What is blockchain technology?
Blockchain is a growing list of records, called blocks, which are linked using cryptography. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data.
Blockchain was invented by a person or group of people called " Satoshi Nakamoto" in 2008. It has gained wide attention due it's designed property of resistance to modification of data. Blockchain invention led to the creation of first digital currency called 'Bitcoin' which solved the problem of double-spending and this was achieved without any centralized server.