Abstract: Methods and systems for verifying authenticity of a physical object and/or for verifying possession of the object by an individual are described. In one embodiment, the object is registered with a remote processing system. Data representing at least one characteristic of the object is obtained and stored in the remote system and the identity of the individual or entity possessing the object is authenticated. After authenticating the individual, an identifier is collocated (or an existing mechanism is activated or modified to replicate the identifier) with the object, where the identifier uniquely identifies the object and the individual possessing the object. The object and the identity of the individual possessing the object can be authenticated at a future time by sensing the collocated identifier and sending the sensed identifier to the remote system. The remote system can send instructions to an entity wishing to authenticate the object and its association with the individual possessing the object.