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Melting Proofs

Melting is the reverse of minting. It involves paying Proofs back to the mint to settle an external Lightning invoice. This process consists of three steps:

  1. Request a melt quote for the invoice.
  2. Submit the required Proofs (including a fee reserve, if applicable).
  3. Confirm whether the invoice was paid and collect any change.
warning

Mints only refund overpaid fees. To ensure your inputs match the required amount, use CashuWallet.send() beforehand to swap Proofs as needed.

const quote = await wallet.createMeltQuote(mintQuote.request);
const fee = quote.fee_reserve;

const {keep, send} = await wallet.send(10, proofs});

const response = await wallet.meltProofs(quote, send);

Fee Reserve and Change​

Mints may include a fee reserve to cover anticipated Lightning fees. The cashu-ts library automatically appends blank outputs to the melt request and mints new Proofs if change is returned.

Options​

meltProofs accepts a range of options to control the shape of the minted Proofs. Check out the API Reference for more information