To: Brandon Smith <freedom@reardencode.com>, Gregory Maxwell <greg@xiph.org>, 
	Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
References: <3d4162e0-1f8b-0f23-85fc-9d18d4352cae@gmail.com>
	<CAAS2fgQqer6nMXXdcuoXE8UyJokuLTTLBwT+w0tH2+BA2gDu0w@mail.gmail.com>
	<20180906203244.GQ62902@hank.reardencode.com>
From: Alejandro Ranchal Pedrosa <a.ranchalpedrosa@gmail.com>
Message-ID: <caa38174-5bd9-74dd-deaa-3feb7a10822b@gmail.com>
Date: Fri, 7 Sep 2018 09:12:40 +0200
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Cc: Onder.GURCAN@cea.fr
Subject: Re: [bitcoin-dev] A BIP proposal for transactions that are
 'cancellable'
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Hi all,

Thank you for the link, and also to Gregory for the remarks. I did not 
know about this previous proposal. I think the last paragraph of future 
work is interesting:

"It may be interesting to add enhance OP_CHECKSEQUENCEVERIFY 
<https://github.com/bitcoin/bips/blob/master/bip-0112.mediawiki> to 
allow outputs that are spendable by Alice until time foo, always 
spendable by Bob, and spendable by Joe only after time bar, or other 
such cases"

Perhaps it would allow this functionality, while keeping the validity of 
coins, if the new OP_zzz took an additional argument than suggested, 
such that the first one is the timelimit for Alice to keep the coin (say 
in the first 24 hours), and after those 24 hours the ownership goes to 
the third argument, say Bob.

That is, it is not possible to use only specifying the owner in the 
first 24 hours. Would this be considered harmful?

Best,

Alejandro.

On 9/6/18 10:32 PM, Brandon Smith wrote:
> ade a similar proposal about 7 months ago, and documented some of the
> discussion points here:

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    <p>Hi all,<br>
    </p>
    <p>Thank you for the link, and also to Gregory for the remarks. I
      did not know about this previous proposal. I think the last
      paragraph of future work is interesting:</p>
    <p>"It may be interesting to add enhance <a
        href="https://github.com/bitcoin/bips/blob/master/bip-0112.mediawiki">OP_CHECKSEQUENCEVERIFY</a>
      to allow outputs that are spendable by Alice until time foo,
      always spendable by Bob, and spendable by Joe only after time bar,
      or other such cases" <br>
    </p>
    <p>Perhaps it would allow this functionality, while keeping the
      validity of coins, if the new OP_zzz took an additional argument
      than suggested, such that the first one is the timelimit for Alice
      to keep the coin (say in the first 24 hours), and after those 24
      hours the ownership goes to the third argument, say Bob.</p>
    <p>That is, it is not possible to use only specifying the owner in
      the first 24 hours. Would this be considered harmful?</p>
    <p>Best,</p>
    <p>Alejandro.<br>
    </p>
    <div class="moz-cite-prefix">On 9/6/18 10:32 PM, Brandon Smith
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:20180906203244.GQ62902@hank.reardencode.com">
      <pre class="moz-quote-pre" wrap="">ade a similar proposal about 7 months ago, and documented some of the
discussion points here:</pre>
    </blockquote>
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