sipa changed the topic of #bitcoin-wizards to: This channel 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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<SatoshiMcGee> hello all
<SatoshiMcGee> s
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<kallewoof> I've been working on a proposal for an anti-DoS feature using proof of work for Bitcoin nodes. Feedback very welcome: https://github.com/kallewoof/bips/blob/pow-connection-slots/bip-rate-limiting-via-pow.mediawiki
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<gmaxwell> tromp: ^
<gmaxwell> kallewoof: neat.
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<fluffypony> kallewoof: we've been doing the same in Monero, using Cuckoo Cycle, but the idea was to PoW-handshake-challenge every inbound connection; I'm interested in why you approached it as an only-challenge-above-threshold
<fluffypony> (unless I'm misreading the spec)
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<kallewoof> fluffypony: You mean why have free POW slots at all? It felt sensible, as this is primarily meant to prevent slot exhaustion, but a user could set pow connection slots = max connections to get POW req for all.
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<kallewoof> s/free POW slots/free connection slots/
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<fluffypony> I wonder if there are any stats as to how often reconnections happen
<fluffypony> and whether our approach would lead to a degradation of the network
<kallewoof> I haven't seen any stats, myself, but I'd be interested to see it.
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<tromp__> nice to see cuckoo in use!
<tromp__> btw, i had to pay out a cuckoo cycle speedup bounty in the past few days
<tromp__> it turns out to be possible to avoid the high latency memory accesses by using 20x more memory
<tromp__> for large instances, this gives a speedup of more than 4x
<tromp__> for size 2^28 the speedup is about 2.8x
<Eliel> is that faster than running 20 parallel searches?
<Eliel> without the optimization
<andytoshi> tromp__: the last i looked at the parameters grin is trying to use, they want something like one minute blocks which required a pretty small nominal memory requirement
<tromp__> yes
<andytoshi> where 20x is perfectly reasonable for a desktop machine to have
<andytoshi> does this seriously impair cuckoo cycle for those parameters? (it could also be i don't remember the parameters they want)
<midnightmagic> tromp__: Have you detailed this somewhere linkable?
<tromp__> it's reported on https://github.com/tromp/cuckoo
<midnightmagic> tromp__: Thanks
<tromp__> there's a big uncertainty now about gpu performance of cuckoo cycle
<tromp__> for zcash' equihash we see a huge performance gap between open source and closed source miners
<tromp__> and the new solver for cuckoo cycle is bottlenecked by bucket sorting just like equihash is
<tromp__> with a long enough block interval, one could make the size so big that GPUs don't have enough memory for the low latency solver
<andytoshi> i would prefer long block intervals in grin to give time for aggregation for privacy reasons, but i think i'm in a minority there (and i hate debating parameters like this, it feels so bikesheddy :))
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<tromp__> of course i would love long times to make cuckoo a real memory hog
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<tromp__> the bip above incorrectly mentions "41 values which identify each of the 41 edges in the cycle"
<tromp__> you need to identify all 42 edges
<tromp__> i was thinking of changing the notion of size in cuckoo cycle
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<tromp__> to make it the number of edges rather than total number of nodes
<tromp__> becayse it's easier to think about a bipartite graph with N+N nodes and N edges
<tromp__> i asked xenoncat to provide a version of his low-latency solver for size 2^20 (unlike my solver, he needs to tweak many parameters for each different size)
<tromp__> fluffypony: where is rate limiting code in monero?
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<fluffypony> tromp__: doesn't exist yet - write-up first, then code :)
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<tromp__> that's what i thought, but you spoke in definitive terms "kallewoof: we've been doing the same in Monero, using Cuckoo Cycle"
<tromp__> so the doing there refers to the planning:)
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<fluffypony> aaah - yeah, I should've clarified what "doing" means :)
* nsh only ever imagines doing things to avoid this ambiguity :)
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<andytoshi> oleganza: lol, i unsubscribed from tor-dev this morning because i never read the messages, and then you go and start a conversation that i care about!
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<kanzure> .title
<yoleaux> [tor-dev] Interest in collaborating on a standard Ed25519 key blinding scheme?
<bsm117532> Nice job guys, workin' together!
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<oleganza> andytoshi: how did you find my msg if you unsubscribed? :)
<andytoshi> oleganza: i think it came into my staging inbox before i unsubscribed, and didn't see it until i processed my email later
<andytoshi> alternatively, i failed to unsubscribe somehow
<andytoshi> ah, yes, i don't think i ever got any email with which to confirm the unsubscription. i had this problem before, i have no idea how to get off of the list
<oleganza> do you want to join my network on linkedin?
<andytoshi> hahah
<oleganza> it's one-wayness is better than keccak
<oleganza> s/it's/its/
<andytoshi> lol
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<isis> weird sister, one of us, one of us
<isis> the unsubscribe command is a lie
<isis> andytoshi: in all seriousness, if you actually want to be removed from one of our lists, we can probably manage that :)
<isis> err, not that i think you should go away, to be clear
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<andytoshi> isis: thanks! understood, i'll pm you
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