http://nsforum.i2p/topic?uid=077eaf21-0eb8-4388-bfb9-d82d98255ae8
Partial username search, recommendations, and a global account list are not used. > Encryption Messages and private keys are encrypted in the browser before being sent to the server. The server stores only encrypted data: message ciphertext, the user’s encrypted keyring, public keys, and the minimum required service metadata.