The thing that most consistently excites me about Ethereum is that it's this big shared playground for experimenting with novel combinations of mechanism design and cryptography.

What is the most interesting new mechanism or cryptographic primitive you've seen recently?

Playing around with the webauthn + secp256r1 smart wallets to have pretty effortless sponsored transactions and portable accounts you can set up on a mobile device has been pretty game changing for me, be interesting to see if it actually gets much adoption compared to current AA options and if ithaca's odyssey net does anything to help that, among other AA eips

Have wondered about this as a safe module