Inbox (Linked Data Notifications / ActivityPub)

Usecase:

• User agrees to datadeal, should receive email, but the email is unknown to the pod with the datadeal, so the mail cannot be sent
• Store incoming datadeals from broker
• Store messages from broker sent for some agreement
• Chat!

Activitypub / LDN

• ActivityPub has outbox (useful)
• LDN seems to combine a couple of these. But it's subtly different.
• There's also a solid spec, but it's still very drafty. Ignore for now.