lightning community – Open Channel Transaction with out RBF is caught

I can’t reply your entire questions, however I can provide you some assist.

From the bitcoin standpoint, you’ll be able to all the time spend a transaction output (TXO) if it’s not spent already by some confirmed transaction.
That mentioned, if you happen to opened a channel however the funding transaction will not be confirmed you’ll be able to spend the TXO that funded the channel, however I do not understand how lightningd would react to this.

You mentioned you might have closed the channel. For those who funds are nonetheless caught it means each the funding channel and shut channel transactions are unconfirmed within the mempool.

I might attempt to spend the TXO within the shut TX in a child-pays-for-parent style. Nonetheless, when attempting to breed that situation in regtest I discover troubles with the clightning person interface.

I did the next to simulate your scenario:

1. I create a channel with peer

$ l1-cli fundchannel 0397d48baf82cf731fc8967c16e3d9575f10606bdf481738eb9cafeda29d0e3d67 1000000sat
{
   "tx": "02000000000101ee026cb7c44f482eb9b1e11f6faf11956ac26f4cdb7e0c1aa9ef94025ec412c30000000000fdffffff0240420f000000000022002075e9a102dbb348646e2f1804cc3cfec9edb6f5551a074f33a615f29cbd45eeaa4c5bd70500000000160014deb1f4e1123694ca3e418cefe496d3c26b0ddde202473044022068b402d53f16204324b28607eca046a4f7121d8f83c62e17de9c9131e307b5cf022077a3aa538469f9e0983cce98c3de4c5427731b398ed395d9614cf7b54d4f5cdd012102f5093f8fd66c909fc72ee556e70cb038ae92b03fd1b56d710cf53b3cc019868e73000000",
   "txid": "11b8967c62c584da9bbba5243d61bc95b4da210760bca04adb7c349319edba19",
   "channel_id": "9dfe0df4c502c31e92c266bfa28af18d6f6d11a0b0197b838797f8c990625168",
   "outnum": 0
}

2. I closed the channel

$ l1-cli -k shut id=9dfe0df4c502c31e92c266bfa28af18d6f6d11a0b0197b838797f8c990625168 
# Sending closing charge provide 139sat, with vary 139sat-183sat
# Obtained closing charge provide 139sat, with vary 139sat-1000000sat
{
   "tx": "020000000119baed1993347cdb4aa0bc600721dab495bc613d24a5bb9bda84c5627c96b8110000000000ffffffff01b5410f00000000001600141b420a80810dda8fd3621e6ba4ce14ce85b6877e00000000",
   "txid": "e6a7d6cc0960f0f7481a3e9a18b9d9cc18ee695dd626a597883be4599c043699",
   "kind": "mutual"
}

At this level each the funding (11b896...) and settlement (e6a7d6cc...) transactions are within the mempool and unconfirmed.
The scenario is proven within the diagram under

tx:c312c...(confirmed) ---> tx:11b89... (funding tx unconfirmed) ---> tx:e6a7d6cc... (settlement, unconfirmed)

My concept is to spend the settlement output with the next charge.
Nonetheless, I’ve issues with lightning-cli to get this working.

If I attempt to spend the settlement output, which is managed by my pockets:

$ l1-cli -k txprepare outputs="[{"bcrt1qx77wq9fyxvhsncswpl6kgqpnc49m5e5lzmls0g":"all"}]" utxos="["e6a7d6cc0960f0f7481a3e9a18b9d9cc18ee695dd626a597883be4599c043699:0"]" feerate=100
{
   "code": -32602,
   "message": "Unknown UTXO e6a7d6cc0960f0f7481a3e9a18b9d9cc18ee695dd626a597883be4599c043699:0"
}

So in all probability lightnind is saying: “that UTXO will not be within the blockchain, I can’t spend it”.

