What do the points and hearts on Nagasakiya card backs mean?

Turn any Nagasakiya card over and the back follows one design: a purple and silver diagonal plaid border, the card's number at the top left, an inset image, and a panel titled Zelda Item Guide that names and describes one item from Ocarina of Time. No. 48's panel covers the Bow and Arrow; No. 25's covers the Deku Shield; No. 45's covers the Master Sword.

Two numbers ride along. A green rupee icon carries a three digit points value, 028 on No. 48, 086 on No. 25, 092 on No. 45, 019 on No. 22, and a row of heart icons gives a second rating, five hearts on the biggest cards, three on No. 25. The system looks like a game printed on the backs, a way to compare and trade cards by their stats.

The inset image, meanwhile, does not always repeat the front. No. 48's back reprints its front painting, but No. 25's inset is a different render of Link aiming a bow, which means a Nagasakiya card can hold two artworks, one per side.

One honest blank: whether the points were ever redeemable for anything is undocumented. No campaign rules, prize lists or redemption records for the set have surfaced, and this page will not invent one. The points survive as numbers; their purpose did not survive with them.