Blockchain technology has changed how people think about digital ownership, payments, applications, and decentralized networks. At the center of this ecosystem are Layer 1 blockchains—the foundational networks that provide the infrastructure required for decentralized transactions and applications.

Bitcoin, Ethereum, Solana, and Avalanche are examples of Layer 1 blockchain networks. Each has its own architecture, consensus mechanism, transaction model, and approach to scalability.

But what exactly is a Layer 1 blockchain, how does it work, and why is it so important?

In this guide, we’ll explain what Layer 1 blockchains are, how they work, their advantages and limitations, the difference between Layer 1 and Layer 2, and why Layer 1 networks remain fundamental to the blockchain ecosystem.

What Is a Layer 1 Blockchain?

A Layer 1 blockchain is the base blockchain network that independently manages transactions, consensus, and the state of its network.

It does not depend on another blockchain to operate.

A Layer 1 network typically provides core functions such as:

• Transaction processing
• Consensus
• Network security
• Data storage
• Transaction settlement
• Native cryptocurrency management
• Smart contract execution, where supported

For example, Bitcoin operates as a Layer 1 blockchain for BTC transactions, while Ethereum provides the underlying blockchain infrastructure for ETH and thousands of decentralized applications.

The term “Layer 1” is particularly useful when discussing scaling solutions built on top of these networks.

Why Are Layer 1 Blockchains Important?

Layer 1 blockchains provide the foundation of decentralized infrastructure.

Without a secure base layer, applications and Layer 2 networks would not have a reliable system for settling transactions and maintaining shared blockchain state.

A strong Layer 1 needs to balance several competing requirements:

• Security
• Decentralization
• Scalability
• Reliability
• Censorship resistance
• Economic sustainability

Improving one characteristic can sometimes create trade-offs elsewhere.

For example, dramatically increasing transaction throughput could increase hardware requirements for validators, potentially making participation more difficult and reducing decentralization.

How Does a Layer 1 Blockchain Work?

Although different blockchains use different architectures, most Layer 1 systems follow a general process.

1. Users Submit Transactions

A user creates and signs a transaction using a cryptocurrency wallet.

The transaction is broadcast to the blockchain network.

2. Nodes Receive Transactions

Network nodes receive transactions and verify basic requirements, such as signatures, balances, and protocol rules.

3. Transactions Are Ordered

Depending on the blockchain, transactions are organized into blocks or another form of ledger structure.

4. Consensus Is Reached

Validators or miners participate in the network’s consensus mechanism.

Consensus determines which transactions are considered valid and how the blockchain’s state should be updated.

5. The Blockchain Is Updated

Once a block or state update is accepted, participating nodes update their copy of the blockchain.

This creates a shared, decentralized record.

What Are the Main Types of Layer 1 Blockchains?

Layer 1 networks differ considerably in how they achieve consensus and process transactions.

Proof of Work Blockchains

Proof of Work (PoW) uses computational work to secure the network.

Bitcoin is the most famous example.

Miners compete to solve computational problems, and successful miners can add new blocks according to the protocol’s rules.

Advantages

• Long-established security model
• Strong decentralization potential
• Well-tested architecture

Disadvantages

• High energy consumption for some implementations
• Limited transaction throughput
• Specialized mining hardware can be expensive

Proof of Stake Blockchains

Proof of Stake (PoS) uses economic incentives rather than energy-intensive mining to secure the network.

Ethereum transitioned from Proof of Work to Proof of Stake in 2022.

Validators lock or “stake” cryptocurrency and participate in network consensus.

Advantages

• Lower energy consumption than PoW
• Economic incentives for network security
• Can support more flexible validator architectures

Disadvantages

• More complex protocol design
• Potential concerns about concentration of stake
• Slashing and validator management introduce additional complexity

Delegated Proof of Stake

Some blockchain networks use variants of Delegated Proof of Stake (DPoS).

Users can delegate voting power to selected validators or representatives.

