Rusty Russell
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README.md
c-lightning: A specification compliant Lightning Network implementation in C
c-lightning is a standard compliant implementation of the Lightning Network protocol. The Lightning Network is a scalability solution for Bitcoin, enabling secure and instant transfer of funds between any two party for any amount.
For more information about the Lightning Network please refer to http://lightning.network.
Project Status
This implementation is still very much work in progress, and, although it can be used for testing, it should not be used for real funds. We do our best to identify and fix problems, and implement missing feature.
Any help testing the implementation, reporting bugs, or helping with outstanding issues is very welcome. Don't hesitate to reach out to us on IRC at #lightning-dev @ freenode.net or on the mailing list lightning-dev@lists.linuxfoundation.org.
Getting Started
c-lightning currently only works on Linux (and possibly Mac OS with some tweaking), and requires a locally running bitcoind
that is fully caught up with the network you're testing on.
Installation
Please refer to the installation documentation for detailed instructions. For the impatient here's the gist of it for Ubuntu and Debian:
sudo apt-get install -y autoconf git build-essential libtool libprotobuf-c-dev libgmp-dev libsqlite3-dev python python3
git clone https://github.com/ElementsProject/lightning.git
cd lightning
make
Or if you like to throw docker
into the mix:
sudo docker run \
-v $HOME/.lightning:/root/.lightning \
-v $HOME/.bitcoin:/root/.bitcoin \
-p 9735:9735 \
/cdecker/lightningd:master
Starting lightningd
In order to start lightningd
you will need to have a local bitcoind
node running in either testnet or regtest mode:
bitcoind -daemon -testnet
Once bitcoind
has synchronized with the testnet/regtest network, you can start lightningd
with the following command:
lightningd/lightningd --log-level=debug
Opening a channel on the Bitcoin testnet
First you need to transfer some funds to lightningd
so that it can open a channel:
# Returns an address <address>
daemon/lightgning-cli newaddr
# Returns a transaction id <txid>
bitcoin-cli -testnet sendtoaddress <address> <amount>
# Retrieves the raw transaction <rawtx>
bitcoin-cli -testnet getrawtransaction <txid>
# Notifies `lightningd` that there are now funds available:
daemon/lightning-cli addfunds <rawtx>
Eventually lightningd
will include its own wallet making this transfer easier, but for now this is how it gets its funds.
If you don't have any testcoins you can get a few from a faucet such as TPs' testnet faucet or Kiwi's testnet faucet.
Once lightningd
has funds, we can connect to a node and open a channel.
Let's assume the remote node is accepting connections at <ip>:<port>
and has the node ID <node_id>
:
daemon/lightning-cli connect <ip> <port> <node_id>
daemon/lightning-cli fundchannel <node_id> <amount>
This opens a connection and, on top of that connection, then opens a channel.
You can check the status of the channel using daemon/lightning-cli getpeers
.
The funding transaction needs to confirm in order for the channel to be usable, so wait a few minutes, and once that is complete it getpeers
should say that the status is in Normal operation.
Receiving and receiving payments
Payments in Lightning are invoice based.
The recipient creates an invoice with the expected <amount>
in millisatoshi and a <label>
:
daemon/lightning-cli invoice <amount> <label>
This returns a random value called rhash
that is part of the invoice.
The recipient needs to communicate its ID <recipient_id>
, <rhash>
and the desired <amount>
to the sender.
The sender needs to compute a route to the recipient, and use that route to actually send the payment:
route=$(daemon/lightning-cli getroute <recipient_id> <amount> 1 | jq --raw-output .route -)
daemon/lightning-cli sendpay $route <amount>
Notice that in the first step we stored the route in a variable and reused it in the second step.
lightning-cli
should return a preimage that serves as a receipt, confirming that the payment was successful.
This low-level interface is still experimental and will eventually be complemented with a higher level interface that is easier to use.
Further information
JSON-RPC interface is documented in the following manual pages:
For simple access to the JSON-RPC interface you can use the daemon/lightning-cli
tool, or the python API client.