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From: Jeremy Rubin <jeremy.l.rubin@gmail.com>
Date: Sun, 20 Feb 2022 08:45:35 -0800
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Subject: Re: [bitcoin-dev] [Lightning-dev] [Pre-BIP] Fee Accounts
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--000000000000fec68105d875d8bb
Content-Type: text/plain; charset="UTF-8"
Morning!
>
> For the latter case, CPFP would work and already exists.
> **Unless** you are doing something complicated and offchain-y and involves
> relative locktimes, of course.
>
>
The "usual" design I recommend for Vaults contains something that is like:
{<maturity> CSV <pk_hot> CHECKSIG, <pk_cold> CHECKSIG}
or
{<maturity> CSV <pk_hot> CHECKSIG, <H(tx to: <pk_cold> CHECKSIG)> CTV}
where after an output is created, it has to hit maturity before hot
spendable but can be kicked to recovery any time before (optional: use CTV
to actually transition on chain removing hot wallet, if cold key is hard to
access).
Not that this means if you're waiting for one of these outputs to be
created on chain, you cannot spend from the hot key since it needs to
confirm on chain first. Spending from the cold key for CPFP'ing the hot is
an 'invalid move' (emergency key for non emergency sitch)
Thus in order to CPFP, you would need a separate output just for CPFPing
that is not subject to these restrictions, or some sort of RBF-able addable
input/output. Or, Sponsors.
Jeremy
--000000000000fec68105d875d8bb
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr"><div class=3D"gmail_quote"><div class=3D"gmail_default" st=
yle=3D"font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(0,0=
,0)">Morning!</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0p=
x 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color=
:rgb(204,204,204);padding-left:1ex">
<br>
For the latter case, CPFP would work and already exists.<br>
**Unless** you are doing something complicated and offchain-y and involves =
relative locktimes, of course.<br><br></blockquote><div><br></div><div clas=
s=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-si=
ze:small;color:rgb(0,0,0)">The "usual" design I recommend for Vau=
lts contains something that is like:</div><div class=3D"gmail_default" styl=
e=3D"font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(0,0,0=
)"><br></div><div class=3D"gmail_default" style=3D"font-family:arial,helvet=
ica,sans-serif;font-size:small;color:rgb(0,0,0)"><span style=3D"color:rgb(3=
4,34,34)">{<maturity> CSV <pk_hot> CHECKSIG, <pk_cold> CH=
ECKSIG}</span><br></div><div class=3D"gmail_default" style=3D"font-family:a=
rial,helvetica,sans-serif;font-size:small;color:rgb(0,0,0)"><span style=3D"=
color:rgb(34,34,34)">or</span></div><div class=3D"gmail_default" style=3D"f=
ont-family:arial,helvetica,sans-serif;font-size:small;color:rgb(0,0,0)"><di=
v class=3D"gmail_default"><span style=3D"color:rgb(34,34,34)">{<maturity=
> CSV <pk_hot> CHECKSIG, <H(tx to: <pk_cold> CHECKSIG)>=
; CTV}</span><br></div><br class=3D"gmail-Apple-interchange-newline"></div>=
<div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-seri=
f;font-size:small;color:rgb(0,0,0)"><span style=3D"color:rgb(34,34,34)"><br=
></span></div><div class=3D"gmail_default" style=3D"font-family:arial,helve=
tica,sans-serif;font-size:small">where after an output is created, it has t=
o hit maturity before hot spendable but can be kicked to recovery any time =
before (optional: use CTV to actually transition on chain removing hot wall=
et, if cold key is hard to access).</div><div class=3D"gmail_default" style=
=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div =
class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;fon=
t-size:small"><br></div><div class=3D"gmail_default" style=3D"font-family:a=
rial,helvetica,sans-serif;font-size:small">Not that this means if you'r=
e waiting for one of these outputs to be created on chain, you cannot spend=
from the hot key since it needs to confirm on chain first. Spending from t=
he cold key for CPFP'ing the hot is an 'invalid move' (emergenc=
y key for non emergency sitch)</div><div class=3D"gmail_default" style=3D"f=
ont-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class=
=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-siz=
e:small">Thus in order to CPFP, you would need a separate output just for C=
PFPing that is not subject to these restrictions, or some sort of RBF-able =
addable input/output. Or, Sponsors.</div><div class=3D"gmail_default" style=
=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div =
class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;fon=
t-size:small"><br></div><div class=3D"gmail_default" style=3D"font-family:a=
rial,helvetica,sans-serif;font-size:small">Jeremy</div><div class=3D"gmail_=
default" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><=
br></div></div></div>
--000000000000fec68105d875d8bb--
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