Arbitrary data signature API

[alonmuroch]

Following the pre-conf notion (https://dear-twist-ac1.notion.site/Preconfirmations-API-Specification-1363b4619cb080a6a4cfd170c61771bc), all validators will need to perform a common step, which is signing a delegation.

I suspect future “validator-commitment” modules will also need such signatures.

My recommendation is to establish a generalized “sign arbitrary data” API between VC and commit-boost, with a dedicated domain type that renders slashing impossible.
This will enable commit-boost modules to request the VC (and DVT clusters) to sign arbitrary data, specifically in the pre-conf scenario, a delegate message.

Pros:

• Implement once, serve multiple use-cases

Cons:

• Might make the implementation more complex/ slower

[ltitanb]

this is basically what commit boost does at its core ? https://commit-boost.github.io/commit-boost-client/architecture/overview
we also have already integrated a custom domain #106

is anything else missing in your opinion?

[alonmuroch]

So just implement signer API for that?

[ltitanb]

The API is already implemented for local keystores, and Web3 signer

[ltitanb]

@alonmuroch let me know if anything missing or if we can close this