Storage providers and B2

Storage is an interface behind publication; canonical identity never depends on one vendor.

Immutable keys

The hosted service uses an ASOStorageProvider implementation compatible with Backblaze B2's S3 API. It writes representations and manifests to immutable keys, checks collisions, supports bounded staging reads, and emits public URLs.

Migration and portability

To migrate, copy verified bytes, retain every manifest and exact URL mapping, and verify all SHA-256 SRI values before switching origins. Never rewrite a published manifest in place; publish a new semantic version if references change.