/**
 * Nonce – unique value for replay prevention. Immutable value object.
 *
 * @remarks
 * Used by the envelope to bind each wrapped result to a unique value;
 * verification layer (SDK) should reject duplicate nonces within a time window.
 */
export type Nonce = {
    readonly value: string;
};
/**
 * Creates a unique nonce (default 16 bytes, hex-encoded).
 *
 * @param length - Length in bytes (8–64)
 * @returns Frozen Nonce value object
 */
export declare function createNonce(length?: number): Nonce;
/**
 * Validates that a string is a valid nonce format (hex, 16–128 chars).
 */
export declare function isValidNonce(value: string): boolean;
/**
 * Compares two nonces for equality.
 */
export declare function equalsNonce(nonce1: Nonce, nonce2: Nonce): boolean;
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