ConvertHexToBase58Check.cs

        //轉換成 TRC20 
        static string ConvertHexToBase58Check(string hexAddress)
        {
            byte[] addressBytes = HexToBytes(hexAddress);

            // 計算雙重 SHA-256 校驗碼
            using (SHA256 sha256 = SHA256.Create())
            {
                byte[] hash1 = sha256.ComputeHash(addressBytes);
                byte[] hash2 = sha256.ComputeHash(hash1);

                // 取前 4 位作為校驗碼
                byte[] checksum = hash2.Take(4).ToArray();

                // 拼接地址與校驗碼
                byte[] addressWithChecksum = addressBytes.Concat(checksum).ToArray();

                // 轉換為 Base58
                return EncodeBase58(addressWithChecksum);
            }
        }

        static byte[] HexToBytes(string hex)
        {
            return Enumerable.Range(0, hex.Length / 2)
                             .Select(x => Convert.ToByte(hex.Substring(x * 2, 2), 16))
                             .ToArray();
        }

        static string EncodeBase58(byte[] input)
        {
            var Base58Chars = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";

            var intData = new BigInteger(input.Reverse().Concat(new byte[] { 0 }).ToArray());

            string result = "";
            while (intData > 0)
            {
                int remainder = (int)(intData % 58);
                intData /= 58;
                result = Base58Chars[remainder] + result;
            }

            // 保留前導 0
            foreach (byte b in input)
            {
                if (b == 0) result = '1' + result;
                else break;
            }

            return result;
        }