http://uwb25d43nnzerbozmtviwn7unn7ku226tpsjyhy5n4st5cf3d4mtflqd.onion/posts/e2ee/index.html
Even if the message itself is encrypted, metadata can reveal who is communicating with whom, when, how often, the sizes of any files that may have been transferred, and so on. Metadata exposure is a major concern . Peer-to-peer means that the messages do not pass through a centralized server.