03 / The Digital Trade
SWAP OR
GET SCAMMED
A digital item. A suspicious trader. No undo button—unless you build a safer exchange. Test hash receipts, trigger escrow rules, and outsmart a vanishing partner.
Your actions change the exchange state. Learn why checking the item, locking both deposits and planning a refund matters.
MISSION 1
A fair swap?
A rival promises a rare item for your collectible. Who sends first?
Listing fingerprint, taken on trust from the listing (SHA-256):
Calculating…SHA-256 of item actually deposited:
Deposit, then verifyChoose your next action
Every action matters. Escrow is a fictional rule-enforcing intermediary in this puzzle; the hashes are real. You can test the risky approach and retry for free.
Preparing the listing fingerprint…
Trade result
Where this leads
From fictional escrow to cryptographic exchange
A hash confirms equality with the expected bytes, not ownership or fair delivery. Adaptor Gate explores conditional release and atomic swaps; Signed Bytes explains exactly what signatures bind.
Safety boundary: Every item, trader, escrow deposit and outcome is simulated for learning. Web Crypto SHA-256 checks fictional item bytes. Never submit valuables, funds or secrets. No account, ads, network calls or analytics.