BlobAuditRecorder could be a better name for this...

But I also agree that audit ability was just a _thing to keep in mind_ and not an intitial requriement.  Though good to get a step a head as I think audit trail for this will be important.  But I'm also not sure how it would work or if it would hook inot another system or be specific to blobs etc.

Where is BlobAuditStore actually used?