A modular blockchain abandons the monolithic architecture where a single network attempts to handle execution, settlement, consensus, and data availability simultaneously. Monolithic chains like Bitcoin and early Ethereum inevitably hit severe scaling bottlenecks because every node must process every transaction and store every byte of data. The modular approach breaks this stack apart into specialized layers. A rollup like Arbitrum handles purely execution, processing thousands of transactions per second off-chain. It relies on Ethereum strictly for settlement and consensus, ensuring absolute security. Meanwhile, a specialized network like Celestia or EigenDA handles data availability, providing cheap, abundant blockspace strictly for storing transaction histories. This separation of concerns mirrors the evolution of traditional computing from monolithic mainframes to microservices. It allows developers to deploy new rollups immediately, mixing and matching components: using Ethereum for security but a custom VM for execution. The modular approach finally provides a credible path to internet-scale blockchain capacity without compromising the fundamental requirement that individual users must be able to verify the system's integrity. It acknowledges that trying to do everything on one layer creates an unscalable bottleneck, and specialization is the only way forward.
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