/**
 * Audit chain primitive: monotonic per-row hash chain.
 *
 * Each row carries:
 * - content_hash: SHA-256(JCS(payload))
 * - prev_hash: previous row's content_hash, or null for the head row
 * - chain_position: monotonically increasing integer starting at 0
 *
 * This is the structure AlgoVoi's production /compliance/attestation chain
 * exposes (Object Lock COMPLIANCE retention to 2033-05-04).
 */
export declare class AuditChainError extends Error {
    constructor(message: string);
}
export interface AuditChainRow {
    chain_position: number;
    content_hash: string;
    prev_hash: string | null;
    payload: unknown;
}
/**
 * Build the next row in an audit chain.
 *
 * If prevRow is null, the new row becomes the head (chain_position = 0,
 * prev_hash = null). Otherwise chain_position increments and prev_hash
 * links to prevRow.content_hash.
 */
export declare function appendToChain(payload: unknown, prevRow: AuditChainRow | null): AuditChainRow;
/**
 * Verify a chain of audit rows is well-formed and linkage-consistent.
 *
 * Throws AuditChainError on any violation; otherwise returns void.
 */
export declare function verifyAuditChain(rows: readonly AuditChainRow[]): void;
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