Paste any transaction hash. Your browser works out the card it produces and shows you the artwork, the code and the tier — before you have traded anything, and without asking anyone's permission.

It works because a card is a pure function of two values: the hash of the transaction that emitted the swap, and the index of that log within it. Nothing else is involved — not the trader, not the block, not the amount. The same input always gives the same card, to anybody, forever.

If the transaction happens to be one this site has indexed, the page also asks the API what it stored and tells you plainly whether the two agree. That is the part that makes the odds checkable rather than merely claimed.

Printed from the running function itself, not from a copy kept on this page. The whole file is at /derive.js, and it is the same file the indexer imports.