12
votes
Accepted
Closing a channel in Lightning Network
The first three scenarios are indeed possible, the last one is identical to the second.
This is called a collaborative close. It has the advantage of using a lower on-chain fee since the transactions ...
- 9,319
7
votes
Accepted
Can a channel be closed while the funding tx is still stuck in the mempool?
Technically you can double spend the output that was used for the funding TX with a higher fee. Then the channel will never be opened. Practically I don't think any of the lightning network ...
- 11.7k
7
votes
Accepted
Eltoo: Does the relative locktime on the first UTXO set the lifetime of the channel?
Yes, you’re reading it right. The construction presented here has a limited lifetime since the Settle_0 transaction becomes valid at some point. However, later in the paper, the authors introduce an ...
- 71.6k
6
votes
Accepted
In a Lightning Network who commits to the blockchain the final transaction?
So let's imagine a Lightning Network made up of thousand of nodes. Transactions are routed until the moment comes where all the channels need to be closed and commited I presume. Which node actually ...
- 67.3k
6
votes
Can a channel be closed while the funding tx is still stuck in the mempool?
I started out writing this answer while trying to do it myself, but then found out that we don't yet have tools to manually edit partially signed Bitcoin transactions (PSBTs) which is the very last ...
- 9,319
5
votes
Accepted
Does eltoo require trusting watchtowers not to close channels?
I was intrigued by your question and tried to figure out whether any trustless solutions have been proposed.
I found a [Lightning-dev] mailing list thread positing a rough idea by ZmnSCPxj. Z-man ...
- 71.6k
5
votes
Accepted
Lightning close-channel transaction example?
The actual script implemented on Lightning Network is a little bit different from what you quoted. This is the script below and the specification is here
OP_IF
# Penalty transaction
<...
- 635
5
votes
Accepted
Would it be possible for miners to discriminate Lightning Network transactions?
The most distinguishing feature of a LN channel-opening transaction would be an OP_OR in the scriptPubKey of the channel-funding UTXO, where one side of the OP_OR requires two signatures, and the ...
- 8,802
4
votes
Can funds from a LN channel be recovered if both participants suffer data loss?
I don't know exactly how static channel backups are implemented in lnd and what is being saved there but I can give you some general thoughts and at least a partial answer.
If A and B both lost ...
- 11.7k
4
votes
Does LN require an on-chain "emergency lane" to mitigate systemic risks?
As far as I understand this is not needed. Let us assume we have an congested mempool and someone publishes an old channel state. This transaction will not be mined directly as the mempool is ...
- 11.7k
4
votes
Accepted
How do I set the our_to_self_delay parameter?
In Lightning the to_self_delay parameter is influenced by your peer. When a node opens a channel to yours, they advertise the minimum they are going to accept.
On Core-Lightning you can set the ...
- 6,036
4
votes
Eltoo: Does the relative locktime on the first UTXO set the lifetime of the channel?
Thanks for the feedback! I replaced "Update: 0" with a "Funding: 0" which is put on-chain when the channel is opened and the channel parties have both signed the first off-chain &...
3
votes
Lightning - Question about force-closures of channels and its impact on recovering funds
Sorry René, it seems you fell into a Bcasher trap here ;) OP phrased his question very vaguely and then proceeded to cry CENSORSHIP when you admitted there might be some truth contained in what he ...
- 847
3
votes
Accepted
Why is my LND node closing channels?
Many!
If you look at the BOLTs ( lightning RFC) you will find many situations in which nodes must fail a channel (meaning a force close) if something happens in an unexpected way while communicating ...
- 11.7k
3
votes
Accepted
For how long has a channel been inactive?
You can look for "last_update" field in getchaninfo output.
Below I also submitted https://github.com/edouardparis/lntop console screenshot which does the same thing.
3
votes
Accepted
Distinguishing Lightning channels on-chain
A lightning funding transaction is a P2WSH transaction, which appears on chain as paying to some random-looking script hash, but the redeemScript which can unlock and spend the money is not revealed ...
- 3,304
3
votes
Accepted
How does Lightning Node communicate with Bitcoin node?
Lightning Channels are just unbroadcast cached Bitcoin transactions. So yes, Lightning Nodes need to keep abreast of transactions on the Bitcoin blockchain to notice new channels getting opened, ...
- 71.6k
3
votes
Eltoo: Does the relative locktime on the first UTXO set the lifetime of the channel?
Current thinking is (I believe) just to have a funding utxo on chain ("Setup_0") which is always spent by some update transaction ("Update_1" etc; there is no "Settle_0") ...
- 326
2
votes
Lightning incentive for micro-cheating?
When the total capacity of the channel is less than it costs to close the channel, neither party has an incentive to close the channel.
If broadcasting an outdated commitment transaction returns some ...
- 71.6k
2
votes
How do Lightning channels interact with the blockchain?
Does opening a channel mean that a 2-to-2 multisig address (3xxxx) is created?
Yes. But it's not always a 3... address. Such addresses must be segwit, and there are two types: nested (3... address) ...
- 67.3k
2
votes
How is a doublespend prevented in the Lightning Network?
Alice and Bob open a channel with a fixed balance equal to the amount in the multi-sig address. The channel opens with a balance sheet which includes proof for both Alice and Bob’s balance.
Every ...
- 21
2
votes
How is a doublespend prevented in the Lightning Network?
Based on your comments, I think one fundamental issue you're missing is that to pay with LN, the other party has to be online at the time. There's no question of "what happens if Bob is offline" ...
- 19.7k
2
votes
How is a doublespend prevented in the Lightning Network?
Doublespends are not possible, because a payment on LN is only considered finalized once both payment channel owners have revoked the previous state of the payment channel by handing their partner a ...
- 71.6k
2
votes
When running a Lightning Network hub, who pays the fees when a transaction has to be broadcast to the blockchain?
It's possible that a node in the middle either either intentionally or unintentionally does not pay the next node down the line. The recourse is for the node that did not get paid to broadcast the ...
- 71.6k
2
votes
Can a channel be closed while the funding tx is still stuck in the mempool?
Cannot close a channel which has not been opened yet, but you can either bump the fee of the transaction by CPFP or cancel by double spending the unconfirmed input.
Notes when using LND:
Do not leave ...
- 86
2
votes
Accepted
How do I prevent lnd from participating in new channels?
You can set the option --maxpendingchannels=0 to disallow peers to open channels to your node.
- 228
2
votes
Accepted
How can a closing transaction in LN have more than 2 outputs?
There are 3 ways to close a channel.
The good way: mutual close
The bad way: force close
The ugly way: revoked close with penalty transaction
In the good case the closing tx should have 2 outputs as ...
- 11.7k
2
votes
Accepted
How and When are lightning channels disabled?
This is a tricky question as it tackles the difference between what the protocol supports and what implementations provider as an API.
On a protocol level channels are enabled / disabled via an ...
- 11.7k
2
votes
Closing address of a Lightning channel
Yes, it is possible!
In BOLT 2 you have a shutdown message that looks like this
type: 38 (shutdown)
data:
[channel_id:channel_id]
[u16:len]
[len*byte:scriptpubkey]
The scriptpubkey does the trick. ...
- 1,323
1
vote
What is the exact size and weight of a 2-of-2 P2WSH input?
TL;DR:
A 2-of-2 P2WSH input should be conservatively estimated with 96 vbytes. Standard 2-of-2 P2WSH inputs generally weigh 95.5, 95.75 or 96.0 vbytes, depending on whether the r-values in the ...
- 71.6k
Only top scored, non community-wiki answers of a minimum length are eligible