/**
 * Witnessed Web Receipt Verification
 * POH-US-018
 */
import type { WebReceiptPayload, VerificationResult, VerificationError } from './types.js';
export interface WebReceiptVerifierOptions {
    /**
     * Allowlisted witness signer DIDs (did:key:...).
     * Fail-closed: if empty or missing, web receipts are treated as INVALID.
     */
    allowlistedSignerDids?: readonly string[];
}
export declare function verifyWebReceipt(envelope: unknown, options?: WebReceiptVerifierOptions): Promise<{
    result: VerificationResult;
    witness_id?: string;
    source?: WebReceiptPayload['source'];
    proof_tier?: 'witnessed_web';
    equivalent_to_gateway?: boolean;
    error?: VerificationError;
}>;
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