Bitcoin vs Ethereum: key differences explained

Bitcoin and ethereum dominate crypto market value, but they were built for different jobs. Bitcoin (BTC) aims to be scarce, censorship-resistant money. Ethereum (ETH) is a general-purpose computer that runs smart contracts — apps that settle onchain without a traditional middleman.

This guide compares purpose, supply, how you earn yield, fees and typical use cases. It is educational, not investment advice. For buying steps see how to buy bitcoin; for custody see how to store crypto safely.

Quick verdict

What bitcoin is for

Bitcoin launched in 2009 as peer-to-peer electronic cash. In practice most people treat BTC as digital gold: a scarce asset with a predictable issuance schedule that halves roughly every four years (the “halving”). The network prioritises security and simplicity over rich application logic.

You can send BTC to anyone with an address, hold it in self-custody, or get price exposure through a spot bitcoin ETF. There is no native staking: miners secure the chain with energy and hardware, and holders do not earn a protocol yield just by owning BTC.

What ethereum is for

Ethereum launched in 2015 so developers could deploy smart contracts — code that holds assets and runs when conditions are met. That design powers DeFi lending, decentralised exchanges, NFTs, stablecoin transfers and thousands of other apps. See what is ethereum and what is DeFi.

Since The Merge in September 2022, ethereum uses proof of stake. Validators lock ETH to propose and attest to blocks; stakers can earn rewards (and take slashing risk) through solo staking, pools or liquid-staking tokens. ETH itself is the gas token: every transaction burns a base fee and tips validators.

Supply and monetary design

• Bitcoin: supply approaches 21 million BTC. New coins come only from the block subsidy, which halves on a fixed schedule. Monetary policy is extremely hard to change.
• Ethereum: there is no hard 21-million-style cap. Issuance to validators can change via governance, and the base fee burn (EIP-1559) can make supply inflate or deflate depending on usage. ETH is often described as “ultrasound money” when burn exceeds issuance — that is a market narrative, not a guarantee.

Fees, speed and layers

Both chains can get congested. Bitcoin fees spike when many people compete for limited block space. Ethereum base-layer gas can also surge; users often move activity to layer-2 networks (rollups) that settle back to ethereum with lower fees. Bitcoin has a layer-2 of its own for small, fast payments: the Lightning Network.

If you only need to move value occasionally, either chain can work. If you want frequent app interactions, ethereum (or an L2) is usually the practical choice.

Pros and cons

Which should you choose?

Ask what you need the asset to do:

• Want scarce money you can self-custody for the long term? Start with bitcoin.
• Want to use apps, issue tokens, lend, or build? You need ethereum (or another smart-contract chain).
• Many investors hold both — BTC for monetary exposure, ETH for access to the application economy — in sizes that match their risk tolerance.