import type { NostrEvent } from './types.js';
export interface ValidityResult {
    valid: boolean;
    reason?: 'revoked' | 'expired' | 'not-yet-active' | 'claim-expired';
}
/**
 * Check whether an attestation event is currently valid.
 * Checks revocation, NIP-40 expiration, valid_from, and valid_to.
 * Revocation always takes precedence.
 *
 * @param event - The attestation event to check
 * @param now - Unix timestamp to check against (defaults to current time)
 */
export declare function isValid(event: NostrEvent, now?: number): ValidityResult;
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