export interface ChainStateSubmission {
    submissionId: string;
    merkleRoot: string;
    payloadHash: string;
    blockNumber: number;
    dkgUal?: string;
}
export interface ChainState {
    nextBlockNumber: number;
    lastSubmission: ChainStateSubmission | null;
    /** Epoch ms of the last successfully processed time window (submitted or idle-skipped). */
    lastSubmittedAt: number | null;
}
/** Load chain state from disk. Returns default state if file doesn't exist. */
export declare function loadChainState(contextGraphRoot: string): Promise<ChainState>;
/** Save chain state to disk. Creates directory if needed. */
export declare function saveChainState(contextGraphRoot: string, state: ChainState): Promise<void>;
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