This can provide fast transaction processing, but the design may involve trade-offs concerning decentralization.

Examples of Layer 1 Blockchains

There are many Layer 1 blockchain networks, each designed with different priorities.

Bitcoin

Bitcoin focuses primarily on decentralized digital money and censorship-resistant value transfer.

Its architecture prioritizes security and decentralization over extremely high transaction throughput.

Ethereum

Ethereum provides a programmable blockchain capable of executing smart contracts.

It serves as infrastructure for decentralized finance, NFTs, DAOs, games, and many Layer 2 networks.

Solana

Solana is designed for high transaction throughput and low-latency applications.

It uses a combination of Proof of Stake and other technologies to support its network architecture.

Avalanche

Avalanche is a Layer 1 ecosystem designed to support decentralized applications and customizable blockchain networks.

These examples demonstrate that there is no single design for a Layer 1 blockchain.

What Is the Blockchain Trilemma?

The blockchain trilemma describes the challenge of balancing three important characteristics:

Security + Decentralization + Scalability

The idea is that maximizing all three simultaneously can be technically difficult.

For example:

• Increasing block size may increase throughput but make running a full node more demanding.
• Reducing validator requirements may increase participation but potentially affect security.
• Increasing transaction processing speed may introduce additional hardware or networking requirements.

Layer 1 developers therefore make architectural choices based on their priorities.

Layer 1 Scalability

Scalability is one of the biggest challenges facing Layer 1 blockchains.

A blockchain needs to process more transactions without sacrificing important properties.

Several approaches can improve Layer 1 scalability.

Larger or More Efficient Blocks

Increasing block capacity can allow more transactions to be processed.

However, larger blocks can increase storage and bandwidth requirements for nodes.

Faster Block Production

Reducing block intervals can potentially increase throughput.

However, validators need enough time to propagate and verify blocks across the network.

Parallel Transaction Execution

Some newer blockchains attempt to execute independent transactions simultaneously.

This can improve computational efficiency when transactions do not depend on one another.

Sharding

Sharding divides certain blockchain workloads into smaller partitions.

Instead of processing all workloads through one execution environment, multiple parts of the network can potentially process activity in parallel.

Modern blockchain designs can use different forms of sharding or data partitioning.

Layer 1 vs. Layer 2

One of the most important distinctions in blockchain technology is the difference between Layer 1 and Layer 2.

Layer 2 solutions are not replacements for Layer 1 networks.

Instead, they are designed to extend the capabilities of the underlying blockchain.

Why Do Layer 1 Networks Need Layer 2?

As blockchain adoption grows, processing every transaction directly on Layer 1 can become expensive.

During periods of high demand, users may experience:

• Higher transaction fees
• Network congestion
• Longer confirmation times
• Limited transaction throughput

Layer 2 networks can process transactions away from the main execution environment and then use Layer 1 for settlement, security, or data availability depending on their architecture.

This allows the ecosystem to scale without requiring every transaction to be executed directly on the base blockchain.

Advantages of Layer 1 Blockchains

Decentralized Infrastructure

A Layer 1 blockchain can provide a permissionless infrastructure where users do not need approval from a central authority to participate, subject to the network’s protocol rules.

Strong Security

Established Layer 1 networks can have large validator or miner communities and substantial economic security.

Independent Consensus

A Layer 1 blockchain maintains its own consensus mechanism rather than depending on another blockchain for final settlement.

Native Digital Assets

Most Layer 1 blockchains have a native cryptocurrency used for transaction fees and, depending on the network, staking, governance, or other economic functions.

Foundation for Web3 Applications

Smart-contract-enabled Layer 1 networks can serve as infrastructure for:

• Decentralized finance
• NFTs
• Blockchain gaming
• DAOs
• Decentralized social networks
• Tokenized assets

Challenges of Layer 1 Blockchains

Despite their importance, Layer 1 networks face several challenges.

Scalability

Processing large numbers of transactions while maintaining decentralization remains difficult.

