From: Zawy <wordsgalore@gmail.com>
To: bitcoin-dev@lists.linuxfoundation.org
Subject: Re: [bitcoin-dev] Getting around to fixing the timewarp attack.
Date: Wed, 29 Aug 2018 05:54:17 -0400 [thread overview]
Message-ID: <CADtTMvkJHuz66KDNOnmsUBCEVkTpT7Ly9cB+o=C2n4KAR=4vZw@mail.gmail.com> (raw)
Rather than restricting every timestamp (or just the 2016*N+1
timestamps) to >= 1+ the previous timestamp as recorded on the
blockchain, the difficulty calculation could have the same restriction
but only in how the timestamps are used. I don't know about backwards
compatibility. Either way, this would also prevent the powLimit
attack that is also capable of getting "unlimited" blocks in less than
4 weeks of > 50% selfish mining. LTC, BCH, and LTC fixed to the
"Zeitgeist" or "timewarp" attack on GeistGeld in 2011 described by
Artforz in different ways, but all are still vulnerable by the
powLimit attack that I described here:
https://github.com/zawy12/difficulty-algorithms/issues/30
Other solutions may not prevent this other attack.
next reply other threads:[~2018-08-29 9:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-29 9:54 Zawy [this message]
-- strict thread matches above, loose matches on Subject: below --
2018-08-20 20:14 [bitcoin-dev] Getting around to fixing the timewarp attack Gregory Maxwell
2018-08-22 13:48 ` Jorge Timón
2018-08-24 9:35 ` Johnson Lau
2018-08-30 20:55 ` Bram Cohen
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