BOLT 5: fix up opposing MUST & MUST NOT statements.#848
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We can't say "MUST spend via HTLC-success" and "MUST NOT reveal preimage", since the HTLC-success does exactly that! Let's simplify it. If you get the preimage from the outgoing HTLC, you need to spend the incoming. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
TheBlueMatt
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one nit, but looks good.
| from the outgoing HTLC; otherwise, it will lose funds by sending an outgoing | ||
| 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 |
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This feels awkward - maybe "final destination for the payment, and it knows the preimage bug it has not received the full payment. In this case, it must not reveal it"?
ariard
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Feb 22, 2021
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Thanks for clarifying this, a small nit
| 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 |
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t-bast
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| 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>. |
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I'm not sure what I offer is better, but the current wording is a bit hard to understand (at least for me).
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| 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>. | |
| 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 | |
| until the corresponding outgoing HTLC is settled, it must not reveal | |
| it.<sup>[Preimage-Extraction](https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002857.html)</sup>. |
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We can't say "MUST spend via HTLC-success" and "MUST NOT reveal preimage",
since the HTLC-success does exactly that!
Let's simplify it. If you get the preimage from the outgoing HTLC,
you need to spend the incoming.
Signed-off-by: Rusty Russell rusty@rustcorp.com.au
See: dcf6b0f