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On 9/13/2014 7:45 PM, Michael Wozniak wrote: > The biggest problem with a time based rule is that there is no > central time to provide a measure of how much time has actually > passed. You can see this issue on testnet already because block > timestamps are modified. For example, the current time is > (according to my server) 1410626564 and the best block on testnet > shows a timestamp of 1410628433 (30 minutes in the future). > > This problem can be addressed, like the problem of transaction time and order of transactions in blocks. For sure maybe you cannot get 100% time accuracy, but you can know the time with +/- some error margin for time window. And as for the other algorithms used by altcois, i don't have one to give as an example but can't all of them be unstable. And of course, it is not a problem now and most probably will never be, but if it's simple to implement why not take safety precautions and be prepared even for the unexpected / impossible threat? I mean, isn't this what cryptocoin decentralized money is all about? :) > > On Sep 13, 2014, at 12:34 PM, Jeff Garzik <jgar...@bitpay.com> > wrote: > >> Why not on mainnet? It is simply much lower priority for >> bitcoin today than other problems. It tends not to happen at >> higher difficulties for a variety of reasons. >> >> The difficulty adjustment is capped at a factor of 4, up or down, >> to address some other attacks that can happen in mining. >> >> Personally, I think there needs to be a mainnet safety rule such >> as "if 24 hours goes by without a block, you may mine a block" >> etc. But I readily admit I've not thought through all the >> ramifications of such a policy. >> >> >> >> On Sat, Sep 13, 2014 at 12:00 PM, s7r <s...@sky-ip.org> wrote: > > > On 9/13/2014 5:04 PM, Jeff Garzik wrote: >>>>> This is why testnet has a special rule: If 20 minutes >>>>> passes without a block, you may mine a diff-1 block. >>>>> > > Thanks for your point of view Mr. Garzik. Why aren't we using this > in the real bitcoin network too? If it's good for balancing the > functionality of the network in the context of sudden hashrate > moves? Specially down moves, since if the hash power goes UP, the > network will see blocks are created more often than at every 10 > minutes and adjust the difficulty directly proportional, correct? > >>>>> >>>>> On Sat, Sep 13, 2014 at 9:15 AM, s7r <s...@sky-ip.org> >>>>> wrote: Hi there, >>>>> >>>>> I have an contradictory discussion with an altcoin >>>>> supporter and want to bring some solid arguments in a >>>>> public talk, so require little help to respond to a >>>>> question with simplest answer. >>>>> >>>>> The problem is within the difficulty adjustment mechanism, >>>>> that it happens at every 2016 blocks. In case the hash >>>>> power will suddenly decrease, the 2016 blocks will take a >>>>> lot of time to solve, therefor freeze the network in a >>>>> non-operational way. I know by far this is just a joke, >>>>> because this is very unlikely to happen anytime (people >>>>> paid for mining equipment and make money) but for the sake >>>>> of discussion, let's just assume it 'could' happen. >>>>> >>>>> Can this really freeze the network for unlimited time and >>>>> bitcoin has no mechanism to balance it back? A resourceful >>>>> party with the intent to attack the network in an >>>>> irrational way, brings lot of hashing power and keeps it >>>>> for 2016 blocks, then removes it leaving the other 2016 >>>>> blocks to solve at very high difficulty but with low hash >>>>> power in the network causing a 'blackout'? Thank you in >>>>> advance for your answers. >>>>> >>>>> >>>>>> >>>>>> ------------------------------------------------------------------------------ >>>>>> >>>>>> > >>>>>> Want excitement? >>>>>> Manually upgrade your production database. When you want >>>>>> reliability, choose Perforce Perforce version control. >>>>>> Predictably reliable. >>>>>> http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.clktrk >>>>>> >>>>>> > >>>>>> _______________________________________________ >>>>>> bitcoin-list mailing list >>>>>> bitcoin-list@lists.sourceforge.net >>>>>> https://lists.sourceforge.net/lists/listinfo/bitcoin-list >>>>> >>>>> >>>>> >> >> >> >> >>>>>> - -- >> Jeff Garzik Bitcoin core developer and open source evangelist >> BitPay, Inc. https://bitpay.com/ >> >> ------------------------------------------------------------------------------ >> >> Want excitement? >> Manually upgrade your production database. When you want >> reliability, choose Perforce Perforce version control. >> Predictably reliable. >> http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.clktrk >> >> _______________________________________________ >> bitcoin-list mailing list bitcoin-list@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/bitcoin-list > > > ------------------------------------------------------------------------------ > > Want excitement? > Manually upgrade your production database. When you want > reliability, choose Perforce Perforce version control. Predictably > reliable. > http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.clktrk > > _______________________________________________ > bitcoin-list mailing list bitcoin-list@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/bitcoin-list > -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (MingW32) iQEcBAEBAgAGBQJUFIFUAAoJEIN/pSyBJlsRTsEIAJoblPgleEBE905tyw3ha9So eqbPPmfxJ2bAxFWz9f1BeLs3YbOuxzSbwOtmwGeCGg/cepIPW1z94ECLHfXR68cs 7oY1GXTj7WpSN0XXEvQ4NQcLMPqM9W4eFZoY0FWOVQGzy1M3g8JXGfK4mDC+aTD3 BSLkxfg0Q8fzd7aOObW/vqNYjnO64wK/Me/imGbjX3L24cLBuDwDTpcmXMkCsqtx 2BAZoZHBFzTwTxPH4GFJ44u1Lv0+N8C8GroZUMvXUsxo9MX2aEuFKOZ//xhymttH LqYlIaHPOnByzFBsYG/Wrp0DcQpPpbROOG2s5UP85b3FRIE1HTMx64ckTJYhFXM= =fd3u -----END PGP SIGNATURE----- ------------------------------------------------------------------------------ Want excitement? Manually upgrade your production database. When you want reliability, choose Perforce Perforce version control. Predictably reliable. http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.clktrk _______________________________________________ bitcoin-list mailing list bitcoin-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-list
