Kubi Mensah: Understanding blockchain is key for trading success, the evolution of block builders raises performance standards, and the critical role of public and private mempools in transaction management | Epicenter

Gattaca's Titan Builder reshapes Ethereum block building with advanced transaction handling and competitive edge strategies.

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Add us on Google by Editorial Team May. 1, 2026

Key Takeaways

• Understanding blockchain technology is essential for gaining a competitive edge in trading.
• The crypto market’s maturity has increased technical and operational standards for block building.
• Block building is highly competitive, raising expectations for performance and reliability.
• The role of block builders has evolved to include broader responsibilities beyond constructing blocks.
• Validators connect to the out-of-protocol block construction market via relays like nv boost.
• Block building involves complex processes, with only half of transactions coming from the public mempool.
• The public mempool is a network of nodes sharing local views of transactions.
• Private mempools optimize transaction flow through auction mechanisms.
• Transaction bundling and optimization enhance user execution in blockchain transactions.
• CeFi and DeFi arbitrage traders generate significant transaction volume.
• The mental model of block building has shifted to a more integrated approach.
• Transaction visibility in blockchain is influenced by the structure of the public mempool.
• Private mempools play a critical role in transaction management and privacy.
• Advanced transaction handling techniques improve outcomes for blockchain users.
• Understanding CeFi and DeFi arbitrage trading is crucial for grasping transaction dynamics.

Guest intro

Kubi Mensah is CEO and Co-Founder at Gattaca, the company behind Titan Builder, a leading neutral block builder on Ethereum. Gattaca evolved from a venture-backed crypto trading and technology firm in London to one of the three dominant builders controlling the vast majority of Ethereum blocks. A Y Combinator alumnus, Kubi has driven Gattaca’s expansion across the Ethereum MEV supply chain, including relays and order flow auctions.

The evolution of block building

• The mental model of thinking about a block builder has changed quite a bit

  — Kubi Mensah

• Block builders now have a broader scope of responsibilities.

• We operate nv boost relay, which is how validators connect to the out-of-protocol block construction market

  — Kubi Mensah

• The role of relays is crucial in connecting validators to block construction markets.
• The competitive nature of block building has increased performance expectations.

• Block building specifically is also very competitive in its nature

  — Kubi Mensah

• The crypto industry’s maturity has raised technical standards for block building.

• The bar has just gone a lot higher

  — Kubi Mensah

Understanding blockchain technology for trading

• Knowledge of blockchain components like the EVM is crucial for traders.

• A lot of the edge that you actually get as a trading firm comes from understanding how things work under the hood

  — Kubi Mensah

• Technical knowledge can lead to strategic advantages in trading.
• Understanding consensus mechanisms is part of gaining a competitive edge.
• The underlying mechanisms of blockchain technology are essential for traders.

• We had to really go deep into the evm like the p two p layer how nodes work how consensus work

  — Kubi Mensah

• A deep understanding of blockchain technology is necessary for success.
• Traders benefit from understanding how blockchain networks operate.

The complexity of transaction processing

• Block building involves complex processes beyond just picking transactions from the public mempool.

• Only about half of the transactions that later get included are actually go through the public mempool

  — Kubi Mensah

• The process of block building and proposing is divided among different parties.
• Understanding transaction inclusion is crucial for grasping block building dynamics.
• The complexity of transaction processing is often misunderstood.
• Public order flow plays a significant role in transaction inclusion.

• There’s a lot of nuance missing in kind of why the process of block building and proposing has kind of been divvied up

  — Kubi Mensah

• The mechanics of transaction processing are intricate and multifaceted.

The role of public and private mempools

• The public mempool is a network of nodes sharing local transaction views.

• It’s a network of nodes and each node has a local view of transactions

  — Kubi Mensah

• Private mempools aggregate transactions privately for optimization.

• There’s this other less transparent part of the ecosystem which is a private mempool

  — Kubi Mensah

• Private mempools can auction transactions to traders.
• The structure of the public mempool affects transaction visibility.
• Private mempools play a critical role in transaction management.
• Understanding mempool operations is crucial for grasping blockchain dynamics.

Transaction optimization techniques

• Transaction bundling can enhance user execution in blockchain transactions.

• There are all these techniques and optimizations that then completely gets obstructed away from users

  — Kubi Mensah

• Advanced transaction handling improves outcomes for users.
• Optimization techniques are often hidden from users but beneficial.
• The complexity of transaction processes requires sophisticated handling.
• Users benefit from better execution through optimized transaction techniques.
• Transaction optimization is crucial for efficient blockchain operations.
• Understanding these techniques is essential for grasping blockchain transaction dynamics.

The impact of CeFi and DeFi arbitrage traders

• CeFi and DeFi arbitrage traders generate significant transaction volume.

• Big example would be the cefi defi arbitrage traders

  — Kubi Mensah

• These traders have specific execution needs that impact transaction dynamics.
• Understanding their strategies is crucial for grasping the blockchain ecosystem.
• Arbitrage trading involves looking at off-chain and on-chain price discrepancies.

• They basically look at prices off chain and then what’s the local prices

  — Kubi Mensah

• Their activities highlight the importance of understanding transaction dynamics.
• The role of arbitrage traders is significant in the blockchain ecosystem.

Disclosure: This article was edited by Editorial Team. For more information on how we create and review content, see our Editorial Policy.