From nadav at suredbits.com  Wed Jun  5 16:37:59 2019
From: nadav at suredbits.com (Nadav Kohen)
Date: Wed, 5 Jun 2019 11:37:59 -0500
Subject: [Lightning-dev] BOLT #3: Shouldn't timeout be included in the
 script of "Offered HTLC Outputs" for the local node?
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Message-ID: <CALGTLwMVZ=G0VKY7CZmsexSTDo=Biuu2z2a2Tn5ow+FGs74T8Q@mail.gmail.com>

Hi Ugam,

I also ran into an issue understanding this a while back, here's a PR I
opened to try and make things more clear:
https://github.com/lightningnetwork/lightning-rfc/pull/601
Feel free to add to it or comment if you think things could be improved :)

Best,
Nadav

On Wed, Jun 5, 2019 at 11:33 AM Ugam Kamat <ugamkamat1 at gmail.com> wrote:

> Ah, now I see what you mean, it is locked with absolute timelock and hence
> I cannot broadcast that transaction. My apologies and thanks for the help!
>
>
>
> Ugam
>
>
>
> *From:* Ugam Kamat <ugamkamat1 at gmail.com>
> *Sent:* Wednesday, June 5, 2019 10:00 PM
> *To:* 'Pierre' <pm+lists at acinq.fr>
> *Cc:* 'lightning-dev' <lightning-dev at lists.linuxfoundation.org>
> *Subject:* RE: [Lightning-dev] BOLT #3: Shouldn't timeout be included in
> the script of "Offered HTLC Outputs" for the local node?
>
>
>
> Hey Pierre,
>
>
>
> That?s what I am having a hard time understanding. Although it is
> timelocked in the second stage HTLC-timeout, I can still spend the original
> commitment transaction although after some time. This is what my thought
> process is:
>
>
>
>    - Offer the Htlc output and sign the commitment transactions
>    - Broadcast the commitment transaction containing the offered HTLC
>    outputs to the main chain. The outputs of commitment tx are: (1) to remote;
>    (2) to local with to_self_delay and (3) to P2WSH (the script I pasted
>    earlier)
>    - Commitment transaction gets mined
>    - Spend the third output using 0 <remotehtlcsig> <localhtlcsig> 0 in
>    the witness stack which will send the outputs to <local_delayed_pubkey>
>    using to_self_delay
>
> Now I think when you say the HTLC time out transaction is timelocked, you
> are referring the to the to_self_delay when spending the htlc-timeout. But
> although there is that timeout, the commitment transaction is already
> broadcasted, and the P2WSH output is already sent to my public key
> (although with a delay I can still spend that without my counterparty?s
> assent). Now, my counterparty on the other hand  when he gets the
> pre-image, does not have the P2WSH output to claim his bitcoins with the
> pre-image because it has been already locked with my <local_delayed_pubkey>
> which I can spend when the to_senf_delay` is over
>
>
>
> Ugam
>
>
>
> *From:* Pierre <pm+lists at acinq.fr>
> *Sent:* Wednesday, June 5, 2019 9:35 PM
> *To:* Ugam Kamat <ugamkamat1 at gmail.com>
> *Cc:* lightning-dev <lightning-dev at lists.linuxfoundation.org>
> *Subject:* Re: [Lightning-dev] BOLT #3: Shouldn't timeout be included in
> the script of "Offered HTLC Outputs" for the local node?
>
>
>
> Hello Ugam,
>
>
>
> The HTLC-Timeout transaction
> <https://github.com/lightningnetwork/lightning-rfc/blob/master/03-transactions.md#htlc-timeout-and-htlc-success-transactions>
> is timelocked (with locktime=cltv_expiry).
>
>
>
> Cheers,
>
>
>
> Pierre
>
>
> _______________________________________________
> Lightning-dev mailing list
> Lightning-dev at lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/lightning-dev
>
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