Sandbox

MempoolListener/listener.js

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+import { Network, Alchemy } from 'alchemy-sdk';
+
+// Optional Config object, but defaults to demo api-key and eth-mainnet.
+const settings = {
+  apiKey: '2ayGuJawCT2fsUbqE1q6JLGuddT6A-qe', // Replace with your Alchemy API Key.
+  network: Network.ETH_MAINNET, // Replace with your network.
+};
+
+const alchemy = new Alchemy(settings);
+
+var ethers = require("ethers");
+var url = "wss://eth-mainnet.g.alchemy.com/v2/2ayGuJawCT2fsUbqE1q6JLGuddT6A-qe";
+var init = function () {
+  var customWsProvider = new ethers.providers.WebSocketProvider(url);
+  customWsProvider.on("pending", (tx) => {
+
+    customWsProvider.getTransaction(tx).then(function (transaction) {
+      if (transaction != null){
+        if (transaction.to==="0x1f9840a85d5af5bf1d1762f925bdaddc4201f984"){
+          console.log(transaction);
+        }
+    }
+    });
+}); };
+init();

SHAMEcoin/.gitignore

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+node_modules
+.env
+coverage
+coverage.json
+typechain
+typechain-types
+
+#Hardhat files
+cache
+artifacts
+

SHAMEcoin/README.md

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+# SHAMEcoin
+
+This contract creates 'SHM', a token that is undesirable. Only the contract admin can transfer to a particular address. Only the contract admin can run transferFrom, and only with approval from the address holder. 

SHAMEcoin/contracts/SHAMEcoin.sol

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+// SPDX-License-Identifier: None
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import "@openzeppelin/contracts/access/Ownable.sol";
+
+pragma solidity ^0.8.17;
+
+contract SHAMEcoin is ERC20, Ownable {
+
+    constructor(uint256 initialSupply) ERC20("SHAME", "SHM"){
+    _mint(msg.sender, initialSupply);
+   }
+
+    function decimals() public view override returns (uint8) {
+        return 0;
+    }
+
+    function transfer(address recipient, uint256 amount) public override returns (bool) {
+        require (amount == 1);
+        if (msg.sender == owner()){
+            _transfer(owner(), recipient, 1);
+        }
+        else {
+            _transfer(owner(), msg.sender, 1);
+        }
+        return true;
+    }
+
+    function transferFrom(address shameHodler, address DEAD, uint256 amount) public override returns (bool) {
+        require (msg.sender == owner());
+        uint256 currentAllowance = allowance(shameHodler, owner());
+        require(currentAllowance >= 1, "ERC20: transfer amount exceeds allowance");
+        _burn(shameHodler, 1);
+        _approve(shameHodler, _msgSender(), currentAllowance - 1);
+
+        return true;
+    }
+
+       function approve(address hodler, uint256 amount) public override returns (bool) {
+        require (msg.sender == hodler);
+        _approve(_msgSender(), owner(), amount);
+        return true;
+    }
+
+
+
+}

SHAMEcoin/hardhat.config.js

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+require("@nomicfoundation/hardhat-toolbox");
+
+/** @type import('hardhat/config').HardhatUserConfig */
+module.exports = {
+  solidity: "0.8.17",
+};