/**
 * Returns the EIP-55-style mixed-case representation of a QRL address.
 * The checksum uses SHAKE256 over the lowercase ASCII hex address body,
 * not Keccak.
 */
export declare const toChecksumAddress: (data: string) => string;
/**
 * Checks the structural validity and optional SHAKE256 mixed-case checksum of
 * a QRL address. All-lowercase and all-uppercase address bodies are accepted as
 * non-checksummed compatibility forms. Mixed-case address bodies must match the
 * checksum exactly.
 */
export declare const checkAddressCheckSum: (data: string) => boolean;
/**
 * Checks if a given string is a valid QRL address.
 * If `checkChecksum` is false, only the Q + 128 hex structure is checked.
 * Otherwise lowercase/uppercase compatibility forms are accepted and mixed-case
 * inputs must match the SHAKE256 checksum.
 */
export declare const isAddressString: (value: string, checkChecksum?: boolean) => boolean;
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