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missing-root They store messages in a blockchain, which makes no sense.
Your statement is incorrect. Please read through the app's website, especially https://getsession.org/faq. Under the "Messaging" section in the link is the question Are my messages stored on a blockchain? and the answer to it is No, your messages are not stored on a blockchain. Messages are stored by swarms, and are deleted after a fixed amount of time (called the “time-to-live”, or TTL). All of your messages are encrypted, and can only be decrypted using the private key which is stored locally on your device.