What is blockchain technology? A blockchain originally block chain is a continuously growing list of records, called blocks , which are linked and secured using cryptography. Each block typically contains a hash pointer as a link to a previous block, a timestamp and transaction data. By design, blockchains are inherently resistant to modification of the data. A blockchain can serve as "an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way". The first work on a cryptographically secured chain of blocks was described in 1991 by Stuart Haber and W. Scott Stornetta. It can also be defined as " A database or a ledger that maintains a continuously growing list of data records or transactions" . "So, it's a spreadsheet, like Excel?" Many of us may be thinking of that. In a way yes , but it has qualities that make it better than ...