Draft:BlockSec
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| Company type | Private |
|---|---|
| Industry | Blockchain security |
| Founded | 2021 |
| Founders | Yajin (Andy) Zhou Lei Wu |
| Products | Phalcon; MetaSleuth; MetaSuites |
| Services | Smart contract security audits; On-chain threat monitoring; Incident response and analysis; Crypto AML |
| Website | blocksec |
BlockSec is a blockchain security company providing smart contract security audits, on-chain monitoring and crypto AML services. In a 2022 report, SecurityWeek described BlockSec as offering security audits for projects in the Solidity and Rust ecosystems and monitoring solutions for flash-loan and transaction activity, including attempts at money laundering.[1]
History
[edit]SecurityWeek reported that BlockSec was founded in 2021.[1] In July 2022, SecurityWeek reported that BlockSec raised $8 million in a seed funding round co-led by Vitalbridge Capital and Matrix Partners, with participation from CoinSummer, Mirana Ventures and YM Capital.[1]
Products and services
[edit]According to SecurityWeek, BlockSec provides smart contract security audits and monitoring solutions intended to identify weaknesses in blockchain applications and prevent attacks, including monitoring for suspicious flash-loan and transaction activity and detecting money-laundering attempts.[1]
In reporting on DeFi incidents, Cointelegraph has cited “Blocksec Phalcon” as a blockchain security platform used for publishing alerts and incident reporting.[2]
Alchemy’s dApp directory has listed MetaSleuth (by BlockSec) as an anti-money-laundering (AML) / tracing tool for tracking fund flows across blockchains.[3]
Incident analysis and response
[edit]BlockSec has been cited by cryptocurrency and technology media outlets for incident analysis and responses related to DeFi exploits.
Platypus Finance counter-exploit (2023)
[edit]In February 2023, following an exploit of the DeFi protocol Platypus, The Block reported that BlockSec identified a loophole in the attacker’s contract and helped return approximately $2.4 million (USDC) to the protocol via an upgrade proxy implementation.[4] Blockworks also described Platypus recovering funds “with the help of BlockSec” via a counter-exploit approach.[5]
Balancer exploit coverage (2023)
[edit]During a 2023 exploit affecting Balancer pools, Decrypt reported that analysts at BlockSec checked the attacked pools and confirmed the exploited pools were among those previously identified by Balancer as exposed to a disclosed vulnerability.[6]
Onyx exploit analysis (2023)
[edit]In November 2023, The Block reported that BlockSec analysts attributed a $2.1 million exploit of the DeFi protocol Onyx to a “precision loss” vulnerability (an integer rounding issue), aided by a flash loan.[7]
Infini exploit confirmation (2025)
[edit]In February 2025, The Block reported that security analysts at Cyvers and BlockSec confirmed that Infini, described as a Hong Kong-based stablecoin neobank and payments platform, was the impacted entity in an approximately $49 million USDC theft.[8]
Research and conferences
[edit]BlockSec has been associated with both academic and industry venues in blockchain security and protocol engineering.
USENIX ATC 2024 published a paper on Ethereum archive nodes listing authors affiliated with BlockSec alongside Zhejiang University authors.[9]
EthCC’s archived program lists “Andy Zhou” as the speaker for a July 11, 2024 talk titled A Lightweight Architecture for Ethereum Archive Nodes.[10]
Protocol Berg (2023), organized by the ETHBerlin team, listed “Yajin (Andy) Zhou (BlockSec & Zhejiang University)” among its speakers.[11]
Black Hat USA 2024’s briefing schedule listed a 60-minute keynote titled Use Your Spell Against You: Threat Prevention of Smart Contract Exploit By Reusing Opcode Trace with speaker Yajin Zhou.[12]
Founders
[edit]A 2024 research seminar announcement from The Hong Kong Polytechnic University described Yajin (Andy) Zhou as a co-founder of BlockSec and a professor at Zhejiang University.[13]
References
[edit]- ^ a b c d Arghire, Ionut (July 13, 2022). "Blockchain Security Startup BlockSec Raises $8 Million". SecurityWeek. Retrieved December 23, 2025.
- ^ "Bitcoin scammers impersonate police, Sunray Finance $2.7M drain: Crypto-Sec". Cointelegraph. Retrieved December 23, 2025.
- ^ "MetaSleuth". Alchemy. Retrieved December 23, 2025.
- ^ "Platypus DeFi salvages $2.4 million in hacked funds with BlockSec's help". The Block. Retrieved December 23, 2025.
- ^ "Counterexploit Salvages Stolen Funds From Platypus Hacker". Blockworks. Retrieved December 23, 2025.
- ^ Rustgi, Nivesh (August 28, 2023). "Balancer Suffers Nearly $1M Exploit as Team Urges Users to Withdraw Funds". Decrypt. Retrieved December 23, 2025.
- ^ "Attacker drains $2.1 million from Onyx in latest DeFi exploit". The Block. Retrieved December 23, 2025.
- ^ "Stablecoin neobank Infini exploited for $49 million: security analysts". The Block. Retrieved December 23, 2025.
- ^ "SlimArchive: A Lightweight Architecture for Ethereum Archive Nodes". USENIX. Retrieved December 23, 2025.
- ^ "A Lightweight Architecture for Ethereum Archive Nodes". EthCC Archives. July 11, 2024. Retrieved December 23, 2025.
- ^ "Protocol Berg (2023)". Protocol Berg. September 15, 2023. Retrieved December 23, 2025.
- ^ "Black Hat USA 2024". Black Hat. Retrieved December 23, 2025.
- ^ "Research Seminar: Prof Yajin Zhou" (PDF). The Hong Kong Polytechnic University. September 4, 2024. Retrieved December 23, 2025.
External links
[edit]Category:Computer security companies Category:Blockchain companies Category:Companies founded in 2021
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