The first concept you need to understnad about the blockchain is the following. There isn’t one. There are many. Blockchains are distributed, tamper proof public ledgers of transactions.
If you still need some clarification on how it actually works. Don Tapscott is here to help, demystifying this world-changing, trust-building technology which, he says, represents nothing less than the second generation of the internet and holds the potential to transform money, business, government and society.