Disturbia on Nostr: Imagine a conditional transaction that uses nostr as an intermediary. Example: Buying ...

Imagine a conditional transaction that uses nostr as an intermediary.

Example:

Buying a physical item (let just say it is a bag) online.

The seller produce a business receipt via nostr. The seller pays it via lightning but it goes into a pending transaction. The seller provides a postage tracking number.

Item received.
Buyer sign / confirm transaction and the payment routed to seller.

Is it possible?