Audit firm tier

Evidence summary #

Zellic (Tier-1 per taxonomy firm-tier registry) has audited Concrete (Jun 2025 EVM audit, found in Zellic publications index). Cantina qualifies as a top-tier competitive platform. Halborn is Tier-2. At least one Tier-1 firm (Zellic) has covered deployed code. Green.

Sources #

Methodology #

Classify each auditing firm into: Tier-1 (Trail of Bits / OpenZeppelin / ConsenSys Diligence / Certora / Sigma Prime / Spearbit / Zellic) / Tier-2 (established, named firm with public track record) / boutique / unknown.

See the full factor methodology and distribution across all protocols →