02b58a1376

bitcoin

deleted by author

lightning

Currently I have a very small channel.

As I need to swap in some on-chain sats (much bigger amount than my actual channel capacity), what will happen?

As far as I understood, there is no fee for swapping in from on chain, however since my channel is very small, Phoenix will need to make an on-chain tx to enlarge it, right?

So, I will pay two on-chain tx + 1% of the sats I am sending, correct?

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Unexpected fees in Lightning channel open and close (Regtest)

I'm running a local Lightning Network setup (regtest) with two nodes.  

I want to open a **1,000,000 sat capacity** channel, and I use the following command:  

```bash
lncli2 openchannel --node_key "02abb632deeb44eeac2eab7b22eedc72f4cec102d69cc536262ab6bf706a8e6322" \
                   --local_amt 1000000 \
                   --utxo "0e9e974441b6559238907ee225ad7b0fbc6d08fb4cadcd61738a829a23a2914e:0" \
                   --sat_per_vbyte 0 \
                   --private
```

However, I get this error:  

```
[lncli] rpc error: code = Unknown desc = not enough witness outputs to create funding transaction, 
need 0.00106087 BTC only have 0.00100000 BTC available
```

If I increase the funding amount to **0.00106087 BTC**, it works. But where do these extra **6,087 sats** come from?  

At this point, the channel is successfully opened, and the details are as follows:  

```json
{
  "capacity": "1000000",
  "local_chan_reserve_sat": "10000",
  "remote_chan_reserve_sat": "10000",
  "commit_fee": "3140",
  "local_balance": "996530",
  "remote_balance": "0"
}
```

Breaking this down:  

```
capacity - 3140 (commit_fee) = 996860
996860 - 330 (anchor) = 996530
```

Everything checks out so far.  

Next, I pay a **100,000 sat** invoice, and the balances update correctly:  

```json
{
  "capacity": "1000000",
  "local_balance": "896530",
  "remote_balance": "100000"
}
```

So I close the channel:

```
lncli2 closechannel --chan_point "644a50bc8a60976510467e6
c0bb860bf8221d9d1abb918ffeb33ed0055ff9517:0" --sat_per_vbyte 0
```

After closing the channel, I inspect the transaction outputs:  

```json
"vout": [
  {
    "value": 0.00100000,
    "n": 0,
    "scriptPubKey": {
      "address": "bcrt1p7n9x5efymsfsjt0c74zkckcve9y7sh3vxms4wxzgqk47m992lt7sd2djyc"
    }
  },
  {
    "value": 0.00890350,
    "n": 1,
    "scriptPubKey": {
      "address": "bcrt1pr49yedmky48lcze5a3u458nh8m0mnlvuwekvxhxurqpwncx9mjpqx93qut"
    }
  }
]
```

Here’s the second problem: **6,000 sats have disappeared**.  

### Questions:  
1) Why do I need an extra **6,087 sats** to open the channel?  
2) Where do the **6,000 sats** go when closing the channel?  

Hi everyone,

noob here. 

Which privacy trade-offs do I have by using Phoenix?

If I understood well only the amount and next hop (but not final destination) are known to ACINQ node right?


Same if I am receiving a payment, right? Only previous hop and final amount?

Metadata and everything else is unknown to ACINQ, right?

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