Stacks Clarity Smart Contract Security Guide

Why Clarity?

Clarity is a decidable smart contract language that prevents many common vulnerabilities by design. However, developers still need to understand security best practices.

Key Security Features

• No reentrancy by design
• Decidable - behavior fully analyzable before execution
• No unbounded loops preventing gas estimation attacks
• Built-in post-conditions for additional safety

(define-public (transfer (amount uint) (recipient principal))
  (begin
    ;; Post-condition ensures exact transfer
    (asserts! (> amount u0) (err u1))
    (try! (stx-transfer? amount tx-sender recipient))
    (ok true)
  )
)