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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<CubicEarth>
is this channel used anymore?
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<buZz>
doesnt look like it
<CubicEarth>
yet here we are
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<bsm117532>
I can't get this paper out of my head: https://eprint.iacr.org/2011/553.pdf ("Publicly Verifiable Proofs of Sequential Work") -- which comes down to composed hashes (hash of a hash of a hash of a...) and proving sequential work by putting a Merkle tree on it, and a set of challenges in ZKP via Fiat-Shamir.
<bsm117532>
I want to measure network topology and latencies, in a cryptographically provable manner, using this. That is, imagine every node has one core devoted to this computation. When it receives a message, it looks at the latest hash and inputs some data from the received message. The next message it receives it can provide a proof of elapsed time between the two messages.
<bsm117532>
This is a lower bound for obvious reasons, and must be calibrated relative to other nodes.
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<bsm117532>
This could have a better (faster) measure of time than Bitcoin, without trusted-clock vulnerabilities, and eliminate the energy consumption due to embarrassingly parallelization of Bitcoin's PoW, since this algorithm is non-parallelizable -- it would ensure one miner = one node.
<nsh>
bitcoin PoW's parallelizability gives it progress-freeness, which is essential to convergence. one there is a cost to abandoning progress in light of new transactions then the incentive to mine the verymostcurrent mempool is undermined and the coupling between economic incentive and byzantine tolerance gets loose
<nsh>
oh, and progress-freeness also counters mining centralisation pressure
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<bsm117532>
nsh: Sequential work can be progress free too. A sequence of hash-of-hash-of-... can be simultaneously measuring multiple things, where whenever I receive a time point I want to measure, I insert it into the sequence...h(h(H|data)) where H is the last hash and "data" is some new incoming data at time t.