In this post, I will share my explanations for the Lottery section of the Capture The Ether challenges. There are plenty of solutions around the web - my goal was to solve the challenges locally, avoiding Etherscan when possible, and writing code locally. You can find the code here. Let’s begin.Guess The NumberThis is very similar to the warmup challenges. In the code, you will find the script guessTheNumber.js. The code has comments explaining what each line does. Still, here is what we need...

In this post, I will share my explanations for the Lottery section of the Capture The Ether challenges. There are plenty of solutions around the web - my goal was to solve the challenges locally, avoiding Etherscan when possible, and writing code locally. You can find the code here. Let’s begin.Guess The NumberThis is very similar to the warmup challenges. In the code, you will find the script guessTheNumber.js. The code has comments explaining what each line does. Still, here is what we need...

In this post, I will share my explanations for the Math section of the Capture The Ether challenges. There are plenty of solutions around the web - my goal was to solve the challenges locally, avoiding Etherscan when possible, and writing code locally. You can find the code here. Let’s begin.Token SaleLooking at the contract, it may seem like everything is correct. However, if you look closely, you'll see that this contract does not implement SafeMath. Remember, SafeMath is implemented o...

In this post, I will share my explanations for the Math section of the Capture The Ether challenges. There are plenty of solutions around the web - my goal was to solve the challenges locally, avoiding Etherscan when possible, and writing code locally. You can find the code here. Let’s begin.Token SaleLooking at the contract, it may seem like everything is correct. However, if you look closely, you'll see that this contract does not implement SafeMath. Remember, SafeMath is implemented o...

In this post, I will share my explanations for the Miscellaneous section of the Capture The Ether challenges. There are plenty of solutions around the web - my goal was to solve the challenges locally, avoiding Etherscan when possible, and writing code locally. You can find the code here. Let’s begin.Assume OwnershipThis challenge might be the easiest. Solidity now allows you to use the constructor keyword so constructors stand out. However, the challenge contract doesn't use that keywor...

In this post, I will share my explanations for the Miscellaneous section of the Capture The Ether challenges. There are plenty of solutions around the web - my goal was to solve the challenges locally, avoiding Etherscan when possible, and writing code locally. You can find the code here. Let’s begin.Assume OwnershipThis challenge might be the easiest. Solidity now allows you to use the constructor keyword so constructors stand out. However, the challenge contract doesn't use that keywor...

In this post, I will share my explanations for DamnVulnerableDeFI challenges 1 through 5. You can find the code here. Let’s begin.UnstoppableIf you're like me, your first instinct might be to drain the pool. However, as you read through the contracts, you'll hopefully realize that there's a much easier way to stop the pool from giving out flashloans. Let's start with the ReceiverUnstoppable contract. It has two functions receiveTokens(...) which, as the comment says, will ...

In this post, I will share my explanations for DamnVulnerableDeFI challenges 1 through 5. You can find the code here. Let’s begin.UnstoppableIf you're like me, your first instinct might be to drain the pool. However, as you read through the contracts, you'll hopefully realize that there's a much easier way to stop the pool from giving out flashloans. Let's start with the ReceiverUnstoppable contract. It has two functions receiveTokens(...) which, as the comment says, will ...

In this post, I will share my explanations for the Account section of the Capture The Ether challenges. There are plenty of solutions around the web - my goal was to solve the challenges locally, avoiding Etherscan when possible, and writing code locally. You can find the code here. Let’s begin.Fuzzy IdentityTo solve this challenge we need successfully authenticate as "smarx". The challenge gives us the conditions we need to meet:Have a contract that returns "smarx" when the function name is ...

In this post, I will share my explanations for the Account section of the Capture The Ether challenges. There are plenty of solutions around the web - my goal was to solve the challenges locally, avoiding Etherscan when possible, and writing code locally. You can find the code here. Let’s begin.Fuzzy IdentityTo solve this challenge we need successfully authenticate as "smarx". The challenge gives us the conditions we need to meet:Have a contract that returns "smarx" when the function name is ...

In this post, I will share my explanations for the Warmup section of the Capture The Ether challenges. There are plenty of solutions around the web - my goal was to solve the challenges locally, avoiding Etherscan when possible, and writing code locally. You can find the code here. Let’s begin.Call Me / Set NicknameCall Me and Set Nickname are very similar, so there is code only for the more complex one - Set Nickname. In the code, you will find the script setNickname.js. The code has comment...

In this post, I will share my explanations for the Warmup section of the Capture The Ether challenges. There are plenty of solutions around the web - my goal was to solve the challenges locally, avoiding Etherscan when possible, and writing code locally. You can find the code here. Let’s begin.Call Me / Set NicknameCall Me and Set Nickname are very similar, so there is code only for the more complex one - Set Nickname. In the code, you will find the script setNickname.js. The code has comment...

In this post, I will share my explanations for DamnVulnerableDeFI challenges 6 through 10. You can find the code here. Let’s begin.SelfieAs per usual, this challenge involves a pool providing flash loans of 1.5 million DVT tokens. Our goal is to take them all. Fortunately, we can immediately see that the pool has a drainAllFunds(...) function, which sends all pool DVT tokens to the address passed as a parameter. Unfortunately for us, it can only be called by governance. SelfiePool is the firs...

In this post, I will share my explanations for DamnVulnerableDeFI challenges 6 through 10. You can find the code here. Let’s begin.SelfieAs per usual, this challenge involves a pool providing flash loans of 1.5 million DVT tokens. Our goal is to take them all. Fortunately, we can immediately see that the pool has a drainAllFunds(...) function, which sends all pool DVT tokens to the address passed as a parameter. Unfortunately for us, it can only be called by governance. SelfiePool is the firs...