William Casarin
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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, #c-lightning @ 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
(version 0.15 or above) 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 build-essential git libtool libgmp-dev libsqlite3-dev python3 net-tools
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:latest
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
Wait until bitcoind
has synchronized with the testnet network. In case you use regtest, make sure you generate at least 432 blocks to activate SegWit.
Make sure that you do not have walletbroadcast=0
in your
~/.bitcoin/bitcoin.conf
, or you may run into trouble.
You can start lightningd
with the following command:
lightningd/lightningd --network=testnet --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>
cli/lightning-cli newaddr
# Returns a transaction id <txid>
bitcoin-cli -testnet sendtoaddress <address> <amount>
lightningd
will register the funds once the transaction is
confirmed.
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.
You can send it directly to the lightningd
address.
Confirm lightningd
got funds by:
# Returns an array of on-chain funds.
cli/lightning-cli listfunds
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>
(and optional <port>
, if not 9735) and has the node ID
<node_id>
:
cli/lightning-cli connect <node_id> <ip> [<port>]
cli/lightning-cli fundchannel <node_id> <amount>
This opens a connection and, on top of that connection, then opens a channel.
The funding transaction needs 1 confirmations in order for the channel to be usable, and 6 to be broadcast for others to use.
You can check the status of the channel using cli/lightning-cli getpeers
, which after 1 confirmation should say that state
is CHANNELD_NORMAL
; after 6 confirmations you can use cli/lightning-cli getchannels
to verify that the public
field is now true
.
Receiving and receiving payments
Payments in Lightning are invoice based.
The recipient creates an invoice with the expected <amount>
in millisatoshi (or "any"
for a donation), a unique <label>
and a <description>
the payer will see:
cli/lightning-cli invoice <amount> <label> <description>
This returns some internal details, and a standard invoice string called bolt11
(named after the BOLT #11 lightning spec.
The sender can feed this bolt11
string to the decodepay
command to see what it is, and pay it simply using the pay
command:
cli/lightning-cli pay <bolt11>
Note that there are lower-level interfaces (and more options to these interfaces) for more sophisticated 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 cli/lightning-cli
tool, or the python API client.