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 the transaction. Nothing else is involved — not the trader, not the block, not the amount.

Enter those two values and your browser will compute the card itself, using the same file the server uses. Then it asks the API what it stored and tells you whether the two agree.

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.