This book is designed to provide an introduction to the world of blockchain technology. It covers the basics of blockchain, including its history, how it works, and its potential applications. It also provides a comprehensive overview of the different types of blockchain, such as public, private, and
A blockchain is a distributed ledger with growing lists of records (blocks) that are securely linked together via cryptographic hashes. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data. Since each block contains information about the previous block, they effectively form a chain, with each additional block linking to the ones before it. Consequently, blockchain transactions are resistant to alteration because, once recorded, the data in any given block cannot be changed retroactively without altering all subsequent blocks and obtaining network consensus to accept these changes.