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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<maaku> Anyone want to steelman me a reason testnet shouldn't make all outputs anyone-can-spend after, say, 13104 blocks (3 months)?
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<nsh> . o O { steelman? }
<kanzure> nsh: anti-strawman
<nsh> right
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<jlopp> I'm trying to better understand the purpose and future use of checkpoints in Bitcoin. My understanding is that the checkpoints are in place in order to prevent attackers from spamming nodes with low PoW block headers starting from genesis. And that a side effect of checkpoints is a performance speedup in initial block download due to skipping signature verification.
<jlopp> Though I thought I recalled hearing that since libsecp256k1 drastically increases signature validation performance, the speedup is negligible now. I also thought I heard that long term checkpoints should be removed - is there any work being done to this end?
<instagibbs> jlopp, that is actually on topic for #bitcoin-core-dev I think, if you don't get a good answer hre
<instagibbs> That said, I think the answer to that is "people still want to remove them and it's probably ok to". Just not much of a priority because checkpoints haven't been updated for like 2 years
<jlopp> Am I correct in stating that it wouldn't be possible to feed any alternative chain of blocks to a full node if that alternative chain's starting point was prior to block 295000? It's also not clear to me why there are 13 checkpoints rather than just the last one at 295000
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<jlopp> back in 2013, gmax said "When headers first syncing is merged, just by adding a "must be this tall" minimum sum difficulty check we'll be able to remove checkpoints for all DOS purposes, and we'll also be able to remove them for syncing acceleration (using random sampling for ECDSA in the deeply burried chain)."
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<jlopp> seems like sipa also thought headers-first sync would enable removal of checkpoints... https://bitcoin.stackexchange.com/questions/7826/what-alternatives-are-there-to-hardcoding-checkpoints-into-the-bitcoin-client
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<instagibbs> it's clearly a necessary condition, yeah
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