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From: Andrew C <achow101@gmail.com>
Date: Fri, 22 Jan 2016 16:36:58 +0000
Message-ID: <CADToNK-O-KWZjLzKAcUz9CZB65to=bCgTfRLTVFhLVKcCjO5bA@mail.gmail.com>
To: Bitcoin development mailing list <bitcoin-dev@lists.linuxfoundation.org>
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Subject: [bitcoin-dev] nSequence multiple uses
Precedence: list

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With 0.12 and opt-in RBF, nSequence will have multiple uses. It can be used
for locktime and now signaling for opting in to RBF. However, there is
nothing that I could find that distinguishes the uses for nSequence.
Spending a time locked output requires setting nSequence to less than
MAX_INT but opting into RBF also requires setting nSequence to less than
MAX_INT. By spending a time locked output, you would also be opting into
RBF, which may not be desired behavior. Since using nSequence to signal a
certain behavior will probably be used in the future, is there any plan to
change nSequence so that the features the transaction is using can be
distinguished? Perhaps something like version bits?

Thanks,
Andrew

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<div dir=3D"ltr">With 0.12 and opt-in RBF, nSequence will have multiple use=
s. It can be used for locktime and now signaling for opting in to RBF. Howe=
ver, there is nothing that I could find that distinguishes the uses for nSe=
quence. Spending a time locked output requires setting nSequence to less th=
an MAX_INT but opting into RBF also requires setting nSequence to less than=
 MAX_INT. By spending a time locked output, you would also be opting into R=
BF, which may not be desired behavior. Since using nSequence to signal a ce=
rtain behavior will probably be used in the future, is there any plan to ch=
ange nSequence so that the features the transaction is using can be disting=
uished? Perhaps something like version bits?=C2=A0</div><div dir=3D"ltr"><b=
r></div><div dir=3D"ltr">Thanks,</div><div dir=3D"ltr">Andrew</div>

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