This is the second post of a total of five, for the CaptureTheEther CTF writeups. This time, the focus will be on the Lotteries category of challenges. Most levels here will require the player to code and deploy new contracts to the network, and interact with them.

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This is the first post in a series about the Ethereum security introductory CTF "CaptureTheEther". There will be a total of five posts, each one of them focused in one of the categories of the game. For each level I'll describe the contract, the vulnerability, the solution I used and a conclusion about what …

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