@lodestar/beacon-node/lib/chain/validation/signatureSets/syncCommittee.js

A Typescript implementation of the beacon chain

import { DOMAIN_SYNC_COMMITTEE } from "@lodestar/params";
import { SignatureSetType, computeSigningRoot, } from "@lodestar/state-transition";
import { ssz } from "@lodestar/types";
export function getSyncCommitteeSignatureSet(state, syncCommittee) {
    const domain = state.config.getDomain(state.slot, DOMAIN_SYNC_COMMITTEE, syncCommittee.slot);
    return {
        type: SignatureSetType.single,
        pubkey: state.epochCtx.index2pubkey[syncCommittee.validatorIndex],
        signingRoot: computeSigningRoot(ssz.Root, syncCommittee.beaconBlockRoot, domain),
        signature: syncCommittee.signature,
    };
}
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