Crypto glossary

Monolithic Blockchain

A monolithic blockchain is a design in which one chain handles all of its core jobs itself: executing transactions, reaching consensus, settling results and keeping transaction data available.

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The four jobs of a blockchain

Execution means running transactions and smart contracts to compute the new state. Consensus means the network agreeing on the order of transactions. Settlement means finalizing results and resolving disputes. Data availability means making sure the transaction data is published so anyone can check it.

In a monolithic chain, the same set of nodes performs all four. Bitcoin and Ethereum before rollups were monolithic in this sense, and Solana is often cited as a modern example designed to scale this way.

Monolithic versus modular

Modular designs split these jobs across layers. A rollup, for instance, executes transactions itself but relies on Ethereum for settlement and data availability, and specialised networks offer data availability alone. The aim is to let each layer optimise one job.

Monolithic chains scale by making the single chain faster, using more powerful hardware, parallel execution and optimised networking. Their main advantage is simplicity: all applications share one state, so they can interact directly in a single transaction, a property called composability.

An example

Say you swap tokens and then deposit the result into a lending protocol. On a monolithic chain, both steps can happen atomically in one transaction, at one fee, with one finality. Across two separate rollups, the same flow may require a bridge, two fees and a waiting period, and introduces extra risks.

Trade-offs and risks

Pushing everything through one chain raises the hardware and bandwidth needed to run a validator, which can limit how many people can independently verify the network and so affect decentralization. A problem in one component can also halt the whole system; Solana, for example, experienced several network outages in 2021 and 2022. Modular systems have their own risks, such as fragmented liquidity and bridges between layers. Neither approach is simply better; they balance the blockchain trilemma of security, scalability and decentralization differently.

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Frequently asked questions

Is Ethereum monolithic or modular?

Ethereum's main chain still performs all four jobs, but its scaling roadmap is modular, relying on rollups for most execution while Ethereum provides settlement and data availability.

Are monolithic blockchains faster?

Some are designed for very high throughput on a single chain, but speed depends on the specific design and hardware, not only on being monolithic.

Why does composability matter?

It lets applications build on each other in one transaction, which simplifies DeFi flows and avoids bridge risk.

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