Because bridges connect different chains, they are high-risk targets. We use a focused process to ensure your bridge is secure from every angle.
Check the final bridge contracts, architecture, and design documents. Then, decide the audit scope. Prepare a customized quote based on bridge complexity, chains involved, and risk surface. NDA support is available if needed.
Define Bridge Scope and Cost
Check the final bridge contracts, architecture, and design documents. Then, decide the audit scope. Prepare a customized quote based on bridge complexity, chains involved, and risk surface. NDA support is available if needed.
Confirm Terms and Timeline
Finalize engagement details, including pricing and audit schedule. Set clear milestones to align bridge audit progress with your launch or upgrade plan.
Execute Audit and Verify Fixes
Perform a full blockchain bridge audit using in-house tools and manual review. Share findings with your team and review remediation updates. Complex bridges may require multiple audit cycles.
Deliver Report and Mitigation Guidance
Provide a signed audit report covering vulnerabilities, risk impact, and fix recommendations. Offer clear guidance to help strengthen bridge security and reduce cross-chain attack risk.
We combine deep cross-chain expertise with proprietary tools to secure the complex flows of money and messages between chains.
“We had a great experience working with BlockSec on the security testing of Mega-EVM, our stateless validator, and the SALT data structure. They're responsive, diligent, and easy to collaborate with, with a fast feedback loop throughout the audit. Their deep expertise across both smart contracts and node-level systems made them a strong partner for complex infrastructure work.”
“On the audit side, the BlockSec team has left a very positive impression on us. Their audits are never a mere formality; instead, they dive deep into contract implementation details and specific business logic, covering edge cases and extreme scenarios that are often overlooked. The entire process was smooth and highly efficient. Their bug localization and remediation advice were clear and actionable, helping us significantly reduce potential security risks before product launch.”
“BlockSec has built a strong reputation for conducting highly technical audits for blockchains and smart contracts. Supporting Solidity (EVM-compatible ecosystems), Rust (NEAR & Solana), and Go (Cosmos), the company primarily relies on thorough manual reviews, enhanced by automated differential fuzzing tools and static analyzers. This approach allows BlockSec to identify deep logic flaws in code and provide actionable recommendations to ensure project security before launch.”
“BlockSec's deep expertise in smart contract security has been invaluable to exSat. Their rigorous audits consistently uncover subtle yet critical vulnerabilities, delivering clear, practical remediations. With their meticulous, code-level scrutiny, we gain unparalleled confidence in our protocol's integrity—making BlockSec our trusted partner for secure, resilient smart contracts.”
We use our own special security tools, such as advanced fuzzers and static analyzers, which no other audit firm has.
We use mathematical proofs (Formal Verification) to guarantee that the most critical parts of your code simply cannot fail.
We have a proven track record of saving projects from massive losses and discovering critical bugs in major protocols before bad guys do.
We don't use a "one-size-fits-all" approach. Instead, we build specific tests just for your unique project to catch edge-case problems.
~$39.5M Lost: Allbridge, Wanchain & More | BlockSec Weekly
During the week of July 20-26, 2026, 8 notable security incidents resulted in approximately $39.5M in total losses across Solana, Ethereum, BNB Chain, Arbitrum, Zilliqa, and Cardano. The highlighted Allbridge Core incident (~$1.65M) exposed a Solana input validation flaw where the same Pool account was accepted in both swap roles, with analysis reconstructed entirely from the deployed program binary. Other analyzed incidents include Wanchain (~$500K, flawed message encoding in a Cardano bridge validator), Zilliqa (~$400K, flawed nonce generation in a Ledger app since 2019), and Lien Finance (~$542K, flawed validation logic in bond exchange).
Top 10 "Awesome" Security Incidents in 2025
To help the community learn from what happened, BlockSec selected ten incidents that stood out most this year. These cases were chosen not only for the scale of loss, but also for the distinct techniques involved, the unexpected twists in execution, and the new or underexplored attack surfaces they revealed.
Newsletter - December 2025
In December 2025, the DeFi sector encountered three significant security incidents, resulting in total losses of approximately $19.7 million. Yearn Finance faced nearly $10 million in losses due to vulnerabilities in its yETH pool and legacy contracts. Trust Wallet suffered a malicious backdoor attack on its Chrome extension, leading to losses of about $7 million. Ribbon Finance experienced a loss of $2.7 million due to improper access controls.
