No. Integrity or identity is not authorization.

Use object storage for large opaque bytes and a metadata database for ownership, lifecycle, searchable attributes, and completion state. CDN caching reduces origin traffic and geographic latency for suitable objects, with explicit cache headers and invalidation/versioning. Multipart upload separates large transfers into retryable pieces; abandoned sessions and orphaned objects need cleanup. Signed URLs are bearer capabilities that should be scoped and time-limited, not exposed as permanent public identifiers for private assets. The course itself uses D1 notebook records and R2 assets as a concrete separation, without claiming those services are interchangeable with every storage workload.

What the function promises: The model stores bytes in an in-memory content-addressed dictionary and creates a separate metadata record. It performs no upload or authorization.

from hashlib import sha256

def store_object(objects, metadata, owner, data):
    key = sha256(data).hexdigest()
    objects.setdefault(key, bytes(data))
    record = {"owner": owner, "key": key, "size": len(data), "status": "ready"}
    metadata.append(record)
    return record

objects, metadata = {}, []
a = store_object(objects, metadata, "Ana", b"hello")
b = store_object(objects, metadata, "Bo", b"hello")
assert a["key"] == b["key"] and len(objects) == 1
assert a["owner"] != b["owner"]

Work and storage: O(byte count) hashing and storage. Identical-content deduplication may create privacy/accounting considerations beyond this example.

When to recognize it: Cache suitable bytes near readers. Private assets still need access checks or bounded signed access; public caching rules must not leak private content.

Check before applying it: Object identity, cacheability, and authorization are separate concerns.

No. Use pending/uploading/verified/ready states and expose only completed objects. Define orphan cleanup for the opposite failure order too.