Nice, I have implemented the same spec in

GitHub

GitHub - flox1an/almond: A temporary BLOSSOM file storage service with Nostr-based authorization and web of trust support.

A temporary BLOSSOM file storage service with Nostr-based authorization and web of trust support. - flox1an/almond

(when FEATURE_CUSTOM_UPSTREAM_ORIGIN_ENABLED is set) independently to operate as an edge caching server.