@lodestar/beacon-node/lib/sync/range/utils/hashBlocks.js

A Typescript implementation of the beacon chain

import { toRootHex } from "@lodestar/utils";
/**
 * String to uniquely identify block segments. Used for peer scoring and to compare if batches are equivalent.
 */
export function hashBlocks(blocks, config) {
    switch (blocks.length) {
        case 0:
            return "0x";
        case 1: {
            const block0 = blocks[0].getBlock();
            return toRootHex(config.getForkTypes(block0.message.slot).SignedBeaconBlock.hashTreeRoot(block0));
        }
        default: {
            const block0 = blocks[0].getBlock();
            const blockN = blocks.at(-1)?.getBlock();
            return (
            // TODO(fulu): should we be doing checks for presence to make sure these do not blow up?
            toRootHex(config.getForkTypes(block0.message.slot).SignedBeaconBlock.hashTreeRoot(block0)) +
                toRootHex(config.getForkTypes(blockN.message.slot).SignedBeaconBlock.hashTreeRoot(blockN)));
        }
    }
}
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