Bitcoin and Ethereum both use blockchain technology, but they are built for different jobs. Bitcoin is a proof-of-work digital currency with a protocol-defined eventual limit of 21 million BTC. Ethereum is a proof-of-stake network for smart contracts and decentralized applications; ETH pays network fees and helps secure the network. Their different consensus and supply rules create different trade-offs, not a universal winner.
What is the difference between Bitcoin and Ethereum?
| Comparison | Bitcoin | Ethereum |
|---|---|---|
| Primary role | Peer-to-peer digital currency, often framed as a scarce store of value | Programmable network for applications and settlement |
| Consensus | Proof of work: miners use computation to add blocks | Proof of stake: validators stake ETH to participate in consensus |
| Supply design | Predetermined issuance with an eventual protocol limit of 21 million BTC | No fixed supply cap in the cited comparison; issuance and activity-linked burning affect net supply |
| Security model | Accumulated proof of work and increasing confirmation depth | Staked capital, validator incentives, finality, and penalties including slashing |
| Energy | Mining requires electricity for computation | Energy use fell by more than 99% after the 2022 transition to proof of stake, according to Ethereum.org |
| Main trade-off | A narrower base-layer role and energy-intensive mining | More programmability, with additional protocol complexity and staking-related risks |
These are differences in design, not a clean division of every possible use: both networks can transfer and store value, and scaling layers complicate simple comparisons. “Digital gold” and “global settlement layer” are common framings, not promises of future economic results.
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What are Bitcoin and Ethereum used for?
Bitcoin: focused on value transfer
Bitcoin is designed around peer-to-peer digital currency. Its relatively limited scripting supports a narrower range of base-layer functions than Ethereum’s, a design choice associated with a focus on payments and a scarce-asset narrative. Whether BTC will preserve or increase value is not guaranteed by that design.
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Ethereum: a programmable network
Ethereum supports programs that run on-chain, known as smart contracts. Applications built on them include lending, trading, games, and digital collectibles. ETH is used to pay transaction fees and interact with smart contracts, and it is also staked by validators to help secure the network.
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Why does Bitcoin have a supply cap but Ethereum does not?
Bitcoin’s predetermined issuance
Bitcoin’s protocol rules set an eventual supply limit of 21 million BTC. New BTC issuance declines over time according to those rules; the limit is not the same thing as the amount currently circulating.
Ethereum’s issuance and burning
Ethereum has no fixed maximum supply in the cited comparison. ETH is issued to validators in relation to staked ETH, while a portion of fees is burned in relation to network activity. Net supply can therefore rise or fall depending on how issuance compares with burning. “No fixed cap” does not mean supply must always increase.
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Proposals are not active policy
EIP-8363, “Tapered Issuance Burn,” is a proposal that would require a hard fork; it is not an activated Ethereum supply rule. The proposal reports that, in the year ending July 31, 2026, MEV-Boost relays paid proposers about 72,600 ETH across 2.42 million blocks, averaging 0.030 ETH per block. It also estimates consensus issuance at about 1,054,000 ETH per year at the staked base stated in the proposal. These are context-specific proposal figures, not general guarantees of staking yield or future issuance.
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Bitcoin: proof of work and confirmations
Bitcoin miners compete to add blocks using proof of work, while full nodes independently check that blocks follow consensus rules. Rewriting a transaction’s history requires overcoming accumulated work; as more blocks build on a transaction, altering it generally becomes harder. Confirmation is probabilistic rather than an instant guarantee. Six confirmations is a rule of thumb, not a universal settlement time or assurance against every threat. See Bitcoin Developer Documentation for its explanation of block validation and chain depth.
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Ethereum: proof of stake, finality, and slashing
Ethereum validators stake ETH rather than mine blocks. Dishonest behavior covered by the protocol’s penalties can result in losing stake. Ethereum.org says finality often occurs around 15 minutes; this describes the network’s consensus process, not necessarily the full time for an application, exchange, or payment provider to credit a transaction. The system’s explicit finality and slashing differ from Bitcoin’s confirmation-depth model.
Different attack surfaces, not a simple safety ranking
Proof of stake has trade-offs: Ethereum’s design is more complex than proof of work, and liquid-staking providers can concentrate a large share of stake. Proof of work also has trade-offs, including electricity demand and reliance on mining hardware and pools. These differences do not establish that either network is categorically safer. A useful risk assessment depends on which risks matter to the user and how the network and surrounding services are used.
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Which uses more energy?
Ethereum moved from proof of work to proof of stake in 2022. Ethereum.org reports that the change reduced its energy consumption by more than 99%. Bitcoin still uses proof-of-work mining, which consumes electricity for miners’ computation. These design facts indicate why Ethereum’s energy use fell sharply, but they are not a dated side-by-side annual energy measurement; a current numerical comparison would need a defined measurement boundary and date.
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Which is faster or cheaper for transactions?
There is no durable answer based on one throughput, fee, or confirmation figure. Fees can spike with congestion, and the networks’ different use cases make some performance figures difficult to compare directly. The IMF’s September 2025 Working Paper WP/25/186 cautions against treating such figures as directly comparable.
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Scaling also changes what users experience. Ethereum activity may take place on layer-2 networks, while Bitcoin users may use the Lightning Network. A comparison should specify whether it means base-layer transactions or a particular scaling network, and should account for the fees and confirmation policies of the service involved.
Which network is the better fit?
- Consider Bitcoin’s design if your main interest is a peer-to-peer digital currency with predetermined issuance and a narrower base-layer role.
- Consider Ethereum’s design if your interest is using smart-contract applications or a network where ETH serves both as a fee asset and staking asset.
- Compare the specific risk you care about—such as energy use, validator or miner concentration, transaction confirmation, or application complexity—rather than treating “safer” as a single measurable property.
- Check the relevant layer when comparing fees or speed: base-layer figures do not necessarily describe activity on Lightning or Ethereum layer 2s.
This is a protocol comparison, not an investment recommendation. It does not establish which asset will perform better or provide a current investment-risk ranking.
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