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    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,&nbsp; and in addition, lock the
    whole thing until some point in the future.<br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 8/6/2014 9:15 AM, Jeff Garzik wrote:<br>
    </div>
    <blockquote
cite="mid:CAJHLa0OQJEvQht_chF1gVG_BOwp=DW0zOOo3VE_acZonsSguWw@mail.gmail.com"
      type="cite">
      <div dir="ltr">A fork is not necessarily required, if you are
        talking about information that deals primarily with
        pre-consensus mempool behavior.&nbsp; 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">&lt;<a moz-do-not-send="true"
              href="mailto:pete@petertodd.org" target="_blank">pete@petertodd.org</a>&gt;</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 class=""><br>
              <br>
              <br>
              On 6 August 2014 08:17:02 GMT-07:00, Christian Decker &lt;<a
                moz-do-not-send="true"
                href="mailto:decker.christian@gmail.com">decker.christian@gmail.com</a>&gt;
              wrote:<br>
              &gt;+1 for the new field, overloading fields with new
              meaning is definitely<br>
              &gt;not<br>
              &gt;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>
            -----BEGIN PGP SIGNATURE-----<br>
            Version: APG v1.1.1<br>
            <br>
iQFQBAEBCAA6BQJT4kzQMxxQZXRlciBUb2RkIChsb3cgc2VjdXJpdHkga2V5KSA8<br>
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4dQjkoldhw6rNMBTUmwvhSlL30KsT/msWTZiX7DW/YjfOzezEJzy+mYyKp9Sk7ba<br>
1fOiBXORk7mNOs7sTYTvje3sqEGpGTOLP08cY/RCEvl6bG8mHkPqwiojq+3biHFP<br>
RsoBVu1f5cbnU7Wq0gPNdVnQssnEQDadyTX8gT0Wze7PuVyaZT2mXFZBKzSHuLy2<br>
            sJKN<br>
            =oPSo<br>
            -----END PGP SIGNATURE-----<br>
            <br>
          </blockquote>
        </div>
        <br>
        <br clear="all">
        <br>
        -- <br>
        Jeff Garzik<br>
        Bitcoin core developer and open source evangelist<br>
        BitPay, Inc. &nbsp; &nbsp; &nbsp;<a moz-do-not-send="true"
          href="https://bitpay.com/" target="_blank">https://bitpay.com/</a>
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