Add new DomainType for application usage with "internal" namespace
#2884
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I like this approach more than #2882. |
djrtwo
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yeah makes sense, I'll update |
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## Issue Addressed Lays the groundwork for builder API changes by implementing the beacon-API's new `register_validator` endpoint ## Proposed Changes - Add a routine in the VC that runs on startup (re-try until success), once per epoch or whenever `suggested_fee_recipient` is updated, signing `ValidatorRegistrationData` and sending it to the BN. - TODO: `gas_limit` config options ethereum/builder-specs#17 - BN only sends VC registration data to builders on demand, but VC registration data *does update* the BN's prepare proposer cache and send an updated fcU to a local EE. This is necessary for fee recipient consistency between the blinded and full block flow in the event of fallback. Having the BN only send registration data to builders on demand gives feedback directly to the VC about relay status. Also, since the BN has no ability to sign these messages anyways (so couldn't refresh them if it wanted), and validator registration is independent of the BN head, I think this approach makes sense. - Adds upcoming consensus spec changes for this PR ethereum/consensus-specs#2884 - I initially applied the bit mask based on a configured application domain.. but I ended up just hard coding it here instead because that's how it's spec'd in the builder repo. - Should application mask appear in the api? Co-authored-by: realbigsean <sean@sigmaprime.io>
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Opening in lieu of #2882.
Context
This PR adds a new DomainType for use by applications adjacent to the core protocol so they can leverage the signing machinery developed here when working with consensus types.
An example use case is the work-in-progress Builder API where a validator may want to outsource block construction to a network of builders external to their local execution client. See ethereum/execution-apis#209 for details.
Rationale
This PR creates a "reserved" signing namespace for applications by setting the top bit in the
DomainType. Applications are still expected to set other bits in the remainder of theDomainTypedata to get domain separation from other applications using this scheme.This responsibility is on the applications to self-organize who uses which concrete
DomainTypes.Examples:
This approach is chosen over the approach in #2882 as there is less machinery to get right for users of the consensus spec.