Today we have first-eligible-height (nLockTime), and mempool expiration measured from this height would work for the goals being discussed, no fork or protocol rev.

With first-eligible-height and last-eligible-height, creator could choose a lifetime shorter than the max,  and in addition, lock the whole thing until some point in the future.


On 8/6/2014 9:15 AM, Jeff Garzik wrote:
A fork is not necessarily required, if you are talking about information that deals primarily with pre-consensus mempool behavior.  You can make a "network TX" with some information that is digitally signed, yet discarded before it reaches miners.


On Wed, Aug 6, 2014 at 11:42 AM, Peter Todd <pete@petertodd.org> wrote:
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On 6 August 2014 08:17:02 GMT-07:00, Christian Decker <decker.christian@gmail.com> wrote:
>+1 for the new field, overloading fields with new meaning is definitely
>not
>a good idea.

To add a new field the best way to do it is create a new, parallel, tx format where fields are committed by merkle radix tree in an extensible and provable way. You'd then commit to that tree with a mandatory OP_RETURN output in the last txout, or with a new merkle root.

Changing the tx format itself in a hard-fork is needlessly disruptive, and in this case, wastes opportunities for improvement.
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--
Jeff Garzik
Bitcoin core developer and open source evangelist
BitPay, Inc.      https://bitpay.com/ 


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