Using bitcoin addresses as serial numbers? (cryptoproof.info)

Cryptographic Proof Of Association is a method of identification by which users who submit their bitcoin extended master public keys which comply to the BIP32 standard can have their identity inferred by checking if a subsequent address is a product (subkey) of that public key.

A very simple website with very big implications.

Our service is completely unique and was thought up not only promote the use of bitcoin as a tool for liberation but to also help protect consumers in the new world of 3D printed products which is just on the horizon.

Built from the ground up to be a trustless system, no user names, no passwords, no risk of theft from subkey addresses and no public keys written to disk which means no risk of subkey address exposure even if the site were to become compromised.

Accounts are verified on the back of https certificate authority providers and so no formal identification is required of any kind either.

Any input, feedback or suggestions from other developers would be greatly appreciated :)