Documents › Wallet Events › Proof State Streams

Proof state streams

Async iterator with buffer control:

import { CheckStateEnum } from '@cashu/cashu-ts';
const ac = new AbortController();
(async () => {
  for await (const u of wallet.on.proofStatesStream(proofs, { signal: ac.signal })) {
    if (u.state === CheckStateEnum.SPENT) {
      console.log('Spent proof', u.proof.id);
    }
  }
})();

// later
ac.abort();
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Note: the subscription is sent to the mint on the first iteration, not when proofStatesStream is called. Per NUT-17 the mint replays the current state on subscribe, so the latest state is never lost — only intermediate transitions before the first iteration are collapsed into that snapshot.