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19_3_Closing_a_Channel.md
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# 19.3: Closing a Channel # 19.3: Closing a Channel
> :information_source: **NOTE:** This is a draft in progress, so that I can get some feedback from early reviewers. It is not yet ready for learning. > :information_source: **NOTE:** This section has been recently added to the course and is an early draft that may still be awaiting review. Caveat reader.
In this chapter you'll learn how to close a channel using `lightning-cli close` command-line interface. Closing a channel means you and your counterparty will send their agreed-upon channel balance to the blockchain, whereby you must pay blockchain transaction fees and wait for the transaction to be mined. A closure can be cooperative or non-cooperative, but it works either way. In this chapter you'll learn how to close a channel using `lightning-cli close` command-line interface. Closing a channel means you and your counterparty will send their agreed-upon channel balance to the blockchain, whereby you must pay blockchain transaction fees and wait for the transaction to be mined. A closure can be cooperative or non-cooperative, but it works either way.
In order to close a channel, you first need to know the ID of the remote node; you can retrieve it in one of two ways. In order to close a channel, you first need to know the ID of the remote node; you can retrieve it in one of two ways.
## Finding your Channels by Funds ## Find your Channels by Funds
You can use the `lightning-cli listfunds` command to see your channels. This RPC command displays all funds available, either in unspent `outputs` (UTXOs) in the internal wallet or locked up in currently open `channels`. You can use the `lightning-cli listfunds` command to see your channels. This RPC command displays all funds available, either in unspent `outputs` (UTXOs) in the internal wallet or locked up in currently open `channels`.
``` ```
@ -60,7 +60,7 @@ You could retrieve the ID of the 0th channel into a variable like this:
c$ nodeidremote=$(lightning-cli --testnet listfunds | jq '.channels[0] | .peer_id') c$ nodeidremote=$(lightning-cli --testnet listfunds | jq '.channels[0] | .peer_id')
``` ```
## Finding your Channels with JQ ## Find your Channels with JQ
The other way to find channels to close is to the use the `listchannels` command. It returns data on channels that are known to the node. Because channels may be bidirectional, up to two nodes will be returned for each channel (one for each direction). The other way to find channels to close is to the use the `listchannels` command. It returns data on channels that are known to the node. Because channels may be bidirectional, up to two nodes will be returned for each channel (one for each direction).
@ -102,7 +102,7 @@ Once you know what you've got, you can store it in a variable:
c$ nodeidremote=$(lightning-cli --testnet listchannels | jq '.channels[] | select(.source == '$nodeid' or .destination == '$nodeid') | .destination') c$ nodeidremote=$(lightning-cli --testnet listchannels | jq '.channels[] | select(.source == '$nodeid' or .destination == '$nodeid') | .destination')
``` ```
## Closing a Channel ## Close a Channel
Now that you have a remote node ID, you're ready to use the `lightning-cli close` command to close a channel. By default, it will attempt to close the channel cooperatively with the peer; if you want to close it unilaterally set the `unilateraltimeout` argument with the number of seconds to wait. (If you set it to 0 and the peer is online, a mutual close is still attempted.) For this example, you will attempt a mutual close. Now that you have a remote node ID, you're ready to use the `lightning-cli close` command to close a channel. By default, it will attempt to close the channel cooperatively with the peer; if you want to close it unilaterally set the `unilateraltimeout` argument with the number of seconds to wait. (If you set it to 0 and the peer is online, a mutual close is still attempted.) For this example, you will attempt a mutual close.
@ -227,7 +227,7 @@ $ lightning-cli --network=testnet listfunds
``` ```
### Understanding the Types of Closing Channels. ### Understand the Types of Closing Channels.
The `close` RPC command attempts to close a channel cooperatively with its peer or unilaterally after the `unilateraltimeout` argument expires. This bears some additional discussion, as it goes to the heart of Lightning's trustless design: The `close` RPC command attempts to close a channel cooperatively with its peer or unilaterally after the `unilateraltimeout` argument expires. This bears some additional discussion, as it goes to the heart of Lightning's trustless design: