What Is Blockchain?A blockchain is a special kind of database, also called a decentralized digital ledger, that's maintained by numerous computers distributed around the world. Blockchain data is organized into blocks, which are chronologically arranged and secured by cryptography. The earliest model of a blockchain was created in the early 1990s when computer scientist Stuart Haber and physicist W. Scott Stornetta employed cryptographic techniques in a chain of blocks as a way to secure...