Thank you very much for this (and all other articles) Alexander! We (web2 devs) definitely need more and would greatly benefit from these, since they're short, to-the-point, with complete code and tests! And it's not just algopy, that's demonstrated, but a lot of crypto related concepts (e.g. Merkle Trees, Hashed Timelock Contracts) which web2 folks rarely (if ever) use.