Blockchain is not a single technology. After having been conceived by Bitcoin creator — Satoshi Nakamoto, the world discovered the first known representation of this abstract concept through Bitcoin. Since then, hundreds of implementations have been explored. These are also called Distributed Ledger Technologies.
With hindsight, the blockchain concept is quite simple: it proposes an innovative information system architecture to process value exchange within open ecosystems. On the traditional web, information can be corrupted. Blockchain aims at securing high-sensitive data exchanges to preserve them from wrongdoing.