Lesson 0 of 1Coins and Blockchains1 min read

Introduction to Appchains (Application-Specific Blockchains)

An appchain is a blockchain customized around the needs of a single application, optimized for performance, fees, consensus, and smart contracts. It exchanges dedicated resources for greater flexibility and scalability, but differs from general-purpose chains and sidechains that serve multiple applications.

What Is an Appchain

An appchain is a dedicated blockchain designed for a specific application or function. Compared with general-purpose blockchains that host multiple applications, it can tailor transaction processing, fees, smart contracts, and consensus mechanisms around the target application, concentrating computing and network resources on related tasks.

How the Five-Layer Architecture Works Together

A mature appchain typically consists of five layers: network, application, data, consensus, and smart contract. The network layer connects nodes, the application layer hosts applications, the data layer stores state and transactions, the consensus layer enables participants to confirm a common result, and the smart contract layer handles the automatic verification and execution of contracts.

Key Advantages and Differences

Dedicated resources help increase throughput and reduce latency, modular architecture makes it easier to combine functions according to application needs, and interoperability design supports information exchange between different applications. Compared with Layer 1, appchains are easier to customize; compared with sidechains, they typically focus on a single application rather than handling multiple tasks.

Common Implementations

Polkadot parachains connect to the Relay Chain and share its security guarantees while customizing their own governance and functionality; Avalanche subnets are maintained by their respective validator sets; Cosmos zones are independent blockchains connected to the Cosmos Hub and transmit data between networks through the IBC protocol.

Original Tutorial

https://www.binance.com/zh-CN/academy/articles/what-are-appchains-application-specific-blockchains

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Related terms

Key concepts used in this lesson.

Consensus layer
An architectural layer responsible for implementing consensus algorithms such as PoW and PoS, enabling network participants to reach agreement on the state of the blockchain.
Application chain
A blockchain designed specifically for a single application or a particular function, with parameters and resource configurations that can be customized to meet its requirements.
Data Layer
An architectural layer responsible for organizing and storing blockchain state, transaction details, and smart contract data.
Smart Contract Layer
The architectural layer responsible for smart contract automation, verification, and execution.
Network Layer
An architectural layer responsible for peer-to-peer networking functions, enabling nodes to communicate, exchange data, and participate in transaction validation.

More terms