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What is Modular Blockchain?

1 min read Updated

A modular blockchain separates core functions — execution, consensus, settlement, and data availability — into specialized layers that can be mixed and matched, rather than handling everything in a single monolithic chain.

WHY IT MATTERS

The modular thesis: instead of one chain doing everything (Ethereum L1), specialize. Execution happens on rollups. Data availability on Celestia or EigenDA. Settlement and consensus on Ethereum. Each layer optimizes for its function.

This is already happening: rollups handle execution, Ethereum provides settlement, and EIP-4844/Celestia handle data availability. The modular stack is becoming the default architecture for new blockchain projects.

Benefits: each layer can innovate independently, applications choose their security/cost tradeoff, and the overall system scales better than monolithic approaches.

FREQUENTLY ASKED QUESTIONS

Modular vs monolithic?
Monolithic (Solana): one chain does everything — simpler but harder to scale each function independently. Modular (Ethereum + rollups + DA): specialized layers — more complex but more flexible and scalable.
What are the modular layers?
Execution (process transactions), settlement (finalize state), consensus (agree on ordering), data availability (ensure data is published). Modular chains can outsource any of these.
Is Ethereum modular?
Increasingly yes. Ethereum L1 is becoming a settlement and DA layer, with execution moving to L2 rollups. This wasn't the original design but has become the dominant roadmap direction.

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