Hackers' Pub

Syntax	Description	Examples
`"` keyword `"`	Finds the string within quotes, including spaces. Case-insensitive. (Escape quotes inside with `\"`)	`"Hackers' Pub"`
`from:` handle	Finds content written by the specified user.	`from:hongminhee` `from:hongminhee@hollo.social`
`lang:` ISO 639-1	Finds content written in the specified language.	`lang:en`
`#` tag	Finds content with the specified tag. Case-insensitive.	`#HackersPub`
condition condition	Finds content that satisfies both conditions on either side of the space (logical AND).	`"Hackers' Pub" lang:en`
condition `OR` condition	Finds content that satisfies at least one of the conditions on either side of the OR operator (logical OR).	`#HackersPub OR "Hackers' Pub" lang:en`
`(` condition `)`	Combines the operators within the parentheses first.	`(#HackersPub OR "Hackers' Pub" OR "Hackers Pub") lang:en`

@reiver ⊼ (Charles) @reiver@mastodon.social

1/23/2026, 3:55:35 PM

Public

All that requires that a Fediverse user can have multiple public-keys specified for them.

...

Although https://w3id.org/security/v1 seems to allow for multiple public-keys —

I wonder how much Fediverse software could actually handle multiple public-keys (rather than just one)?

(And, don't just assume one public-key?)

How mucg Fediverse software could handle public-keys changing over time?

Etc?

#ActivityPub #Cryptography #Fedidev #Fedidevs #Fediverse #JSONLD

Julian Fietkau @julian@fietkau.social

1/23/2026, 6:22:27 PM

Public

@reiver@reiver ⊼ (Charles) From personal experience, at the very least anything based on @fedifyFedify: ActivityPub server framework can represent multiple keys for an actor.

FEP-521a has a list of implementations: https://codeberg.org/fediverse/fep/src/branch/main/fep/521a/fep-521a.md#implementations

On changing keys, I used to think this was impossible, but then I saw Claire mention that Mastodon will simply accept a changed key as long as the valid updated actor can be fetched from its canonical URI. So I guess that might work straightforwardly?

Summary card of repository fediverse/fep, described as: Fediverse Enhancement Proposals

fep/fep/521a/fep-521a.md at main

fep - Fediverse Enhancement Proposals

codeberg.org · Codeberg.org

If you have a fediverse account, you can quote this note from your own instance. Search https://fietkau.social/users/julian/statuses/115945802783532616 on your instance and quote it. (Note that quoting is not supported in Mastodon.)