VRF7Smart Contract Security Guides
Reentrancy Attacks in Solidity: How They Work and How to Prevent Them
Learn how reentrancy attacks work in Solidity, from classic single-function exploits to cross-function and read-only variants, with concrete fixes and code examples.
Integer Overflow and Underflow in Smart Contracts
Learn how integer overflow and underflow vulnerabilities work in Solidity, why Solidity 0.8 changed arithmetic, and how unchecked blocks reintroduce risk.
Access Control Vulnerabilities in Smart Contracts
Learn how missing modifiers, unprotected initializers, and flawed role systems create access control vulnerabilities—and how to fix them before deployment.
Why You Should Never Use tx.origin for Authorization
Using tx.origin for authorization exposes your contract to phishing attacks. Learn the difference from msg.sender and the correct pattern to protect your users.
Unchecked External Calls and the Risks of call, send and transfer
Learn how unchecked external calls in Solidity using call, send, and transfer create vulnerabilities, break smart wallets, and enable gas griefing—with safe patterns to fix them.
How to Audit an ERC-20 Token Contract
A practical walkthrough for auditing ERC-20 token contracts: standard compliance, mint/burn controls, fee-on-transfer pitfalls, centralization risks, and tooling.
Is My Token Safe? A Pre-Launch Security Checklist
Before you deploy, run through this technical checklist: ownership, mint caps, upgradeability, liquidity locks, and automated scanning to catch critical bugs early.
What Is Slither? A Practical Guide to the Solidity Static Analyzer
Learn what Slither is, how its static analysis detectors work, how to run it on your Solidity contracts, and where its limits lie. A practical technical guide.
What Is Mythril? Symbolic Execution for Smart Contract Security
Learn what Mythril is, how symbolic execution finds smart contract vulnerabilities, what it catches, and where its limits are. A practical guide for Solidity developers.
What Is Echidna? Property-Based Fuzzing for Smart Contracts
Learn how Echidna fuzzing tests Solidity smart contracts by generating thousands of inputs to break invariants—and what it finds that static analysis misses.
How Much Does a Smart Contract Audit Cost?
Smart contract audit costs range from $5,000 to $100,000+. Learn what drives pricing, typical timelines, and how automated scanning fits in as a first layer.
Automated Scanners vs Manual Audits: What Is the Difference?
Honest breakdown of automated vs manual audit: what each catches, false positive rates, cost, speed, and how to combine both for real smart contract security.
Flash Loan Attacks Explained (With Real Examples)
Learn how flash loan attacks work, how attackers chain them with oracle manipulation and economic exploits, real-world cases, and how to defend your contracts.
Front-Running and MEV in Smart Contracts
Learn how front-running smart contract vulnerabilities work, what MEV means for your protocol, and which design patterns reduce sandwich attacks and mempool exploits.
Denial of Service (DoS) Vulnerabilities in Smart Contracts
Learn how denial of service smart contract vulnerabilities work—unbounded loops, gas-limit DoS, blocking external calls—and how to fix them with pull-over-push.
delegatecall Vulnerabilities and Proxy Storage Collisions
Learn how delegatecall vulnerabilities cause proxy storage collisions, uninitialized implementation takeovers, and how to write safe upgradeable contracts.
Price Oracle Manipulation Attacks
Learn how oracle manipulation attacks exploit on-chain spot prices, why AMM pools are vulnerable, and how TWAP and robust oracles protect your protocol.
Security of Upgradeable Smart Contracts (Proxies)
Learn how to secure upgradeable smart contracts: Transparent vs UUPS proxies, initializer pitfalls, storage gaps, admin-key risks, and upgrade governance best practices.
NFT (ERC-721) Smart Contract Security Pitfalls
Explore critical NFT ERC-721 security vulnerabilities: safeMint reentrancy, mint supply bugs, metadata risks, royalty bypass, access control flaws, and randomness pitfalls.
Signature Replay Attacks and EIP-712
Learn how signature replay attacks exploit ecrecover, missing nonces, and domain separators—and how EIP-712 typed data and proper permit() design stop them.
Rug Pull Red Flags: How to Spot a Risky Token Contract
Learn to identify rug pull red flags in Solidity token contracts: uncapped mints, hidden owner privileges, honeypot logic, unlocked liquidity, and dangerous proxies.
Static Analysis for Solidity with Aderyn and Semgrep
Learn how Aderyn and Semgrep extend Solidity static analysis beyond Slither, how to write custom rules, and where each tool fits in your security workflow.
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