/**
 * Copyright 2025 The Lotusia Stewardship
 * Github: https://github.com/LotusiaStewardship
 * License: MIT
 */
import { Buffer } from 'buffer/';
/**
 * Validate a sha256 hash
 * @param str - The sha256 hash to validate
 * @returns Whether the sha256 hash is valid
 */
export declare function isSha256(str: string): boolean;
/**
 * Convert a number or UTF-8 string to a hex string
 * @param data - The data to convert
 * @returns The hex string
 */
export declare function toHex(data: number | string | Buffer): string;
/**
 * Check if a string is hex-encoded, with optional `length` limit
 * @param str The string to check
 * @param length The length of the hex string to check. If not defined, checks the full string
 * @returns `true` if the string is hex-encoded, `false` otherwise
 */
export declare function isHex(str: string, length?: number): boolean;
/**
 * Check if a string is base64 encoded
 * @param str The string to check
 * @returns `true` if the string is base64 encoded, `false` otherwise
 */
export declare function isBase64(str: string): boolean;
/**
 * Decode a base64-encoded string
 * @param str The base64 encoded string to decode
 * @returns The decoded string
 */
export declare function decodeBase64(str: string): string;
/**
 * Encode a UTF-8 string to a base64-encoded string. Optionally provide a different
 * encoding scheme for the input string
 * @param str The string to encode
 * @returns The base64 encoded string
 */
export declare function encodeBase64(str: string, encoding?: BufferEncoding): string;
/**
 * Truncate a sha256 hash to 16 + 6 characters
 * @param sha256 - The sha256 hash to truncate
 * @returns The truncated sha256 hash
 */
export declare function truncateSha256(sha256: string): string;
/**
 * Truncate a transaction id to 16 + 6 characters
 * @param txid - The transaction id to truncate
 * @returns The truncated transaction id
 */
export declare function truncateTxid(txid: string): string;
/**
 * Truncate an address to 17 + 6 characters
 * @param address - The address to truncate
 * @returns The truncated address
 */
export declare function truncateAddress(address: string): string;
/**
 * Truncate a block hash to 1 + 16 characters
 * @param blockHash - The block hash to truncate
 * @returns The truncated block hash
 */
export declare function truncateBlockHash(blockHash: string): string;
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