Token asks us to hack the basic token contract supplied. We start with 20 tokens and our objective is to get our hands on more. We are given a hint that an odometer might be of help so let’s start by looking it up.An odometer is the mile tracker in your car that the numbers […]
Token | Ethernaut Level 5 Walk-Through Read More »
EVM puzzles gives us byte code and asks us for a value that will succeed as a transaction. If you missed my original post that goes more in detail about how to decipher the Opcodes and the tools we are using, see it here. Puzzle 2 introduces us to some new Opcodes, as well as
EVM Puzzles 2 Walk-Through Read More »
Telephone asks us to claim ownership of the contract. Learn the difference between tx.origin and msg.sender. It supplies us with the following source code: The contract seems simple enough, with just one function changeOwner we can see the requirements for claiming ownership: It seems that tx.origin can not (!=) equal the msg.sender. So let’s head
Telephone | Ethernaut Level 4 Walk-Through Read More »
10 consecutive correct guesses on a coin flip? There is a tiny chance we are gonna have to work the system. We are given the source code of the contract, it tracks consecutiveWins and has a flip function that takes in a bool _guess and returns a bool for heads or tails. Let’s take a
Coin Flip | Ethernaut Level 3 Walk-Through Read More »
Fallout or FAL1OUT as the hint in the image says, has an error in the code that incorrectly implements a constructor that leads to ownership transfer by any public address interacting with a specific function. This is the first level that suggests we try Solidity’s Remix IDE, a fully web based IDE for solidity with
Fallout | OpenZeppelin Ethernaut Level 2 Walk-Through Read More »
EVM Puzzles is a GitHub repo from fvictorio containing a collection of puzzles to teach how the EVM operates. For each challenge we are supplied with the bytecode of the contract, the objective is to send a successful transaction. In some puzzles you only need to provide the value that will be sent to the
How to Solve EVM Puzzles Read More »
Level 1 “Fallback” gives us the source code of a contract, to beat the level we must claim ownership of the contract and drain it’s balance to 0. Using the Get new instance button, we deploy our contract. Take a look over the Solidity smart contract code: First things first, we need to claim ownership
Fallback | OpenZeppelin Ethernaut Level 1 Walk-Through Read More »
This is the first in the Ethernaut write-up series by CAPS LOCK DAVE.LEVEL 0 CAN BE FOUND HERE This level serves as the tutorial and guides us through the setup needed to participate in the CTF. We need: Connecting our MetaMask wallet will allow us to track our progress and create a new instance of
Hello Ethernaut | OpenZeppelin Ethernaut Level 0 Walk-Through Read More »