Cybersecurity Consulting Firm – Cyber Castellum
Over $3.8 billion was stolen from blockchain protocols in 2022 alone — primarily through smart contract vulnerabilities and key management failures that professional security audits would have caught.
Blockchain Security services provide technical security assessments and advisory for organizations building on or integrating with blockchain infrastructure. From smart contract audits to protocol security reviews and DeFi application testing, we bring rigorous security engineering to the unique threat landscape of distributed ledger technology.
White-hat security research for the Cardano ecosystem, embedded directly into the open-source development of a next-generation blockchain node implementation.
Blockchain infrastructure lives or dies on the security of its node software and consensus protocol. As the Cardano ecosystem grew a second, independent node implementation, the community needed rigorous, independent security research at the deepest layer of the stack — the logic that keeps thousands of independent nodes in agreement and the network resilient against attack.
Cyber Castellum was engaged as a security research partner embedded directly in the open-source development process.
Mapping attack surfaces and trust boundaries across the node and network layers, and maintaining a prioritized risk register as the protocol evolved.
Designing and building a purpose-built fuzzing framework to systematically generate and replay adversarial scenarios — now published as an open-source tool for the community.
Identifying cases where independent node implementations could disagree on the same input, and stress-testing the network's resilience to resource exhaustion and adverse conditions.
Validating third-party audit findings and packaging methodology and tooling into a structured handover for the team to build on.
Work was delivered on a public monthly milestone cadence, keeping the research transparent and auditable to the broader Cardano community.
Cyber Castellum's research strengthened the security posture of a next-generation blockchain node implementation before it reaches production-critical adoption, surfacing edge cases that could otherwise have gone undetected until they caused real network instability.
By embedding security research directly into an open-source protocol's development lifecycle, Cyber Castellum helped build resilience in from the ground up rather than bolting it on after the fact — leaving behind reusable tooling the community can continue to build on.
Built during this engagement and released for the Cardano developer community.
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