+1 for the new field, overloading fields with new meaning is definitely not a good idea.

Something like nExpireAt with a block height sounds reasonable to me, but we need to document that the usual caveats with blockchain reorgs apply.


On Wed, Aug 6, 2014 at 4:08 PM, Jeff Garzik <jgarzik@bitpay.com> wrote:
 ...because nLockTime is the exact opposite of expiration.  A locked TX begins life invalid, and becomes valid (not-expired) after nLockTime passes.

A new field containing expiration time would work.



On Wed, Aug 6, 2014 at 10:44 AM, Tom Harding <tomh@thinlink.com> wrote:

How is eventual expiration of a tx that started life with an nLockTime in the future "breaking", any more than any other tx expiring?



On 8/6/2014 6:54 AM, Mike Hearn wrote:
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:
...

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.




--
Jeff Garzik
Bitcoin core developer and open source evangelist
BitPay, Inc.      https://bitpay.com/

------------------------------------------------------------------------------
Infragistics Professional
Build stunning WinForms apps today!
Reboot your WinForms applications with our WinForms controls.
Build a bridge from your legacy apps to the future.
http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk
_______________________________________________
Bitcoin-development mailing list
Bitcoin-development@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bitcoin-development