, nsh thanks
<nsh>
oh, after construction would be a harder ask i'd guess
<waxwing>
crescendo: the paper i linked above treats that more like an attack than a feature :)
<crescendo>
yeah, reading through it now – perhaps there is an out-of-band protocol to be defined about an existing construction forming consensus on adding a new n, then reconstructing
<gmaxwell>
in a plain schnorr threshold signature to change the threshold you'd need to reshare the key.
<gmaxwell>
(either start over completely, or do an MPC protocol that regenerates shares)
<gmaxwell>
there are other schnorr threshold signature schemes where the threshold could just be changed by twiddling the pubkey, however.
<crescendo>
such as? also, MPC protocol?
<gmaxwell>
e.g. the polysig scheme I described allows selecting the policy by modifying the pubkey.