During December 2024, Park Hay Yeung developed and delivered slashing event handling for OP stack consumer chains within the babylonlabs-io/vigilante repository. He extended the BTC Slasher program by introducing new subscription channels and processing logic in Go, enabling the detection and response to equivocating finality providers from cross-chain sources. This backend development work focused on enhancing cross-chain security and slashing robustness, aligning with the project’s goal of improving operator confidence in finality governance. The implementation demonstrated a thoughtful approach to event-driven architecture, with maintainable code changes that addressed targeted blockchain evidence processing without introducing unnecessary complexity.