Public write-ups on the bugs, patterns, and protocols we audit. Engineer-to-engineer, no fluff.
How much did a position earn while in range, over months of crossings, with no loops and one checkpoint? V3 answers in two subtractions by storing the wrong side on purpose.
Read
Every division in SqrtPriceMath decides where the lost fraction goes. V3 answers the same way every time: the pool wins. Get one flag backwards and you have built a faucet.
Read
Open the V3 pool contract and look for the price. It is not there. What is stored is the square root, in Q64.96, and that single choice is what makes the swap loop affordable.
Read
A builder focused Hyperliquid security checklist covering HyperBFT assumptions, HyperCore integrations, HyperEVM deployment risks, and pre audit launch gates before mainnet.
Read
A builder focused Hyperliquid security checklist covering HyperBFT, HyperCore, HyperEVM, order flow, liquidation, oracle, bridge, and pre audit risks before launch.
Read
EIP-7702 lets EOAs become smart contracts with one signature. Here are the 4 attack surfaces — phishing, delegate bugs, replay, ERC-4337 — auditors now check.
ReadHow much did a position earn while in range, over months of crossings, with no loops and one checkpoint? V3 answers in two subtractions by storing the wrong side on purpose.
ReadEvery division in SqrtPriceMath decides where the lost fraction goes. V3 answers the same way every time: the pool wins. Get one flag backwards and you have built a faucet.
ReadOpen the V3 pool contract and look for the price. It is not there. What is stored is the square root, in Q64.96, and that single choice is what makes the swap loop affordable.
Read
A full smart contract audit costs $15k-$100k+. Here is an honest comparison of every option an underfunded web3 founder actually has in 2026: free tools, AI review, audit contests, bug bounties, time-boxed audit sessions, and when each one is enough.
Read
A senior auditor walks through what actually happens during a smart contract audit, week by week. Pre-audit prep, manual review, findings, fix verification, and final deliverables.
Read
The 2026 security timeline for Web3 protocols: when to audit at design, dev, pre-launch, and post-launch — plus real lead times, audit costs, and launch buffer rules.
Read
When LLMs can prepare or sign transactions, smart contract risk expands into prompt injection, policy drift, simulation mismatch, and wallet authority abuse.
Read
How to audit AI trading bots and onchain agents before prompt injection, wallet misuse, and market-facing automation turn into fund loss.
Read
Technical analysis of the largest crypto hack ($1.5B). How compromised frontend infrastructure enabled UI injection that turned blind signing into a total drain.
Read
The ERC-4626 inflation attack still drains vaults in 2026. See the deposit-donate math, real hacks (Cream, Sonne, Resupply), and the invariants that catch it.
Read
Most 2026 DeFi losses came from compromised signers, not buggy code. How multisig, timelocks, and MPC contain key compromise — lessons from Drift's $285M hack.
Read
How flash loans amplify oracle, donation, and reentrancy bugs into $200M+ DeFi exploits — Cetus, Penpie, KyberSwap, UwU Lend case studies plus defenses that hold.
Read
Free Discords, CTFs, audit contest platforms, bootcamps, and paid memberships compared. What each one actually gives a web3 developer, aspiring auditor, or protocol founder in 2026, what it costs, and how to choose.
Read
Most Web3 founders are technical and ship great code, then watch the protocol die to non-code problems. Tokenomics, fundraising, governance, regulatory, GTM — this is what kills teams.
Read
The 2026 OWASP Smart Contract Top 10 elevated business logic to #2 and added proxy & upgradeability at #10. Here's what changed and how to audit.
Read
How to learn Web3 from scratch: the right order to actually understand blockchains, wallets, DeFi, and scams, in a free 90-day path.
Read
A free, interactive Zealynx Academy course that teaches you to understand Web3 for real, crypto, DeFi, wallets, DAOs, scams, security, not memorize jargon.
Read
After 30+ audits, we kept seeing failures rooted in missing literacy, not missing code skill. So a security firm built a beginner course. Here's why.
Read
OWASP ASI01 (Agent Goal Hijack) explained: how prompt injection redirects AI agent objectives. Direct, indirect, and tool-mediated patterns with mitigations.
Read
AI agents now autonomously control DeFi treasuries, execute trades, and trigger liquidations. The cross-layer attack surface that contract audits cannot see.
Read
Zealynx Academy uses no videos, no slides, no passive content. Every section is interactive. Here's the pedagogical argument for why that works better for Web3 builders — and the specific design patterns behind it.
Read
Understand why it is critical to secure your AI applications from misuse
Read
CVE-2025-49596 (CVSS 9.4 Critical): unauthenticated RCE in Anthropic's MCP Inspector. How the proxy architecture failed, the patch (v0.14.1), and lessons for MCP dev tools.
Read
Rebuild Compound V2 from scratch — cTokens, Comptroller, InterestRateModel, and liquidation logic. The second-most-forked DeFi protocol, understood end to end.
Read
Why long-lived AI agents fail across time, not just prompts. Practical audit checks for delayed execution, stale approvals, and memory-driven authority drift.
Read
OWASP ASI05 (Unexpected Code Execution) explained: how agent-generated code and tool composition produce RCE in agentic systems. Real CVEs and mitigations.
Read
Most Web3 education is video-heavy. Research shows active construction of knowledge produces meaningful skill faster than passive consumption. Here's why build-first platforms matter.
ReadA senior auditor walks through what actually happens during a smart contract audit, week by week. Pre-audit prep, manual review, findings, fix verification, and final deliverables.
Read
The four Uniswap v4 hook attack patterns that cover every public exploit: reentrancy, flag bypass, donation griefing, accounting drift — with minimal PoCs.
Read
CVE-2025-54136 (MCPoison) and CVE-2025-54135 (CurXecute): tool descriptor injection and workspace-file-write RCE in Cursor IDE's MCP layer. Mechanism, impact, fixes.
Read