Blockchain in IoT and Beyond: Case Studies …

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Fig. 7 The nodes

The subsequent kind is a Pseudonym—a Blinded Identifier used to keep up

security with regard to a progressing advanced connection. In the event that the

Pseudonym is utilized to keep up just a single relationship, we will consider it a

Pairwise-Unique Identifier.

Note the relation of Pairwise Unique Identifiers is explained in Fig. 7, the wallet

section where Drone D1 has Pairwise DID with Drones D2, D3, D4 but Drone D2 on

the other hand shares a DID with Drones D1 and D3 only. In the same diagram, it is

apparent that Drone D4 has made communication with Drones D1 and D3 during its

lifetime in the Network D and so is unaware of Drone D2.

Wallet

The wallet is the secure capacity for cryptographic tools like DIDs, keys, and so

on. It is an advanced compartment for information that is expected to control a

self-sovereign identity. A common misconception is that Identity Wallet is the same

as cryptocurrency wallets. However, an identity wallet can hold something beyond

cryptographic money keys. Wallets may have to oversee many relationships.

In Fig. 7, we show the concept of wallets where the pairwise unique identifiers

or DIDs are stored in records. Every wallet is private to its drone and only stores

the record of any other drone, which may have initiated any form of communication

with it. In doing so, the communicating drone must have had to identify itself by

establishing a common truth and proving its identity through the shared identity

ledger. This would mean it generated a pairwise unique identifier with the drone it

was communicating with.