gistfile1.txt

  <ItemGroup>
    <PackageReference Include="Nethereum.Web3" Version="3.8.0" />
    <PackageReference Include="Nethereum.ABI" Version="3.8.0" />
    <PackageReference Include="nunit" Version="3.12.0" />
    <PackageReference Include="NUnit3TestAdapter" Version="3.15.1" />
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
    <PackageReference Include="NBitcoin.Secp256k1" Version="1.0.1" />
    <PackageReference Include="NBitcoin" Version="5.0.27" />
    <PackageReference Include="RestSharp" Version="106.10.1" />
    <PackageReference Include="Moq" Version="4.14.6" />
  </ItemGroup>

gistfile2.txt

<PackageReference Include="HDWallet.Tron" Version="0.1.2" />

unittest.cs

using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using HDWallet.Core;
using HDWallet.Tron;
using NBitcoin.DataEncoders;
using Nethereum.Contracts;
using Nethereum.RPC.Eth.DTOs;
using Newtonsoft.Json;
using NUnit.Framework;

namespace TronSharp.Tests.SmartContract
{
    public static class AddressHelper
    {
        public static byte[] ToHexByteArray(this string tronAddress)
        {
            return Encoders.Base58Check.DecodeData(tronAddress);
        }

        public static string ToHexString(this string tronAddress)
        {
            return ToHexByteArray(tronAddress).ToHexString();
        }

        public static string ToVisibleAddress(this string tronAddress)
        {
            if (string.IsNullOrWhiteSpace(tronAddress))
            {
                return null;
            }

            byte[] bytes = tronAddress.FromHexToByteArray();
            return Encoders.Base58Check.EncodeData(bytes);
        }
    }
    
    public class BroadCastTrc20
    {
        [Test]
        public async Task ShouldBroadCast()
        {
            IHDWallet<TronWallet> wallet = new TronHDWallet("push wrong tribe amazing again cousin hill belt silent found sketch monitor");
            TronWallet wallet0 = wallet.GetAccount(0).GetExternalWallet(0);
            string wallet0Address = wallet0.Address;

            TronWallet wallet1 = wallet.GetAccount(0).GetExternalWallet(1);
            string wallet1Address = wallet1.Address;
            
            var ownerAddress = AddressHelper.ToHexString(wallet0Address); 
            var fromAddress = AddressHelper.ToHexString(wallet0Address).Substring(2);
            var toAddress = AddressHelper.ToHexString(wallet1Address).Substring(2);

            var abi = "[{\"constant\":true,\"inputs\":[],\"name\":\"name\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_upgradedAddress\",\"type\":\"address\"}],\"name\":\"deprecate\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_spender\",\"type\":\"address\"},{\"name\":\"_value\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"deprecated\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_evilUser\",\"type\":\"address\"}],\"name\":\"addBlackList\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"totalSupply\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_from\",\"type\":\"address\"},{\"name\":\"_to\",\"type\":\"address\"},{\"name\":\"_value\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"upgradedAddress\",\"outputs\":[{\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"decimals\",\"outputs\":[{\"name\":\"\",\"type\":\"uint8\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"maximumFee\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"_totalSupply\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[],\"name\":\"unpause\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"_maker\",\"type\":\"address\"}],\"name\":\"getBlackListStatus\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"paused\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_spender\",\"type\":\"address\"},{\"name\":\"_subtractedValue\",\"type\":\"uint256\"}],\"name\":\"decreaseApproval\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"who\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"_value\",\"type\":\"uint256\"}],\"name\":\"calcFee\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[],\"name\":\"pause\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"owner\",\"outputs\":[{\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"symbol\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_to\",\"type\":\"address\"},{\"name\":\"_value\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"who\",\"type\":\"address\"}],\"name\":\"oldBalanceOf\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"newBasisPoints\",\"type\":\"uint256\"},{\"name\":\"newMaxFee\",\"type\":\"uint256\"}],\"name\":\"setParams\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"issue\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_spender\",\"type\":\"address\"},{\"name\":\"_addedValue\",\"type\":\"uint256\"}],\"name\":\"increaseApproval\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"redeem\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"_owner\",\"type\":\"address\"},{\"name\":\"_spender\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"name\":\"remaining\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"basisPointsRate\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"\",\"type\":\"address\"}],\"name\":\"isBlackListed\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_clearedUser\",\"type\":\"address\"}],\"name\":\"removeBlackList\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"MAX_UINT\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"transferOwnership\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_blackListedUser\",\"type\":\"address\"}],\"name\":\"destroyBlackFunds\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"name\":\"_initialSupply\",\"type\":\"uint256\"},{\"name\":\"_name\",\"type\":\"string\"},{\"name\":\"_symbol\",\"type\":\"string\"},{\"name\":\"_decimals\",\"type\":\"uint8\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"name\":\"_blackListedUser\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"_balance\",\"type\":\"uint256\"}],\"name\":\"DestroyedBlackFunds\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"Issue\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"Redeem\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"newAddress\",\"type\":\"address\"}],\"name\":\"Deprecate\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"name\":\"_user\",\"type\":\"address\"}],\"name\":\"AddedBlackList\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"name\":\"_user\",\"type\":\"address\"}],\"name\":\"RemovedBlackList\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"name\":\"feeBasisPoints\",\"type\":\"uint256\"},{\"indexed\":false,\"name\":\"maxFee\",\"type\":\"uint256\"}],\"name\":\"Params\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[],\"name\":\"Pause\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[],\"name\":\"Unpause\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"name\":\"previousOwner\",\"type\":\"address\"},{\"indexed\":true,\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnershipTransferred\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"name\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"}]";
            var contractAddress = AddressHelper.ToHexString("TQQg4EL8o1BSeKJY4MJ8TB8XK7xufxFBvK");

