[Lightning-dev] eltoo implementation in Bitcoin functional test framework

[Bastien TEINTURIER]

Good morning Richard,

This is an interesting initiative, I'm curious to see the results!
I know we haven't worked on any Eltoo implementation yet at Acinq and I
don't know if others have attempted it.

However I have a very open question that may impact your project.
I'm starting to look at miniscript [1] (still a total noob though) and
listened to an interview where Pieter Wuille briefly mentioned that using
miniscript for lightning may be more future-proof and extensible than
directly using bitcoin script.
Have you considered first re-writing the Eltoo scripts with miniscript? Or
did someone else on this list attempt this already?
Do people on this list have opinions on whether that is the right direction
for Eltoo scripts (and maybe even for Bolt 1.x scripts if *any_prevout*
never makes it to Bitcoin scripts)?

Cheers,
Bastien

[1] http://bitcoin.sipa.be/miniscript/

Le mer. 4 sept. 2019 à 13:20, Richard Myers <rich at gotenna.com> a écrit :

> Hi All,
>
> To better understand how the eltoo update scheme (
> https://blockstream.com/eltoo.pdf ) works in practice I implemented eltoo
> in the Bitcoin functional test framework. These simulations exercise a
> concrete implementation of the eltoo Bitcoin scripts and explore the data
> flow between nodes that use eltoo to update their channel state.
>
> My motivation for creating these tests is to have a framework for both
> understanding and refining the Bitcoin scripts and message passing protocol
> for eltoo. I’d love to hear what people think of my initial implementation.
>
> This simulation uses a fork of Bitcoin with cdecker’s SIGHASH_NOINPUT
> patch applied to the signet2 fork fjahr created with patches applied for
> signet (kallewoof), taproot (sipa) and anyprevout* (ajtowns).
>
>
> https://github.com/remyers/signet2/blob/eltoo/test/functional/simulate_eltoo.py
>
> Next steps:
>
>    -
>
>    add bidirectional channel updates
>    -
>
>    derive public keys for settle transactions from a pre-shared basepoint
>
>
> Does anyone know of any other eltoo implementations? I’d love to compare
> notes and get the ball rolling on a detailed specification.
>
> Special thanks to the Chaincode Summer Residency and Christian Decker for
> their helpful advice and encouragement while I worked on this project.
>
>   -- Richard
>
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>
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