Layer-1 blockchains are the base networks that execute and confirm transactions directly on-chain. Networks such as Bitcoin and Ethereum do not depend on another blockchain to process transfers or issue their native assets. That is why L1 is commonly treated as the foundation of a crypto system.
A blockchain itself is maintained by a network of nodes that process information block by block. Each block is added to a permanent ledger, and changes require agreement from a majority of nodes. A network with many nodes can become harder to censor or attack. In contrast with Layer-2 systems, which are designed to relieve pressure from the base chain, Layer-1 remains the main execution, security, and settlement layer of the network.
Why Layer 1 sits at the center of a blockchain network
One defining feature of L1 is independence. A project built directly on a layer-1 chain can create its own governance and security rules without relying on another blockchain layer for core functions. That gives L1 chains a foundational role in decentralization and network security.
Another core trait is the use of a native cryptocurrency. Whether users are paying transaction fees, staking, or taking part in governance, the chain generally uses its own token rather than requiring a separate asset. This keeps economic activity and network operations inside the same system.
Consensus mechanisms are also central to layer-1 design. The source highlights two major examples: Bitcoin uses Proof-of-Work, while Ethereum uses Proof of Stake. Nodes follow these consensus rules to validate transactions and preserve network integrity. Community-driven governance adds another layer, with stakeholders participating in votes that shape important project decisions.
How Bitcoin, Ethereum, and BSC fit the L1 model
The source names three major layer-1 blockchains. Bitcoin, launched in 2009 by the pseudonymous Satoshi Nakamoto, runs on Proof-of-Work and focuses on peer-to-peer transactions backed by strong security. It operates without a third party, which is a major reason it remains one of the best-known blockchain networks.
Ethereum expanded the role of blockchains by introducing smart contracts, making it possible for developers to build dApps directly on-chain. That shifted blockchain use beyond simple payments and into programmable applications. The source also notes that Ethereum’s move to PoS improved scalability while cutting energy consumption.
Binance Smart Chain, or BSC, is described as a layer-1 network focused on low transaction costs and high performance. Its faster transaction speeds and easier user experience helped it gain traction in DeFi, while also making it attractive for newer projects building on a base-layer chain.
Scaling remains a live challenge for L1 chains
Layer-1 blockchains are fundamental to decentralized technology, but they still face pressure as transaction volume and user adoption grow. The source points to rising fees and latency as key issues that appear when demand increases, which is why many L1 networks continue to revise their architecture and consensus models.
Some chains are experimenting with or adopting mechanisms such as Proof of Stake and sharding to lower fees and reduce delays. Even so, major layer-1 networks such as Bitcoin and Ethereum are still turning to Layer-2 systems for a broader set of scaling solutions. The source says there are over 100 L1 blockchains in operation today, and elsewhere refers to at least 130, with that number still growing.
From transaction execution to final settlement, Layer 1 remains the part of the stack that allows a blockchain network to function on its own.