I only knew about ArtForz's fix, which isn't backwards compatible. https://github.com/bitcoin/bitcoin/compare/0.11...jtimon:hardfork-timewarp-0.11 https://github.com/bitcoin/bips/blob/master/bip-0099.mediawiki#code
On Mon, Aug 20, 2018 at 10:14 PM, Gregory Maxwell via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote: > Since 2012 (IIRC) we've known that Bitcoin's non-overlapping > difficulty calculation was vulnerable to gaming with inaccurate > timestamps to massively increase the rate of block production beyond > the system's intentional design. It can be fixed with a soft-fork that > further constraints block timestamps, and a couple of proposals have > been floated along these lines. > > I put a demonstration of timewarp early in the testnet3 chain to also > let people test mitigations against that. It pegs the difficulty way > down and then churned out blocks at the maximum rate that the median > time protocol rule allows. > > I, and I assume others, haven't put a big priority into fixing this > vulnerability because it requires a majority hashrate and could easily > be blocked if someone started using it. > > But there haven't been too many other network consensus rules going on > right now, and I believe at least several of the proposals suggested > are fully compatible with existing behaviour and only trigger in the > presence of exceptional circumstances-- e.g. a timewarp attack. So > the risk of deploying these mitigations would be minimal. > > Before I dust off my old fix and perhaps prematurely cause fixation on > a particular approach, I thought it would be useful to ask the list if > anyone else was aware of a favourite backwards compatible timewarp fix > proposal they wanted to point out. > > Cheers. > _______________________________________________ > 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
