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Bitcoin and Ethereum are different kinds of crypto networks. Bitcoin is designed chiefly for peer-to-peer value transfer and has a proof-of-work system and a predetermined 21 million BTC maximum supply. Ethereum is a programmable smart-contract network secured by proof of stake; its native asset, ETH, pays fees and can be staked, while issuance and burning mean it has no fixed supply cap. Neither design removes price volatility or the risks of managing crypto.
Bitcoin vs. Ethereum at a glance
| Feature | Bitcoin | Ethereum |
|---|---|---|
| Primary purpose | Peer-to-peer digital currency and value transfer | Programmable network for smart contracts and decentralized applications |
| Consensus | Proof of work: miners use computational work to add blocks | Proof of stake: validators stake ETH to help secure the network |
| Native asset’s role | BTC is the network’s currency | ETH pays network fees, supports contract execution, and is staked to secure the network |
| Supply design | Predetermined issuance schedule, with an eventual maximum of 21 million BTC | No fixed cap in the Ethereum.org comparison; issuance and burning both affect net supply |
| Key user considerations | Key custody, transaction handling, and price risk | Key custody, staking and contract complexity, and price risk |
These are protocol design differences, not a ranking. Which matters more depends on whether a user prioritizes a monetary network or programmable applications, and on the risks they are prepared to manage.
What are Bitcoin and Ethereum designed to do?
Bitcoin: peer-to-peer value transfer
Bitcoin’s central function is to let users transfer BTC across a shared network without relying on a single operator to maintain its transaction record. Its design centers on the currency and the rules for validating transactions and issuing new bitcoin.
Ethereum: a network for programmable applications
Ethereum lets developers deploy smart contracts—software that runs according to rules on the network. Applications can use those contracts for activities such as transferring assets or coordinating other on-chain functions. ETH is the network’s native asset: users pay fees in ETH, and validators stake it as part of proof of stake. For the official comparison of the networks’ purposes and assets, see Ethereum.org’s Bitcoin and Ethereum comparison.
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How do proof of work and proof of stake differ?
Bitcoin miners expend computational work
Bitcoin uses proof of work. Miners compete using computing power to propose blocks, and the process requires energy. The mining reward includes newly issued bitcoin under a schedule that declines over time. The SEC’s 2025 description says the April 2024 halving reduced the subsidy to 3.125 BTC per new block; this is the block subsidy, not a fixed payment guaranteed to a particular miner. See the SEC Crypto Task Force Digital Economy memo.
Ethereum validators stake ETH
Ethereum uses proof of stake: validators stake ETH to participate in proposing and checking blocks, and can be penalized for misconduct. Ethereum.org states in its proof-of-stake FAQ, “Ethereum uses a proof-of-stake mechanism to secure the blockchain.” The mechanism differs from mining; it changes the resources and incentives involved, but it does not make the network invulnerable. Ethereum.org notes that proof of stake is newer in live use than Bitcoin’s proof-of-work design. Learn more about Ethereum proof of stake and the proof-of-work comparison.
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How do their supplies differ?
Bitcoin has a predetermined maximum
Bitcoin’s protocol sets an eventual maximum of 21 million BTC, with new issuance following a predetermined schedule that reduces over time. The cap describes the supply rules; it does not guarantee that BTC will rise in price or retain purchasing power.
Ethereum has issuance and burning, not a fixed cap
Ethereum does not have a fixed supply cap in the cited comparison. ETH is issued in connection with staking, while some ETH is burned in connection with network activity. As a result, net supply can rise or fall. Neither the presence of a cap nor variable net issuance alone determines an asset’s price or value. These supply descriptions are set out in Ethereum.org’s comparison.
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Proof of work requires mining computation and energy. Ethereum.org reports that Ethereum’s move from proof of work to proof of stake reduced its energy expenditure by approximately 99.98% relative to its earlier system. That figure is Ethereum.org’s estimate about Ethereum’s transition, not a current live measurement or a direct, controlled comparison with Bitcoin. The two networks use different consensus mechanisms, so the estimate should not be read as a measurement of the energy used by both networks on equal terms. See Ethereum.org’s energy-consumption explanation.
What risks should users consider?
Market risk applies to both assets
Bitcoin and ether prices can be highly volatile. A supply rule, staking reward, or network use does not protect an asset’s market price from falling. The SEC’s investor bulletin discusses the volatility of bitcoin and ether prices; it does not establish a current investment outlook. Read Investor.gov’s crypto asset custody bulletin.
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Direct custody makes key security your responsibility
When you hold crypto directly, access depends on private keys or recovery material. Losing them, exposing them, or making a transaction mistake can mean losing access or funds. A hardware wallet is one optional way to manage keys; it does not prevent price losses, eliminate user error, or make transactions risk-free. Bitcoin.org’s Bitcoin FAQ also explains that users are responsible for safeguarding their wallets.
Third-party products change the risks, not erase them
An exchange or custodian introduces dependence on that provider and its handling of assets. An exchange-traded product has a different structure and risk profile from directly holding BTC or ETH; it is not the same as controlling the underlying asset’s private keys. Consider what you own, who holds the assets, and what happens if access or a provider fails.
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Which network is the better fit?
- Bitcoin may be more relevant if your main interest is a peer-to-peer digital currency with a predetermined issuance schedule.
- Ethereum may be more relevant if you want to interact with smart-contract applications or understand a network where ETH supports both fees and proof-of-stake validation.
- Neither is a low-risk substitute for cash. Both involve volatile assets, and direct use adds custody and transaction responsibilities.
These are distinctions in design and use, not personalized investment advice. The right comparison is between the actual activity you intend to do and the risks—including custody and price risk—you can accept.
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