Key takeaways

• Modular blockchains break apart execution, consensus, and data availability into independent layers, boosting performance and flexibility.
• Movement brings Move-based smart contract functionality to new chains, offering memory-safe, resource-constrained execution.
• Eclipse uses Solana’s high-speed VM for execution while settling to Ethereum, blending speed with security guarantees.
• Avail provides data availability as a service layer, enabling lightweight chains to offload costly infrastructure components..

Why Modularity is The Future of Blockchain Design

Traditional blockchains like Bitcoin and Ethereum handle everything—execution, consensus, and data availability—on a single layer. This all-in-one setup works well for security, but it often struggles to scale and adapt as demands grow.

Modular blockchains take a different route. They separate these core tasks into specialized layers. Execution layers handle the processing of transactions, while data availability (DA) layers focus on storing and verifying transaction data. Each component can improve on its own, without affecting the others.

Platforms like Celestia and Avail showcase this modular model. They provide DA services that plug into different execution environments, letting developers build flexible blockchain stacks. This not only boosts scalability but also unlocks new ways to customize infrastructure for gaming, DeFi, or enterprise apps.

Other modular projects like Dymension and Polygon’s AggLayer complement Celestia and Avail by enabling rollup ecosystems and cross-chain aggregation. Data availability sampling, used by Celestia and Avail, allows light clients to verify data with minimal resources, enhancing scalability. For example, a gaming chain could use Avail for DA and Movement for secure execution, optimizing for low-latency transactions

Movement: Bringing Smart Contracts to Move-Based Chains

Movement labs is pushing the Move programming language—originally developed for Meta’s Diem project—into the heart of modular blockchain ecosystems. Unlike Solidity (used in Ethereum), Move is resource-oriented, meaning every asset is treated as a unique object. This design prevents common vulnerabilities like double-spends or reentrancy attacks by default (Bitrue). 

What movement is doing goes beyond reusing a language. They’re building Move-compatible execution environments that can plug into different blockchain stacks. Developers can spin up Move-based rollups or execution layers tailored to their needs—whether on Ethereum, Celestia, or any DA layer.

This unlocks interoperability and scalability. Instead of being tied to a single chain like Aptos or Sui, Move smart contracts can now go modular. Developers gain the security benefits of Move without giving up flexibility.

Movement Labs has developed a Move-EVM bridge, enabling Ethereum developers to deploy Move smart contracts, with testnets live on Celestia and Avail. Their Parallelized Move VM (MVM) boosts transaction throughput, making it ideal for high-performance rollups. These Move-based rollups integrate seamlessly with modular DA layers, offering developers flexibility across blockchain stacks.

In short, Movement is making it easier to use one of the most secure smart contract languages—anywhere in the modular blockchain stack.

Eclipse: A Layer 2 That Uses Solana’s VM Over Ethereum’s Settlement

Eclipse is a modular Layer 2 blockchain that combines the parallel-processing speed of Solana’s Sealevel Virtual Machine (SVM) with the settlement security of Ethereum. The SVM allows multiple transactions to be executed at once, which is a major advantage for applications like gaming, DeFi, or high-frequency trading.

What makes Eclipse unique is that it decouples Solana’s execution layer from its own monolithic infrastructure. In other words, developers can build using Solana’s smart contract model, but deploy those apps in a modular environment where execution, settlement, and data availability are handled by specialized layers. Settlement happens on Ethereum, ensuring strong consensus and immutability, while execution stays lightning-fast thanks to the SVM.

To handle DA, Eclipse integrates with Celestia, a dedicated DA layer. Celestia stores and verifies transaction data off-chain using techniques like data sampling and erasure coding. This avoids Ethereum’s expensive on-chain storage while maintaining auditability and accessibility.

As an Ethereum layer-2 rollup, Eclipse launched its mainnet in late 2024, hosting DeFi and gaming dApps with gas-efficient transactions powered by the Sealevel VM’s parallel processing. Beyond Celestia, Eclipse is exploring DA integrations with Avail and NEAR DA in testnets, enhancing its flexibility across modular ecosystems.

The result is a composable, high-throughput layer-2 that leverages best-in-class components for each function: Solana’s VM for speed, Ethereum for security, and Celestia for scalable data availability. Eclipse is a clear example of how modular blockchains let builders assemble the perfect stack for their use case.

Avail: Data Availability as a Modular Service

Avail is a modular blockchain solution focused on providing data availability (DA) services to various execution environments. By decoupling data availability from execution and consensus, Avail enables other blockchains to offload their DA responsibilities, enhancing scalability and flexibility. 

