Layer 1 Blockchains
Learn what Layer 1 blockchains are, how base-layer execution and consensus work, and the trade-offs involved in scaling a blockchain at the protocol level.
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A Layer 1 (L1) is the base blockchain itself: the network whose own validators or miners order transactions, enforce protocol rules and provide the canonical ledger.
The core idea
An L1 is the foundational settlement and consensus network. Bitcoin and Ethereum are familiar examples, but different L1s make different choices about block size, block time, validator requirements, execution design and data availability.
Transactions and smart-contract calls are processed according to the base protocol.
Miners or validators agree on the canonical state.
The L1 is the final reference point for ownership and state.
The network makes the data needed to verify state transitions available under its protocol rules.
How L1 scaling works
An L1 can increase capacity by changing the base protocol itself. Examples include improving data throughput, changing block parameters, parallelising execution, improving state management, or introducing new data-availability techniques.
| Approach | Potential benefit | Trade-off to examine |
|---|---|---|
| Larger or more frequent blocks | More transactions per unit of time | Higher bandwidth/storage demands can make nodes harder to run |
| Execution optimisation | Higher compute throughput | Complexity and hardware requirements |
| Data-availability upgrades | More room for rollup data or transactions | Protocol complexity and implementation risk |
| Parallel execution | Greater throughput for independent workloads | More complex state-conflict handling |
The scalability trilemma
Blockchain design is often framed as a balance between scalability, security and decentralisation. The framing is simplified, but useful: raising throughput by demanding expensive hardware may reduce the number of people able to validate the chain; keeping validation accessible can constrain raw throughput.
Why it matters to a trader or user
- Fees: base-layer congestion can make transfers and DeFi activity expensive.
- Finality: settlement speed affects when deposits or withdrawals are treated as complete.
- Exchange operations: venues may pause deposits/withdrawals during upgrades or instability.
- Token economics: some L1 tokens are used for fees, staking and security, linking network usage to token demand — but not guaranteeing value appreciation.
Quick checkpoint
- What problem is this mechanism trying to solve?
- Where does execution happen and where does settlement or finality come from?
- Which new operational, bridge, sequencing or consensus risks appear?
Common misunderstandings
- Cheaper does not automatically mean safer. Lower fees can come with different trust, bridge, sequencer or validator assumptions.
- “Scaling” is not one technology. L1 upgrades, L2 rollups and sidechains solve throughput constraints in different ways.
- Token price and network quality are separate questions. A technically strong network can still have poor token economics, and the reverse can also be true.
FAQ
Is every blockchain a Layer 1?
No. A Layer 1 is the base chain. Rollups and other networks can operate above or alongside an L1 and may rely on it to varying degrees.
Does a faster L1 automatically beat Layer 2s?
No. Speed is only one dimension. Security assumptions, decentralisation, data availability, ecosystem depth and application compatibility also matter.
Can an L1 use L2s as well?
Yes. A base layer can improve itself while also supporting higher-layer scaling systems.
Summary
The useful question is not simply whether a network is “fast”. Compare execution, settlement, data availability, consensus, bridge design and operational maturity. Those layers determine how a scaling system behaves when conditions are normal — and when something goes wrong.
Last reviewed: 20 August 2026
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