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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Layer 2 scaling is a way to handle blockchain activity away from a base chain so it can support more activity. The systems connect back to the base chain for security, verification, or settlement. In Ethereum.org’s narrower definition, an L2 must derive its security from Ethereum Mainnet; a separate chain does not qualify just because it connects to Ethereum.
What does Layer 2 scaling mean?
Layer 1 (L1) is the base blockchain; here, that means Ethereum Mainnet. A Layer 2 (L2) handles some transaction execution or interaction away from Mainnet, reducing how much work users need to do directly on the base chain. The aim is to help address congestion, slow experiences, and high gas costs during periods of heavy demand. Ethereum.org describes L2s as taking advantage of Mainnet’s decentralized security model while processing transactions off Mainnet. Ethereum.org’s Layer 2 overview
The term is sometimes used more broadly in casual discussion to mean any system that helps scale a blockchain. For clarity, this article uses the Ethereum.org definition when distinguishing Ethereum L2s from other scaling approaches: an Ethereum L2 derives its security from Mainnet. That security relationship—not simply a bridge or connection—is the key distinction.
How does an L2 connect to its base chain?
Different designs move work offchain and reconnect to L1 in different ways. With rollups, transactions execute offchain and data is posted to Layer 1, where consensus is reached. What gets posted and how results are checked affect the system’s security assumptions. Ethereum.org’s scaling overview
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Optimistic rollups
Optimistic rollups treat transactions as valid by default and allow a challenge process to dispute invalid results. The name describes this verification approach; it does not mean every optimistic rollup has the same fees, speed, security properties, or withdrawal timing. Ethereum.org’s Optimistic Rollups guide
Zero-knowledge rollups
Zero-knowledge rollups submit validity proofs to demonstrate that transactions follow the rules. In this context, “zero-knowledge” describes the proof approach; it is not, by itself, a claim that transaction data is private. Ethereum.org’s zero-knowledge rollups guide
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State channels
State channels let participants make updates offchain and settle with Mainnet. Opening and closing a channel involve onchain activity, while multiple interactions can take place between those steps. Channels are a distinct approach from rollups, not another name for them. Ethereum.org’s State Channels guide
Is a sidechain an Ethereum Layer 2?
Not under Ethereum.org’s security-based definition. A sidechain is an independent blockchain that can run alongside Mainnet and connect to it through a bridge, but it uses its own consensus and security rules. A bridge can move assets or messages between networks; that connection alone does not make the sidechain inherit Ethereum’s security. Ethereum.org’s scaling overview
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Ethereum’s scaling overview also describes validium and plasma architectures. Validium uses validity proofs while keeping data away from L1; plasma is a separate chain anchored to Ethereum and uses fraud proofs. These examples illustrate why it matters to ask where data is stored and how results can be checked rather than assuming every scaling design has the same security model. Ethereum.org’s scaling overview
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should you compare when evaluating scaling systems?
“L2” describes a family of designs, not one network or a guarantee of particular costs or performance. When comparing named systems, check their current documentation for these differences:
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- Security source: Does the system derive security from Ethereum Mainnet, or rely on separate consensus and operators?
- Execution: Which activity happens offchain, and how are its results summarized or verified on L1?
- Data availability: Is transaction data posted to L1 or stored elsewhere? This affects the system’s security assumptions.
- Verification and disputes: Does the system use challenges or fraud proofs, validity proofs, or channel settlement?
- Practical use: For a specific network, verify current fees, withdrawal timing, bridge design, and operator controls in that project’s documentation. These characteristics are not universal across L2s.
There is no single transaction speed, fee reduction, or withdrawal time that applies to every Layer 2. Those outcomes depend on the particular system and its current design and operating conditions.
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