README.md

RGB Node

This is source for daemon executables and library that can run RGB backend. For wallet and exchange integration please check an interface to it and demo projects from RGB SDK.

This repository contains RGB node source code and SDK for wallet & server-side development.

The node may run as a set of daemons (even in different docker containers); a multi-threaded single process or as a set of managed threads within a wallet app.

For an easy test setup that allows to experience the node's capabilities, you can check out the demo.

Design

The node (as other nodes maitained by LNP/BP Standards Association and Pandora Core company subsidiaries) consists of multiple microservices, communicating with each other via LNP ZMQ RPC interface.

Node architecture

The set of microservices representing node can run as either:

1. single daemon process on desktop or a server;
2. cloud of docker-based daemons, one per microservice, with instance scalability and in geo-distributed environment;
3. inside a single mobile app as threads;
4. and even different nodes can be combined in their services between themselves into a single executables/mobile apps;
5. all P2P communications are end-to-end encrypted and work over Tor.

Other nodes, designed an maintained by LNP/BP Standards Association with the same architecture include:

• LNP Node for running Lightning Network Protocol (LNP) and Generalized Lightning Channels (GLC).
• BP Node for indexing bitcoin blockchain (you may think of it as a more efficient Electrum server alternative)
• Bifrost – node for storing/passing client-side-validated data with watchtower functionality and used for Storm/RGB/DEX infrastructure

Other third parties provide their own nodes designed with the same architecture, for instance:

• Keyring for managing private key accounts, storage and signatures with support for miniscript and PSBTs

Project organization & architecture

• src/api/ – LNP messages for all daemons used for message bus
• src/bin/ – binaries for daemons & CLI launching main process
• src/cli/ – CLAP-based command line API talking to message bus
• src/i8n/ – functions exposed to FFI talking to message bus
• src/<name>/ – service/daemon-specific code:
  • src/stash/ – daemon managing RGB stash data and its storage; you may configure it (with either config file, environment vars or command-line arguments) to use different forms of storage drivers;
  • src/contracts – daemons supporting high-level APIs for working with different forms of RGB Schema: RGB-20 (fungible assets), RGB-21 (collectionables/NFTs) etc;
  • src/rgbd – daemon orchestrating bootstrapping of stash and contracts daemons

Each daemon (more correctly "microservice", as it can run as a thread, not necessary a process) or other binary (like CLI tool) follows the same organization concept for module/file names:

• error.rs – daemon-specific error types;
• config.rs – CLAP arguments & daemon configuration data;
• runtime.rs – singleton managing main daemon thread and keeping all ZMQ/P2P connections and sockets; receiving and processing messages through them;
• processor.rs – business logic functions & internal state management which does not depend on external communications/RPC;
• index/, storage/, cache/ – storage interfaces and engines;
• db/ – SQL-specific schema and code, if needed.

Install

Minimum supported rust compiler version (MSRV): 1.45

Local

To compile the node, please install cargo, then run the following commands:

Linux

sudo apt update
sudo apt install -y build-essential cmake libpq-dev libsqlite3-dev libssl-dev libzmq3-dev pkg-config

MacOS

brew install cmake libpq sqlite pkg-config openssl zmq

Both

git clone https://github.com/LNP-BP/rgb-node.git
cd rgb-node
cargo build --release --bins --features all

Now, to run the node you can execute

target/release/rgbd --data-dir ~/.rgb --bin-dir target/release -vvvv --contract fungible

In docker

In order to build and run a docker image of the node, run:

docker build -t rgb-node .
docker run --rm --name rgb_node rgb-node

Using

First, you need to start daemons: rgbd -vvvv -d <data_dir> -b <bin_dir>, --contract fungible where bin_dir is a directory with all daemons binaries (usually target/release from repo source after cargo build --release --bins --features all command).

Issuing token: rgb-cli -d <data_dir> -vvvv fungible issue TCKN "SomeToken" <supply>@<txid>:<vout>

Next, list your tokens rgb-cli -d <data_dir> -vvvv fungible list

Do an invoice rgb-cli -d <data_dir> -vvvv fungible invoice <contract_id> <amount> <txid>:<vout>, where <contract_id> is id of your token returned by the last call, and <txid>:<vout> must be a transaction output you are controlling.

Save the value of the binding factor you will receive: it will be required in the future to accept the transfer. Do not share it! Send the invoice string to the payee.

Doing transfer: this requires preparation of PSBT; here we use ones from our sample directory rgb-cli -d <data_dir> -vvvv fungible transfer "<invoice>" test/source_tx.psbt <consignment_file> test/dest_tx.psbt -i <input_utxo> [-a <amount>@<change_utxo>] NB: input amount must be equal to the sum of invoice amount and change amounts.

This will produce consignment. Send it to the receiving party.

The receiving party must do the following: rgb-cli -d <data_dir> -vvvv fungible accept <consignment_file> <utxo>:<vout> <blinding>, where utxo and the blinding must be values used in invoice generation

Developer guidelines

In order to update the project dependencies, run cargo update. If any dependency updates, the Cargo.lock file will be updated, keeping track of the exact package version.

After an update, run tests (cargo test) and manually test the software in order to stimulate function calls from updated libraries.

Please check software using RGB Node for integration examples.

If any problem arises, open an issue.

Software using RGB Node

• Bitcoin Pro: tool for RGB asset issue & management for asset by the issuers
• MyCitadel Bitcoin, LN & RGB enabled wallet service with support for other LNP/BP protocols