Personally I'm very excited to see what applications will be developed at the hackathon at the OSFC conference, and onwards. We have had people at the conference showing interest in trying to write applications in Rust. I will try and implement an application of my own tomorrow.
TOTP, FIDO2, PIV, simple touch triggered challenge/response... or something completely different. If it can fit in around 100 kByte RAM when compiled for RV32IMC and not be too computationally expensive, it could be a Tillitis app.
Just to give you some indication, the Ed25519 signer operation in the SSH authentication we showed on stage today takes ~ one second to perform the signing. And we have several ways to improve that we know already.
