Plain English
A modular blockchain decouples the four functions of a chain — execution (running contracts), settlement (final accounting), consensus (ordering), and data availability (publishing transaction data) — into specialized layers. The opposite is a “monolithic” chain like Solana that does all four together.
How it actually works
Ethereum is becoming modular: execution moves to L2 rollups, data availability moves to dedicated DA layers like Celestia or EigenDA, consensus and settlement stay on L1. Each layer can scale independently and be replaced. The trade-off: more complexity, more bridges, more attack surface. Monolithic chains are simpler but bounded by single-chain hardware limits.
What it means for you
The modular thesis is the dominant Ethereum-camp roadmap. For HNW positioning, this matters because the value capture across the stack is being debated in real time: does it accrue to L1 (ETH), L2s (ARB, OP), DA layers (TIA), or the apps on top? Owning across the stack — not just one layer — is the prudent answer until the equilibrium becomes clear.
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Educational content only. Not investment, tax, or legal advice.