--- title: "Marcin Zduniak (@mz7mz7mz7) | Hashnode" description: "Blockchain CTO. Read the latest articles by Marcin Zduniak on Hashnode." url: "https://hashnode.com/@mz7mz7mz7" --- @mz7mz7mz7 # Marcin Zduniak @mz7mz7mz7 · Joined November 2023 Blockchain CTO ### [Drone Programming basics](https://zduniak.com/drone-programming-basics?utm_source=hashnode&utm_medium=feed) https://youtu.be/LmEcyQnfpDA?si=RAaITicNLVnbfR-P 1 min read · [zduniak.com](https://zduniak.com/drone-programming-basics?utm_source=hashnode&utm_medium=feed) [May 21, 2024](https://hashnode.com/posts/drone-programming-basics/66a8a02b69843c0a50907516) ### [Solana learning materials](https://zduniak.com/solana-learning-materials?utm_source=hashnode&utm_medium=feed) Solana Frontend Crash Course presentation Solana tech videos 1 min read · [zduniak.com](https://zduniak.com/solana-learning-materials?utm_source=hashnode&utm_medium=feed) [May 5, 2024](https://hashnode.com/posts/solana-learning-materials/66a89faa69843c0a50907509) ### [Restricting access to the website to certain sanctioned countries](https://zduniak.com/restricting-access-to-the-website-to-certain-sanctioned-countries?utm_source=hashnode&utm_medium=feed) Often, in my projects, there is a need to somehow block access to some parts of the application to people connected from certain sanctioned or otherwise restricted jurisdictions. Doing it on the front end is usually not the best approach, but often, ... 2 min read · [zduniak.com](https://zduniak.com/restricting-access-to-the-website-to-certain-sanctioned-countries?utm_source=hashnode&utm_medium=feed) [Dec 5, 2023](https://hashnode.com/posts/restricting-access-to-the-website-to-certain-sanctioned-countries/656f596f7b8758b1e6bb9fea) ### [Account Abstraction resources](https://zduniak.com/account-abstraction-resources?utm_source=hashnode&utm_medium=feed) I have been studying quite a lot about Account abstraction and ERC-4337 recently. I will point out here some resources worth reviewing: Walk through a thinking process of arriving at the current AA design, showing which problems had to be resolved a... 1 min read · [zduniak.com](https://zduniak.com/account-abstraction-resources?utm_source=hashnode&utm_medium=feed) [Nov 30, 2023](https://hashnode.com/posts/account-abstraction-resources/659bec005a4e8ea97b090d00) ### [Blockchain Fintech: History of innovation](https://zduniak.com/blockchain-fintech-history-of-innovation?utm_source=hashnode&utm_medium=feed) Innovations come to existence through different means and circumstances. Some of them start as meticulously planned inventions. Others – due to pure luck and uncontrollable external conditions. It’s never just one source that transforms promising inn... 7 min read · [zduniak.com](https://zduniak.com/blockchain-fintech-history-of-innovation?utm_source=hashnode&utm_medium=feed) [Aug 1, 2018](https://hashnode.com/posts/blockchain-fintech-history-of-innovation/659545b1c2712dfcea8f8db4)