3-Point Summary

• The L2 market has shifted from a single scalability race to a purpose‑driven multi‑axis structure.
• Aztec Network leads L1 fee payments due to its privacy‑centric ZK architecture, not transaction volume.
• Robinhood Chain’s retail‑driven design pushes real user activity on‑chain, creating explosive transaction growth.

The L2 market has entered a new phase where privacy, retail, and scalability form three distinct axes shaping the future of Ethereum.

※ This article is published in its current version first and will be updated to the final Daily Crypto Time (DCT) format in two days.

The Real Shift in the L2 Market: The Triangle of Privacy ZK, Retail L2, and Scalability Rollups

📚 Previous articles

• The L2 Paradigm Shift: From Developer–DeFi Dominance to Retail–Platform Leadership
• Is L2 Really Safe? The Critical Security Differences Between L1 and L2
• Ethereum’s Next Decade: The L2 Revolution Transforming Finance, AI, Gaming, and Social Networks
• The Future of Blockchain Was Already in the Internet: L1 Public Goods and the L2 Co‑Funding Model
• The Truth Behind the L2 Scaling Debate: Why Rollup‑First Is the Best Path Today

By 2026, the L2 market has moved beyond a simple race for scalability and entered a phase where the structural differences between networks are defined by the purposes they are built for. Aztec Network and Robinhood Chain are evolving in completely different directions, showing that the L2 ecosystem is no longer a single technical track but a multi‑layered, purpose‑driven structure. Aztec Network, with its privacy‑focused ZK rollup architecture, has become the network that pays the most L1 fees on Ethereum—a result driven not just by transaction volume but by its technical design. Robinhood Chain, on the other hand, is a retail‑centric platform L2 where user activity is automatically pushed on‑chain, creating a new market axis through an explosion in actual transaction count. The contrast between these two networks reveals that the old framing of L2 technology as simply “ZK vs Optimistic” is no longer sufficient. L2 technology is now clearly split into three axes—privacy, retail, and scalability—and each axis is evolving toward different purposes and user bases.

1) Why Aztec Network ranks #1 in L1 fee payments

Aztec Network is built on a unique privacy‑centric ZK rollup architecture. To hide transaction details, it relies on complex cryptographic circuits and large ZK proofs, which naturally increase the amount of data posted to L1 and the fees paid. In other words, Aztec’s position as the top payer of L1 fees is not just a function of transaction volume, but a direct consequence of a technical design that raises costs in order to guarantee privacy. To preserve privacy, the entire transaction data must be encrypted, and the proof required to verify it must be published on L1. This process demands far more computation and data posting than a typical ZK rollup, structurally pushing L1 fees higher.

• Full encryption of transaction data
• Complex cryptographic circuits
• Generation of large ZK proofs
• Proof data posted to L1

2) Why Robinhood Chain’s actual transaction count is so high

Robinhood Chain is a retail‑centric platform L2 where trades made by Robinhood app users are automatically routed on‑chain in the backend. Users often do not even realize they are interacting with on‑chain infrastructure, while tokenized stocks and ETFs are seamlessly processed on the L2. This architecture generates a massive volume of small, high‑frequency trades—exactly the kind of activity that leads to an extremely high actual transaction count. In particular, Robinhood Chain creates an on‑chain wallet automatically when users log into the app and connects their trade requests to DEX infrastructure behind the scenes. As a result, retail user behavior is naturally pulled on‑chain, producing a scale of real transaction volume that traditional L2s have rarely seen.

• Automatic wallet creation at app login
• Tokenized stock and ETF trades automatically pushed on‑chain
• Large volume of small, high‑frequency transactions
• User experience remains identical to the familiar Robinhood app

3) The three axes of L2 technology

L2 technology can now be clearly understood along three axes: privacy‑centric ZK rollups, general‑purpose ZK rollups, and optimistic rollups. Each axis targets different purposes and user segments, and this distinction is essential for understanding the structural evolution of the L2 ecosystem. Robinhood Chain, in particular, represents a new category within optimistic‑rollup‑based L2s: a retail‑driven platform L2 that defines itself more by user base and purpose than by raw technical classification. This means Robinhood Chain is not just another optimistic rollup, but a network where the identity of the users and the platform’s role shape the technology itself. Taken together, these developments show that L2 technology must be understood not only through technical labels, but also through the lens of who it serves and why it exists.

• Privacy‑centric ZK rollups: Aztec
• General‑purpose ZK rollups: zkSync, Starknet, Scroll
• Retail‑driven optimistic rollup L2: Robinhood Chain

Conclusion

Aztec Network and Robinhood Chain demonstrate that the L2 market has moved beyond a simple scalability contest and into a phase where each network’s purpose drives fundamentally different structural outcomes. Privacy‑centric ZK rollups accept higher L1 costs in order to guarantee strong privacy, while retail‑driven L2s naturally pull user behavior on‑chain and generate explosive growth in actual transaction volume. L2 technology is now divided into three axes—privacy, retail, and scalability—and Robinhood Chain stands out as a clear example of the new retail‑centric L2 category. Understanding these structural shifts is essential for anyone trying to analyze where the L2 market is heading over the coming years.

Younchan Jung
Researcher exploring structural shifts in AI, blockchain, and the on‑chain economy.

If you would like to read this article in Korean, please click the button below.

Read This Article in Korean →