[Lightning-dev] Spending `to_local` output of commitment

[Benjamin Weintraub via Lightning-dev]

Hi all,

I have a question about commitments. If a peer force closes a channel by 
sending a commitment to the blockchain, what kind of witness script is needed 
to redeem the `to_local` funds? (assuming the `to_self_delay` has elapsed.) It 
seems that the transaction described here is for cooperative closures: 
https://github.com/lightning/bolts/blob/c74a3bbcf890799d343c62cb05fcbcdc952a1cf3/03-transactions.md#closing-transaction.
 But for force closures, I would think that the txin would need to be the 
`to_local` txout of the commitment.

Concretely, I have commited the following transaction on a local simnet bitcoin 
blockchain and mined 500 blocks on top of it. I want to spend vout[2], how can 
I generate such a transaction?


{
  "hash": "47d15337bb3c29c7c2881dd7cd912604b401ed221c66ea6f781b456d4983d451",
  "size": 444,
  "vsize": 279,
  "weight": 1113,
  "version": 2,
  "locktime": 551351761,
  "vin": [
    {
      "txid": 
"0248025b9447df8267d02d14c34ab9b269f52cd827132c70159a55cbf27ab3c1",
      "vout": 0,
      "scriptSig": {
        "asm": "",
        "hex": ""
      },
      "txinwitness": [
        "",
        
"3045022100d3f52ca04d6a71587c29592931e542b16a47f3e9e577f1869b416547d00c62dd0220485da35ad31ff71b4263b1a25f0ba9f35990e1c8d5ac848365bbd588c3ce83d701",
        
"3044022057fc3878e17a865c12d57b7885ed48f0d6122bd9e00511c8eac150180d1508d502205fd1d0674a41b3c0118d0b6c19b1c77d35fc95bb89f929da6478f22e94dbf5ce01",
        
"5221038acdafe305edd06e91706ee687a091be306f0f29bcbda52dadde084bbaa36c902103d8fd53b9b43638c2255e1abd6f134a0232d2fba65527252c4eb81f926ddf50ad52ae"
      ],
      "sequence": 2161061453
    }
  ],
  "vout": [
    {
      "value": 0.0000033,
      "n": 0,
      "scriptPubKey": {
        "asm": "0 
45ec86244376d47000ca6592783ba26f6b2ae619a24c8f5fad249b8c716955d6",
        "hex": 
"002045ec86244376d47000ca6592783ba26f6b2ae619a24c8f5fad249b8c716955d6",
        "reqSigs": 1,
        "type": "witness_v0_scripthash",
        "addresses": [
          "sb1qghkgvfzrwm28qqx2vkf8swazda4j4ese5fxg7hadyjdccutf2htqysq3qz"
        ]
      }
    },
    {
      "value": 0.0000033,
      "n": 1,
      "scriptPubKey": {
        "asm": "0 
502a17644b334482d0a3f589d9861af6e2105a9b7afd3f5c258efc98bb6aeeed",
        "hex": 
"0020502a17644b334482d0a3f589d9861af6e2105a9b7afd3f5c258efc98bb6aeeed",
        "reqSigs": 1,
        "type": "witness_v0_scripthash",
        "addresses": [
          "sb1q2q4pweztxdzg959r7kyanps67m3pqk5m0t7n7hp93m7f3wm2amksa0fysc"
        ]
      }
    },
    {
      "value": 0.0002,
      "n": 2,
      "scriptPubKey": {
        "asm": "0 
045553fc789494f16eff4cfa221d0294e140fb79772efeb7d8397d0ac1c4cf85",
        "hex": 
"0020045553fc789494f16eff4cfa221d0294e140fb79772efeb7d8397d0ac1c4cf85",
        "reqSigs": 1,
        "type": "witness_v0_scripthash",
        "addresses": [
          "sb1qq3248lrcjj20zmhlfnazy8gzjns5p7mewuh0ad7c897s4swye7zsyrm5pc"
        ]
      }
    },
    {
      "value": 0.009761,
      "n": 3,
      "scriptPubKey": {
        "asm": "0 
2d51ca420d0b6ab56c97ca2631d7304c9ad9025252ea71f3af8f97361679042e",
        "hex": 
"00202d51ca420d0b6ab56c97ca2631d7304c9ad9025252ea71f3af8f97361679042e",
        "reqSigs": 1,
        "type": "witness_v0_scripthash",
        "addresses": [
          "sb1q94gu5ssdpd4t2myhegnrr4esfjddjqjj2t48rua037tnv9neqshqm4z7yr"
        ]
      }
    }
  ],
  "blockhash": 
"0fa78bc7e9f6e0a60be71bb5fb2eaaf42a97895bb057f09d7cbb2c49120fa61d",
  "confirmations": 500,
  "time": 1682451410,
  "blocktime": 1682451410
}



Thanks in advance,

Ben

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