Transaction Fees

Limited block capacity combined with high demand can increase fees.

Network Congestion

When demand exceeds available capacity, transactions may compete for limited block space.

Hardware Requirements

Some high-throughput blockchain designs can require significant computing, storage, or bandwidth resources from validators.

Governance

Blockchain networks need mechanisms for managing protocol upgrades and resolving disagreements without undermining decentralization.

What Is a Native Token?

Most Layer 1 networks have a native cryptocurrency.

For example:

• Bitcoin → BTC
• Ethereum → ETH
• Solana → SOL
• Avalanche → AVAX

The native asset can serve several purposes depending on the network.

It may be used to:

• Pay transaction fees
• Secure the network through staking
• Reward validators or miners
• Participate in governance
• Transfer value

Native tokens should not be confused with tokens issued by smart contracts on top of a Layer 1.

Layer 1 and Smart Contracts

Not every Layer 1 blockchain supports smart contracts in the same way.

Ethereum was designed as a general-purpose programmable blockchain, allowing developers to deploy smart contracts.

Other networks have developed different programming environments, virtual machines, or execution models.

Smart contracts allow blockchain networks to support applications beyond simple value transfers.

For example, developers can create protocols for:

• Lending
• Trading
• Gaming
• Digital collectibles
• Decentralized organizations
• Token issuance

The Future of Layer 1 Blockchains

Layer 1 networks are continuing to evolve as blockchain adoption expands.

Future development is likely to focus on:

• Higher transaction throughput
• More efficient consensus
• Parallel execution
• Improved data availability
• Better interoperability
• Greater validator decentralization
• More efficient cryptography
• Integration with Layer 2 networks
• Improved developer tooling

Rather than competing directly with Layer 2 networks, many Layer 1 blockchains are increasingly being designed to work as the underlying infrastructure for multiple scaling layers.

Frequently Asked Questions About Layer 1 Blockchains

What is a Layer 1 blockchain?

A Layer 1 blockchain is the base blockchain network that independently manages consensus, transactions, network state, and settlement.

Is Bitcoin a Layer 1 blockchain?

Yes. Bitcoin is a Layer 1 blockchain that maintains its own consensus mechanism and blockchain ledger.

Is Ethereum Layer 1?

Yes. Ethereum is a Layer 1 blockchain and serves as the base settlement and security layer for many applications and Layer 2 networks.

What is the difference between Layer 1 and Layer 2?

Layer 1 is the underlying blockchain, while Layer 2 solutions are built on top of Layer 1 to increase scalability and process additional activity more efficiently.

Are Layer 1 blockchains decentralized?

Many Layer 1 blockchains are designed to be decentralized, but the degree of decentralization varies depending on validator distribution, consensus mechanisms, governance, hardware requirements, and other factors.

Which Layer 1 blockchain is the best?

There is no universally best Layer 1 blockchain. The appropriate network depends on the use case, including security requirements, transaction costs, speed, decentralization, smart contract capabilities, and ecosystem maturity.

Can Layer 1 blockchains scale?

Yes. Layer 1 networks can use techniques such as parallel execution, improved consensus, optimized block processing, data availability improvements, and sharding. Layer 2 solutions can also extend their capacity.

Conclusion

Layer 1 blockchains are the foundation of decentralized blockchain infrastructure.

They provide the core mechanisms required to process transactions, maintain network state, reach consensus, and secure decentralized applications.

Bitcoin, Ethereum, Solana, and other Layer 1 networks demonstrate different approaches to balancing security, decentralization, and scalability.

As blockchain technology matures, Layer 1 networks will continue to evolve. At the same time, Layer 2 solutions, rollups, sharding, and data availability technologies will work alongside them to increase overall capacity.

The future of blockchain scalability is therefore unlikely to depend on a single technology. Instead, it will involve multiple layers and architectures working together to create decentralized networks that are more secure, scalable, affordable, and accessible.