Capability-based security

Reviving an old thread from Sylvain and JB Lemée here: https://git.happy-dev.fr/startinblox/solid-spec/issues/6

• Discussions in the context of ActivityPub: https://blog.dereferenced.org/what-would-activitypub-look-like-with-capability-based-security-anyway
• About Capabilities: http://srl.cs.jhu.edu/pubs/SRL2003-02.pdf
• ACLs don't: http://waterken.sourceforge.net/aclsdont/current.pdf

I found Goblins, a library which implements Capability Transport Protocol in Racket

I also saw some old conversations in Solid issues that don't seem to have gone anywhere. Not sure how this crosses over with the efforts in data-access-grants