Blockchain is the underlying code that provides cryptocurrency with its functionality.
Now let me give you an idea of how that code works.

Let’s say I’m part of the blockchain and that I represent a computer (known as a node) that is part of the blockchain.
Here I have some transactions.
Now if my account balance is $200, how would I tell which transactions are valid? Continued on: https://www.hamishwebb.com/what-is-bl...