blockchainProhard

Phantom burn

CACTF2026

Task: Harden a TypeScript and Solidity archive service whose chain receipts crossed several unverified trust boundaries. Solution: Pin and decode canonical events, unify receipt identity, verify ownership, and consume grants once.

blockchain solidity typescript authorization replay_protection trust_boundary

receipt_verification_hardeningevent_emitter_pinningcanonical_receipt_identityprincipal_bindingcapability_consumption

$ ls tags/ techniques/

blockchain solidity typescript authorization replay_protection trust_boundary

receipt_verification_hardeningevent_emitter_pinningcanonical_receipt_identityprincipal_bindingcapability_consumption

Analysis

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$ python3 exploit.py --target 192.168.1.1 --port 8080
[*] Connecting to target...
[+] Shell obtained!

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