tronWeb seems to have problems with off-line signing.

[hackfisher]

https://github.com/tronprotocol/tron-web/issues/104

[hackfisher]

https://github.com/tronprotocol/tron-web/blob/master/src/lib/contract/method.js#L30

[hackfisher]

https://github.com/tronprotocol/tron-web/blob/master/src/lib/contract/method.js#L163

const address = privateKey ? this.tronWeb.address.fromPrivateKey(privateKey) : this.tronWeb.defaultAddress.base58;
            const transaction = await this.tronWeb.transactionBuilder.triggerSmartContract(
                this.contract.address,
                this.functionSelector,
                options.feeLimit,
                options.callValue,
                parameters,
                this.tronWeb.address.toHex(address)
            );

            if (!transaction.result || !transaction.result.result)
                return callback('Unknown error: ' + JSON.stringify(transaction, null, 2));

            // If privateKey is false, this won't be signed here. We assume sign functionality will be replaced.
            const signedTransaction = await this.tronWeb.trx.sign(transaction.transaction, privateKey);

            if (!signedTransaction.signature) {
                if (!privateKey)
                    return callback('Transaction was not signed properly');
                
                return callback('Invalid private key provided');
            }

            const broadcast = await this.tronWeb.trx.sendRawTransaction(signedTransaction);

[hackfisher]

unsigned contract sample

{
    "result": {
        "result": true
    },
    "txid": "89b6d57aa1502f39a427a0b0509fb93efe0de4511f122db565f40b560e05286a",
    "transaction": {
        "txID": "a11f18168598d912b43abdf102d098da1bf753c073f9718db30a50423d0f75bb",
        "raw_data": {
            "contract": [
                {
                    "parameter": {
                        "value": {
                            "data": "be45fd62000000000000000000000000c29b9bfba00ec2a2fb0b9d881c7924b89299cbf40000000000000000000000000000000000000000000000000de0b6b3a7640000000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000001",
                            "owner_address": "41d25da92f48c771e1f62e9b62b514cdd05fef9abb",
                            "contract_address": "4130f6395b0759f55918cd6dc35d84837734dd032c"
                        },
                        "type_url": "type.googleapis.com/protocol.TriggerSmartContract"
                    },
                    "type": "TriggerSmartContract"
                }
            ],
            "ref_block_bytes": "1ae3",
            "ref_block_hash": "9286615879a965bb",
            "expiration": 1544696310000,
            "fee_limit": 1000000000,
            "timestamp": 1544696252318
        }
    }
}

[hackfisher]

Tron do not have nonce, so require to fetch the latest block's ref_block_hash and ref_block_bytes for the online network.

[hackfisher]

transaction with callValue:

{
  "result": true,
  "transaction": {
    "txID": "90b86d51c6b9b8802453f32697b000748e298911ba92dc4bbe338768e3bd8ed1",
    "raw_data": {
      "contract": [
        {
          "parameter": {
            "value": {
              "data": "be45fd62000000000000000000000000ec0842c56304a4679c5417d9347ad0072b3f61cb0000000000000000000000000000000000000000000000000de0b6b3a7640000000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000001",
              "owner_address": "41d25da92f48c771e1f62e9b62b514cdd05fef9abb",
              "contract_address": "41740e99def7e22b56baf4f9d3102f11bf992e1a1d",
              "call_value": 1111
            },
            "type_url": "type.googleapis.com/protocol.TriggerSmartContract"
          },
          "type": "TriggerSmartContract"
        }
      ],
      "ref_block_bytes": "ae71",
      "ref_block_hash": "12c921b9e78d9aea",
      "expiration": 1545473388000,
      "fee_limit": 1000000000,
      "timestamp": 1545473329342
    },
    "signature": [
      "f4fd1cf078975b485f586f79cb950dc7e0899380d71683a93a52d6630457c613a44a2a866b05f3692ecb0acb2f71d66d0fe9498fe53a513b78823d1fcfed460800"
    ]
  }
}