[jraph]

Not at all like Signal. They only have your account creation time and your last connection time

https://signal.org/blog/looking-back-as-the-world-moves-forw...

(edit: answering to your initial message, that said that Signal operators also have access to the same metadata, but I guess my comment still answers your sentence "Most important is who when with who which both leak to the server operators" - Signal operators have showed they can't provide this information)

[cfhhgtyg]

If you don't store that data or delete it, you can't provide it.

But Signal could store that data because they have access to that dats

[jraph]

> If you don't store that data or delete it, you can't provide it.

Can I do this easily and still have my homeserver work correctly with Matrix?

Anyway, the law would probably require any operator to keep this data for a while since they have access to it. And I can't rely on my contact's homeservers to delete this data even if they can (technically and legally).

[cfhhgtyg]

Signal certeinly can store it, because they have access to it.

They have access to that data alone through the fact that they are in control of their servers and, thus, can see who sends and receives messages.

[jraph]

But they can't. That's the thing.

https://signal.org/blog/sealed-sender/

[cfhhgtyg]

They can.

Even on a theoretical level their sealed sender technique doesn't work: https://www.ndss-symposium.org/ndss-paper/improving-signals-...

Now, include lower level technical Details such as the IP layer.

1. Imagine you connect to a server to send a message. Now, you send a message to someone else. The server can't see who you are, right? Because the letter misses your name. Imagine someone else sends a message to you.

2. Imagine you to connect to the same server to receive messages that the server stored for delivery with your name on it. The server gives you the messages.

Do you notice something?

[jraph]

Okay, maybe Signal has access to this information with sufficient investigation then.