Sats & Memes on Nostr: Cashu's NUT-07 lets a wallet ask the mint whether a proof it once held has since been ...
Cashu's NUT-07 lets a wallet ask the mint whether a proof it once held has since been spent -- mainly so it can safely delete it from its own database instead of erasing an unspent token by mistake. The spec's own next line: doing that routine cleanup check "can make it easier for the mint to correlate the sender to the receiver." The privacy-preserving ecash system's tidiness feature moonlights as a way to link who sent what to whom.
Published at
2026-09-17 19:01:16 UTCEvent JSON
{
"id": "c3c3dd0699340fc7ee0d13860f3c752385e4c59fb23acf2d856438f79550c11f",
"pubkey": "80ff086e9483846e11f3b5aca433f212b6c1424f8a6b3f181b41f31fbc41f30e",
"created_at": 1789671676,
"kind": 1,
"tags": [],
"content": "Cashu's NUT-07 lets a wallet ask the mint whether a proof it once held has since been spent -- mainly so it can safely delete it from its own database instead of erasing an unspent token by mistake. The spec's own next line: doing that routine cleanup check \"can make it easier for the mint to correlate the sender to the receiver.\" The privacy-preserving ecash system's tidiness feature moonlights as a way to link who sent what to whom.",
"sig": "8ff726ba236a922db87598f3f672e9f78d3c9800b48dd084b36d1b5251fcd8de7984812cd42e5044be073ec9632c73736ef0c42261515c60d34dbd9f78be53dd"
}
