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What is a blockchain network

What is a blockchain network

A blockchain network is a distributed system of computers (nodes) that collectively maintain a shared, tamper-resistant ledger of transactions. Each node holds a copy of the ledger, and the network uses a consensus mechanism to agree on which new transactions are valid. No single entity controls the ledger — it is maintained by the network's participants according to the protocol's rules.

In short: a blockchain network is the infrastructure layer — the "where" of crypto. Tokens run on networks, applications deploy to networks, and the network's properties (speed, cost, security model, consensus) shape what can be built on top of it.

How a blockchain network works

At its core, a blockchain network operates through a simple cycle:

  1. Users submit transactions. A transaction can be a token transfer, a smart contract call, or any other operation the network supports.
  2. Nodes propagate transactions. The transaction is broadcast to the network's nodes, which validate its format and basic rules (e.g., does the sender have sufficient balance?).
  3. Consensus produces blocks. A subset of nodes (validators, miners, or equivalent roles depending on the consensus mechanism) collects valid transactions into a block. The network agrees on which block to add next through its consensus protocol.
  4. The block is appended to the chain. Once consensus is reached, the new block is added to the chain and becomes part of the permanent record. All nodes update their copy of the ledger.
  5. State is updated. Account balances, smart contract states, and other data reflect the transactions in the new block.

This cycle repeats continuously. The result is a shared, append-only ledger that no single participant can unilaterally alter.

Different networks implement this cycle differently. Ethereum uses Proof of Stake validators that propose and attest to blocks. Solana uses a combination of Proof of Stake and Proof of History for high throughput. Bittensor uses a specialized consensus designed for AI model evaluation. The underlying principle — distributed agreement on a shared ledger — is the same.

How a network differs from a token and an application

These three concepts are often confused, especially by newcomers. They are distinct layers:

Layer What it is Example
Network The infrastructure — the blockchain itself, its nodes, consensus, and protocol rules Ethereum, Solana, Base, Arbitrum One, Bittensor, Avalanche, Polygon
Token A digital asset that exists on a network — it follows the network's rules and uses its infrastructure ETH (on Ethereum), SOL (on Solana), BNB (on BNB Smart Chain)
Application A program (smart contract or dApp) deployed on a network that uses the network's infrastructure to operate A DeFi protocol, a game, an AI agent platform

A useful analogy: the network is the road system, tokens are the vehicles that travel on the roads, and applications are the destinations (shops, offices, services) built along the roads. You need the road system to exist before vehicles can travel or destinations can operate.

This distinction matters because:

  • A token's properties are partly determined by the network it runs on (transaction speed, cost, security model).
  • An application's capabilities are constrained by the network's features (does it support smart contracts? What programming language? What throughput?).
  • The same token standard (e.g., ERC-20) can exist on multiple networks if they share compatible architecture (e.g., EVM-compatible chains).

Types of blockchain networks

Blockchain networks are commonly classified along several dimensions:

By layer

  • Layer 1 (L1) — a standalone, sovereign blockchain with its own consensus mechanism and security model. Examples: Ethereum, Solana, Avalanche, Bittensor.
  • Layer 2 (L2) — a network built on top of an L1 that inherits its security but processes transactions separately for greater speed or lower cost. Examples: Base, Arbitrum One, Polygon zkEVM.

By architecture

  • EVM-compatible — networks that run the Ethereum Virtual Machine, allowing developers to deploy the same smart contracts across multiple chains. Examples: Ethereum, BNB Smart Chain, Base, Arbitrum One, Avalanche C-Chain, Polygon.
  • Non-EVM — networks with their own virtual machines and programming models. Examples: Solana (SVM/Rust), Bittensor (substrate-based).
  • Appchains — purpose-built blockchains designed for a single application or use case, often built using modular frameworks like Cosmos SDK or Substrate.

By consensus

  • Proof of Stake (PoS) — validators stake tokens as collateral to participate in block production. Used by Ethereum, Solana, Polygon, and others.
  • Proof of Work (PoW) — miners solve computational puzzles to produce blocks. Used historically by Ethereum (pre-Merge) and still by Bitcoin.
  • DPoS — delegated Proof of Stake, where token holders delegate voting power to a smaller set of validators.
  • PoSA — Proof of Staked Authority, combining staking with a fixed validator set. Used by BNB Smart Chain.
  • Specialized consensus — mechanisms designed for specific purposes, such as Bittensor's Yuma Consensus for AI model evaluation.