I attempted a work-around, making a PSBT with bitcoin-cli:

$ bt-cli createpsbt "[{"txid":"e6a7d6cc0960f0f7481a3e9a18b9d9cc18ee695dd626a597883be4599c043699","vout":0}]" "[{"bcrt1qx77wq9fyxvhsncswpl6kgqpnc49m5e5lzmls0g":0.00900000}]"
cHNidP8BAFICAAAAAZk2BJxZ5DuIl6Um1l1p7hjM2bkYmj4aSPfwYAnM1qfmAAAAAAD9////AaC7DQAAAAAAFgAUN7zgFSQzLwniDg/1ZAAzxUu6Zp8AAAAAAAAA

after which signing it with lightning-cli:

$ l1-cli signpsbt cHNidP8BAFICAAAAAZk2BJxZ5DuIl6Um1l1p7hjM2bkYmj4aSPfwYAnM1qfmAAAAAAD9////AaC7DQAAAAAAFgAUN7zgFSQzLwniDg/1ZAAzxUu6Zp8AAAAAAAAA
{
   "code": -1,
   "message": "No pockets inputs to signal"
}

Plainly clightning does not prefer to signal transactions inputs that aren’t confirmed.

I might spend the TXO that funded the channel for the reason that funding transaction is unconfirmed.

$ l1-cli -k txprepare outputs="[{"bcrt1qx77wq9fyxvhsncswpl6kgqpnc49m5e5lzmls0g":"all"}]" utxos="["c312c45e0294efa91a0c7edb4c6fc26a9511af6f1fe1b1b92e484fc4b76c02ee:0"]" feerate=100
{
   "code": -32602,
   "message": "UTXO c312c45e0294efa91a0c7edb4c6fc26a9511af6f1fe1b1b92e484fc4b76c02ee:0 already reserved"
}

So, clightning sees that despite the fact that that TXO will not be confirmed it’s spent by a channel funding.

Let me attempt forcing once more with bitcoin core PSBT:

$ bt-cli createpsbt "[{"txid":"c312c45e0294efa91a0c7edb4c6fc26a9511af6f1fe1b1b92e484fc4b76c02ee","vout":0}]" "[{"bcrt1qx77wq9fyxvhsncswpl6kgqpnc49m5e5lzmls0g":0.98900000}]"
cHNidP8BAFICAAAAAe4CbLfET0guubHhH2+vEZVqwm9M234MGqnvlAJexBLDAAAAAAD9////ASAY5QUAAAAAFgAUN7zgFSQzLwniDg/1ZAAzxUu6Zp8AAAAAAAAA

after which get a signature from clightning pockets:

$  l1-cli signpsbt cHNidP8BAFICAAAAAe4CbLfET0guubHhH2+vEZVqwm9M234MGqnvlAJexBLDAAAAAAD9////ASAY5QUAAAAAFgAUN7zgFSQzLwniDg/1ZAAzxUu6Zp8AAAAAAAAA
{
   "signed_psbt": "cHNidP8BAFICAAAAAe4CbLfET0guubHhH2+vEZVqwm9M234MGqnvlAJexBLDAAAAAAD9////ASAY5QUAAAAAFgAUN7zgFSQzLwniDg/1ZAAzxUu6Zp8AAAAAAAEBHyae5gUAAAAAFgAUrxY3yj79dai67Z9mJ4hHAjQSIzMiAgL1CT+P1myQn8cu5VbnDLA4rpKwP9G1bXEM9Ts8wBmGjkcwRAIgMdOln+3Bzrm5lWqUrBbtEleqYgclYdwSadbs7T8V+18CIFTRsrlwhdZrvrG+UiCGf44+TJrF+Oqj4w+hLFmucBcfASIGAvUJP4/WbJCfxy7lVucMsDiukrA/0bVtcQz1OzzAGYaOCK8WN8oAAAAAACICAoqr3sVLia14vPyrtYQRxA+wniCHWDV34AMh8C5p18haCDe84BUHAAAAAA=="
}

