@MarvinFreeman @aboutsignal @pluralistic Interesting. I see from Wikipedia https://en.wikipedia.org/wiki/Session_(software) :
Session uses the Loki blockchain network for transmissions. In 2021, an independent review by the third-party Quarkslab verified these claims. In 2025, Session announced that it had migrated to its own network, the Session Network — a decentralized, open-source blockchain network designed to transmit encrypted data, specifically for the Session messenger.
I'm not knowledgeable enough to make a call on this. Interested in others' thoughts...