By purpose

  • General-purpose networks — designed to support any type of application (DeFi, gaming, AI, social, etc.). Most major L1s and L2s fall into this category.
  • Specialized networks — designed for a specific domain or function, such as AI compute networks, data availability layers, or privacy-focused chains.

Where blockchain networks appear in DecAIHub

The blockchain network is one of the most important contextual fields in a DecAIHub project card:

  • Main chain field — records which network(s) a project deploys on or operates through. Values include Ethereum, Solana, Base, Arbitrum One, BNB Smart Chain, Bittensor, Avalanche, Polygon, and others.
  • Type field — indicates the project's execution environment / architecture: EVM (EVM-compatible smart contracts), non-EVM (other contract platforms), or Appchain (the project is its own application-specific chain).
  • Consensus field — for projects that are networks themselves, this records the consensus mechanism.

When reading the Main chain field, you learn:

  • Which infrastructure the project depends on. A project on Ethereum inherits Ethereum's security model. A project on Solana benefits from Solana's throughput but also inherits its outage risks.
  • Which ecosystem the project belongs to. Networks have ecosystems — developer communities, tooling, liquidity pools, and user bases. The choice of network is a strategic decision that shapes who the project's neighbors and potential integrations are.
  • What transaction costs and speeds look like. L2s like Base and Arbitrum One offer lower fees than Ethereum L1. Solana offers high throughput. These properties affect the practical usability of the project.

What a blockchain network alone does not prove

  • Deploying on a reputable network does not prove the project itself is secure, well-built, or trustworthy. The network provides infrastructure; the project builds on top of it.
  • Being on an EVM-compatible chain does not prove the project's smart contracts are correct or audited. Compatibility is a developer convenience, not a security guarantee.
  • Operating on multiple chains does not prove the project is more advanced. Multichain deployment can mean broader reach, but it can also mean a thin presence on each chain with no deep integration.
  • The network's consensus mechanism does not prove the project's token is necessary or well-designed. Consensus is a network-level property; token design is a project-level decision.
  • Having a "mainnet" status does not prove the project is production-ready or widely used. Mainnet means the network is live, not that it has meaningful adoption.

Do not confuse with

  • Token — a digital asset that runs on a network. The network is infrastructure; the token is an asset on that infrastructure. ETH is a token; Ethereum is the network.
  • Application (dApp) — a program deployed on a network. The network provides the execution environment; the dApp provides the user-facing product.
  • Protocol — a set of rules governing how a system operates. A blockchain network implements a protocol, but "protocol" can also refer to application-level rules (e.g., a DeFi protocol running on Ethereum).
  • Ecosystem — the broader community of projects, tools, and users around a network. The network is the technical layer; the ecosystem is the human and economic layer.

Frequently asked questions

How do I know which network a DecAIHub project uses?

Check the Main chain field in the project card. It lists the primary blockchain network(s) the project deploys on or operates through. If the project is itself a network, the Type field reflects its architecture (Appchain for an application-specific sovereign chain, or L1), and the Consensus field describes its consensus mechanism. For L2 projects, the L2 architecture itself is recorded in the Consensus field using a formula such as L2 (Optimistic Rollup, Base on Ethereum).

Does the choice of network affect a project's DecAI Fit?

Not directly. The DecAI Fit framework evaluates AI reality, Onchain necessity, Token necessity, and Evidence. The network choice provides context (is there real on-chain activity? Does the network support the claimed functionality?) but is not a scoring factor by itself. A project with strong on-chain integration on any network scores the same as the equivalent integration on any other network.

What is the difference between L1 and L2?

An L1 is a sovereign blockchain with its own consensus — it does not depend on another chain for security. An L2 is a network built on top of an L1, processing transactions off the L1 for speed and cost benefits while relying on the L1 for final security. Ethereum is an L1; Base and Arbitrum One are L2s built on Ethereum. See the dedicated L1 and L2 explainers for details.

Can a project exist on multiple blockchain networks?

Yes. Many projects deploy on multiple networks (multichain). In DecAIHub, the Main chain field may list multiple networks if the project has meaningful deployments on each. However, multichain presence alone does not indicate quality — what matters is whether the on-chain integration is substantive on each chain.

External references

See also

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