/**
 * Checks if a string appears to be in a valid TLV format (superficial validation).
 *
 * This does NOT guarantee the entire structure is valid — it only checks the initial pattern.
 *
 * @param tlv - The raw string to validate.
 * @returns True if the string starts with a valid TLV structure, false otherwise.
 */
export declare function isValidTLVFormat(tlv: string): boolean;