📅 Original date posted:2021-09-22
📝 Original message:
Hi,
This is exactly what the dual funding proposal provides:
https://github.com/lightningnetwork/lightning-rfc/pull/851
Cheers,
Bastien
Le mer. 22 sept. 2021 à 07:29, Ole Henrik Skogstrøm <oleskogstrom at gmail.com>
a écrit :
> Hi
>
> I have found a way of opening balanced channels using LND's psbt option
> when opening channels. What I'm doing is essentially just joining funded
> PSBTs before signing and submitting them. This makes it possible to open a
> balanced channel between two nodes or open a ring of balanced channels
> between multiple nodes (ROF).
>
> I found this interesting, however I don't know if this is somehow unsafe
> or for some other reason a bad idea. If not, then it could be an
> interesting alternative to only being able to open unbalanced channels.
>
> To do this efficiently, nodes need to collaborate by sending PSBTs back
> and forth to each other and doing this manually is a pain, so if this makes
> sense to do, it would be best to automate it through a client.
>
> ----------------------
> --- Here is an example of the complete flow for a single channel:
> ----------------------
>
> ** Node A: generates a new address and sends address to Node B *(lncli
> newaddress p2wkh)
>
> ** Node A starts an Interactive channel **open** to Node B* *using psbt*
> (lncli openchannel --psbt <node_b_pubkey> 2000000 1000000)
>
> ** Node A funds the channel address *(bitcoin-cli walletcreatefundedpsbt
> [] '[{"<channel_address>":0.02}]')
>
> ** Node B funds the refund transaction to Node A and sends PSBT back to
> Node A (*bitcoin-cli walletcreatefundedpsbt []
> '[{"<node_a_return_address>":0.01}]')
>
> * *Node A joins the two PSBTs and sends it back to Node B (*bitcoin-cli
> joinpsbts '["<channel_open_psbt>", "<node_b_return_to_node_a_psbt>"]')
>
> ** Node B verifies the content and signs the joined PSBT before sending it
> back to Node A *(bitcoin-cli walletprocesspsbt <joined_psbt>)
>
> ** Node A: Verifies the content and signs the joined PSBT *(bitcoin-cli
> walletprocesspsbt <joined_psbt>)
>
> ** Node A: Completes channel open by publishing the fully signed PSBT*
>
>
> ----------------------
> --- Here is an example of the complete flow for a ring of channels between
> multiple nodes:
> ----------------------
>
> ** Node A starts an Interactive open channel to Node B using psbt* (lncli
> openchannel --psbt --no_publish <node_b_pubkey> 2000000 1000000)
> ** Node A funds the channel address* (bitcoin-cli walletcreatefundedpsbt
> [] '[{"<channel_address>":0.02}]')
>
> ** Node B starts an Interactive open channel to Node C using psbt* (lncli
> openchannel --psbt --no_publish <node_b_pubkey> 2000000 1000000)
> ** Node B funds the channel address* (bitcoin-cli walletcreatefundedpsbt
> [] '[{"<channel_address>":0.02}]')
>
> ** Node C starts an Interactive open channel to Node A using psbt* (lncli
> openchannel --psbt <node_b_pubkey> 2000000 1000000)
> ** Node C funds the channel address *(bitcoin-cli walletcreatefundedpsbt
> [] '[{"<channel_address>":0.02}]')
>
> ** Node B and C sends Node A their PSBTs*
>
> ** Node A joins all the PSBTs* (bitcoin-cli joinpsbts
> '["<A_funded_channel_psbt>", "<B_funded_channel_psbt>",
> "<C_funded_channel_psbt>"]')
>
> Using (bitcoin-cli walletprocesspsbt <joined_psbt>):
>
>
>
> ** Node A verifies and signs the PSBT and sends it to Node B (1/3
> signatures)* Node B verifies and signs the PSBT and sends it to Node C (2/3
> signatures)* Node C verifies and signs the PSBT (3/3 signatures) before
> sending it to Node A and B.*
>
>
> ** Node A completes channel open (no_publish)* Node B completes channel
> open (no_publish)* Node C completes channel open and publishes the
> transaction.*
>
> --
> Ole Henrik Skogstrøm
>
> _______________________________________________
> Lightning-dev mailing list
> Lightning-dev at lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/lightning-dev
>
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Bastien TEINTURIER [ARCHIVE] /
npub17f…ntr0s
2023-06-09 13:03:52
in reply to nevent1q…82y3
Author Public Key
npub17fjkngg0s0mfx4uhhz6n4puhflwvrhn2h5c78vdr5xda4mvqx89swntr0sPublished at
2023-06-09 13:03:52Event JSON
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"pubkey": "f26569a10f83f6935797b8b53a87974fdcc1de6abd31e3b1a3a19bdaed8031cb",
"created_at": 1686315832,
"kind": 1,
"tags": [
