2015-07-19.log

--- Log opened Sun Jul 19 00:00:15 2015
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crescendoin the construction of a schnorr signature, is it not possible to extend the number of total (or required) participants?12:34
gmaxwellit's not clear what you're thinking.12:38
gmaxwell(to me)12:38
nshmaybe: 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?12:40
crescendocan we change m or n after an m-of-n schnorr agreement is constructed without requiring another round of key exchange?12:41
crescendoah, yes, nsh thanks12:41
nshoh, after construction would be a harder ask i'd guess12:41
waxwingcrescendo: the paper i linked above treats that more like an attack than a feature :)12:42
crescendoyeah, 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 reconstructing12:43
gmaxwellin a plain schnorr threshold signature to change the threshold you'd need to reshare the key.12:44
gmaxwell(either start over completely, or do an MPC protocol that regenerates shares)12:44
gmaxwellthere are other schnorr threshold signature schemes where the threshold could just be changed by twiddling the pubkey, however.12:45
crescendosuch as?  also, MPC protocol?12:47
gmaxwelle.g. the polysig scheme I described allows selecting the policy by modifying the pubkey.12:48
gmaxwellcrescendo: multiparty computation.12:48
nshdescribed where, gmaxwell?12:49
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gmaxwellhttp://www.meetup.com/SF-Bitcoin-Devs/events/220908687/ second segment12:53
nshty12:55
* nsh wonders about smart-contracts via polysig aggregation rather than script operations12:57
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amillerweird21:18
amillerhas anyone been puzzled by the difference between unspent-transaction-outputs like in Bitcoin, and "accounts" like in Ethereum?21:19
amillerit's just a minor data structure difference, so it seems like it shouldn't matter one way or the other21:19
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amillerprobably everyone will work out that there might be a utxo storage savings to have with ethereum-style account balances if addresses are reused a lot, and in bitcoin we're supposed to encourage fresh addresses mostly21:20
amillerhere's the new weird observation - the bitcoin transaction graph data structure would be well suited to an even weaker asynchronous network where transactions we're even totally ordered in blocks21:21
gmaxwellamiller: "zomg use accounts" is a common ignorant newbie mistake; missing e.g. the requirement to avoid replay vulnerablity; once you engineer in the replay immunity and the ability to selectively conflict inputs, and privacy then they're very close.21:21
gmaxwellWeren't even totally ordered in blocks? indeed-- well if not for double spending bitcoin would work fine without the blockchain at all. :)21:22
amillerthere are some well studied traditional (e.g., a PKI and fixed set of N nodes) asynchronous protocols for 'multi-valued consensus' that could gurantee eventual global agreement on how each transaction output gets spent21:23
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amiller*but*, if there are two possible conflicting transactions propagating around, it is possible that the utxo gets marked with a default/unspendable value rather than a transaction21:23
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