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REQUIREMENTS:

  1. Create an ERC20 Contract with a black list of wallets which are not allowed to transfer tokens
  2. Create a node.js script which can add wallets to the blacklist (wallet address is a parameter)
  3. The node.js script output should be able to show a list of blacklisted wallets in the ERC20 Contract
  • deploy on any testnet of your choice
  • use any SDK of your choice
  • calculate gas fees in case we want to blacklist 1000 wallets a day
  • write tests

APPROACH:

ERC20 contract: Contracts folder / OPToken.sol

Script NodeJS: Folder script / blacklist.js

Script Add 1000 Wallet and view cost: Folder script / generate1000Address.js

Test contract: Test / OPToken_test.sol folder

Blockchain Net: Mumbai (Polygon Testnet)

Contract Deployed and Verified: 0xeafA2a9336fc936F196e834CcaF8fe29e01deb1A

I have not used any development environment like Hardhat or Foundry to avoid weighting the project, I have used remix to deploy the contract.

I have also done these functional tests on the deployed contract:

https://mumbai.polygonscan.com/address/0xA7B7123987A9DBcCe84C2f08dBAaD031BA839eC4

Contract Address v1: 0xA7B7123987A9DBcCe84C2f08dBAaD031BA839eC4 Contract Address v2 Final: 0xA7B7123987A9DBcCe84C2f08dBAaD031BA839eC4

  • I have minted 1000 OPToken tokens. ✅
  • I have burned 100 OPToken tokens. ✅
  • I have added the 0x60f3c9C7bc50D8A6FBEbb6BFCb882E24534b3F86 wallet to the blacklist ✅
  • I have removed the 0x60f3c9C7bc50D8A6FBEbb6BFCb882E24534b3F86 wallet to the blacklist ✅

Test Result

The estimated cost per transaction of adding a wallet to the Blacklist is:

Manual estimate based on the cost of a transaction.

1 Transaction: 0.00016886257953256 MATIC 1000 Transactions: 0.168886257953256 MATIC 1 Matic = 0.86 USD Estimated 1000Tx/Day: 0.1452218 USD

Automatic estimation by executing the generate1000Address script 1 to 1

1000 Tx/Day: 2377200000.0 gwei 2,377,200,000.0 gwei = 2,377,200,000.0/10^9 MATIC The estimated transaction cost of 2,377,200,000.0 gwei equals approximately 2.04 USD *, considering that 1 MATIC equals 0.86 USD.

generate1000Address execution

Automatic estimation by executing the generate1000Address script 1000 using the function Add Multiple To Black List

I have not been able to finish this estimation because I do not have enough funds to do the test and the Mumbai faucet does not give me more until tomorrow.

  • Estimates made on the Mumbai test network, on Polygon's Mainnet may vary.
Author: Antonio Maroto

NOTICE: .ens file needed to check operation not included, sending method: email