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"content": "📅 Original date posted:2021-09-22\n📝 Original message:\nHi,\n\nThis is exactly what the dual funding proposal provides:\nhttps://github.com/lightningnetwork/lightning-rfc/pull/851\n\nCheers,\nBastien\n\nLe mer. 22 sept. 2021 à 07:29, Ole Henrik Skogstrøm \u003coleskogstrom at gmail.com\u003e\na écrit :\n\n\u003e Hi\n\u003e\n\u003e I have found a way of opening balanced channels using LND's psbt option\n\u003e when opening channels. What I'm doing is essentially just joining funded\n\u003e PSBTs before signing and submitting them. This makes it possible to open a\n\u003e balanced channel between two nodes or open a ring of balanced channels\n\u003e between multiple nodes (ROF).\n\u003e\n\u003e I found this interesting, however I don't know if this is somehow unsafe\n\u003e or for some other reason a bad idea. If not, then it could be an\n\u003e interesting alternative to only being able to open unbalanced channels.\n\u003e\n\u003e To do this efficiently, nodes need to collaborate by sending PSBTs back\n\u003e and forth to each other and doing this manually is a pain, so if this makes\n\u003e sense to do, it would be best to automate it through a client.\n\u003e\n\u003e ----------------------\n\u003e --- Here is an example of the complete flow for a single channel:\n\u003e ----------------------\n\u003e\n\u003e ** Node A: generates a new address and sends address to Node B *(lncli\n\u003e newaddress p2wkh)\n\u003e\n\u003e ** Node A starts an Interactive channel **open** to Node B* *using psbt*\n\u003e (lncli openchannel --psbt \u003cnode_b_pubkey\u003e 2000000 1000000)\n\u003e\n\u003e ** Node A funds the channel address *(bitcoin-cli walletcreatefundedpsbt\n\u003e [] '[{\"\u003cchannel_address\u003e\":0.02}]')\n\u003e\n\u003e ** Node B funds the refund transaction to Node A and sends PSBT back to\n\u003e Node A (*bitcoin-cli walletcreatefundedpsbt []\n\u003e '[{\"\u003cnode_a_return_address\u003e\":0.01}]')\n\u003e\n\u003e * *Node A joins the two PSBTs and sends it back to Node B (*bitcoin-cli\n\u003e joinpsbts '[\"\u003cchannel_open_psbt\u003e\", \"\u003cnode_b_return_to_node_a_psbt\u003e\"]')\n\u003e\n\u003e ** Node B verifies the content and signs the joined PSBT before sending it\n\u003e back to Node A *(bitcoin-cli walletprocesspsbt \u003cjoined_psbt\u003e)\n\u003e\n\u003e ** Node A: Verifies the content and signs the joined PSBT *(bitcoin-cli\n\u003e walletprocesspsbt \u003cjoined_psbt\u003e)\n\u003e\n\u003e ** Node A: Completes channel open by publishing the fully signed PSBT*\n\u003e\n\u003e\n\u003e ----------------------\n\u003e --- Here is an example of the complete flow for a ring of channels between\n\u003e multiple nodes:\n\u003e ----------------------\n\u003e\n\u003e ** Node A starts an Interactive open channel to Node B using psbt* (lncli\n\u003e openchannel --psbt --no_publish \u003cnode_b_pubkey\u003e 2000000 1000000)\n\u003e ** Node A funds the channel address* (bitcoin-cli walletcreatefundedpsbt\n\u003e [] '[{\"\u003cchannel_address\u003e\":0.02}]')\n\u003e\n\u003e ** Node B starts an Interactive open channel to Node C using psbt* (lncli\n\u003e openchannel --psbt --no_publish \u003cnode_b_pubkey\u003e 2000000 1000000)\n\u003e ** Node B funds the channel address* (bitcoin-cli walletcreatefundedpsbt\n\u003e [] '[{\"\u003cchannel_address\u003e\":0.02}]')\n\u003e\n\u003e ** Node C starts an Interactive open channel to Node A using psbt* (lncli\n\u003e openchannel --psbt \u003cnode_b_pubkey\u003e 2000000 1000000)\n\u003e ** Node C funds the channel address *(bitcoin-cli walletcreatefundedpsbt\n\u003e [] '[{\"\u003cchannel_address\u003e\":0.02}]')\n\u003e\n\u003e ** Node B and C sends Node A their PSBTs*\n\u003e\n\u003e ** Node A joins all the PSBTs* (bitcoin-cli joinpsbts\n\u003e '[\"\u003cA_funded_channel_psbt\u003e\", \"\u003cB_funded_channel_psbt\u003e\",\n\u003e \"\u003cC_funded_channel_psbt\u003e\"]')\n\u003e\n\u003e Using (bitcoin-cli walletprocesspsbt \u003cjoined_psbt\u003e):\n\u003e\n\u003e\n\u003e\n\u003e ** Node A verifies and signs the PSBT and sends it to Node B (1/3\n\u003e signatures)* Node B verifies and signs the PSBT and sends it to Node C (2/3\n\u003e signatures)* Node C verifies and signs the PSBT (3/3 signatures) before\n\u003e sending it to Node A and B.*\n\u003e\n\u003e\n\u003e ** Node A completes channel open (no_publish)* Node B completes channel\n\u003e open (no_publish)* Node C completes channel open and publishes the\n\u003e transaction.*\n\u003e\n\u003e --\n\u003e Ole Henrik Skogstrøm\n\u003e\n\u003e _______________________________________________\n\u003e Lightning-dev mailing list\n\u003e Lightning-dev at lists.linuxfoundation.org\n\u003e https://lists.linuxfoundation.org/mailman/listinfo/lightning-dev\n\u003e\n-------------- next part --------------\nAn HTML attachment was scrubbed...\nURL: \u003chttp://lists.linuxfoundation.org/pipermail/lightning-dev/attachments/20210922/7eca3d87/attachment.html\u003e",
"sig": "dd279e16a0c2acaf91ce0c0c7fc235eb1852744ccf4c20f6379b5aaa1ade228269348eaf67d6df6c71e378a0e70031713fdbcbada7c170e8e5be2662c0f675d5"
}