[bitcoin-dev] Note on Sequence Lock Upgrades Defect

David A. Harding dave at dtrt.org
Mon Sep 6 02:35:25 UTC 2021

On Fri, Sep 03, 2021 at 08:32:19PM -0700, Jeremy via bitcoin-dev wrote:
> Hi Bitcoin Devs,
> I recently noticed a flaw in the Sequence lock implementation with respect
> to upgradability. It might be the case that this is protected against by
> some transaction level policy (didn't see any in policy.cpp, but if not,
> I've put up a blogpost explaining the defect and patching it
> https://rubin.io/bitcoin/2021/09/03/upgradable-nops-flaw/

Isn't this why BIP68 requires using tx.version=2?  Wouldn't we just
deploy any new nSequence rules with tx.version>2?

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