This ERC suggests the standard interfaces for registering and discovering the block builders through on-chain registry contracts, as one of the many non-competitive potential discovery methods after the inclusion of EIP-7732 (ePBS). These interfaces allow many permissionless or permissioned registries to be implemented with out-of-the-box support for signed builder registration and consensus client reads.
As briefly outlined in the ERC, multiple discovery methods are possible with different upsides and downsides. Using smart contracts for builder discovery is a natural fit since it enables creation of one or many permissionless lists with free entry for builders and permissioned ones with diverse purposes. After EIP-7732 reduces reliance on intermediaries like relays, the adoption of this ERC will provide a few benefits:
- Open entry for new builders
- Avoiding competition-related censorship
- Participation in or curation of builder lists on a neutral layer
- Continuous list availability through the execution layer
We foresee that there will be at least one permissionless global registry for any builder to register to and get discovered by proposers. Meanwhile, proposers will maintain all freedom to add/remove in their configuration any list based on specific interest.