Signing and sending a transaction

signAndSendTransaction.js

const Web3 = require("web3");
const web3 = new Web3(new Web3.providers.HttpProvider('https://api.avax-test.network/ext/bc/C/rpc'));

let account = web3.eth.accounts.privateKeyToAccount(yourPrivateKey);
let address = account["address"]; 
let accsign = account["signTransaction"]; // function for signing transactions

chain = {name: "fuji", networkId: 1, chainId: 43113}; //chain information
mycommon = {customChain:chain};

const tx = {
      from: address, 
      to: contractAddress, 
      gas: 200000, 
      data: myContract.methods.setAddresses(MetaDataAddress, BINAddress).encodeABI(),
      common: mycommon
    };
  accsign(tx)
    .then((val) => {web3.eth.sendSignedTransaction(val["rawTransaction"]);})