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Bitcoin is primarily a peer-to-peer digital currency with a protocol supply limit of 21 million BTC. Ethereum is a programmable blockchain for smart contracts and decentralized applications; its native asset, ether (ETH), pays for network activity and helps secure the network. The key difference is what each network is designed to do—and how it reaches agreement on transactions.
Bitcoin and Ethereum at a glance
| Dimension | Bitcoin | Ethereum |
|---|---|---|
| Primary role | Peer-to-peer digital currency | Smart-contract and decentralized-application platform that also transfers value |
| Native asset | Bitcoin (BTC) | Ether (ETH), used for transaction fees and proof-of-stake security |
| Consensus | Proof of work: miners use computational resources to propose blocks | Proof of stake: validators stake ETH and may lose some stake for specified misconduct |
| Supply design | Protocol supply limit of 21 million BTC | No fixed maximum; issuance and transaction burns affect supply |
| Finality | Confidence grows as more blocks are added | Proof-of-stake finality; Ethereum’s comparison guide describes timing as typically around 15 minutes |
| Energy model | Mining consumes energy to perform proof of work | Proof of stake uses substantially less energy than Ethereum’s former proof-of-work system |
These are network-level distinctions, not a verdict on which asset is a better investment. This comparison does not assess current prices, returns, fees, adoption, regulation, taxes, exchange availability, or the energy mix in a particular country.
What are the networks designed to do?
Bitcoin: peer-to-peer digital money
Bitcoin’s central purpose is enabling people to transfer value directly across a decentralized network. Its design prioritizes the currency and the process for agreeing on valid transactions. Bitcoin has scripting capabilities, but general-purpose smart contracts and applications are not its defining platform role.
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Ethereum also transfers value, but its defining feature is that developers can deploy smart contracts: programs that run on the blockchain when their conditions are met. Those programs support decentralized applications, while ETH is used to pay for transaction and application execution and to participate in proof-of-stake security. Ethereum.org’s comparison describes these differing roles.
How do Bitcoin and Ethereum secure transactions?
Bitcoin uses proof of work
Bitcoin miners expend computational resources to propose blocks. The energy expenditure is part of the proof-of-work mechanism: miners compete to perform the work, and the network uses that process to agree on the chain of transactions. Bitcoin.org’s explanation of how Bitcoin works outlines the network’s transaction and block process.
Ethereum uses proof of stake
Ethereum validators stake ETH to participate in proposing and validating blocks. The protocol can penalize validators by taking some staked ETH for specified misconduct. Ethereum’s move away from proof of work is specified in EIP-3675, created on July 22, 2021. Ethereum’s documentation also notes that proof of stake has a shorter operating history than proof of work and that its implementation is complex; lower energy use alone does not establish that one system is categorically safer. See Ethereum’s proof-of-stake documentation.
How do BTC and ETH supply differ?
Bitcoin has a protocol supply limit
Bitcoin’s protocol sets a maximum supply of 21 million BTC. That is a supply-design rule; it does not determine the market price or guarantee any particular value for BTC.
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Ethereum has variable supply
Ethereum has no fixed maximum supply. The protocol issues ETH as validator rewards, while transaction activity burns ETH. As a result, total ETH supply can rise or fall depending on issuance and burns; it is not accurate to describe ETH as having a fixed cap. Ethereum.org presents the supply distinction in its Bitcoin comparison.
What do finality and confirmation mean for a transaction?
Bitcoin transaction confidence is probabilistic: additional blocks after the block containing a transaction make reversal less likely, but the network does not provide a fixed finality guarantee. Ethereum uses proof-of-stake finality. Its documentation describes 12-second slots and 32-slot epochs, while its comparison guide characterizes finality as typically around 15 minutes. These are protocol descriptions, not promises that a wallet, exchange, or merchant will treat an individual transaction as settled within a particular time. Their policies and requirements may differ. See Ethereum’s proof-of-stake documentation and its Bitcoin comparison.
How different are their energy requirements?
Bitcoin proof-of-work mining consumes energy to perform the computation used in block production. Ethereum’s proof-of-stake system does not require miners to perform that same energy-intensive work. Ethereum.org estimates that Ethereum’s transition from proof of work reduced its energy expenditure by approximately 99.98%; that is the organization’s estimate, not an independent measurement reproduced here. The figure compares Ethereum before and after its transition, not Bitcoin and Ethereum under identical conditions. See Ethereum.org’s proof-of-stake versus proof-of-work explanation and its proof-of-stake FAQ, updated April 13, 2026.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which is better: Bitcoin or Ethereum?
Neither is universally better; the relevant choice depends on the purpose. Bitcoin’s design centers on peer-to-peer digital currency and a capped supply. Ethereum is designed for programmable applications as well as value transfers, and its asset supports fees and proof-of-stake security. These technical differences do not establish which asset is a better investment, nor do they predict future performance.
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