# Phylax and Titan Bring Circuit Breakers to Ethereum

*Author: David Christopher*
*Published: Nov 10, 2026*
*Source: https://www.bankless.com/read/news/phylax-and-titan-bring-circuit-breakers-to-ethereum*

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Security startup Phylax [launched](https://x.com/phylaxsystems/status/2120169760776450086) a block-level checker with Titan Builder: if an attacker tried to drain an app like Lighter with a withdrawal its rules don't allow, Titan would [leave just that transaction out](https://x.com/titanbuilderxyz/status/2120173609138176161) of the block it's building. 

## What's the Scoop?

- **The Rules:** Apps write their own limits, like Phylax's [example](https://phylax.systems/blog/phylax-and-titan-bring-circuit-breakers-to-ethereum/) of a vault capping any single withdrawal at 50% of its assets. So attackers can't just route around Titan, protected functions can be set to fail in blocks no participating builder has checked. 

- **The Reach:** Over the past day, Titan built ~53% of blocks that validators accepted from outside builders instead of assembling themselves, per tracker [relayscan](https://www.relayscan.io/). Founder Odysseas Lamtzidis [named](https://x.com/odysseas_eth/status/2120172242998866023) Lighter and Derive as first customers, with "almost 1 billion under protection." 

- **The Track Record:** Ethereum L2 Linea has offered Phylax as an opt-in [since January](https://www.theblock.co/news/regulation/2026-01-28-consensys-backed-linea-integrates-phylaxs-credible-layer-to-proactive-prevent-smart-contract-exploits-386915). Enrollee Denaria still [lost](https://paragraph.com/@denariafinance/post-mortem-denaria-incident-05-04-2026) ~$166K on April 5 to an accounting bug: its only rule blocked bad debt, which the attack didn't create, so the check never fired. 

- **The Limits:** Overall, it’s a tripwire, adding to audits but only stopping outcomes an app wrote a rule for. Further, Titan only runs the checks so the apps must write or change their rules over time. There's no cryptographic proof yet that the checks ran, so users take the builder's word, per Phylax's [docs](https://docs.phylax.systems/credible/credible-layer-overview).
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