Last updated: October 2026
Cyfrin
est. 2022Cyfrin is a blockchain security firm known for deep protocol-level audits across DEX, Lending, Bridge. This profile aggregates its audit record, 980 findings and notable clients — so you can evaluate fit before requesting a competitive quote through Procur3.
About Cyfrin
Founded in 2022, Cyfrin is a blockchain security firm specialising in smart contract audits and protocol-level security reviews. The team works primarily in Solidity, Rust, Vyper and Huff, covering engagements across Ethereum, Arbitrum, Optimism and related ecosystems. Core areas of expertise include DEX, Lending, Bridge, CDP.
With 85 audits on record, Cyfrin has worked with notable protocols including Beanstalk, Sparkn, Thunder Loan, TSwap. The firm's review history provides a transparent track record that teams can evaluate before engaging.
Cyfrin is tracked on Procur3's auditor directory. Teams can compare their profile, stats and track record against other firms before requesting a quote.
Findings by severity
| Critical, high & medium | 445 | 45.4% |
| Low, informational & other | 485 | 54.6% |
Across 85 audits, Cyfrin has logged 980 findings, of which 445 were rated critical, high or medium — roughly 45% of the total.
Figures are updated periodically and may not include every engagement. Severity labels follow each report's own classification.
Notable clients
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