I’ve had a passing interest in zero knowledge proofs for a long time, when I first heard of them they felt more like magic than cryptography. I learn best with a project but I hadn’t had any practical need to implement anything with zero knowledge proofs until:

I got nerd sniped by this tweet. @boredGenius got extremely close to pulling off an sstore2 modification to allow rewriting to the same key but had two issues that stopped them from wrapping it up. Nonces and selfdestruct ordering.