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05-onchain.md
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@ -308,16 +308,19 @@ There are several possible cases for an offered HTLC:
HTLC. In this case, the recipient must use the preimage, once it receives it HTLC. In this case, the recipient must use the preimage, once it receives it
from the outgoing HTLC; otherwise, it will lose funds by sending an outgoing from the outgoing HTLC; otherwise, it will lose funds by sending an outgoing
payment without redeeming the incoming payment. payment without redeeming the incoming payment.
4. The HTLC is forwarded as above, but the recipient also happens to be the
final destination for the payment. In this case, it knows the preimage but
as it has not received the full payment, it must not reveal
it.<sup>[Preimage-Extraction](https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002857.html)</sup>.
This problem is most easily solved by only accepting preimages from
responses to corresponding outgoing HTLCs.
### Requirements ### Requirements
A local node: A local node:
- if it receives (or already possesses) a payment preimage for an unresolved - if it has been offered an unresolved HTLC, AND it has offered a corresponding outgoing HTLC, for which it receives or has already received a payment preimage (by seeing it resolved via an onchain HTLC-success transaction, or via `update_fulfill_htlc`):
HTLC output that it has been offered AND for which it has committed to an
outgoing HTLC:
- MUST *resolve* the output by spending it, using the HTLC-success - MUST *resolve* the output by spending it, using the HTLC-success
transaction. transaction.
- MUST NOT reveal its own preimage when it's not the final recipient.<sup>[Preimage-Extraction](https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002857.html)</sup>
- MUST resolve the output of that HTLC-success transaction. - MUST resolve the output of that HTLC-success transaction.
- otherwise: - otherwise:
- if the *remote node* is NOT irrevocably committed to the HTLC: - if the *remote node* is NOT irrevocably committed to the HTLC: