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From: Nadav Ivgi <nadav@shesek.info>
Date: Wed, 29 Jul 2020 18:10:42 +0300
Message-ID: <CAGXD5f3SiXHOmjSVxUQWOLT5SocQ62qTNGJOmTUtW7kDeduFjA@mail.gmail.com>
To: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
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Subject: [bitcoin-dev] Minsc, a Miniscript-based scripting language
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Hi all,
I recently released Minsc, a high-level scripting language for expressing
Bitcoin Script spending conditions using a simple and familiar syntax.
Minsc is based on the Miniscript Policy language, with additional features
and syntactic sugar sprinkled on top, including variables, functions, infix
notation, human-readable times and more.
A live compiler (Minsc->Policy->Miniscript->Script) and documentation are
available on the website: https://min.sc
Source code (in Rust) is available on github:
https://github.com/shesek/minsc
Some example Minsc scripts:
- A user and a 2FA service need to sign off, but after 90 days the user
alone is enough
pk(user_pk) && (9@pk(service_pk) || older(90 days))
- Traditional preimage-based HTLC
$redeem =3D pk(A) && sha256(H);
$refund =3D pk(B) && older(10);
likely@$redeem || $refund
- Liquid-like federated pegin with emergency recovery keys
$federation =3D 4 of [ pk(A), pk(B), pk(C), pk(D), pk(E) ];
$recovery =3D 2 of [ pk(F), pk(G), pk(H) ];
$timeout =3D older(heightwise 2 weeks);
likely@$federation || ($timeout && $recovery)
- The BOLT #3 received HTLC policy
fn htlc_received($revoke_pk, $local_pk, $remote_pk, $secret, $delay) =
{
$success =3D pk($local_pk) && hash160($secret);
$timeout =3D older($delay);
pk($revoke_pk) || (pk($remote_pk) && ($success || $timeout))
}
htlc_received(A, B, C, H, 3 hours)
- 2FA where the user has a 2-of-2 setup and the service provider is a
3-of-4 federation
fn two_factor($user, $provider, $delay) =3D
$user && (likely@$provider || older($delay));
$user =3D pk(user_desktop) && pk(user_mobile);
$providers =3D [ pk(P1), pk(P2), pk(P3), pk(P4) ];
two_factor($user, 3 of $providers, 4 months)
- Easily add NSA backdoors to everything =F0=9F=95=B5=EF=B8=8F=F0=9F=9A=AA
_backdoor=3Dpk(usgovt), _pk=3Dpk, _older=3Dolder, _after=3Dafter,
_sha256=3Dsha256, _ripemd160=3Dripemd160;
fn pk(x) =3D _pk(x) || _backdoor;
fn older(x) =3D _older(x) || _backdoor;
fn after(x) =3D _after(x) || _backdoor;
fn sha256(x) =3D _sha256(x) || _backdoor;
fn ripemd160(x) =3D _ripemd160(x) || _backdoor;
(pk(A) && sha256(H)) || (pk(B) && older(10))
Feedback is appreciated!
Nadav
P.S Since every Miniscript Policy is also a valid Minsc expression, the
min.sc web code editor UI could also be useful for experimenting with bare
policies. You'll get syntax highlighting, parentheses matching, real-time
compilation (in a web worker so the browser doesn't freeze) and syntax
error reporting.
--00000000000053ca9f05ab95f628
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Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr"><div>Hi all,<br></div><div><br></div><div>I recently relea=
sed Minsc, a high-level scripting language for expressing Bitcoin Script sp=
ending conditions using a simple and familiar syntax.</div><br>Minsc is bas=
ed on the Miniscript Policy language, with additional features and syntacti=
c sugar sprinkled on top, including variables, functions, infix notation, h=
uman-readable times and more.<br><br>A live compiler (Minsc->Policy->=
Miniscript->Script) and documentation are available on the website: <a h=
ref=3D"https://min.sc">https://min.sc</a><br><br>Source code (in Rust) is a=
vailable on github: <a href=3D"https://github.com/shesek/minsc">https://git=
hub.com/shesek/minsc</a><br><br>Some example Minsc scripts:<br><br>- A user=
and a 2FA service need to sign off, but after 90 days the user alone is en=
ough<br><br>=C2=A0 =C2=A0 =C2=A0 pk(user_pk) && (9@pk(service_pk) |=
| older(90 days))<br><br>- Traditional preimage-based HTLC<br><br>=C2=A0 =
=C2=A0 =C2=A0 $redeem =3D pk(A) && sha256(H);<br>=C2=A0 =C2=A0 =C2=
=A0 $refund =3D pk(B) && older(10);<br><br>=C2=A0 =C2=A0 =C2=A0 lik=
ely@$redeem || $refund<br><br>- Liquid-like federated pegin with emergency =
recovery keys<br><br>=C2=A0 =C2=A0 =C2=A0 $federation =3D 4 of [ pk(A), pk(=
B), pk(C), pk(D), pk(E) ];<br>=C2=A0 =C2=A0 =C2=A0 $recovery =3D 2 of [ pk(=
F), pk(G), pk(H) ];<br>=C2=A0 =C2=A0 =C2=A0 $timeout =3D older(heightwise 2=
weeks);<br><br>=C2=A0 =C2=A0 =C2=A0 likely@$federation || ($timeout &&=
amp; $recovery)<br><br>- The BOLT #3 received HTLC policy<br><br>=C2=A0 =C2=
=A0 =C2=A0 fn htlc_received($revoke_pk, $local_pk, $remote_pk, $secret, $de=
lay) {<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 $success =3D pk($local_pk) &&=
hash160($secret);<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 $timeout =3D older($delay=
);<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 <br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 pk($revok=
e_pk) || (pk($remote_pk) && ($success || $timeout))<br>=C2=A0 =C2=
=A0 =C2=A0 }<br><br>=C2=A0 =C2=A0 =C2=A0 htlc_received(A, B, C, H, 3 hours)=
<br><br>- 2FA where the user has a 2-of-2 setup and the service provider is=
a 3-of-4 federation<br><br>=C2=A0 =C2=A0 =C2=A0 fn two_factor($user, $prov=
ider, $delay) =3D <br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 $user && (likely@=
$provider || older($delay));<br><br>=C2=A0 =C2=A0 =C2=A0 $user =3D pk(user_=
desktop) && pk(user_mobile);<br>=C2=A0 =C2=A0 =C2=A0 $providers =3D=
[ pk(P1), pk(P2), pk(P3), pk(P4) ];<br>=C2=A0 =C2=A0 =C2=A0 <br>=C2=A0 =C2=
=A0 =C2=A0 two_factor($user, 3 of $providers, 4 months)<br><br>- Easily add=
NSA backdoors to everything =F0=9F=95=B5=EF=B8=8F=F0=9F=9A=AA<br><br>=C2=
=A0 =C2=A0 =C2=A0 _backdoor=3Dpk(usgovt), _pk=3Dpk, _older=3Dolder, _after=
=3Dafter,<br>=C2=A0 =C2=A0 =C2=A0 _sha256=3Dsha256, _ripemd160=3Dripemd160;=
<br><br>=C2=A0 =C2=A0 =C2=A0 fn pk(x) =3D _pk(x) || _backdoor;<br>=C2=A0 =
=C2=A0 =C2=A0 fn older(x) =3D _older(x) || _backdoor;<br>=C2=A0 =C2=A0 =C2=
=A0 fn after(x) =3D _after(x) || _backdoor;<br>=C2=A0 =C2=A0 =C2=A0 fn sha2=
56(x) =3D _sha256(x) || _backdoor;<br>=C2=A0 =C2=A0 =C2=A0 fn ripemd160(x) =
=3D _ripemd160(x) || _backdoor;<br><br>=C2=A0 =C2=A0 =C2=A0 (pk(A) &&am=
p; sha256(H)) || (pk(B) && older(10))<br><br>Feedback is appreciate=
d!<br><br>Nadav<br><br>P.S Since every Miniscript Policy is also a valid Mi=
nsc expression, the <a href=3D"http://min.sc">min.sc</a> web code editor UI=
could also be useful for experimenting with bare policies. You'll get =
syntax highlighting, parentheses matching, real-time compilation (in a web =
worker so the browser doesn't freeze) and syntax error reporting.</div>
--00000000000053ca9f05ab95f628--
|
