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Are you aware of matrix? Their olm encryption scheme is capable of PFS, but it's not used exactly in order to provide history.

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Yes I'm aware of matrix. A couple of things that I don't like about the matrix protocol are: 1. identity is tied to a server and users are not free to move between servers. 2. servers are assumed to be always online and have low latency.

1. There is work to fix the identity problem with Identity Servers. See https://matrix.org/faq/#what-is-an-identity-server%3F

2. I'm not sure what gives this impression? I have a server that is very much on flaky network, and it federates just fine. The point is that servers can go online/offline without breaking anything on the whole network.

There is a proposal for decentralized user accounts: https://github.com/matrix-org/matrix-doc/issues/915

There's also megaolm. Megaolm seems to be scaling better than other production setups, in practice.

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