What Is a Layer 1 Blockchain? A Beginner’s Guide

What Is a Layer 1 Blockchain?

A layer 1 blockchain is the base network that processes and finalizes transactions. It is the foundation on which other applications and networks are built. When you send bitcoin or ether, the transaction is recorded on a layer 1 blockchain. The term “layer 1” comes from the idea that these networks are the first layer of a technology stack.

Layer 1 blockchains are also called base chains or mainnets. They provide security, consensus, and data availability. Examples include Bitcoin, Ethereum, and Solana. Each has its own rules for validating transactions and adding new blocks.

How Layer 1 Blockchains Work

At a high level, a layer 1 blockchain is a shared ledger maintained by many computers, called nodes. Nodes follow a set of rules to agree on the order of transactions. This agreement is called consensus.

Different layer 1s use different consensus mechanisms. Bitcoin uses proof of work, where miners compete to solve a mathematical puzzle. Ethereum uses proof of stake, where validators lock up ether as collateral and are chosen to propose blocks. Solana uses a combination of proof of stake and a timing mechanism called proof of history.

Once consensus is reached, transactions are grouped into blocks and added to the chain. Each block references the previous one, creating a permanent record. Changing past transactions would require controlling a majority of the network’s resources, which is designed to be impractical.

Bitcoin

Bitcoin is the first layer 1 blockchain, launched in 2009. It is primarily designed for transferring value. Its supply is capped at 21 million coins, and new blocks are added roughly every 10 minutes. Bitcoin prioritizes security and decentralization over speed. Transactions can be slow and fees can spike when the network is busy.

Ethereum

Ethereum launched in 2015 and added programmable smart contracts. This allows developers to build applications like decentralized exchanges, lending protocols, and stablecoins directly on the base chain. Ethereum blocks are added about every 12 seconds. It is more flexible than Bitcoin but also more complex. Fees, called gas, vary with network demand.

Solana

Solana launched in 2020 and focuses on high throughput and low fees. It can process thousands of transactions per second in ideal conditions. To achieve this, Solana uses a different architecture that requires more powerful hardware for validators. This trade-off can make the network less decentralized than Bitcoin or Ethereum.

The Scalability Trade-Off

All layer 1 blockchains face a trade-off between scalability, security, and decentralization. This is often called the blockchain trilemma. Improving one often comes at the expense of another.

• Scalability means handling more transactions per second at lower cost.
• Security means resisting attacks and preventing unauthorized changes.
• Decentralization means many independent participants validate the network, so no single party controls it.

Bitcoin and Ethereum lean toward security and decentralization, which limits their base-layer throughput. Solana leans toward scalability, which can reduce the number of independent validators. There is no perfect balance; each network makes different choices.

Layer 1 vs. Layer 2

A layer 2 is a separate network built on top of a layer 1. It processes transactions off the base chain and then posts compressed data or proofs back to the layer 1 for final settlement. This can increase capacity and reduce fees while inheriting the security of the base chain.

Examples of layer 2s include rollups on Ethereum, such as Arbitrum and Optimism. They execute transactions outside the main chain but rely on Ethereum for security and dispute resolution. In contrast, a layer 1 like Solana handles everything on its own base layer.

The key difference: a layer 1 provides its own security and consensus. A layer 2 depends on a layer 1 for those properties.

Practical Examples: Using a Layer 1

If you want to send or receive crypto on a layer 1, here are typical steps:

1. Choose a network. Decide whether you need Bitcoin for value transfer or Ethereum for smart contracts. Consider fees and speed.
2. Get a wallet. Use a software or hardware wallet that supports the network. For Ethereum, wallets like MetaMask work; for Bitcoin, wallets like Electrum or hardware wallets are common.
3. Acquire the native token. You need the network’s token to pay fees. For Bitcoin, that is BTC; for Ethereum, ETH; for Solana, SOL.
4. Send a transaction. Enter the recipient’s address, choose a fee, and confirm. The transaction will be broadcast to nodes and included in a block.
5. Wait for confirmation. Bitcoin typically needs a few confirmations for finality; Ethereum and Solana confirm faster but may still require waiting for finality.

For example, as of September 30, 2026, a simple ETH transfer on Ethereum can cost anywhere from a few cents to a few dollars in gas, depending on network demand, while a SOL transfer on Solana costs a fraction of a cent. These fees fluctuate with network demand.

Common Mistakes and Risks

New users often run into avoidable problems. Here are some common mistakes:

• Sending to the wrong network. If you send ETH to a Bitcoin address, or SOL to an Ethereum address, the funds may be lost. Always double-check the network and address.
• Underpaying fees. On busy networks, low fees can cause long delays or failed transactions. Wallets usually suggest a fee, but you can adjust it.
• Assuming all layer 1s are the same. Each has different rules, wallet support, and security assumptions. Research before using a new chain.
• Ignoring centralization risks. Some layer 1s have fewer validators or more concentrated mining power. This can affect censorship resistance and security.
• Falling for hype. High throughput claims may not hold under real-world conditions. Test with small amounts first.

Also note that layer 1 tokens can be volatile. Never invest more than you can afford to lose. This article is not financial advice.

Summary

A layer 1 blockchain is the base network that settles transactions and provides security. Bitcoin, Ethereum, and Solana are leading examples, each with different trade-offs in speed, cost, and decentralization. Layer 2s build on top of layer 1s to scale them while relying on the base chain for security. Understanding these differences helps you choose the right network for your needs and avoid common pitfalls.

Disclaimer: This article is for information only and is not investment, financial or trading advice. Cryptocurrency prices are highly volatile. Always do your own research.