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From: Jeremy Rubin <jeremy.l.rubin@gmail.com>
Date: Sun, 6 Mar 2022 00:14:51 +0000
Message-ID: <CAD5xwhjgLG0sVS3Zy5=tJt8cdgj75L4Us1SDZDcw6ZO1Juc=NA@mail.gmail.com>
To: ZmnSCPxj <ZmnSCPxj@protonmail.com>, 
 Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
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Cc: "dlc-dev@mailmanlists.org" <dlc-dev@mailmanlists.org>
Subject: Re: [bitcoin-dev] Recurring bitcoin/LN payments using DLCs
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This may be of interest:

https://github.com/sapio-lang/sapio/blob/01830132bbbe39c3225e173e099f6e1a0611461c/sapio/examples/subscription.py

Basically, a (old, python) sapio contract whereby you can make cancellable
subscriptions that are essentially a time based autopay scheme whereby
cancellation gives time for the receiver to claim the correct amount of
money.

--
@JeremyRubin <https://twitter.com/JeremyRubin>

On Sat, Mar 5, 2022 at 10:58 PM ZmnSCPxj via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> Good morning Chris,
>
> > I think this proposal describes arbitrary lines of pre-approved credit
> from a bitcoin wallet. The line can be drawn down with oracle attestations.
> You can mix in locktimes on these pre-approved lines of credit if you would
> like to rate limit, or ignore rate limiting and allow the full utxo to be
> spent by the borrower. It really is contextual to the use case IMO.
>
> Ah, that seems more useful.
>
> Here is an example application that might benefit from this scheme:
>
> I am commissioning some work from some unbranded workperson.
> I do not know how long the work will take, and I do not trust the
> workperson to accurately tell me how complete the work is.
> However, both I and the workperson trust a branded third party (the
> oracle) who can judge the work for itself and determine if it is complete
> or not.
> So I create a transaction whose signature can be completed only if the
> oracle releases a proper scalar and hand it over to the workperson.
> Then the workperson performs the work, then asks the oracle to judge if
> the work has been completed, and if so, the work can be compensated.
>
> On the other hand, the above, where the oracle determines *when* the fund
> can be spent, can also be implemented by a simple 2-of-3, and called an
> "escrow".
> After all, the oracle attestation can be a partial signature as well, not
> just a scalar.
> Is there a better application for this scheme?
>
> I suppose if the oracle attestation is intended to be shared among
> multiple such transactions?
> There may be multiple PTLCs, that are triggered by a single oracle?
>
> Regards,
> ZmnSCPxj
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small;color:#000000">This may be of interest:<=
/div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans=
-serif;font-size:small;color:#000000"><br></div><div class=3D"gmail_default=
" style=3D"font-family:arial,helvetica,sans-serif;font-size:small;color:#00=
0000"><a href=3D"https://github.com/sapio-lang/sapio/blob/01830132bbbe39c32=
25e173e099f6e1a0611461c/sapio/examples/subscription.py">https://github.com/=
sapio-lang/sapio/blob/01830132bbbe39c3225e173e099f6e1a0611461c/sapio/exampl=
es/subscription.py</a><br></div><div class=3D"gmail_default" style=3D"font-=
family:arial,helvetica,sans-serif;font-size:small;color:#000000"><br></div>=
<div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-seri=
f;font-size:small;color:#000000">Basically, a (old, python) sapio contract =
whereby you can make cancellable subscriptions that are essentially a time =
based autopay scheme whereby cancellation gives time for the receiver=C2=A0=
to claim the correct amount of money.</div><br clear=3D"all"><div><div dir=
=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div =
dir=3D"ltr">--<br><a href=3D"https://twitter.com/JeremyRubin" target=3D"_bl=
ank">@JeremyRubin</a><br></div></div></div></div><br><div class=3D"gmail_qu=
ote"><div dir=3D"ltr" class=3D"gmail_attr">On Sat, Mar 5, 2022 at 10:58 PM =
ZmnSCPxj via bitcoin-dev &lt;<a href=3D"mailto:bitcoin-dev@lists.linuxfound=
ation.org">bitcoin-dev@lists.linuxfoundation.org</a>&gt; wrote:<br></div><b=
lockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-le=
ft-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);pad=
ding-left:1ex">Good morning Chris,<br>
<br>
&gt; I think this proposal describes arbitrary lines of pre-approved credit=
 from a bitcoin wallet. The line can be drawn down with oracle attestations=
. You can mix in locktimes on these pre-approved lines of credit if you wou=
ld like to rate limit, or ignore rate limiting and allow the full utxo to b=
e spent by the borrower. It really is contextual to the use case IMO.<br>
<br>
Ah, that seems more useful.<br>
<br>
Here is an example application that might benefit from this scheme:<br>
<br>
I am commissioning some work from some unbranded workperson.<br>
I do not know how long the work will take, and I do not trust the workperso=
n to accurately tell me how complete the work is.<br>
However, both I and the workperson trust a branded third party (the oracle)=
 who can judge the work for itself and determine if it is complete or not.<=
br>
So I create a transaction whose signature can be completed only if the orac=
le releases a proper scalar and hand it over to the workperson.<br>
Then the workperson performs the work, then asks the oracle to judge if the=
 work has been completed, and if so, the work can be compensated.<br>
<br>
On the other hand, the above, where the oracle determines *when* the fund c=
an be spent, can also be implemented by a simple 2-of-3, and called an &quo=
t;escrow&quot;.<br>
After all, the oracle attestation can be a partial signature as well, not j=
ust a scalar.<br>
Is there a better application for this scheme?<br>
<br>
I suppose if the oracle attestation is intended to be shared among multiple=
 such transactions?<br>
There may be multiple PTLCs, that are triggered by a single oracle?<br>
<br>
Regards,<br>
ZmnSCPxj<br>
_______________________________________________<br>
bitcoin-dev mailing list<br>
<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" target=3D"_blank">=
bitcoin-dev@lists.linuxfoundation.org</a><br>
<a href=3D"https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev" =
rel=3D"noreferrer" target=3D"_blank">https://lists.linuxfoundation.org/mail=
man/listinfo/bitcoin-dev</a><br>
</blockquote></div>

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