Is anyone using the blockchain (or other core Bitcome technology) for device registration? I've been reading about several alternate uses for the underlying technology behind Bitcoin:


Proof of Existence (digital notary)
Namecoin (for DNS as well as identity and messaging)


I was wondering if there is any project or team working on a system for registering devices that are marketed broadly (like cellphones) with decentralized set of identity servers. Once it is registered with one server it cannot be registered with any other server, and if it is identified someone else they can look up which server and which identity manages the device. Also, if the valid user transfers the identity of the device to a new server, then everyone can be certain of the new host.
As mentioned in the comments, I can certainly see the benefit of using the immutable recording function of the blockchain to identify and record parameters, in this case MAC (media access control) addresses, which are unique to each device.

Here a few challenges which will need to be overcome:


having a device's MAC details would be fantastic for tracking ownership, for example, in the case of stolen goods. However, anyone with even IT basic knowledge knows it's trivial to change a MAC address; so whilst the blockchain is immutable the data (ie MAC) addresses is not
privacy concerns also arise. Without going in to too much detail, it's problematic to say the least to be sharing one's identifying information on a public ledger if one had less malicious intentions (eg identification of MAC address for a stolen iPad, which could then be used to match up with social phishing (social engineering) with Apple Tech Support to match an owner's name with the stolen device)
The MAC address (or similar identifying number) should be encrypted, ideally. Homomorphic encryption allows for manipulation of data without decrypting it, and will be of great use for secure cloud based access. That being said, we're still a long way off meaningful use cases of homomorphic encryption in conjunction with blockchain ledgers