/**
 * Hex and base64url helpers. Phase 4 wire format uses lowercase hex
 * WITHOUT `0x` prefix, and base64url WITHOUT padding (RFC 4648 §5).
 */
export declare function bytesToHex(bytes: Uint8Array): string;
export declare function hexToBytes(hex: string): Uint8Array;
/**
 * Base64url encode without padding. RFC 4648 §5.
 */
export declare function bytesToBase64url(bytes: Uint8Array): string;
export declare function base64urlToBytes(s: string): Uint8Array;
export declare function utf8Bytes(s: string): Uint8Array;
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