If you find this project interesting, please consider voting for it in the CoinList Hackathon project page: Mizu - CoinList
Mizu is an experiment to explore what secure, private, and asynchronous messaging might look like when backed by a decentralized store (Tezos). Mizu is similar to email combined with PGP, while being forward secret and tries to reduce information leakage, similar to Pond.
DISCLAIMER: The design and implementation of Mizu is done by non-cryptographers who have not had substantial experience designing or implementing security-critical communication protocols. Please do not use this for anything real yet.
Watch a brief video of what Mizu currently looks like: Mizu DemonstrationAcknowledgements
Thanks to Shiho Midorikawa from Cybozu Labs for helpful suggestions and discussion.