@lodestar/beacon-node/lib/chain/blocks/utils/chainSegment.js

A Typescript implementation of the beacon chain

import { ssz } from "@lodestar/types";
import { BlockError, BlockErrorCode } from "../../errors/index.js";
/**
 * Assert this chain segment of blocks is linear with slot numbers and hashes
 */
export function assertLinearChainSegment(config, blocks) {
    for (let i = 0; i < blocks.length - 1; i++) {
        const block = blocks[i].block;
        const child = blocks[i + 1].block;
        // If this block has a child in this chain segment, ensure that its parent root matches
        // the root of this block.
        if (!ssz.Root.equals(config.getForkTypes(block.message.slot).BeaconBlock.hashTreeRoot(block.message), child.message.parentRoot)) {
            throw new BlockError(block, { code: BlockErrorCode.NON_LINEAR_PARENT_ROOTS });
        }
        // Ensure that the slots are strictly increasing throughout the chain segment.
        if (child.message.slot <= block.message.slot) {
            throw new BlockError(block, { code: BlockErrorCode.NON_LINEAR_SLOTS });
        }
    }
}
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