Phylax's system lets DeFi applications define their own security policies that Titan Builder enforces during block construction, excluding violating transactions before settlement. The company says roughly half of Ethereum blocks are covered, with average policy checks completing in microseconds. Stated use cases include capping asset outflows during key compromise, defending against oracle manipulation, donation attacks and MEV sandwiching, and blocking unauthorized upgrades. Phylax notes it has been live on Linea for nearly a year and that other builders can integrate the enforcement engine. Neither Phylax nor builders can impose rules on apps, per the design.

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