Protocol Design
There are three layers to the passcard + blockchain name system protocol (BNS):
At the bottom is the decentralized key-value store, which stores the information for each identity. Some examples are Namecoin and Blockstore (on the Bitcoin blockchain), but the protocol is ultimately key-value store and blockchain agnostic.
In the middle is the blockchain name system, which is responsible for resolving the data stored in the key-value store.
At the top is the passcard identity layer. Passcards refer to user identities and how they are represented, whether that be visually or in raw data format.
