Picture a chain you might use for a ship’s anchor. But in this case, every link on the chain is a chunk of information that contains transaction data. At the top of the chain, you see what happened today, and as you move down the chain you see older and older transactions. And if you follow it all the way down to the anchor sitting at the bottom of the harbor? You’ll have seen every single transaction in the history of that cryptocurrency. Which gives the blockchain powerful security advantages: it’s an open, transparent record of a cryptocurrency’s entire history. If anyone tries to manipulate a transaction it will cause the link to break, and the entire network will see what happened. That, in a nutshell, is blockchain explained.
Another way people often describe the blockchain is that it’s a ledger (sometimes you’ll hear the terms ‘distributed ledger’ or ‘immutable ledger’), which is similar to the balance sheet of a bank. Like a bank’s ledger, the blockchain tracks all the money flowing into, out of, and through the network.
But unlike a bank’s books, a crypto blockchain isn’t maintained by any individual or organization, including banks and governments. In fact, it isn’t centralized at all. Instead, it is secured by a large peer-to-peer network of computers running open-source software. The network is constantly checking and securing the accuracy of the blockchain.
Where does new cryptocurrency come from? Every so often – around every ten minutes in the case of Bitcoin – a new chunk of transaction information (or a new block) is added to the chain of existing information. In exchange for contributing their computing power to maintaining the blockchain, the network rewards participants with a small amount of digital currency.
A crypto blockchain is distributed across the digital currency’s entire network. No company, country, or third party is in control of it; and anyone can participate.
Key questions:
How do you send and receive money over a blockchain?
The cryptocurrency network assigns each user a unique ‘address,’ which is made up of a private key and a public key. Anyone can send you money via your public key, which is akin to an email address. When you want to spend your money, you use your private key, which is basically your password, to digitally ‘sign’ transactions. The easiest way to manage your cryptocurrency is via software called a wallet, which you can get via an exchange like Coinbase.
Who invented the blockchain?
What's the future of blockchains?
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