var rawTransaction = {
      "from": callerAddress,
      "gasPrice": gasParams[0], //always 0 for SKALE
      "gasLimit": gasParams[1], //always 8MM for SKALE
      "to": contractAddr,
      "data": encodedFunction[1],
      "nonce": web3.utils.toHex(nonce)
    }

    var transaction = new EthereumTx(rawTransaction);

    const privateKeyBuffer = Buffer.from(privateKey, 'hex');

    //signing transaction with private key
    await transaction.sign(privateKeyBuffer);

    console.log("trying to call contract...")

    return new Promise(async (resolve, reject) => {

      //sending transaction via web3js
      web3
      .eth
      .sendSignedTransaction('0x' + transaction.serialize().toString('hex'))
      .on('receipt', (receipt) => {

        resolve({"code": 200, "result": receipt})

      })
      .on('error', (error) => {

        console.log(error)
        resolve({"code": 500, "result": error})

      })