Ethereum(ETH)

Quick summary coming soon — read the full breakdown below.

What Is Ethereum?#

Ethereum is a programmable blockchain — a decentralized network where developers deploy smart contracts (self-executing code that runs exactly as written, with no intermediary needed). Launched in 2015 by Vitalik Buterin and a team of co-founders, Ethereum extended Bitcoin's concept of a shared ledger into a general-purpose computing platform. If Bitcoin is a calculator, Ethereum is a smartphone: it runs applications. Ethereum — Ethereum enables smart contracts and decentralized apps powe…

Those applications span decentralized finance (DeFi), NFT marketplaces, identity systems, DAOs (decentralized autonomous organizations), and supply-chain tracking — among hundreds of other use cases. Ethereum hosts over $50 billion in DeFi total value locked, more than every other blockchain combined, making it the settlement layer for most of crypto's financial infrastructure.

The Problem Ethereum Solves#

Before Ethereum, building a decentralized application meant designing a new blockchain from scratch — an enormous engineering effort. Ethereum provides a shared platform with built-in consensus, networking, and execution, so developers can focus on application logic rather than infrastructure. Smart contracts replace trusted intermediaries: an escrow service, a lending protocol, or a token sale can run on code alone, auditable by anyone.

How Ethereum Works#

Execution Layer#

Every Ethereum node runs the Ethereum Virtual Machine (EVM), a sandboxed runtime that executes smart contract bytecode. Developers typically write contracts in Solidity (a high-level language resembling JavaScript) and compile them to EVM bytecode. Once deployed, a contract lives at a specific address on the blockchain and can hold funds, enforce rules, and interact with other contracts.

Consensus: Proof of Stake#

Since The Merge on September 15, 2022, Ethereum uses a Proof-of-Stake (PoS) consensus mechanism, replacing the original Proof-of-Work mining. Validators stake a minimum of 32 ETH as collateral and are randomly selected to propose and attest to new blocks. Misbehaving validators risk slashing — losing part of their staked ETH.

This transition reduced Ethereum's energy consumption by approximately 99.95%, according to the Ethereum Foundation.

Gas and EIP-1559#

Every computation on Ethereum costs gas — a unit that meters resource usage and prevents denial-of-service attacks. Since the London upgrade (August 2021), transaction fees follow the EIP-1559 model: each block has a base fee (automatically adjusted by the protocol and burned) plus an optional priority fee (tip paid to the validator). The base-fee burn makes ETH supply slightly deflationary during periods of high network usage.

Layer 2 Scaling#

Ethereum's base layer processes roughly 15-30 transactions per second. To scale beyond that, the ecosystem relies on Layer 2 rollups — separate chains that execute transactions off-chain and post compressed proofs back to Ethereum for security. The two main approaches are optimistic rollups (used by Arbitrum and Optimism) and zero-knowledge rollups. Ethereum's roadmap centers on making rollups cheaper through danksharding (EIP-4844, shipped March 2024), which introduced blob transactions that cut L2 posting costs by roughly 10x.

Ethereum Tokenomics#

ETH is the native token of the Ethereum network. Key facts:

• Total supply: No hard cap. As of mid-2025, approximately 120.5 million ETH in circulation.
• Issuance: New ETH is minted as staking rewards to validators — currently around 3-4% annualized yield. The exact rate depends on how much total ETH is staked.
• Burn mechanism: Under EIP-1559, the base fee of every transaction is burned. During high-usage periods, more ETH is burned than issued, making the net supply deflationary.
• Net supply change: Since The Merge, ETH supply has been roughly flat to slightly deflationary — a significant shift from the ~4.5% annual inflation under Proof of Work.

ETH serves three roles: (1) payment for transaction gas fees, (2) staking collateral for validators securing the network, and (3) the primary unit of account across Ethereum's DeFi ecosystem.

Key Features#

• Smart contracts: Turing-complete programmability via the EVM, supporting any logic expressible in code
• Composability: Contracts can call other contracts, enabling "money Legos" — DeFi protocols that build on each other
• ERC standards: Token standards like ERC-20 (fungible tokens) and ERC-721 (NFTs) created interoperable ecosystems
• Proof of Stake: Energy-efficient consensus with economic finality
• Layer 2 ecosystem: The largest rollup ecosystem in crypto, including Arbitrum, Optimism, and zkSync

What Sets Ethereum Apart#

Ethereum's primary advantage is its network effect: the largest developer community, the deepest DeFi liquidity, and the most battle-tested smart contract platform. Competitors like Solana offer higher throughput at the base layer, and Polkadot focuses on cross-chain interoperability, but Ethereum's ecosystem depth and security track record remain unmatched.

The tradeoff is that Ethereum's base layer is intentionally constrained for decentralization — scaling is delegated to Layer 2s, which adds complexity for users navigating bridges and multiple networks.

Critical Assessment#

The Ethereum whitepaper, published in 2013, laid out a vision that has largely been realized: a general-purpose blockchain supporting arbitrary applications. The transition to Proof of Stake was the most significant live upgrade in blockchain history, executed without downtime on a network securing hundreds of billions in value.

Open challenges include: (1) user experience fragmentation across L2s, (2) MEV (maximal extractable value) — where validators and searchers can reorder transactions for profit at users' expense, and (3) governance, which remains informal and relies on rough consensus among core developers. The Ethereum Foundation has no formal authority over the protocol, which is both a strength (decentralization) and a risk (coordination difficulty). Compared to consensus designs that minimize coordination overhead via reputation rather than computation, see XRP's trust-based consensus approach.

Looking further ahead, Ethereum's cryptographic foundations will eventually face pressure from quantum computing advances; projects like Quantum Resistant Ledger are already building quantum-resistant primitives into their base protocol.

Ethereum FAQs#

Q: What is The Merge? A: The Merge was Ethereum's transition from Proof-of-Work mining to Proof-of-Stake validation, completed on September 15, 2022. It cut the network's energy usage by ~99.95% and changed how new blocks are produced.

Q: Does Ethereum have a maximum supply? A: No. Unlike Bitcoin's 21 million cap, Ethereum has no hard supply limit. However, the EIP-1559 burn mechanism means supply can decrease during periods of high usage, making ETH periodically deflationary.

Q: What are gas fees? A: Gas is the unit measuring computational work on Ethereum. Users pay gas fees (denominated in ETH) to compensate validators for processing transactions. Fees rise when the network is congested and fall when demand is low.

Q: What is a Layer 2? A: A Layer 2 is a separate blockchain that processes transactions off-chain but inherits Ethereum's security by posting proofs back to it. Arbitrum and Optimism are the two largest Layer 2 networks.

Q: How much ETH do I need to become a validator? A: Running your own validator node requires staking 32 ETH. Alternatively, liquid staking protocols like Lido let users stake any amount and receive a tradeable receipt token (stETH).

Takeaways#

• Ethereum is the largest smart contract platform, hosting the majority of DeFi, NFT, and DAO activity in crypto.
• Since The Merge (September 2022), Ethereum runs on Proof of Stake, cutting energy usage by ~99.95%.
• EIP-1559 burns a portion of every transaction fee, making ETH supply roughly flat to deflationary.
• Scaling is handled by Layer 2 rollups like Arbitrum and Optimism, with Ethereum serving as the security and settlement layer.