Ethereum is not a copy of Bitcoin. Bitcoin is a ledger of units. Ethereum is a machine: a network of computers that runs programs, called contracts, and keeps a shared state. The unit that pays for that work is ether, ticker ETH. Three words, three objects. Mixing them is already a mistake.

In 2013 Vitalik Buterin describes the idea. The network opens on 30 July 2015. On 15 September 2022 the Merge stops specialised mining and moves to proof of stake. Since then it is not specialised machines that write blocks. It is validators who have put ether at stake.

Ethereum is a decentralized platform that runs smart contracts: applications that run exactly as programmed without any possibility of downtime, censorship, fraud or third-party interference.— ethereum.org, founding docs

What it is

A contract here is not a PDF. It is code deployed on the chain. It can hold a balance, a title, a loan, a set of rules. Once published it runs the same way for everyone, as long as you pay gas — the cost of compute, in ether. Nobody needs a company in the middle for the instruction to go through. You need a node, a signed transaction, and enough gas.

Around that machine, uses were built: DeFi (loans, exchanges without a counter), stablecoins, tokens, later tokenised securities. That is not “Ethereum = those apps”. Ethereum is the ground. Apps can die. The ground remains, if validators and nodes remain.

The software is discussed through proposals — EIPs. The Ethereum Foundation coordinates, funds, talks. It does not decree alone. Vitalik weighs; he does not press a switch.

What it is not

It is not Bitcoin. No 21-million cap. Not ten minutes per block. Not the same job. It is not anonymous: addresses are public. It is not free. It is not a listed company. Consensys, MetaMask, L2s, funds — neighbours, not the protocol.

It is not magically deflationary. Since August 2021 a share of fees is burned (EIP-1559). When layer-1 activity is strong, supply can recede. When it is weak — and a large share of traffic lives on layer 2s — ether can still be created faster than it is destroyed. “Ultrasound money” has been overused. Flows have no ear.

How a transaction leaves

You sign with a key. You send to an address, or you call a contract. Validators include the transaction in a block. Gas is paid in ether, often in gwei (a billionth of an ETH). Too little, it does not enter. Wrong recipient, nobody refunds.

A large share of real activity now happens above: Arbitrum, Base, Optimism and others. They batch, they post a summary on Ethereum. Cheaper. Faster. With other assumptions — a sequencer, a bridge. That is not “more Ethereum”. It is Ethereum plus a floor.

Who validates

To run a validator yourself, the floor remains 32 ETH. Since Pectra, in May 2025, a single validator can go up to 2,048 ETH and compound rewards. You can also delegate, via a pool or liquid staking. Less hardware. More trust in a third party.

In mid-September 2026 about a third of supply is at stake — on the order of 41 million ETH, per chain tables. Yield has fallen as more people stake. A misconfigured or malicious validator can be slashed: part of the stake goes. This is not a savings book.

Ether has no cap

Supply circulates around 122 million ETH. There is no maximum in the code, unlike bitcoin. Issuance to validators continues. The base-fee burn offsets it, sometimes. Since the Merge the stock has not melted as a story had promised. It grew a little. Saying “there will be no more” is false.

In 2016 The DAO is drained. The network splits: Ethereum one side, Ethereum Classic the other. The lesson still holds. A contract can be stupid. A community can choose to rewrite history. That is not a detail.

What moves the price

Ether pays gas, is staked, is used as collateral. That creates demand. It does not set a price. In mid-September 2026 ETH trades around $2,500. A year earlier it was much higher. That is not advice. It is a calendar.

U.S. spot ETFs move billions in and out. Staking pulls float. L2s cut fees on Ethereum, so sometimes the burn. Four forces, rarely aligned. A “cycle” is not a contract.

How to hold some

With an intermediary: a platform holds the ether. Simple. Their custody, their withdrawals, their survival. In Europe MiCA covers some of these actors. That prevents neither an outage nor a seizure. At home: a wallet whose keys you hold. MetaMask in the browser. A dedicated device for what you do not want glued to a site. The recovery phrase is written offline. It is not photographed.

Scams do not need to break Ethereum. They need a signature, a fake site, “support” asking for the phrase. A clever contract can empty a wallet in one approval. Reading before signing is not a slogan. It is the only barrier.

Where the network stands in 2026

Fusaka, on 3 December 2025, mainly served L2 data (PeerDAS) and raised the gas limit. Glamsterdam is still a worksite for the second half of 2026, not a fact. The Foundation aims at quantum resistance around 2029, via Hegotá. A cheaper attack is not a break date. It is a file.

What the network holds: a shared machine, contracts that run, ether to pay and stake, the absence of a seat that cuts the power. What it does not hold: a price, anonymity, the absence of bugs, the absence of sequencers on the floors, a supply that can only fall.

Ethereum is a public computer. You can ignore it. You can sign too fast. You can confuse it with a share. The machine executes what is paid.