From: Braydon Fuller <braydon@purse•io>
To: Tier Nolan <tier.nolan@gmail•com>,
Bitcoin Protocol Discussion
<bitcoin-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] Chain width expansion
Date: Wed, 16 Oct 2019 12:07:25 -0700 [thread overview]
Message-ID: <8d1e2696-0245-638a-61fa-8f79845136d5@purse.io> (raw)
In-Reply-To: <CAE-z3OVqU5n8H9vKj9Pn7k80guMTsxt_CkN9qwpfCK8HB4PDgQ@mail.gmail.com>
On 10/12/19 1:46 PM, Tier Nolan via bitcoin-dev wrote:
> On Sat, Oct 12, 2019 at 6:56 PM Joachim Strömbergson <joachimstr@protonmail•com> wrote:
>> On different note, one of the problems that I haven't seen mentioned here
>> yet is the timewarp attack. It is relevant to some of the proposed
>> solutions. It should be possible, IIRC, for a malicious node to generate
>> much longer chain with superslow timestamp increase (~5 blocks in 1 second)
>> without increasing difficulty (i.e. staying at min. diff.). This could
>> produce chain that is ~2500 times longer than main chain without having
>> multiple branches.
>>
> [..]
>
> The timewarp bug can be fixed by a basic soft fork. You just need to limit
> the maximum difference between the timestamp for the first header in a
> period and the last header in the previous period.
Yeah, that makes sense as it corrects the off-by-one error. I think this
solution has been included in a draft proposal "The Great Consensus
Cleanup". It would need to be effective for not only the main chain but
also for any future forked chain.
next prev parent reply other threads:[~2019-10-16 19:07 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-04 0:38 Braydon Fuller
2019-10-04 8:20 ` David A. Harding
2019-10-04 19:51 ` Braydon Fuller
2019-10-11 21:24 ` Braydon Fuller
2019-10-04 23:31 ` Tier Nolan
2019-10-10 16:16 ` Braydon Fuller
2019-10-12 16:27 ` Tier Nolan
2019-10-12 17:56 ` Joachim Strömbergson
2019-10-12 20:46 ` Tier Nolan
2019-10-16 19:07 ` Braydon Fuller [this message]
2019-10-15 0:42 ` Braydon Fuller
2019-10-15 7:20 ` Joachim Strömbergson
2019-10-15 8:12 ` Braydon Fuller
2019-10-15 15:50 ` Joachim Strömbergson
2019-10-16 19:25 ` Braydon Fuller
2019-10-15 18:30 ` Tier Nolan
2019-10-15 0:38 ` Braydon Fuller
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