Utilizing techniques like erasure coding and KZG polynomial commitments, Avail ensures that transaction data is both available and verifiable without relying on trust assumptions. This approach allows light clients to confirm data availability efficiently, promoting decentralization.

Originally incubated within Polygon Labs, Avail has since become an independent project. It has garnered support from notable investors, including a $27 million funding round led by Peter Thiel’s Founders Fund and Dragonfly Capital.

Avail’s mainnet, launched in early 2025, supports rollups like Madara (Starknet-based) and integrates with Layer 2s such as Arbitrum, Optimism, Polygon, StarkWare, and zkSync for DA. The Avail DA Light Client enables light clients to verify data availability efficiently, promoting decentralization. Additionally, Avail’s Validium support allows rollups to store data off-chain with on-chain verification, balancing cost and security.

Avail’s DA layer is designed to be protocol-agnostic, making it compatible with various blockchain ecosystems. It has been integrated with multiple layer-2 solutions, such as Arbitrum, Optimism, Polygon, StarkWare, and zkSync, to enhance their data availability capabilities.

By focusing solely on data availability, Avail allows other blockchain components to specialize in their respective functions, embodying the modular architecture’s principles and contributing to a more scalable and efficient blockchain ecosystem.

How They Fit Together: Composability Across Modular Layers

Modular blockchain architecture enables different layers—execution, settlement, and data availability—to specialize and interoperate, enhancing scalability and flexibility.

• Movement Labs: Focuses on execution by leveraging the Move programming language, providing a secure and efficient environment for smart contracts.
• Eclipse: Combines Solana’s Sealevel Virtual Machine (SVM) for high-throughput execution with Ethereum’s settlement layer, ensuring robust security.
• Avail: Offers a dedicated data availability layer, ensuring that transaction data is accessible and verifiable across various blockchain networks.

For example, a gaming dApp could use Movement for secure Move-based execution, Eclipse for high-throughput rollup processing, and Avail for scalable DA, creating a tailored blockchain stack. Standards like Celestia’s Rollup SDK and Avail’s DA interface ensure seamless interoperability between these layers, simplifying integration for developers.

Together, these projects exemplify the composability of modular blockchains, where specialized layers can be integrated to build customized and efficient blockchain solutions.

Modular blockchains offer enhanced scalability and adaptability by separating core functions like execution, consensus, and data availability. However, this separation introduces certain challenges: 

• Increased complexity: Coordinating multiple specialized layers can lead to intricate system designs, making development and maintenance more demanding.
• Security dependencies: Relying on distinct layers means that the overall security is contingent on each component’s robustness. A vulnerability in one layer could compromise the entire system.
• Ecosystem fragmentation: With various modular solutions emerging, there’s a risk of creating siloed ecosystems, hindering interoperability and user experience.
• Latency: Latency can also arise from coordinating execution, settlement, and DA across layers, potentially slowing transaction finality compared to monolithic chains. To address fragmentation, projects like Eclipse and Avail are exploring cross-rollup standards and shared sequencers to enhance interoperability and streamline user experiences.

Despite these challenges, the modular approach allows for tailored solutions, enabling developers to optimize each layer for specific use cases. Balancing these trade-offs is crucial for the sustainable evolution of blockchain architectures.

The Next Stack War — Modular vs. Monolithic Chains

Blockchain infrastructure is entering a new era of competition—this time not over tokens, but architectural stacks. On one side, monolithic chains like Solana and NEAR continue to prioritize unified design and simplicity. On the other hand, modular systems are gaining traction by offering flexibility, specialization, and composability.

Projects like Celestia, Avail, Eclipse, and Movement represent a shift toward a modular “Lego-style” internet of blockchains. Each component—execution, settlement, and data availability—can be optimized separately and plugged in where needed.

That said, monolithic chains still offer performance benefits and lower integration overhead, especially for fast-launch dApps or smaller developer teams. Solana has introduced modular features like Rollup SDKs, blurring the line between monolithic and modular designs. Move-based monolithic chains like Aptos and Sui also compete, leveraging simplicity and Move’s security. The battle hinges on developer experience—monolithic chains offer easier onboarding, while modular systems provide flexibility for complex dApps. Economically, modular chains reduce costs via off-chain DA, but monolithic chains prioritize low-latency user experiences.

The battle isn’t just technical—it’s also strategic. Modular chains may appeal to builders looking for scalability and cross-chain functionality, while monoliths still dominate in simplicity and speed.