CORRECTION: That's Paul Sztorc. Not Peter.  Apologies for my abysmal proofreading. -- MC On Tue, Aug 4, 2015 at 8:08 PM -0700, "Eric Lombrozo via bitcoin-dev" wrote: Rather than speculating on fake markets, why don’t we use theory, empirical data, and engineering to fix the damn problems? On Aug 4, 2015, at 11:28 AM, Owen via bitcoin-dev wrote: Given there is no money at stake in these prediction games, it is no surprise that the results are implausible. On August 4, 2015 10:22:19 AM EDT, Anthony Towns via bitcoin-dev wrote: On 4 August 2015 at 01:22, Gavin Andresen via bitcoin-dev wrote: And the preliminary results of using a prediction market to try to wrestle with the tough tradeoffs looks roughly correct to me, too:   https://blocksizedebate.com/ ​The scicast prediction market is shutdown atm (since early July?) so those numbers aren't live. But... Network hash rate 3,255.17 PH/s  (same block size) 5,032.64 PH/s  (block size increase) 4,969.68 PH/s  (no replace-by-fee) 3,132.09 PH/s  (replace-by-fee) Those numbers seem completely implausible: that's ~2.9-3.6 doublings of the current hashrate (< 400PH/s) in 17 months, when it's taken 12 months for the last doubling, and there's a block reward reduction due in that period too. (That might've been a reasonable prediction sometime in the past year, when doublings were slowing from once every ~45 days to once a year; it just doesn't seem a supportable prediction now) That the PH/s rate is higher with bigger blocks is surprising, but given that site also predicts USD/BTC will be $280 with no change but $555 with bigger blocks, so I assume that difference is mostly due to price. Also, 12.5btc at $555 each is about 23 btc at $300 each, so if that price increase is realistic, it would compensate for almost all of the block reward reduction. Daily transaction volume 168,438.22 tx/day  (same block size) 193,773.08 tx/day  (block size increase) 192,603.80 tx/day  (no replace-by-fee) 168,406.73 tx/day  (replace-by-fee) That's only a 15% increase in transaction volume due to the block size increase; I would have expected more? 168k-194k tx/day is also only a 30%-50% increase in transaction volume from 130k tx/day currently. If that's really the case, then a 1.5MB-2MB max block size would probably be enough for the next two years... (Predicting that the node count will drop from ~5000 to ~1200 due to increasing block sizes seems quite an indictment as far as centralisation risks go; but given I'm not that convinced by the other predictions, I'm not sure I want to give that much weight to that one either) Cheers,aj -- Anthony Towns bitcoin-dev mailing list bitcoin-dev@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev _______________________________________________ bitcoin-dev mailing list bitcoin-dev@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev