@lodestar/state-transition/lib/signatureSets/blsToExecutionChange.js

Beacon Chain state transition function and utils

import { PublicKey } from "@chainsafe/blst";
import { DOMAIN_BLS_TO_EXECUTION_CHANGE, ForkName } from "@lodestar/params";
import { ssz } from "@lodestar/types";
import { SignatureSetType, computeSigningRoot, verifySignatureSet } from "../util/index.js";
export function verifyBlsToExecutionChangeSignature(state, signedBLSToExecutionChange) {
    return verifySignatureSet(getBlsToExecutionChangeSignatureSet(state.config, signedBLSToExecutionChange));
}
/**
 * Extract signatures to allow validating all block signatures at once
 */
export function getBlsToExecutionChangeSignatureSet(config, signedBLSToExecutionChange) {
    // signatureFork for signing domain is fixed
    const signatureFork = ForkName.phase0;
    const domain = config.getDomainAtFork(signatureFork, DOMAIN_BLS_TO_EXECUTION_CHANGE);
    return {
        type: SignatureSetType.single,
        // The withdrawal pubkey is the same as signedBLSToExecutionChange's fromBlsPubkey as it should
        // be validated against the withdrawal credentials digest
        pubkey: PublicKey.fromBytes(signedBLSToExecutionChange.message.fromBlsPubkey, true),
        signingRoot: computeSigningRoot(ssz.capella.BLSToExecutionChange, signedBLSToExecutionChange.message, domain),
        signature: signedBLSToExecutionChange.signature,
    };
}
export function getBlsToExecutionChangeSignatureSets(config, signedBlock) {
    return signedBlock.message.body.blsToExecutionChanges.map((blsToExecutionChange) => getBlsToExecutionChangeSignatureSet(config, blsToExecutionChange));
}
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