TRACKING AND VERIFYING AUTHENTICITY OF ITEMS

Disclosed are various embodiments for tracking and verifying the authenticity of items. Public and private unique identifiers are generated for an item, and an identifier label is printed and affixed to the item. The public identifier is visible, but the private identifier is not visible unless a tamper-evident action is performed. Events involving scans of the public identifier are recorded. The private identifier is scanned by a client, and in response, authenticity information for the item is sent to the client. The authenticity information is determined based at least in part on the events relative to the public identifier.