[Ethereum] How to fork the binance chain

To deploy a contract a signer is required. Using web3 requires the private key for the address to be present in the node. Ensure the account private key is present in the local test node. One way is to constantly start ganache-cli with a set of private keys.

There is an issue in the way the deploy async function is invoked it should be

deploy().then(function(response){ console.log(response)})

You can also switch to ethers.js it's more developer friendly

const { ContractFactory, Wallet, providers } = require('ethers')
const provider = new providers.JsonRpcProvider('http://localhost:8545')
const wallet = new Wallet(privateKey, provider)
async function deployContracts() {
    let token = new ContractFactory(tokenabi, tokenbytecode, wallet)
    // this deploys the contract
    token = await token.deploy()
    // we must wait until it is mined
    token = await token.deployed()
    return token
}

It relies on an external source (fork from) for pre-fork information and then relies on its own block producer and append new blocks after the fork. It will continue to rely on the external source for information about the pre-fork state.

You can use it to test interactions. For example, if you want to run unit tests that interact with a liquidity pool and you want the test to be as realistic as possible. You can fork a chain where these things already exist, then deploy your contract and run interaction scenarios.

Hope it helps.