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Fading QuicklySnapshot Window: 2026-08-21 19:10 UTC · ← Back to Crypto Overview
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Proving that a transaction was sandwiched — with no oracle, using a merkle path's left/right bits A transaction's position in a block is not a field anywhere in Ethereum — so "I was front-run" has never been a provable statement. It is not in the RLP, not in the receipt, not in any log, not returned by eth_call. It exists in exactly one place: the left/right bit-string of the transaction's merkle authentication path. I spent this hackathon turning that into a contract that reads the bits and settles money on the answer: a relay bonds CTC behind "you will not be sandwiched"; a victim hands over three same-block hashes; one Creditcoin transaction verifies all three, asserts front < victim < back, and pays the victim out of the bond. It has ruled on a real mainnet sandwich — block 25,764,741, positions 14 / 15 / 16.