<div dir="ltr">That won't necessarily work through large reorgs. You don't want to create a situation where a miner cannot mine a previously mined transactions.<br><br></div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Wed, Aug 6, 2014 at 1:02 PM, Tom Harding <span dir="ltr"><<a href="mailto:tomh@thinlink.com" target="_blank">tomh@thinlink.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<br>
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.<br>
<br>
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.<div><div class="h5"><br>
<br>
<br>
<div>On 8/6/2014 9:15 AM, Jeff Garzik wrote:<br>
</div>
</div></div><blockquote type="cite"><div><div class="h5">
<div dir="ltr">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.<br>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Wed, Aug 6, 2014 at 11:42 AM, Peter
Todd <span dir="ltr"><<a href="mailto:pete@petertodd.org" target="_blank">pete@petertodd.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">-----BEGIN
PGP SIGNED MESSAGE-----<br>
Hash: SHA256<br>
<div><br>
<br>
<br>
On 6 August 2014 08:17:02 GMT-07:00, Christian Decker <<a href="mailto:decker.christian@gmail.com" target="_blank">decker.christian@gmail.com</a>>
wrote:<br>
>+1 for the new field, overloading fields with new
meaning is definitely<br>
>not<br>
>a good idea.<br>
<br>
</div>
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.<br>
<br>
Changing the tx format itself in a hard-fork is needlessly
disruptive, and in this case, wastes opportunities for
improvement.<br>
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</blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
Jeff Garzik<br>
Bitcoin core developer and open source evangelist<br>
BitPay, Inc. <a href="https://bitpay.com/" target="_blank">https://bitpay.com/</a>
</div>
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