Layer 3
A Layer 3 is an application-specific blockchain layer built on top of a Layer 2 to add customization, scalability, or specialized features.
A Layer 3 is a blockchain layer built above a Layer 2 network, usually to serve a specific application, game, exchange, community, or use case. While Layer 1 networks such as Ethereum provide base security and settlement, and Layer 2 networks help scale transactions more cheaply, a Layer 3 can add another level of customization. This might include its own rules for fees, privacy, identity, transaction speed, or app-specific logic while still relying on lower layers for security or final settlement.
Layer 3 matters because it lets developers create more tailored crypto experiences without building a completely separate blockchain from scratch. For example, a gaming project might use a Layer 3 so in-game trades and actions are fast and inexpensive, while the underlying Layer 2 handles broader scaling and the Layer 1 provides final trust assumptions. A simple comparison is a shopping mall: Layer 1 is the land and utilities, Layer 2 is the mall structure, and Layer 3 is a specialized store designed for one type of customer experience.
Other terms in Layer 2 & Scaling
Data Availability
The assurance that the transaction data needed to verify a blockchain or layer 2 network can be accessed by anyone who needs it.
Fraud Proof
A fraud proof is evidence submitted to a blockchain to show that a proposed transaction result or rollup state is invalid.
Layer 2
A Layer 2 is a secondary network or protocol built on top of a blockchain to process transactions faster and cheaper while relying on the main chain for security.
Modular Blockchain
A blockchain design that splits core jobs like execution, settlement, consensus, and data availability across separate specialized layers.