I think people will be very reluctant to give up testnet3, including myself. I've been running a testnet3 faucet for 10 years, distributing 327197.44 tBTC via the faucet + a few thousand outside the faucet. Resetting the testnet will mean the end for my faucet because I won't be mining new coins anymore. People who have testnet3 will have to find a new way to obtain testnet4. Are there any official rules for when a testnet reset will occur? If I understand correctly, it's being considered because of the "price" and the low mining reward? When testnet4 launches and starts trading in a month, will testnet5 be launched shortly after...? I would focus more on how to keep it invaluable and easily accessible to developers. I would definitely leave the transitional phase for at least a year, and the BTC client should have parameters for both -testnet3 and -testnet4. Personally, *I think the adoption of testnet4 will be very slow*. Dátum: utorok 2. apríla 2024, čas: 14:00:40 UTC+2, odosielateľ: Jameson Lopp > I think Andrew's difficulty rule suggestions are the least invasive and > make sense for fixing the block storm issue while keeping the code changes > to the logic that is already conditional to testnet. Though even with those > rules I think it would still be possible, though far less likely, for the > difficulty to get permanently reset very low unless we also implement the > difficulty adjustment patch Fabian mentioned. > > I suspect that creating a "fair" faucet is an unsolvable problem: the only > robust way to gate free giveaways (much like airdrops) is to impose an > economic cost on claiming them, which is against the spirit of testnet. > > As emsit and I both noted, 13 years without a reset means that it would be > courteous to give testnet operators a reasonably long heads up to prepare. > Perhaps 6 months or 1 year lead time? > > On Mon, Apr 1, 2024 at 6:06 PM 'Fabian' via Bitcoin Development Mailing > List wrote: > >> Hi, >> >> removing the special rule and moving to a reduced block interval sounds >> like a good and simple solution. >> >> Another idea: Keep the current exception logic and adapt the difficulty >> adjustment code (`CalculateNextWorkRequired`) to look for the last block >> that didn't have difficulty 1 and use that block's difficulty as the basis >> for the new difficulty calculation. It seemed like the most intuitive fix >> to me when I looked at the code after reading Jameson's first email (see >> https://github.com/bitcoin/bitcoin/pull/29775/commits/9913549637706749f0af5d326f949bd652cbd5f8 >> ). >> >> Best, >> Fabian >> >> >> >> On Monday, April 1st, 2024 at 4:20 PM, Andrew Poelstra < >> apoe...@wpsoftware.net> wrote: >> >> > On Mon, Apr 01, 2024 at 01:37:59PM +0000, Pieter Wuille wrote: >> > >> > > As for using other measures to prevent too large difficulty >> variations... I'm not sure that's desirable, because it always cuts both >> ways (nicely demonstrated by the "allow difficulty 1 rule" on testnet3 >> backfiring and enabling block storms!). For applications that actually need >> very predictable block rate, there is signet. For others, just the normal >> mainnet rules are probably not too terrible. I would be ok with having a >> somewhat reduced block interval (say a few days instead of 2 weeks) if >> that's not deemed to complex to implement across the ecosystem, but I don't >> think it's that important. >> > >> > >> > I really like this. For my part (rust-bitcoin) this would be as simple >> > as adding an extra parameter to my blockparams structure. Possibly one >> > already exists, I'd have to check. >> > >> > This would be much easier than the existing situation where we have >> > special-case logic for testnet the difficulty-1 target. >> > >> > It would also limit the amount of bikeshedding possible, since there >> > aren't too many conflicting goals regarding the retargeting window... >> > unlike tweaking the existing logic where there's a tradeoff between >> > "we should make this never happen" and "it should happen often enough >> > that it doesn't break people's code" and "it should happen if blocks >> > slow down to like, 1/50th their normal rate even if they are still >> > technically being produced" and "it shouldn't be possible to trigger >> > it within the 2-hour timestamp-faking window" etc. And questions >> > about whether we should fix/redesign the interaction between the reset >> > rule and the normal difficulty retarget. >> > >> > >> > OTOH, since we already have the special logic, I'd also be happy with >> > tweaking the existing rule. My specific proposal (after reading >> Jameson's >> > post, which has some nice graphs of difficulty) would be >> > >> > * increase the reset threshold from 20 minutes to 6 hours, which is >> > (a) well outside the 2-hour window in which miners can easily fake >> > timestamps, and (b) will basically never be hit by accident >> > * increase the reset difficulty from 1 to 1MM, which is an rough lower >> > bound on the "normal" testnet difficulty seen historically >> > >> > Which puts us in the "this rule would never be triggered unless >> > literally everyone stopped mining" corner of the design space. >> > >> > >> > -- >> > Andrew Poelstra >> > Director of Research, Blockstream >> > Email: apoelstra at wpsoftware.net >> > Web: https://www.wpsoftware.net/andrew >> > >> > The sun is always shining in space >> > -Justin Lewis-Webster >> > >> > -- >> > You received this message because you are subscribed to the Google >> Groups "Bitcoin Development Mailing List" group. >> > To unsubscribe from this group and stop receiving emails from it, send >> an email to bitcoindev+...@googlegroups.com. >> > To view this discussion on the web visit >> https://groups.google.com/d/msgid/bitcoindev/ZgrCxWxMkiAt2Tg2%40camus. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Bitcoin Development Mailing List" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to bitcoindev+...@googlegroups.com. >> > To view this discussion on the web visit >> https://groups.google.com/d/msgid/bitcoindev/06oL-GctrcLb99M_RuOgygXKMjtB_vPLHOCuc-axYrGVy_QBRGPu5wA9C2QXDb7cKIJbJu_t_JKmRrr9FsBORdUPavXPFvOi98p04UQuvuE%3D%40protonmail.com >> . >> > -- You received this message because you are subscribed to the Google Groups "Bitcoin Development Mailing List" group. 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