How does Ethereum work?

[caritop@]

Like Bitcoin, the Ethereum network exists on thousands of computers worldwide, thanks to users participating as “nodes,” rather than a centralized server. This makes the network decentralized and highly immune to attacks, and essentially unable to go down as a result. If one computer goes down, it doesn’t matter because thousands of others are holding the network up.

Ethereum is essentially a single, decentralized system that runs a computer called the Ethereum Virtual Machine (EVM). Each node holds a copy of that computer, meaning that any interactions must be verified so everyone can update their copy.

Network interactions are otherwise considered “transactions” and are stored within blocks on the Ethereum blockchain. Miners validate these blocks before committing them to the network and acting as transaction history or a digital ledger. Mining to verify transactions is known as a proof-of-work consensus method. Each block has a unique 64-digit code identifying it. Miners commit their computer power to find that code, proving that it's unique. Their computer power is “proof” of that work, and miners are rewarded in ETH for their efforts.

Also like Bitcoin, all Ethereum transactions are entirely public. Miners broadcast completed blocks to the rest of the network, confirming the change and adding the blocks to everyone's copy of the ledger. Confirmed blocks cannot be tampered with, serving as a perfect history of all network transactions.

[beringtom]

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