--- title: "Osman Ozdemir (@osmanozdemir1) | Hashnode" description: "Osman Ozdemir (@osmanozdemir1) writes on Hashnode. Read their latest articles and follow their work." url: "https://hashnode.com/@osmanozdemir1" --- @osmanozdemir1 # Osman Ozdemir @osmanozdemir1 · Joined April 2022 ### [Ethernaut Challenges: Part III (22-28)](https://osmanozdemir.hashnode.dev/ethernaut-challenges-part-iii-22-28?utm_source=hashnode&utm_medium=feed) Hey! Welcome to the last blog post of the series. Let's dive into it straight away. 22 - Dex Dex contract has 2 different ERC20 tokens and the balances of these tokens are 100 each. We have to withdraw all the balance of one of the tokens and make th... 13 min read · [osmanozdemir.hashnode.dev](https://osmanozdemir.hashnode.dev/ethernaut-challenges-part-iii-22-28?utm_source=hashnode&utm_medium=feed) [Apr 6, 2023](https://hashnode.com/posts/ethernaut-challenges-part-iii-22-28/642eab6e50b8e0baf3c7e4a1) ### [Journey to Auditing: Monthly Recap - March 2023](https://osmanozdemir.hashnode.dev/journey-to-auditing-monthly-recap-march-2023?utm_source=hashnode&utm_medium=feed) Hi everyone!I have been learning smart contract programming for a while and have been sharing my process on my blog. To this point, I was writing blog posts about weekly projects or the solutions to the CTFs, but not about my progress. I decided to s... 4 min read · [osmanozdemir.hashnode.dev](https://osmanozdemir.hashnode.dev/journey-to-auditing-monthly-recap-march-2023?utm_source=hashnode&utm_medium=feed) [Apr 3, 2023](https://hashnode.com/posts/journey-to-auditing-monthly-recap-march-2023/642b41820e0422792d5ae028) ### [Ethernaut Challenges: Part II (13-21)](https://osmanozdemir.hashnode.dev/ethernaut-challenges-part-ii-13-21?utm_source=hashnode&utm_medium=feed) Hi, and welcome back. Let's get to it right away. 13 - Gatekeeper One What a sweet challenge this is, isn't it? We have to pass three gates to complete this challenge. The first one was the easiest, and we already know how to handle tx.origin != msg.... 14 min read · [osmanozdemir.hashnode.dev](https://osmanozdemir.hashnode.dev/ethernaut-challenges-part-ii-13-21?utm_source=hashnode&utm_medium=feed) [Mar 28, 2023](https://hashnode.com/posts/ethernaut-challenges-part-ii-13-21/642315054af4c72ddaf04674) ### [Ethernaut Challenges: Part I (0-12)](https://osmanozdemir.hashnode.dev/ethernaut-challenges-part-i-0-12?utm_source=hashnode&utm_medium=feed) Hello everyone, I hope you are well :) Recently I started to study Ethernaut challenges and I will write a blog series about it. Ethernaut is a wargame to learn smart contract programming in terms of security, and for every challenge, there is a smar... 17 min read · [osmanozdemir.hashnode.dev](https://osmanozdemir.hashnode.dev/ethernaut-challenges-part-i-0-12?utm_source=hashnode&utm_medium=feed) [Mar 22, 2023](https://hashnode.com/posts/ethernaut-challenges-part-i-0-12/641adb469bd134cdb422d0fb) ### [A Health Care dApp: Proof of Consent](https://osmanozdemir.hashnode.dev/a-health-care-dapp-proof-of-consent?utm_source=hashnode&utm_medium=feed) My Final Project for Alchemy University 12 min read · [osmanozdemir.hashnode.dev](https://osmanozdemir.hashnode.dev/a-health-care-dapp-proof-of-consent?utm_source=hashnode&utm_medium=feed) [Mar 4, 2023](https://hashnode.com/posts/a-health-care-dapp-proof-of-consent/64029a6520aa1b83e0b20b0a)