Bitcoin vs Ethereum: the real differences, explained simply

Bitcoin and Ethereum are the two largest cryptocurrencies, and they’re often mentioned in the same breath. But they were built for different purposes and work in different ways. Understanding those differences helps you make sense of the news, the fees you pay and the risks you take.

This guide compares them side by side, using each project’s own documentation. For the basics of each, see what is bitcoin? and what is Ethereum?

At a glance

Purpose: money vs platform

Bitcoin was described in a 2008 white paper by the pseudonymous Satoshi Nakamoto as “a purely peer-to-peer version of electronic cash”: a way to send payments online without going through a financial institution. Its design is deliberately limited. It does one job: recording who owns which bitcoins, and moving them.

Ethereum is broader. ethereum.org describes it as a network of computers that can run code, with its own currency, ether (ETH), used to pay for that computation. Developers write smart contracts, programs stored on the blockchain that run exactly as written, and use them to build tokens and decentralized applications. Many other tokens, including stablecoins and NFTs, live on Ethereum.

A simple way to think about it: bitcoin is closer to digital gold or cash; Ethereum is closer to a global computer that charges a fee for each operation.

Security: mining vs staking

Both networks need a way to agree on which transactions are valid without a central authority. They use different methods:

• Bitcoin uses proof of work. Miners compete to add the next block by doing large amounts of computation, which uses a lot of electricity. The winner earns newly created bitcoins plus transaction fees. Blocks arrive about every 10 minutes on average, according to Bitcoin.org.
• Ethereum uses proof of stake. Ethereum also started with mining, but on 15 September 2022, in an upgrade called The Merge, it switched to proof of stake. Validators lock up ETH as a stake (32 ETH for a validator) and are chosen to propose and confirm blocks. Time is divided into 12-second slots. ethereum.org says The Merge cut Ethereum’s energy use by about 99.95%.

The trade-off is debated. Supporters of proof of work value its long track record and the cost it imposes on attackers. Supporters of proof of stake point to energy efficiency and the ability to penalize misbehaving validators by slashing their stake.

Supply: fixed cap vs flexible

• Bitcoin: Bitcoin.org states that only 21 million bitcoins will ever be created. New coins are released on a schedule that halves roughly every four years. See the bitcoin halving explained.
• Ethereum: there’s no fixed maximum in the code. New ETH is issued to validators as rewards, while the base fee of every transaction is burned, removing that ETH from circulation. Whether the total grows or shrinks over a period depends on how busy the network is.

Fees and speed

On both networks you pay a fee to have your transaction included, and fees rise when many people want to transact at once.

On Ethereum, fees are measured in gas: the amount of computation your transaction needs. A simple ETH transfer uses less gas than, say, a trade on a decentralized exchange. ethereum.org notes that gas is paid even if a transaction fails. See exchange fees explained.

Blocks on Ethereum come much more often than on bitcoin, so transactions are usually included faster. How long you wait in practice also depends on the fee you pay and how congested the network is.

Finality: when is a payment really done?

The two networks also differ in when a transaction can be treated as settled:

See proof of work vs proof of stake and what is a 51% attack?

How each one changes

Their approaches to upgrades differ too:

• Bitcoin changes rarely and cautiously. Its biggest recent upgrades were soft forks: SegWit, activated in August 2017, and Taproot, activated at block 709,632 in November 2021. See what is bitcoin?
• Ethereum ships named network upgrades roughly every year, agreed in advance by its community: The Merge (September 2022), Shapella (April 2023), Dencun (March 2024), Pectra (May 2025) and Fusaka (December 2025), with more planned. See Ethereum’s upgrades explained.

Scaling: Lightning vs rollups

Both rely on layer 2 systems for cheap, fast everyday use:

• Bitcoin has the Lightning Network, a payment layer built on payment channels, which Bitcoin.org says offers near-instant payments typically costing less than a cent. See the Lightning Network explained.
• Ethereum has rollups, separate networks that batch transactions and post their data back to Ethereum, made cheaper by the Dencun and Fusaka upgrades. See what is a layer 2?

How they’re regulated and taxed

For most practical purposes, regulators and tax authorities treat them in similar ways:

• Tax: the IRS treats both as digital assets (property); HMRC and the CRA apply the same crypto rules to both. Buying isn’t taxed, but selling, spending or swapping can create a capital gain or loss. Swapping bitcoin for ether, or the other way round, counts as a disposal.
• Securities law (US): in its March 2026 interpretation, the SEC listed both bitcoin (BTC) and ether (ETH) among its examples of digital commodities, which it said are not themselves securities. See is crypto a security?
• Investment funds: in the US, the SEC approved spot bitcoin exchange-traded products on 10 January 2024, and on 23 May 2024 approved exchange rules to list spot ether products, which began trading in July 2024. See bitcoin ETFs explained.

Risks

Both share the big ones:

• Volatility: prices can move sharply in either direction.
• Custody: if you hold them yourself, losing your seed phrase means losing your coins. See seed phrase security.
• Scams: fraudsters use both. See crypto scams and where to report them.

Ethereum adds risks that come with its flexibility: smart contracts can have bugs or be exploited, and approving the wrong contract can let it move your tokens. If you use Ethereum apps, read what you sign. See fake crypto apps and phishing.

Which one should you choose?

That depends on what you want, and it’s a decision only you can make. We don’t give investment advice. A few questions help:

1. Do you want to hold something, or use applications? Bitcoin is simpler; Ethereum is needed for many crypto apps.
2. How would you feel if it fell by half? Only put in money you could afford to lose.
3. How will you hold it? On a registered exchange, in a fund, or in your own wallet. See how to choose a crypto exchange.

Whatever you decide, the crypto glossary explains the terms you’ll meet along the way.