đź“… Original date posted:2019-06-05
đź“ť Original message:
Hey Nadav, that’s a good call as it’s not particularly intuitive when you try to read it. I’ll try to add to it if I can. Thanks!
Ugam
From: Nadav Kohen <nadav at suredbits.com>
Sent: Wednesday, June 5, 2019 10:08 PM
To: Ugam Kamat <ugamkamat1 at gmail.com>
Cc: Pierre <pm+lists at acinq.fr>; 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?
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 <mailto: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 <mailto:ugamkamat1 at gmail.com> >
Sent: Wednesday, June 5, 2019 10:00 PM
To: 'Pierre' <pm+lists at acinq.fr <mailto:pm%2Blists at acinq.fr> >
Cc: 'lightning-dev' <lightning-dev at lists.linuxfoundation.org <mailto: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 <mailto:pm+lists at acinq.fr> >
Sent: Wednesday, June 5, 2019 9:35 PM
To: Ugam Kamat <ugamkamat1 at gmail.com <mailto:ugamkamat1 at gmail.com> >
Cc: lightning-dev <lightning-dev at lists.linuxfoundation.org <mailto: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 <mailto:Lightning-dev at lists.linuxfoundation.org>
https://lists.linuxfoundation.org/mailman/listinfo/lightning-dev
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.linuxfoundation.org/pipermail/lightning-dev/attachments/20190605/6aa78160/attachment-0001.html>;
Ugam Kamat [ARCHIVE] /
npub1fw…2z20k
2023-06-09 12:55:04
in reply to nevent1q…2707
Author Public Key
npub1fw9jwk4jmln0ypqe25y8xrg09elwteedpcrdl69g6nzd9yqw44es52z20kPublished at
2023-06-09 12:55:04Event JSON
{
"id": "84842e437b97a6320f79c1395f865699e32574e196d10a605af2d62cf59b26c7",
"pubkey": "4b8b275ab2dfe6f204195508730d0f2e7ee5e72d0e06dfe8a8d4c4d2900ead73",
"created_at": 1686315304,
"kind": 1,
"tags": [
[
"e",
"76a5dc6ac27822f61e8403903666dbc0d382347d4232814805dd888718f0bc36",
"",
"root"
],
[
"e",
"b7943fc034820b16023e19607ae9ea123686f6f9c93b81d3ac5b1ccdacb35611",
"",
"reply"
],
[
"p",
"4640dfa33a2404507c1177a87aa949fcec805be1e1599e1df9bc823c35f5e208"
]
],
"content": "📅 Original date posted:2019-06-05\n📝 Original message:\nHey Nadav, that’s a good call as it’s not particularly intuitive when you try to read it. I’ll try to add to it if I can. Thanks!\n\n \n\nUgam\n\n \n\nFrom: Nadav Kohen \u003cnadav at suredbits.com\u003e \nSent: Wednesday, June 5, 2019 10:08 PM\nTo: Ugam Kamat \u003cugamkamat1 at gmail.com\u003e\nCc: Pierre \u003cpm+lists at acinq.fr\u003e; lightning-dev \u003clightning-dev at lists.linuxfoundation.org\u003e\nSubject: Re: [Lightning-dev] BOLT #3: Shouldn't timeout be included in the script of \"Offered HTLC Outputs\" for the local node?\n\n \n\nHi Ugam,\n\n \n\nI 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\n\nFeel free to add to it or comment if you think things could be improved :)\n\n \n\nBest,\n\nNadav\n\n \n\nOn Wed, Jun 5, 2019 at 11:33 AM Ugam Kamat \u003cugamkamat1 at gmail.com \u003cmailto:ugamkamat1 at gmail.com\u003e \u003e wrote:\n\nAh, 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!\n\n \n\nUgam\n\n \n\nFrom: Ugam Kamat \u003cugamkamat1 at gmail.com \u003cmailto:ugamkamat1 at gmail.com\u003e \u003e \nSent: Wednesday, June 5, 2019 10:00 PM\nTo: 'Pierre' \u003cpm+lists at acinq.fr \u003cmailto:pm%2Blists at acinq.fr\u003e \u003e\nCc: 'lightning-dev' \u003clightning-dev at lists.linuxfoundation.org \u003cmailto:lightning-dev at lists.linuxfoundation.org\u003e \u003e\nSubject: RE: [Lightning-dev] BOLT #3: Shouldn't timeout be included in the script of \"Offered HTLC Outputs\" for the local node?\n\n \n\nHey Pierre, \n\n \n\nThat’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:\n\n \n\n*\tOffer the Htlc output and sign the commitment transactions\n*\tBroadcast 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)\n*\tCommitment transaction gets mined\n*\tSpend the third output using 0 \u003cremotehtlcsig\u003e \u003clocalhtlcsig\u003e 0 in the witness stack which will send the outputs to \u003clocal_delayed_pubkey\u003e using to_self_delay\n\nNow 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 \u003clocal_delayed_pubkey\u003e which I can spend when the to_senf_delay` is over\n\n \n\nUgam\n\n \n\nFrom: Pierre \u003cpm+lists at acinq.fr \u003cmailto:pm+lists at acinq.fr\u003e \u003e \nSent: Wednesday, June 5, 2019 9:35 PM\nTo: Ugam Kamat \u003cugamkamat1 at gmail.com \u003cmailto:ugamkamat1 at gmail.com\u003e \u003e\nCc: lightning-dev \u003clightning-dev at lists.linuxfoundation.org \u003cmailto:lightning-dev at lists.linuxfoundation.org\u003e \u003e\nSubject: Re: [Lightning-dev] BOLT #3: Shouldn't timeout be included in the script of \"Offered HTLC Outputs\" for the local node?\n\n \n\nHello Ugam,\n\n \n\nThe HTLC-Timeout transaction \u003chttps://github.com/lightningnetwork/lightning-rfc/blob/master/03-transactions.md#htlc-timeout-and-htlc-success-transactions\u003e is timelocked (with locktime=cltv_expiry).\n\n \n\nCheers,\n\n \n\nPierre\n\n \n\n_______________________________________________\nLightning-dev mailing list\nLightning-dev at lists.linuxfoundation.org \u003cmailto:Lightning-dev at lists.linuxfoundation.org\u003e \nhttps://lists.linuxfoundation.org/mailman/listinfo/lightning-dev\n\n-------------- next part --------------\nAn HTML attachment was scrubbed...\nURL: \u003chttp://lists.linuxfoundation.org/pipermail/lightning-dev/attachments/20190605/6aa78160/attachment-0001.html\u003e",
"sig": "04b364d38e0c9f612569f3db9c76e8196bbec1039bf61ad49d9101b1bd2454115a03ba600b0b65bc9f6fd391d6da0d6b68f0861e29762d8d21aacf2761353507"
}