Chapter 3 Design Figure 3-25. Blockchain architecture Blockchain Case Study There are many use cases that can be solved using blockchain or distributed ledger technology, which can ensure immutability and transparency of records in the ledger and provide a common platform for users across industries and organizations. Use cases such as KYC, EHR, digital identity, POE (proof of existence), claim management, etc. are explained in brief in following section. • Know your customer (KYC): The blockchain-based KYC process using digital identity helps banks to know their customers. A digital signature is created and stored in a blockchain-based system; data is linked with the customer’s digital signature, which is decrypted with the customer’s private key. • Electronic healthcare records (EHR): Blockchain is used to provide patients an ecosystem to control and store their health records in a blockchain network. Patients could give or revoke permission to share their medical record with a medical institution and doctors, although every medical institution would be appending medical records and tests in the user’s blockchain in a distributed ledger. 100