/**
 * Gateway Receipt Verification
 * CVF-US-003: Verify gateway receipts for proof-of-harness
 */
import type { ModelIdentityTier, VerificationResult, VerificationError } from './types.js';
export interface ReceiptVerifierOptions {
    /**
     * Allowlisted gateway signer DIDs (did:key:...).
     * Fail-closed: if empty or missing, receipts are treated as INVALID.
     */
    allowlistedSignerDids?: readonly string[];
}
/**
 * Verify a gateway receipt signature envelope
 *
 * Acceptance Criteria:
 * - Validate receipt signature
 * - Check receipt schema
 * - Return verified provider/model
 */
export declare function verifyReceipt(envelope: unknown, options?: ReceiptVerifierOptions): Promise<{
    result: VerificationResult;
    provider?: string;
    model?: string;
    gateway_id?: string;
    model_identity_tier?: ModelIdentityTier;
    risk_flags?: string[];
    error?: VerificationError;
}>;
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