A new network tx field would have the same problem, right?

With a child-refreshes-parent policy, someone wishing to redeem a transaction that has passed its relay window without being confirmed could still do so.

On Aug 8, 2014 11:16 AM, "Jeff Garzik" <jgarzik@bitpay.com> wrote:
On Fri, Aug 8, 2014 at 1:38 PM, Tom Harding <tomh@thinlink.com> wrote:
>> 4. add a new IsStandard rule rejecting transactions with an nLockTime
>> more than N blocks behind the current tip (for some fixed value N, to
>> be determined)

It cannot be assumed that transaction creation time and transaction
publish-to-outside-world time are the same, even though they often
are.

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

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