Layer 0: understanding the foundations of blockchain
Updated on 30 July 2026
Layer 0 is the lowest infrastructure layer of the blockchain: it covers the hardware and network protocols that Layer 1 blockchains such as Bitcoin and Ethereum rely on, ensuring their security, resilience and interoperability with one another.
- Layer 0 covers the hardware and network protocols (cabling, nodes, network cards) that transmit data between the participants in a blockchain.
- Projects such as Cosmos and Polkadot use Layer 0 to let different blockchains communicate and exchange value with one another.
- Layer 0 is distinct from Layer 1 (Bitcoin, Ethereum), which handles consensus and transactions, and from Layer 2, which improves their scalability.
Definition of layer 0
The foundation of blockchains
Layer 0 is the infrastructure on which Layer 1 blockchains are built. It serves as the base for the layers above it and contributes to how they function. Like internet protocols, Layer 0 plays a major role in the blockchain ecosystem, since it ensures the stability and reliability of the systems built on top of it. To invest in these Layer 1 blockchains, investors then need to go through a broker or an exchange.
Layer 0 covers all the hardware and communication protocols used to transmit data between the nodes of a blockchain network. This includes elements such as the physical layer, the data link layer and the bit stream. As a result, it ensures the flexibility and scalability of blockchain networks, adapting performance to the needs of users and the system. These exchanges also rely on networking models such as LAN (Local Area Network) and MAN (Metropolitan Area Network).
Distinguishing layer 0 from other layers
The distinction between the different layers (Layer 0, Layer 1, Layer 2 and Layer 3) is essential to understanding how blockchains work and how they evolve. Layer 0 is the lowest and most fundamental layer. As such, it is responsible for transmitting information across the network.
As for Layer 1, it covers consensus protocols, blockchain management and transaction integration. Layer 2 solutions are protocols built on top of Layer 1 to improve performance and scalability, such as payment channels and secondary chain networks. Finally, Layer 3 consists of the applications and services built on the blockchain, such as smart contracts and decentralised applications (dApps).
Layer 0 protocols can differ in terms of PIN, bit and versions such as v2, v4 and v6. They can also have specific default settings to ensure the system works properly. Layer 0 protocols help create a secure, stable and scalable environment for the development and growth of blockchain networks.
The problems layer 0 can solve
Interoperability
Layer 0 addresses the question of interoperability by enabling communication between different blockchain networks. This interoperability makes it easier to exchange information and value between various blockchains, particularly for smart contracts and decentralised applications (dApps). As a result, users benefit from a smoother experience and developers can leverage the features of several blockchains to build innovative products and services. Tools such as Finary also make it possible to track the performance of your cryptocurrencies in one place, alongside your other assets.
Scalability
Monolithic blockchains, such as Ethereum, face scalability challenges that limit their ability to process a large number of transactions at once. Layer 0 offers solutions to these challenges by spreading the workload across several blockchains, which increases the system's overall capacity. For example, the proof-of-stake mechanism can be used to encourage participating nodes to help maintain network stability and ensure a smoother, more efficient transition as the number of users grows, a mechanism similar to the one used for crypto staking.
Flexibility for developers
Layer 0 makes it easier to develop specific blockchain software by offering development kits and interfaces suited to developers' needs. These tools let developers build decentralised applications and smart contracts tailored to various industries, while remaining interoperable with other blockchains in the ecosystem. In this way, Layer 0 fosters growth and innovation in blockchain technology and the cryptocurrency space.
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Investing carries risks, including the risk of capital loss. Crypto-assets are highly volatile: you may lose all or part of your investment. Past performance is not a reliable indicator of future performance. Finary is authorised as a Crypto-Asset Service Provider (CASP, "PSCA" in French) under the MiCA regime by the AMF.
How a layer 0 protocol works
Basic principles
Layer 0, or the zero layer, is a relatively new concept in blockchain protocols, offering advanced features to improve scalability, security and the user experience. State channels and data validation play a crucial role in how Layer 0 protocols work, facilitating communication between the different nodes and connected devices of a network. Nodes are responsible for maintaining consensus through various techniques, ensuring data integrity and network stability.
With the emergence of Layer 0 protocols, projects such as Ethereum can better handle congestion issues, which improves the user experience. This also makes it possible to build more robust networks with varied topologies, including WAN (Wide Area Network), BAN (Body Area Network) and wired networks.
