Or use crypto. Generate keypairs, sign updates. Add support for delegating updates to other instances.
Maybe add support for having instances getting data to indicate if they’re willing to relay update data to others, and have main instance refer to them for a certain time period, say… 6 hours maybe?
Relay willingness would depend on instance config and load, ideally.
Edit: any reason I’m getting down votes? If there is a problem with the approach, at least leave a comment.
Edit2: Crypto as in CRYPTOGRAPHY! Which has been shortened to crypto since long before bitcoin was invented. If this was some non-tech forum I could understand, but a community about self hosting and no one seems to be making the obvious connection? Wow. And you guys host stuff, that’s just scary.