Proof of concept: sharded, encrypted file storage between peers on the Yggdrasil overlay, with no VPN coordinator: node IDs come from public keys, each node only answers group members, and storage challenges check that peers still hold what they were given.
The idea: people in a group lend each other disk space. Each file is encrypted, cut into pieces and spread over everyone's machines, so it survives any one machine failing. The small stub left behind holds the key, so sending someone a stub (sealed for them, by email or anything else) is a way to send them the file, with no cloud service in between.
Status: experimental. The cryptography has not been reviewed by anyone independent. Don't make it the only copy of anything you can't lose.
