During a two-month period, Chan Cold contributed to the babylonlabs-io/babylon, vigilante, and btc-staker repositories, focusing on blockchain backend development and operational reliability. Chan upgraded core dependencies to Cosmos SDK v0.53.2 and IBC v10, aligning workflows for stability and cross-chain compatibility. He implemented Bitcoin pubkey validation for stake expansion, enhancing transaction integrity, and refactored the selective slashing message handler to simplify validation logic. Using Go, YAML, and GitHub Actions, Chan improved configuration management for the BTC staking tracker and resolved unstake handling for expired outputs. His work demonstrated depth in dependency management, security, and end-to-end test coverage.