Notable examples
Several notable projects use Layer 0 technologies to offer innovative solutions within the blockchain ecosystem, as part of the cryptocurrency ecosystem:
- Cosmos - A network of independent, interoperable blockchains that aims to simplify and improve scalability, governance and security.
- Polkadot - A multi-chain platform that lets blockchains connect and share features such as data transmission and smart contracts.
- Avalanche - A platform that lets you launch custom Layer 1 blockchains (subnets) connected to a shared primary chain; some classify it as Layer 0 for this shared-infrastructure role, although Avalanche officially positions itself as a Layer 1 platform.
The future of layer 0 protocols
Innovation potential
Layer 0 is a set of network protocols and technologies with the potential to transform the blockchain industry by tackling technical and adoption challenges, as the ecosystem's market cap grows. These protocols are based on physical components such as cabling, network interface cards and various frequencies. Their ability to harness these resources offers wide-ranging innovation potential and opens up new opportunities for developers and users.
The development of Layer 0 protocols helps improve the performance and security of blockchains. As a result, these improvements could encourage wider adoption of blockchain technologies across various sectors of the economy.
Importance for developers and users
Layer 0 protocols are also appealing to developers, who can build innovative solutions based on these new technologies. By offering better performance and greater scalability, Layer 0 protocols let developers create more complex and varied applications, while meeting requirements for speed and security.
As for users, they stand to benefit from the technical contributions of Layer 0 protocols. Thanks to more efficient and more secure networks, they could enjoy a better user experience and use blockchain-based applications with greater confidence.
In short, Layer 0 protocols offer considerable innovation potential for the blockchain industry and can play a crucial role for developers and users alike. That said, it is worth noting that their adoption and deployment will require overcoming certain technical and adoption challenges.
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Investing carries risks, including the risk of capital loss. Crypto-assets are highly volatile: you may lose all or part of your investment. Past performance is not a reliable indicator of future performance. Finary is authorised as a Crypto-Asset Service Provider (CASP, "PSCA" in French) under the MiCA regime by the AMF.
Frequently asked questions
What are the main Layer 0 projects?
The main Layer 0 projects include Polkadot, Cosmos and Substrate. These projects provide a communication and interoperability protocol between different blockchains, creating an ecosystem of heterogeneous, interoperable blockchains.
How does a Layer 0 protocol work?
A Layer 0 protocol works by enabling communication between different blockchains, public or private, through specific interoperability mechanisms: message passing, token exchange, or verifying the state of other chains.
What is the difference between Layer 0 and Layer 1?
Layer 0 is the base layer that covers the communication and interoperability protocols between blockchains, while Layer 1 is the next layer, made up of individual blockchains with their own consensus and security mechanisms.
What are the advantages of Layer 0 projects?
The advantages of Layer 0 projects include interoperability between blockchains, easier exchange between chains, as well as scalability and modularity. Developers can build dApps capable of running on multiple blockchains, and users can use their digital assets more efficiently.
What challenges do Layer 0 projects face?
The challenges facing Layer 0 projects include maintaining security and decentralisation while enabling interoperability between different blockchains, compatibility between varied architectures and consensus protocols, as well as adoption and integration within the blockchain ecosystem.
Sources
Cosmos, official presentation of the interoperable blockchain network
Polkadot, official multi-chain platform
Substrate, official documentation for the blockchain development framework
LayerZero, official omnichain interoperability protocol
AMF, PSCA whitelist, Finary SAS
Regulatory disclaimers: Marketing communication. Investing carries a risk of partial or total capital loss. Past performance is not a reliable indicator of future performance. This article is provided for information and educational purposes only; it does not constitute personalised investment advice, a buy or sell recommendation, or tax advice. Crypto-assets are highly volatile and carry a risk of total loss of capital. They benefit from no capital guarantee and are not covered by deposit guarantee or investor compensation schemes. Before investing, read the Key Information Document (KID) and, where relevant, consult an authorised adviser. Finary SAS, an investment firm authorised by the ACPR (no. 19283), member of AMAFI. Insurance broker registered with ORIAS (no. 21001279), member of the CNCGP (association approved by the AMF). Crypto-Asset Service Provider (CASP) authorised by the AMF under the MiCA regime, references no. A2026-026 and no. N2026-008.
