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What is a CDK Chain?

What is a CDK Chain?

A CDK Chain generally refers to a blockchain that is developed and launched using a Chain Development Kit (CDK)—specifically, within the context of the Polygon ecosystem, “CDK Chain” most commonly signifies a chain built with the Polygon Chain Development Kit.

Polygon CDK Overview

Polygon CDK is a modular, open-source toolkit that enables developers to quickly deploy, customize, and operate new Layer 2 (L2) blockchains on Ethereum using zero-knowledge rollup (zk-rollup) technology—most notably, the zkEVM protocol. CDK Chains can also be configured as validiums (off-chain data availability) and can use a variety of execution environments and data models123.

Key Features

  • Modularity & Flexibility: Developers can customize chain architectures—selecting virtual machines (e.g., zkEVM), modes (rollup or validium), sequencer models (centralized or decentralized), and gas tokens4.
  • zkEVM Integration: Many CDK Chains are zkEVM chains, offering EVM compatibility secured by zero-knowledge proofs, enabling scalable and private computation42.
  • Interoperability: All Polygon CDK Chains are natively interoperable with each other and Ethereum, connected via Polygon's Interop Layer and optionally AggLayer, allowing seamless cross-chain transactions and shared liquidity5627.
  • Shared Liquidity: Immediate composability across the “Value Layer,” a mesh of CDK Chains and Ethereum, ensuring users are not siloed on a single app or chain56.
  • Scalability & Efficiency: zk-rollup and validium options allow for high throughput, reduced transaction fees, and fast withdrawals to Ethereum (minutes, not days)57.
  • Future-Proof: Chains built with Polygon CDK automatically receive Polygon’s ZK advancements, keeping them secure and up-to-date63.
  • Multiple Use Cases: DeFi, gaming, enterprise tokenization, restaking L2s, digital asset management apps, and more—all are being developed as CDK Chains8910.

Examples of CDK Chains Building with Polygon CDK

ProjectFocus Area
X LayerL2, unified liquidity
Immutable zkEVMGas-free gaming
SwellRestaking L2, DeFi
LibreInstitutional tokenization
zkFairCommunity-owned L2
ArianeeDigital product passports
MoonveilGaming infrastructure
API3Oracle extractable value
8910

How it Works (Technical Anatomy)

Polygon 2.0’s CDK comprises several pluggable components:
  • Virtual Machine: Often zkEVM, but can be adapted.
  • Mode: Rollup (on-chain data) or validium (off-chain data).
  • Data Availability: Solutions like Data Availability Committees (DAC).
  • Sequencer: Centralized or decentralized transaction ordering.
  • Gas Token: Can be MATIC, ETH, or custom tokens4.

Related Innovations

  • CDK Erigon: An optimized version of the Erigon client for zkEVM, enabling more efficient transaction processing and data handling for CDK Chains11.
  • AggLayer: An interoperability protocol enabling even more seamless cross-chain operations and integrated liquidity7.
CDK Chains are central to the future of modular and composable web3 infrastructures, allowing any developer to spin up highly customizable, Ethereum-secured chains that remain interoperable within a vast rollup ecosystem1623.
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