clarity-security

Secure Clarity smart contracts prevent front-running vulnerabilities by implementing strict transaction ordering checks and commit-reveal schemes, ensuring malicious actors cannot exploit transaction sequencing on the Stacks blockchain.

Common access control vulnerabilities in Clarity smart contracts include misusing the tx-sender keyword and missing threshold checks, which allow unauthorized users to execute restricted functions and compromise contract state security.

Secure input validation in Clarity smart contracts requires explicit type checking, boundary enforcement, and assertion patterns to sanitize all external inputs before state modification, preventing unexpected contract behavior and exploits.

Using tx-sender incorrectly causes security flaws because it represents the immediate contract caller rather than the original transaction initiator, allowing malicious contracts to spoof identities and bypass access controls.

You can use a security checklist to review DeFi protocol contracts on Stacks by systematically verifying access controls, input validation, state management, error handling, and front-running protection before mainnet deployment.

The best way to handle errors and state management in Clarity is to use explicit assertion checks, validate state transitions rigorously, and fail safely with clear error codes to prevent inconsistent contract states.