What is Ethereum, what is ether?

The value of ether rose 8,978% in 2017.

That was the biggest rise of any cryptocurrency in 2017 except for ripple. And much of ether’s overall rise came at the very end of the year (65% in December alone), suggesting that ether and Ethereum, the network it runs on, are super-hot right now.

You might ask: why? What is ether? What is Ethereum? And how is it different from bitcoin?

Here are your answers.

What is Ethereum?

For starters, remember that bitcoin, invented in 2009, runs on “blockchain,” a decentralized, immutable, peer-to-peer ledger that records every transaction done in bitcoins. Bitcoin miners use expensive machines to verify and upload (or “mine”) bundles of transactions (called “blocks”) to the chain.

Ethereum also runs on a blockchain, also maintained by miners. But unlike the bitcoin blockchain, Ethereum is designed specifically to carry out “smart contracts,” which are automated agreements for an exchange of value. (This is also called “scripting.”) Smart contracts are a way to cut the middleman out of financial transactions; a network of nodes carry out agreements by independently verifying them. The Ethereum blockchain not only records every ether transaction, but also the most up-to-date form of every smart contract.

Ether (ETH) is the token of the Ethereum chain. So ether is to Ethereum what bitcoin is to the bitcoin blockchain. (Be warned: most people simply refer to ether, the token, as “ethereum.”)

Vitalik Buterin published the Ethereum white paper in 2013, but the network did not go live until July 2015 when the “genesis block” of ether was mined on the Ethereum blockchain. Leading up to that, Ethereum held a token sale, nowadays popularly called an initial coin offering (ICO), in which it sold 60 million ether tokens and brought in more than $18 million worth of bitcoin. (Buyers bought ether and paid in bitcoin.) In 2017, ICOs exploded in popularity, and most of them are carried out over Ethereum.

Now, at the outset of 2018, the buzziest use case has been a digital cat-birthing game called CryptoKitties, in which users pay in ether to breed, trade, and collect digital cats. That might make you laugh, but the game’s dual purpose has been to illustrate the uses of Ethereum. It took off: more than 200,000 people are now playing CryptoKitties.

As a result, the game’s popularity ended up also exhibiting the limitations of the Ethereum network. It got so popular that it bogged down the system, and the cost per cat, or “gas” per transaction, had to be raised. “Gas” on the Ethereum chain is paid for in ether. To make a transaction settle faster, you can pay for more gas.