OK, so this time now we have a signature, now we will assemble the transaction

$ bt-cli finalizepsbt "cHNidP8BAFICAAAAAe4CbLfET0guubHhH2+vEZVqwm9M234MGqnvlAJexBLDAAAAAAD9////ASAY5QUAAAAAFgAUN7zgFSQzLwniDg/1ZAAzxUu6Zp8AAAAAAAEBHyae5gUAAAAAFgAUrxY3yj79dai67Z9mJ4hHAjQSIzMiAgL1CT+P1myQn8cu5VbnDLA4rpKwP9G1bXEM9Ts8wBmGjkcwRAIgMdOln+3Bzrm5lWqUrBbtEleqYgclYdwSadbs7T8V+18CIFTRsrlwhdZrvrG+UiCGf44+TJrF+Oqj4w+hLFmucBcfASIGAvUJP4/WbJCfxy7lVucMsDiukrA/0bVtcQz1OzzAGYaOCK8WN8oAAAAAACICAoqr3sVLia14vPyrtYQRxA+wniCHWDV34AMh8C5p18haCDe84BUHAAAAAA=="
{
  "hex": "02000000000101ee026cb7c44f482eb9b1e11f6faf11956ac26f4cdb7e0c1aa9ef94025ec412c30000000000fdffffff012018e5050000000016001437bce01524332f09e20e0ff5640033c54bba669f02473044022031d3a59fedc1ceb9b9956a94ac16ed1257aa62072561dc1269d6eced3f15fb5f022054d1b2b97085d66bbeb1be5220867f8e3e4c9ac5f8eaa3e30fa12c59ae70171f012102f5093f8fd66c909fc72ee556e70cb038ae92b03fd1b56d710cf53b3cc019868e00000000",
  "full": true
}

and broadcast it

$ bt-cli sendrawtransaction 02000000000101ee026cb7c44f482eb9b1e11f6faf11956ac26f4cdb7e0c1aa9ef94025ec412c30000000000fdffffff012018e5050000000016001437bce01524332f09e20e0ff5640033c54bba669f02473044022031d3a59fedc1ceb9b9956a94ac16ed1257aa62072561dc1269d6eced3f15fb5f022054d1b2b97085d66bbeb1be5220867f8e3e4c9ac5f8eaa3e30fa12c59ae70171f012102f5093f8fd66c909fc72ee556e70cb038ae92b03fd1b56d710cf53b3cc019868e00000000
41304c4e992a0718d29cf7c46adb0f361c319d31b92eeb8d7dbc811aebc2b39f

If the miners embrace the final transaction 41304..., then the funding 11b896... and settlement e6a7... will probably be invalid. However you continue to have your funds.

tx:c312c...(confirmed) -X-> tx:11b89... (funding tx unconfirmed) -X-> tx:e6a7d6cc... (settlement, unconfirmed)
|
+---> tx:41304... (confirmed)

Uncomfortable side effects

clightning sees the brand new funds, however it’s nonetheless ready for the earlier transactions to verify:

$ l1-cli listfunds
{
   "outputs": [
      {
         "txid": "11b8967c62c584da9bbba5243d61bc95b4da210760bca04adb7c349319edba19",
         "output": 1,
         "amount_msat": 97999692000,
         "scriptpubkey": "0014deb1f4e1123694ca3e418cefe496d3c26b0ddde2",
         "address": "bcrt1qm6clfcgjx62v50jp3nh7f9kncf4smh0z2v5q3d",
         "status": "unconfirmed",
         "reserved": false
      },
      {
         "txid": "41304c4e992a0718d29cf7c46adb0f361c319d31b92eeb8d7dbc811aebc2b39f",
         "output": 0,
         "amount_msat": 98900000000,
         "scriptpubkey": "001437bce01524332f09e20e0ff5640033c54bba669f",
         "address": "bcrt1qx77wq9fyxvhsncswpl6kgqpnc49m5e5lzmls0g",
         "status": "confirmed",
         "blockheight": 116,
         "reserved": false
      }
   ],
   "channels": [
      {
         "peer_id": "0232a73b00b1e4eb6ee1787785640dca55a67bf5e6b338e42efff6a9b21da26c93",
         "connected": true,
         "state": "CHANNELD_NORMAL",
         "channel_id": "a8664ad1bbc4debd16ea2a49b07167f35d3dd9cacac60c0ad6d60fbb76ce78e7",
         "short_channel_id": "103x1x1",
         "our_amount_msat": 1000000000,
         "amount_msat": 1000000000,
         "funding_txid": "c312c45e0294efa91a0c7edb4c6fc26a9511af6f1fe1b1b92e484fc4b76c02ee",
         "funding_output": 1
      }
   ]
}