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Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] deterministic transaction expiration
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We could however introduce a new field in a new tx version. We know we need
to rev the format at some point anyway.
On Wed, Aug 6, 2014 at 2:55 PM, Jeff Garzik <jgarzik@bitpay.com> wrote:
> ...and existing users and uses of nLockTime suddenly become worthless,
> breaking payment channel refunds and other active uses of nLockTime.
>
> You cannot assume the user is around to rewrite their nLockTime, if it
> fails to be confirmed before some arbitrary deadline being set.
>
>
>
> On Wed, Aug 6, 2014 at 12:01 AM, Tom Harding <tomh@thinlink.com> wrote:
>
>> On 8/5/2014 12:10 PM, Kaz Wesley wrote:
>> > Any approach based on beginning a transaction expiry countdown when a
>> > transaction is received (as in mempool janitor) seems unviable to me:
>> > once a node has forgotten a transaction, it must be susceptible to
>> > reaccepting it;
>>
>> It's hard to argue with that logic.
>>
>> If nLockTime is used for expiration, transaction creator can't lie to
>> help tx live longer without pushing initial confirmation eligibility
>> into the future. Very pretty. It would also enable "fill or kill"
>> transactions with a backdated nLockTime, which must be confirmed in a
>> few blocks, or start vanishing from mempools.
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Infragistics Professional
>> Build stunning WinForms apps today!
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>> Build a bridge from your legacy apps to the future.
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>
>
>
> --
> Jeff Garzik
> Bitcoin core developer and open source evangelist
> BitPay, Inc. https://bitpay.com/
>
>
> ------------------------------------------------------------------------------
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<div dir=3D"ltr">We could however introduce a new field in a new tx version=
. We know we need to rev the format at some point anyway.</div><div class=
=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Wed, Aug 6, 2014 at =
2:55 PM, Jeff Garzik <span dir=3D"ltr"><<a href=3D"mailto:jgarzik@bitpay=
.com" target=3D"_blank">jgarzik@bitpay.com</a>></span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr">=C2=A0...and existing users=
and uses of nLockTime suddenly become worthless, breaking payment channel =
refunds and other active uses of nLockTime.<br>
<br>You cannot assume the user is around to rewrite their nLockTime, if it =
fails to be confirmed before some arbitrary deadline being set.<br>
<br></div><div class=3D"gmail_extra"><div><div class=3D"h5"><br><br><div cl=
ass=3D"gmail_quote">On Wed, Aug 6, 2014 at 12:01 AM, Tom Harding <span dir=
=3D"ltr"><<a href=3D"mailto:tomh@thinlink.com" target=3D"_blank">tomh@th=
inlink.com</a>></span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div>On 8/5/2014 12:10 PM, Kaz Wesley wrote:=
<br>
> Any approach based on beginning a transaction expiry countdown when a<=
br>
> transaction is received (as in mempool janitor) seems unviable to me:<=
br>
> once a node has forgotten a transaction, it must be susceptible to<br>
> reaccepting it;<br>
<br>
</div>It's hard to argue with that logic.<br>
<br>
If nLockTime is used for expiration, transaction creator can't lie to<b=
r>
help tx live longer without pushing initial confirmation eligibility<br>
into the future. =C2=A0Very pretty. =C2=A0It would also enable "fill o=
r kill"<br>
transactions with a backdated nLockTime, which must be confirmed in a<br>
few blocks, or start vanishing from mempools.<br>
<br>
<br>
---------------------------------------------------------------------------=
---<br>
Infragistics Professional<br>
Build stunning WinForms apps today!<br>
Reboot your WinForms applications with our WinForms controls.<br>
Build a bridge from your legacy apps to the future.<br>
<a href=3D"http://pubads.g.doubleclick.net/gampad/clk?id=3D153845071&iu=
=3D/4140/ostg.clktrk" target=3D"_blank">http://pubads.g.doubleclick.net/gam=
pad/clk?id=3D153845071&iu=3D/4140/ostg.clktrk</a><br>
<div><div>_______________________________________________<br>
Bitcoin-development mailing list<br>
<a href=3D"mailto:Bitcoin-development@lists.sourceforge.net" target=3D"_bla=
nk">Bitcoin-development@lists.sourceforge.net</a><br>
<a href=3D"https://lists.sourceforge.net/lists/listinfo/bitcoin-development=
" target=3D"_blank">https://lists.sourceforge.net/lists/listinfo/bitcoin-de=
velopment</a><br>
</div></div></blockquote></div><br><br clear=3D"all"><br></div></div><div c=
lass=3D"">-- <br>Jeff Garzik<br>Bitcoin core developer and open source evan=
gelist<br>BitPay, Inc. =C2=A0 =C2=A0 =C2=A0<a href=3D"https://bitpay.com/" =
target=3D"_blank">https://bitpay.com/</a>
</div></div>
<br>-----------------------------------------------------------------------=
-------<br>
Infragistics Professional<br>
Build stunning WinForms apps today!<br>
Reboot your WinForms applications with our WinForms controls.<br>
Build a bridge from your legacy apps to the future.<br>
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=3D/4140/ostg.clktrk" target=3D"_blank">http://pubads.g.doubleclick.net/gam=
pad/clk?id=3D153845071&iu=3D/4140/ostg.clktrk</a><br>__________________=
_____________________________<br>
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pment@lists.sourceforge.net</a><br>
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" target=3D"_blank">https://lists.sourceforge.net/lists/listinfo/bitcoin-de=
velopment</a><br>
<br></blockquote></div><br></div>
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