#bitcoin-wizards on 2016-06-08 — irc logs at freenode.irclog.whitequark.org

2015-10-30 00:53 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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14:05 <instagibbs> http://www.falcon-net.org/papers/falcon-retreat-2016-05-17.pdf

14:05 <instagibbs> kanzure, do we have links on this ^ ?

14:05 Starduster_ is now known as Starduster

14:06 <instagibbs> saw a weird version string on a node, found this via googling

14:07 <kanzure> nope i have nothing

14:09 <bsm117532> You've used that word again "trust". I do not think it means what you think it means.

14:09 <bsm117532> http://www.falcon-net.org/

14:10 <instagibbs> oh wow, a schnazzy website

14:10 <waxwing> looking at that makes me wonder who is the predator and who the prey

14:11 <instagibbs> the FBRN has upgraded to a new version using UDP/FEC, wonder if it's still "orthogonal"

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14:22 <instagibbs> their latency stats for their test network don't look amazing, but I'm not exactly an expert.

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16:09 <adam3us> worm-hole routing is their main claim.

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16:10 <sipa> when bandwidth is the limiting factor, using cut-through routing is certainly faster than the naive p2p pblock propagation bitcoin uses

16:10 <sipa> unsure to what extent it will matter after bip152

16:11 <bsm1175321> It's still a better network topology than Bitcoin's random one, so will likely still be an advantage even with BIP152.

16:12 <sipa> right, but that's due to the fact that it is a curated network, not the protocol

16:12 <sipa> it's more a competitor to the frbn than to bip152

16:12 <adam3us> sipa they claim advantage over FBRN

16:13 <adam3us> sipa yes

16:13 <sipa> they could even incorporate the relay network protocol in their system

16:15 <adam3us> but i suppose it is relevant in the sense that the push to narrow the gap between latency optimised curated miner networks and bitcoin p2p network wormhole routing could be useful.

16:15 <adam3us> fec and multi-source packet streaming might get the effect indirectly anyway though.

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16:16 <sipa> to be clear, despite using the word 'competitor' i don't mean that i consider it a bad idea

16:16 <adam3us> even a good thing for diversity

16:16 <sipa> it's something we've wanted to do in bitcoin p2p for years afaik, but it's extremely hard to do in the networking code (and would be hard to prevent denial of service attacks)

16:17 <sipa> i guess you'd split up blocks in small packets of a few kB each maybe, and give a partial merkle root for each

16:17 <sipa> so they can all individually be verified

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16:26 <instagibbs> I'd like to see the delta between their claimed benefits and just compression/reduce RTT strategies in bip152

16:26 <instagibbs> Though I'm guessing it's just "how long it takes to fully validate a block" per hop

16:27 <runeks> Can anyone explain why Bitcoin Core refuses to accept this transaction, saying "64: non-mandatory-script-verify-flag (Locktime requirement not satisfied)"?

16:27 <runeks> 0100000001056ab32aea70e55bb8b1e783c462df21ddc90409741b077591dfce87d8425cb0010000009b4730440220310f6d27466dfe2bd365c4b0a9fc78305f83679b08f98ed11368c790143c7f4b022005471fe3770ec5191e0ee44568292788a35e972bea935a8ddd928c2477ac201201004c50632103b5ad36dca793edf4664cd51b4d3fb41d35d0bd92c60f62ed08b2b55fdb2c5a6dad67048c7b5757b1756821038ea27103fb646a2cea9eca9080737e0b

16:27 <runeks> 23640caaaef2853416c9b286b353313eacffffffff01905f0100000000001976a91475d715f9a84555e752772c9ad62be90b3b7bb88a88ac00000000

16:28 <runeks> Perhaps I should have pastebinned that...: http://pastebin.com/QbdBa4th

16:28 <runeks> I've decoded the lockTime in the script to 1465351052 by hand, which should be more than 12 hours ago.

16:29 <runeks> The redeemScript looks like this (copied from CHECKLOCKTIMEVERIFY BIP): http://pastebin.com/ckmC9iCC

16:30 <sipa> did you also set nLockTime itself correctly?

16:30 <runeks> sipa: The transaction itself has lockTime 0 and sequence 0xffffffff

16:30 <runeks> sipa: Should I be doing that differently?

16:30 <instagibbs> nlocktime must be set to at(or above?) the value in the redeemscript

16:31 <runeks> Oh...

16:31 <instagibbs> CLTV is literally checking nlocktime

16:31 <instagibbs> not the block height

16:31 <sipa> runeks: CLTV tests the *nLockTime* value, not the block time

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16:32 <runeks> sipa: I don't understand. The lockTime I want checked is pushed onto the stack before executing OP_CHECKLOCKTIMEVERIFY, no?

16:33 <runeks> This is the redeemScript: http://pastebin.com/ckmC9iCC

16:33 <sipa> runeks: yes, and OP_CHECKLOCKTIMEVERIFY compares that value on the stack with the spending transaction's tx.nLockTime

16:33 <runeks> sipa: Ok. So the spending transaction's lockTime must be equal to or greater than the lockTime in the script?

16:34 <sipa> read the bip

16:34 <runeks> sipa: Fair enough

16:38 <instagibbs> haha, I guess I accidentally found the Falcon Relay before public announcement :)

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