Layer 1 (L1) blockchain is the elemental community of the blockchain ecosystem. It operates independently with out counting on different chains for validation or execution, dealing with every thing from transaction processing to consensus to storing information by itself ledger.
The layer 1 blockchain, sometimes called the mainnet or fee layer, types the bottom ground on which all different blockchain layers are constructed, together with sidechains and layer 2.
Layer 1 is impartial when Layer 2 extends efficiency over an present community. They outline their very own guidelines, run their very own validators, and concern their very own native tokens. Bitcoin, Ethereum, Solana, Cardano, and Avalanche all match this description.
On this article, we’ll have a look at the historical past and performance of Web3’s foundational layer.
Inside Layer 1: The right way to Construct Layer 1
All L1 blockchains embody a number of core parts that make them each useful and safe.
- Community node: Hundreds of impartial computer systems preserve similar copies of the blockchain and broadcast information to one another. The decentralized nature prevents censorship and single factors of failure.
- Consensus layer: A rulebook for consensus. This determines how members resolve which transactions are legitimate and the way blocks are added to the chain.
- Execution layer: On high of programmable blockchains like Ethereum and Solana, this layer executes good contracts, or self-executing code that powers decentralized apps and automatic transactions.
- Native cryptocurrency: Every L1 has its personal coin that pays transaction charges, rewards validators, and helps on-chain governance. BTC secures Bitcoin, ETH powers Ethereum, and ADA powers Cardano.
How Layer 1 processes transactions
The flows are virtually the identical between completely different networks.
- verification: Transactions are checked to make sure they meet protocol guidelines and have correct signatures and balances.
- Block formation: Validated transactions are bundled into candidate blocks.
- consensus: The nodes agree on which block so as to add subsequent utilizing an algorithm chosen by the community.
- Finality: As soon as confirmed, the block turns into immutable. Stability and contract information are up to date through the community.
This cycle repeats constantly, 1000’s of instances a day, with none central oversight.
Consensus mechanism: the center of blockchain
The consensus mechanism defines how a blockchain reaches consensus, shaping its velocity, safety, and vitality profile. Varied consensus mechanisms exist, however the primary ones are:
- proof of labor (Prisoner of Warfare)– Launched by Bitcoin, PoW miners clear up cryptographic puzzles by way of computation. Though very safe, it consumes lots of vitality and is restricted to roughly 7 transactions per second (TPS).
- proof of stake (PoS)– Validators lock tokens as collateral to earn the correct to validate blocks. Change vitality use with financial incentives.
- Delegated Proof of Stake (DPoS)–This mannequin, utilized by Binance Good Chain and others, depends on a small, chosen set of validators to enhance effectivity, buying and selling off velocity and decentralization.
- proof of historical past (PoH)–Solana’s proprietary system timestamps transactions earlier than consensus, enabling 1000’s of TPS and sub-second block instances.
Primary Layer 1 Blockchain
Bitcoin (BTC) – Proof of Work: The primary and most safe blockchain. It makes use of energy-intensive mining to course of round 7 TPS and emphasizes decentralization and immutability over velocity.
Ethereum (Ethereum) – Proof of Stake: The biggest programmable blockchain supporting good contracts, NFTs, and DeFi. After the 2022 merge, we decreased vitality utilization by over 99% whereas laying the muse for scalability with rollups and future sharding.
Solana (sol) – Proof of Historical past + PoS: Recognized for its excessive throughput and low charges, Solana timestamps transactions earlier than reaching consensus, reaching sub-second block instances.
Cardano (ADA) – Ouroboros Proof of Stake: A research-driven blockchain that emphasizes formal verification and a layered structure to separate settlement and computation.
avalanche(Abax) – Avalanche Consensus: Makes use of stochastic sampling to rapidly attain consensus. It gives sub-second finality and helps customizable subnets for app-specific chains.
Binance Good Chain (BNB) – Delegated Proof of Stake: Operated by a restricted set of validators, BSC trades decentralization for efficiency, providing quick and low-cost transactions which might be appropriate with Ethereum’s instruments.
Timeline: Key Layer 1 Milestones
- January 2009: Bitcoin launches as the primary absolutely useful blockchain to show decentralized consensus by way of proof of labor.
- July 2015: Ethereum goes dwell, introducing programmable, Turing-complete good contracts to the blockchain ecosystem.
- September 2017: Cardano launches Byron mainnet, formalizes proof of stake utilizing the Ouroboros protocol and establishes a layered structure.
- September 2020: Avalanche launches mainnet and introduces a quick consensus mechanism and subnet framework for customizable chains.
- September 2022: Ethereum completes the merge, transferring from Proof of Work to Proof of Stake, decreasing vitality consumption by over 99%.
- October 2023: Celestia is being launched as the primary modular blockchain centered on information availability and consensus separation.
- August 2025: Circle introduced Arc, a layer 1 centered on stablecoins, with a public testnet launching in October and mainnet anticipated in 2026.
Every blockchain goals to handle the identical elementary problem: the blockchain trilemma.
Blockchain trilemma
Ethereum co-founder Vitalik Buterin coined the time period “blockchain trilemma” in 2017 to explain the problem of blockchain’s incapability to concurrently maximize decentralization, scalability, and safety, forcing trade-offs between these three.
- security – Safety towards manipulation and assaults.
- Scalability – Potential to deal with giant volumes effectively.
- decentralization – Distribution of management throughout many impartial nodes.
Layer 1 scaling
Builders are regularly in search of methods to extend blockchain throughput with out compromising decentralization, a direct response to the blockchain trilemma.
- Sharding: This method divides the community into smaller components (shards) and processes information in parallel to scale back node workload and improve capability. Ethereum initially deliberate for 64 shards, however by late 2025 they’d shifted their focus to protodunk sharding and dank sharding. The improve was centered round information availability for layer 2 rollups somewhat than full on-chain execution. Proto dank sharding (EIP-4844) introduces information blobs to enhance storage effectivity, however full dank sharding continues to be in improvement.
- Consensus optimization: Shifting from energy-intensive Proof of Work to Proof of Stake, like Ethereum’s 2022 Merge, drastically improves effectivity. Some new networks combine or adapt consensus fashions to steadiness velocity, price, and safety.
- Block parameters: Bigger blocks and shorter spacing enhance throughput, however on the danger of centralization. Bigger blocks require extra bandwidth and storage. Quicker blocks introduce synchronization points and the variety of orphaned blocks.
- Protocol improve: Bitcoin’s 2017 Segregated Witness (SegWit) is a traditional instance of direct layer 1 scaling. SegWit frees up block house by separating signature (“witness”) information from transaction information, permitting extra transactions per block with out growing measurement.
actual world purposes
Layer 1 blockchain has supported DeFi and powered lending, exchanges, and stablecoins by way of good contracts. Ethereum and Solana allow NFTs and gaming, bringing digital possession on-chain. It additionally improves provide chain transparency, secures digital identities, and permits the tokenization of real-world property equivalent to property and artwork.
Why are they nonetheless vital?
Layer 2 and sidechains may help improve velocity, however Layer 1 stays the supply of reality. They supply a last decision, an unchanging historical past, and a shared belief for all that’s constructed on them.
Blockchain know-how has superior far past its inception in 2009, and efforts will not be slowing down. In November, the Ethereum Basis introduced its subsequent main step: the Ethereum Interoperability Layer. This enables Ethereum L2s to immediately talk with different L2s.
As blockchain know-how evolves, from energy-intensive mining to modular, quantum-resistant architectures, Layer 1 blockchain continues to outline the infrastructure of the decentralized web.
