The Anatomy of a $53M Hack: Radiant Capital Post-Mortem and the Operational Security Playbook 18 minutes from first transaction to complete drain — dissecting every failure point and building the …

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A detailed post-mortem of the $53M Radiant Capital hack, which drained funds across Ethereum, BNB Chain, and Arbitrum in just 18 minutes. The attack succeeded not through smart contract vulnerabilities but through compromised developer devices that met a dangerously low 3-of-11 multisig threshold. Four critical failures are identified: insufficient multisig threshold (27%), no timelocks on critical operations, lack of device compromise detection, and absent real-time monitoring. The article provides a five-layer prevention playbook covering multisig configuration, timelock protection, device security, monitoring, and circuit breakers — with Solidity code examples for each — and notes the entire security infrastructure would have cost under 0.3% of the stolen funds.