Actually the invoice contains the HASH to the payment preimage. Only if you've paud the invoice do you obtain the preimage over the lightning network. It is needed to settle the paynent and it is your proof of payment.
Actually the invoice contains the HASH to the payment preimage. Only if you've paud the invoice do you obtain the preimage over the lightning network. It is needed to settle the paynent and it is your proof of payment.
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