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Bluesky has gained a million new users in the last three days. (www.theverge.com)

submitted 2 months ago by [email protected] to c/[email protected]

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Bluesky has gained a million new users in the last three days.

The platform posted about the milestone this afternoon, which it crossed after Brazilian Supreme Court Justice Alexandre de Moraes ordered a ban on Elon Musk’s X yesterday as part of an ongoing feud with the platform.

Apparently, enough are headed to Bluesky to drive its iOS app to the top of the Brazilian App Store, as TechCrunch writes.

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[–] [email protected] 2 points 2 months ago (3 children)

But what if the server that holds the cryptographic keys is suddenly gone? Then what?

Or does Bluesky use client-held keys? I just think client-held private keys is probably too complicated for most people to realistically and safely use.

[–] [email protected] 1 points 2 months ago* (last edited 2 months ago) (2 children)

I assume you hold your own cryptographic keys, but I'm not actually sure how that works. Your client needs access to them to make posts, and it wouldn't make sense for the server to hold your private key, since that would mean the owner of your instance could make posts as you.

I haven't actually signed up to BlueSky to figure this out yet.

Edit: So it looks like users are authenticated using https://github.com/did-method-plc/did-method-plc But the keys are stored on the server, with an option to view your key for backup and migration. That does mean a certain level of trust with your instance, but you can self-host if that's a concern. A malicious host at least can't prevent you from rotating your keys and leaving (unless of course they steal your account entirely by rotating your keys themselves)

[–] [email protected] 1 points 2 months ago (1 children)

it wouldn’t make sense for the server to hold your private key, since that would mean the owner of your instance could make posts as you.

I mean, this is quite normal and common for all traditional social media (or any site really) you sign up for. It's what most ActivityPub instances do too, though there's nothing in ActivityPub that requires the server to hold the private key. It could in principle be held by the client but I don't believe there is any implementation that does that currently.

[–] [email protected] 1 points 2 months ago

Yeah, this is just me tacking on extra features I'd like. My security-minded programmer brain can't help but think of all the edge-cases. It's something that is suddenly possible with distributed social media that never was before.