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# Channel tools
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## Index
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* [Installation](#installation)
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* [Overview](#overview)
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* [Commands](#commands)
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+ [dumpbackup](#dumpbackup)
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+ [dumpchannels](#dumpchannels)
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+ [forceclose](#forceclose)
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+ [rescueclosed](#rescueclosed)
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+ [showrootkey](#showrootkey)
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+ [summary](#summary)
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+ [sweeptimelock](#sweeptimelock)
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This tool provides helper functions that can be used to rescue funds locked in
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lnd channels in case lnd itself cannot run properly any more.
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**WARNING**: This tool was specifically built for a certain rescue operation and
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might not be well-suited for your use case. Or not all edge cases for your needs
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are coded properly. Please look at the code to understand what it does before
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you use it for anything serious.
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**WARNING 2**: This tool will query public block explorer APIs, your privacy
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might not be preserved. Use at your own risk.
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## Installation
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To install this tool, make sure you have `go 1.13.x` (or later) and `make`
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installed and run the following command:
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```bash
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make install
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```
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## Overview
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```text
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Usage:
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chantools [OPTIONS] <command>
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Application Options:
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--testnet Set to true if testnet parameters should be used.
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--apiurl= API URL to use (must be esplora compatible). (default: https://blockstream.info/api)
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--listchannels= The channel input is in the format of lncli's listchannels format. Specify '-' to read from stdin.
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--pendingchannels= The channel input is in the format of lncli's pendingchannels format. Specify '-' to read from stdin.
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--fromsummary= The channel input is in the format of this tool's channel summary. Specify '-' to read from stdin.
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--fromchanneldb= The channel input is in the format of an lnd channel.db file.
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Help Options:
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-h, --help Show this help message
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Available commands:
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dumpbackup Dump the content of a channel.backup file.
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dumpchannels Dump all channel information from lnd's channel database.
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forceclose Force-close the last state that is in the channel.db provided.
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rescueclosed Try finding the private keys for funds that are in outputs of remotely force-closed channels.
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showrootkey Extract and show the BIP32 HD root key from the 24 word lnd aezeed.
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summary Compile a summary about the current state of channels.
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sweeptimelock Sweep the force-closed state after the time lock has expired.
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```
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## Commands
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### dumpbackup
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```text
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Usage:
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chantools [OPTIONS] dumpbackup [dumpbackup-OPTIONS]
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[dumpbackup command options]
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--rootkey= BIP32 HD root key of the wallet that was used to create the backup.
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--multi_file= The lnd channel.backup file to dump.
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```
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This command dumps all information that is inside a `channel.backup` file in a
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human readable format.
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Example command:
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```bash
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chantools dumpbackup --rootkey xprvxxxxxxxxxx \
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--multi_file ~/.lnd/data/chain/bitcoin/mainnet/channel.backup
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```
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### dumpchannels
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```text
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Usage:
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chantools [OPTIONS] dumpchannels [dumpchannels-OPTIONS]
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[dumpchannels command options]
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--channeldb= The lnd channel.db file to dump the channels from.
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```
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This command dumps all open and pending channels from the given lnd `channel.db`
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file in a human readable format.
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Example command:
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```bash
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chantools dumpchannels --channeldb ~/.lnd/data/graph/mainnet/channel.db
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```
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### forceclose
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```text
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Usage:
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chantools [OPTIONS] forceclose [forceclose-OPTIONS]
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[forceclose command options]
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--rootkey= BIP32 HD root key to use.
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--channeldb= The lnd channel.db file to use for force-closing channels.
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--publish Should the force-closing TX be published to the chain API?
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```
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If you are certain that a node is offline for good (AFTER you've tried SCB!) and
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a channel is still open, you can use this method to force-close your latest
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state that you have in your channel.db.
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**!!! WARNING !!! DANGER !!! WARNING !!!**
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If you do this and the state that you publish is *not* the latest state, then
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the remote node *could* punish you by taking the whole channel amount *if* they
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come online before you can sweep the funds from the time locked (144 - 2000
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blocks) transaction *or* they have a watch tower looking out for them.
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**This should absolutely be the last resort and you have been warned!**
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Example command:
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```bash
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chantools --fromsummary results/summary-xxxx-yyyy.json \
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forceclose \
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--channeldb ~/.lnd/data/graph/mainnet/channel.db \
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--rootkey xprvxxxxxxxxxx \
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--publish
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```
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### rescueclosed
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```text
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Usage:
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chantools [OPTIONS] rescueclosed [rescueclosed-OPTIONS]
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[rescueclosed command options]
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--rootkey= BIP32 HD root key to use.
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--channeldb= The lnd channel.db file to use for rescuing force-closed channels.
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```
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If channels have already been force-closed by the remote peer, this command
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tries to find the private keys to sweep the funds from the output that belongs
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to our side. This can only be used if we have a channel DB that contains the
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latest commit point. Normally you would use SCB to get the funds from those
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channels. But this method can help if the other node doesn't know about the
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channels any more but we still have the channel.db from the moment they
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force-closed.
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Example command:
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```bash
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chantools --fromsummary results/summary-xxxx-yyyy.json \
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rescueclosed \
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--channeldb ~/.lnd/data/graph/mainnet/channel.db \
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--rootkey xprvxxxxxxxxxx
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```
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### showrootkey
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This command converts the 24 word lnd aezeed phrase and password to the BIP32
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HD root key that is used as the `rootkey` parameter in other commands of this
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tool.
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Example command:
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```bash
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chantools showrootkey
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```
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### summary
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```text
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Usage:
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chantools [OPTIONS] summary
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```
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From a list of channels, find out what their state is by querying the funding
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transaction on a block explorer API.
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Example command 1:
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```bash
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lncli listchannels | chantools --listchannels - summary
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```
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Example command 2:
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```bash
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chantools --fromchanneldb ~/.lnd/data/graph/mainnet/channel.db
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```
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### sweeptimelock
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```text
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Usage:
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chantools [OPTIONS] sweeptimelock [sweeptimelock-OPTIONS]
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[sweeptimelock command options]
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--rootkey= BIP32 HD root key to use.
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--publish Should the sweep TX be published to the chain API?
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--sweepaddr= The address the funds should be sweeped to
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--maxcsvlimit= Maximum CSV limit to use. (default 2000)
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```
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Use this command to sweep the funds from channels that you force-closed with the
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`forceclose` command. You **MUST** use the result file that was created with the
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`forceclose` command, otherwise it won't work. You also have to wait until the
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highest time lock (can be up to 2000 blocks which is more than two weeks) of all
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the channels has passed. If you only want to sweep channels that have the
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default CSV limit of 1 day, you can set the `--maxcsvlimit` parameter to 144.
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Example command:
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```bash
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chantools --fromsummary results/forceclose-xxxx-yyyy.json \
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sweeptimelock
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--rootkey xprvxxxxxxxxxx \
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--publish \
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--sweepaddr bc1q.....
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```
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