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Modular vs Monolithic Blockchains: A Practical Guide

A clear, data-driven guide to modular vs monolithic blockchains.

Four functions

Blockchains perform execution, settlement, consensus and data availability. Monolithic chains such as Solana do all four on one layer; modular stacks split them across layers.

Ethereum's rollup-centric roadmap

Since Vitalik Buterin's October 2020 roadmap post, Ethereum focuses on settlement and DA for rollups, which handle execution. EIP-4844 added blobs as a DA product in 2024.

Dedicated DA layers

Celestia, EigenDA and Avail provide cheaper DA with different security. Rollups using external DA are often called validiums or optimiums.

Monolithic case

Solana argues that a single shared state avoids fragmentation and bridging, and that hardware improvements raise throughput; Firedancer targets over 1 million TPS in tests.

Trade-offs

Modular designs scale and customize but fragment liquidity and add bridging latency; monolithic designs offer atomic composability but higher node requirements.

By the numbers

For Modular vs Monolithic Blockchains, the reference figures are topic of Modular vs Monolithic Blockchains, level of Intermediate, updated of 2026. The comparison table below lines up layer, modular example, monolithic — Execution: Arbitrum, Base / Solana; Settlement: Ethereum / Solana; DA: Ethereum blobs, Celestia / Solana.

Modeling Modular vs Monolithic Blockchains with the L2 Rollup Blob Fee Comparator

The L2 Rollup Blob Fee Comparator takes three inputs — Tx count, L1 fee ($), L2 fee ($). Savings = txs × (L1 fee − L2 fee). With its default inputs (Tx count = 100; L1 fee ($) = 2.5; L2 fee ($) = 0.02) it returns 248 $; swap in the figures from Modular vs Monolithic Blockchains above to reproduce the scenario yourself.

Modeling Modular vs Monolithic Blockchains with the Cross Chain Bridge Finality Latency Estimator

The Cross Chain Bridge Finality Latency Estimator takes three inputs — Source block time (s), Confirmations, Relay delay (s). Latency = block time × confirmations + relay. With its default inputs (Source block time (s) = 12; Confirmations = 64; Relay delay (s) = 120) it returns 14.8 min; swap in the figures from Modular vs Monolithic Blockchains above to reproduce the scenario yourself.

Data Table

For educational and informational purposes only. Not financial, investment, tax or legal advice. Figures are approximate and historical; crypto assets are volatile and you may lose capital. Do your own research.