Trait PublicKeyLookup 

pub trait PublicKeyLookup {
    // Required method
    fn pubkey_of(&self, index: u32) -> Option<&PublicKey>;
}

Validator-index → BLS public-key lookup.

Traces to SPEC §15.2, catalogue row DSL-138.

Consumers

• IndexedAttestation::verify_signature (DSL-006) materializes the pubkey set for the aggregate BLS verify by looking up every attesting_indices[i].
• verify_proposer_slashing / verify_invalid_block (DSL-013 / DSL-018) fetch the single proposer pubkey per offense.

Return semantics

pubkey_of(idx) returns None when idx does not correspond to a registered validator — the caller is responsible for translating that to a domain-appropriate error. For BLS verify, a missing pubkey collapses to aggregate-verify failure (DSL-006), which matches the security model: we do not want to distinguish “unknown validator” from “bad signature” at this layer because both are equally invalid evidence.

Required Methods

fn pubkey_of(&self, index: u32) -> Option<&PublicKey>

Look up the BLS G1 public key for index. Returns None if no validator is registered at that slot.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl<T: ValidatorView + ?Sized> PublicKeyLookup for T

Blanket: any ValidatorView is a PublicKeyLookup. DSL-138.

Delegates pubkey_of(idx) to self.get(idx).map(|e| e.public_key()). Keeps the BLS-aggregate verify path in DSL-006 + DSL-013 from having to pass two trait-object pointers when one suffices.