import type { ChainedEvent, RunEvent } from "./types.js";
/**
 * Append an event to a hash chain. The genesis event's `prev` is the
 * contract hash, which ties the whole chain to the signed contract.
 */
export declare function appendEvent(chain: ChainedEvent[], event: RunEvent, genesisPrev: string, now?: () => string): ChainedEvent;
export type ChainVerification = {
    ok: true;
} | {
    ok: false;
    brokenAtSeq: number;
    reason: string;
};
export declare function verifyChain(events: ChainedEvent[], genesisPrev: string): ChainVerification;