[bitcoin-dev] BIP 68 (Relative Locktime) bug

[Tom Harding]

Or you could flip the definition of your activation bit.  That would
avoid the inversion and put relative locktimes outside the realm of both
the MAX_INT and MAX_INT - 1 values.

It would also allow an explicit relative locktime of 0, which would help
applications avoid accidentally finalizing the whole transaction when
they only meant to not impose a relative locktime on one input.


On 7/5/2015 10:07 AM, Mark Friedenbach wrote:
> Note that you can put 0 in the sequence number field and it would work
> just as expected under the old rules. I will perhaps suggest instead
> that Bitcoin Core post-0.11 switch to doing this instead for that case.
>
> On Sun, Jul 5, 2015 at 8:00 AM, Tom Harding <tomh at thinlink.com
> <mailto:tomh at thinlink.com>> wrote:
>
>     BIP 68 uses nSequence to specify relative locktime, but nSequence also
>     continues to condition the transaction-level locktime.
>
>     This dual effect will prevent a transaction from having an effective
>     nLocktime without also requiring at least one of its inputs to be
>     mined
>     at least one block (or one second) ahead of its parent.
>
>     The fix is to shift the semantics so that nSequence = MAX_INT - 1
>     specifies 0 relative locktime, rather than 1.  This change will also
>     preserve the semantics of transactions that have already been created
>     with the specific nSequence value MAX_INT - 1 (for example all
>     transactions created by the bitcoin core wallet starting in 0.11).
>
>
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