            ContractBuilder contractBuilder = new ContractBuilder(abi, contractAddress);
            var functionSignature = contractBuilder.GetFunctionAbi("transfer").Sha3Signature;

            Nethereum.Contracts.Contract contract = new Nethereum.Contracts.Contract(null, abi, contractAddress);

            Function transferFunction = contract.GetFunction("transfer");
            TransactionInput input = transferFunction.CreateTransactionInput(string.Empty, toAddress, 50000000000);
            string inputData = input.Data;
            string parameter = input.Data.Replace($"0x{functionSignature}", "");

            var url = "https://api.shasta.trongrid.io";
            string resultContent;
            using (var client = new HttpClient(){ BaseAddress = new Uri(url)})
            {
                TriggerSmartContractRequest req = new TriggerSmartContractRequest()
                {
                    owner_address = ownerAddress,
                    contract_address = contractAddress,
                    function_selector = "transfer(address,uint256)",
                    parameter = parameter,
                    fee_limit = 1000000
                };

                var serializedData = JsonConvert.SerializeObject(req);
                
                var requestData = new StringContent(
                    serializedData,
                    System.Text.Encoding.UTF8,
                    "application/json");

                var result = await client.PostAsync("wallet/triggersmartcontract", requestData);
                resultContent = await result.Content.ReadAsStringAsync();
            }

            var response = JsonConvert.DeserializeObject<TriggerTrc20TokenResponse>(resultContent);   
            Assert.True(response.result.result);
            Assert.NotNull(response.transaction);

            var transaction = response.transaction;
            
            // Sign
            var txId = transaction.txID.FromHexToByteArray();
            Signature signature = wallet0.Sign(txId);
            TronSignature tronSignature = new TronSignature(signature);
            var signatureHex = Helper.ToHexString(tronSignature.SignatureBytes);
            transaction.signature.Add(signatureHex);

            // Broadcast
            using (var client = new HttpClient(){ BaseAddress = new Uri(url)})
            {
                BroadcastHexRequest req = new BroadcastHexRequest()
                {
                    raw_data = JsonConvert.SerializeObject(transaction.raw_data),
                };
                req.signature.Add(transaction.signature.First());

                var serializedData = JsonConvert.SerializeObject(req);
                
                var requestData = new StringContent(serializedData, Encoding.UTF8, "application/json");
                var result = await client.PostAsync("wallet/broadcasttransaction", requestData);
                resultContent = await result.Content.ReadAsStringAsync();

                var broadcastTransactionResponse = JsonConvert.DeserializeObject<BroadcastTransactionResponse>(resultContent);
                Assert.True(broadcastTransactionResponse.result);
            }
        }
    }
}