Ethereum Founder Vitalik Says Five Banks on One Chain Is Not a Blockchain Solution

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Vitalik Buterin has delivered a verdict on consortium blockchains, calling them a failure of their original vision. Speaking during an Arbitrum Day session, Buterin argued that these private, enterprise-led chains combine the worst aspects of both centralized and decentralized systems.

Instead of offering true openness or strong privacy, they often evolve into “cartel-like” structures, closed networks with limited transparency and weak trust guarantees.

No Real Openness, Weak Privacy

Consortium blockchains were initially pitched as a middle ground for enterprises hesitant to adopt public chains like Ethereum. However, Buterin explained that they fail to deliver meaningful advantages.

They lack decentralization, since control is restricted to a few entities, and they also fail on privacy, as internal participants can still access sensitive data. 

This structural flaw, according to Buterin, makes them hard to justify at scale and fundamentally broken by design.

A Better Path: Upgrade, Don’t Replace

Rather than pushing companies to rebuild systems from scratch, Buterin proposed a more practical solution, enhancing existing centralized servers with cryptographic tools.

This includes anchoring Merkle roots and validity proofs directly on-chain. The idea is to keep the current infrastructure intact, but add a “verification layer” that ensures transparency and security.

This “sidecar” model allows enterprises to gain blockchain-like guarantees without the cost and complexity of full decentralization.

Layer 2 Vision Takes Center Stage

Buterin also outlined the evolving role of Layer 2 (L2) solutions. He described them as systems that operate off-chain while inheriting security from Ethereum’s base layer.

He identified four key L2 categories: EVM-compatible chains, server-style systems with on-chain proofs, experimental environments, and app-specific chains. Each serves different use cases, from enterprise applications to innovation hubs.

The real goal, according to Buterin, is interoperability. A mix of L2 systems working together can form a “heterogeneous sharded ecosystem,” capable of scaling while serving diverse needs.