$ cat writeup.md…
$ cat writeup.md…
hackadvisor
Task: Digital marketplace with single-use promo code (STARTER50) and $500 Elite Membership; TOCTOU race condition in redemption endpoint. Solution: Fire 300 concurrent threads via threading.Barrier to redeem the same promo code multiple times, accumulate $500, purchase Elite Membership to reveal the flag.
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$sign in$ grep --similar