/**
 * Composite trust-query algorithm (PR #2440 in x402-foundation/x402).
 *
 * composite_hash = SHA-256(JCS([emitter_rows sorted by source_id, sig excluded]))
 *
 * Aggregates trust evidence from multiple emitters into a single canonical
 * hash. Properties:
 * - Row ordering invariance (sort-by-source_id).
 * - Set semantics (subset rows produce a distinct hash).
 * - Signature exclusion (sig field dropped before serialisation).
 *
 * 5-implementation cross-validation:
 * https://gist.github.com/chopmob-cloud/f2e9f0877b7d9fff70c8eca46e4ce636
 */
export declare class CompositeTrustQueryError extends Error {
    constructor(message: string);
}
export interface EmitterRow {
    source_id: string;
    [key: string]: unknown;
    sig?: unknown;
}
/**
 * Return the lowercase hex composite_hash for a set of emitter rows.
 *
 * Steps (per PR #2440 §composite-hash):
 *   1. Strip the sig field from each row.
 *   2. Sort rows by source_id (lexicographic).
 *   3. JCS-canonicalise the resulting array.
 *   4. SHA-256 the canonical bytes.
 *
 * Output is plain hex without an algorithm prefix.
 */
export declare function compositeTrustQueryHash(rows: readonly EmitterRow[]): string;
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