From: "'Fabian' via Bitcoin Development Mailing List" <bitcoindev@googlegroups.com>
To: Andrew Poelstra <apoelstra@wpsoftware•net>
Cc: bitcoindev@googlegroups.com
Subject: Re: [bitcoindev] The Future of Bitcoin Testnet
Date: Mon, 01 Apr 2024 22:01:35 +0000 [thread overview]
Message-ID: <06oL-GctrcLb99M_RuOgygXKMjtB_vPLHOCuc-axYrGVy_QBRGPu5wA9C2QXDb7cKIJbJu_t_JKmRrr9FsBORdUPavXPFvOi98p04UQuvuE=@protonmail.com> (raw)
In-Reply-To: <ZgrCxWxMkiAt2Tg2@camus>
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 <apoelstra@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
>
> --
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next prev parent reply other threads:[~2024-04-01 22:06 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-31 13:19 Jameson Lopp
2024-03-31 14:33 ` Luke Dashjr
2024-03-31 14:57 ` Jameson Lopp
2024-03-31 17:21 ` Eric Voskuil
2024-04-09 18:28 ` Garlo Nicon
2024-03-31 16:02 ` Peter Todd
2024-03-31 21:01 ` Nagaev Boris
2024-03-31 21:29 ` Peter Todd
2024-04-01 12:54 ` Jameson Lopp
2024-04-01 13:37 ` Pieter Wuille
2024-04-01 14:20 ` Andrew Poelstra
2024-04-01 22:01 ` 'Fabian' via Bitcoin Development Mailing List [this message]
2024-04-02 11:53 ` Jameson Lopp
2024-04-02 18:36 ` Lukáš Kráľ
2024-04-02 19:46 ` Jameson Lopp
2024-04-03 4:19 ` Anthony Towns
2024-04-03 18:18 ` emsit
2024-04-03 19:35 ` Andrew Poelstra
2024-04-30 18:46 ` Matthew Bagazinski
2024-05-01 15:30 ` Garlo Nicon
2024-05-04 17:13 ` Peter Todd
2024-04-10 6:57 ` Garlo Nicon
2024-04-22 4:33 ` Ali Sherief
2024-04-01 13:25 ` Andrew Poelstra
2024-04-01 13:32 ` 'Fabian' via Bitcoin Development Mailing List
2024-04-01 14:28 ` Warren Togami
2024-04-01 19:22 ` [bitcoindev] " emsit
2024-04-04 8:14 ` Calvin Kim
2024-04-04 12:47 ` Jameson Lopp
2024-04-05 4:30 ` Calvin Kim
2024-04-06 23:04 ` David A. Harding
2024-04-09 16:48 ` Peter Todd
2024-04-16 17:30 ` [bitcoindev] " 'Sjors Provoost' via Bitcoin Development Mailing List
2024-04-07 7:20 ` [bitcoindev] " Christian Decker
2024-04-07 8:09 ` K Calvin
2024-04-08 19:11 ` Garlo Nicon
2024-04-09 4:29 ` coinableS
2024-04-28 13:45 ` [bitcoindev] " Matt Corallo
2024-05-02 7:10 ` Ali Sherief
2024-05-04 17:08 ` Peter Todd
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