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[![Coverage Status](https://coveralls.io/repos/github/lightningnetwork/lnd/badge.svg?branch=master)](https://coveralls.io/github/lightningnetwork/lnd?branch=master)
The Lightning Network Daemon (`lnd`) - is a complete implementation of a
[Lightning Network](https://lightning.network) node and currently
deployed on `testnet4` - the Bitcoin Test Network. It utilizes an
upcoming upgrade to Bitcoin: Segregated Witness (`segwit`). The
project's codebase uses the [btcsuite](https://github.com/btcsuite/) set
of Bitcoin libraries, and is currently dependant on [btcd](https://github.com/btcsuite/btcd).
In the current state `lnd` is capable of:
* creating channels
* closing channels
* completely managing all channel states (including the exceptional ones!)
* maintaining a fully authenticated+validated channel graph
* performing path finding within the network, passively forwarding
incoming payments
* sending outgoing [onion-encrypted payments](https://github.com/lightningnetwork/lightning-onion)
through the network
[Lightning Network](https://lightning.network) node and currently deployed on
`testnet3` - the Bitcoin Test Network. `lnd` has several pluggable back-end
chain services including [`btcd`](https://github.com/btcsuite/btcd) (a
full-node) and [`neutrino`](https://github.com/lightninglabs/neutrino) (a new
experimental light client). The project's codebase uses the
[btcsuite](https://github.com/btcsuite/) set of Bitcoin libraries, and also
exports a large set of isolated re-usable Lightning Network related libraries
within it. In the current state `lnd` is capable of:
* Creating channels.
* Closing channels.
* Completely managing all channel states (including the exceptional ones!).
* Maintaining a fully authenticated+validated channel graph.
* Performing path finding within the network, passively forwarding incoming payments.
* Sending outgoing [onion-encrypted payments](https://github.com/lightningnetwork/lightning-onion)
through the network.
* Updating advertised fee schedules.
* Automatic channel management ([`autopilot`](https://github.com/lightningnetwork/lnd/tree/master/autopilot)).
## Lightning Network Specification Compliance
`lnd` doesn't yet _fully_ conform to the [Lightning Network specification
(BOLTs)](https://github.com/lightningnetwork/lightning-rfc). BOLT stands
for: Basic of Lightning Technologies. The specifications are currently being drafted
(BOLTs)](https://github.com/lightningnetwork/lightning-rfc). BOLT stands for:
Basic of Lightning Technologies. The specifications are currently being drafted
by several groups of implementers based around the world including the
developers of `lnd`. The set of specification documents as well as our
implementation of the specification are still a work-in-progress. With that
said, `lnd` the current status of `lnd`'s BOLT compliance is:
- [ ] BOLT 1: Base Protocol
* `lnd` currently utilizes a distinct wire format which was created
before the emgergence of the current draft of BOLT specifications.
We don't have an `init` message, but we do have analogues to all
the other defined message types.
- [X] BOLT 1: Base Protocol
- [ ] BOLT 2: Peer Protocol for Channel Management
* `lnd` implements all the functionality defined within the
document, however we currently use a different set of wire messages.
Additionally,`lnd` uses a distinct commitment update state-machine
and doesn't yet support dynamically updating commitment fees.
- [ ] BOLT 3: Bitcoin Transaction and Script Formats
* `lnd` currently uses a commitment design from a prior iteration
of the protocol. Revocation secret generation is handled by `elkrem`
and our scripts are slightly different.
* `lnd` has not yet integrated full channel re-transmission upon
reconnection
- [X] BOLT 3: Bitcoin Transaction and Script Formats
- [X] BOLT 4: Onion Routing Protocol
- [X] BOLT 5: Recommendations for On-chain Transaction Handling
- [X] BOLT 7: P2P Node and Channel Discovery
- [X] BOLT 8: Encrypted and Authenticated Transport
## Developer Resources
The daemon has been designed to be as developer friendly as possible in order
to facilitate application development on top of `lnd`. To primary RPC
interfaces are exported: an HTTP REST API, and a [gRPC](https://grpc.io/)
service. The exported API's are not yet stable, so be warned: they may change
drastically in the near future.
An automatically generated set of documentation for the RPC API's can be found
at [api.lightning.community](api.lightning.community). A set of developer
resources including talks, articles, and example applications can be found at:
[dev.lightning.community](dev.lightning.community).
Finally, we also have an active
[Slack](https://join.slack.com/t/lightningcommunity/shared_invite/MjI4OTg3MzQ4MjI2LTE1MDMxNzM1NTMtNjlmOGYzOTI1Ng)
where protocol developers, application developers, testers and users gather to
discuss various aspects of `lnd` and also Lightning in general.
## Installation
In order to build from source, please see [the installation
instructions](docs/INSTALL.md).