Middleware runs by-default on Umbrel OS as a containerized service. It wraps Bitcoin Core's RPC and LND's gRPC, and exposes them via a RESTful API.
Umbrel OS's web dashboard uses middleware to interact with both Bitcoin and Lightning Network.
If you are looking to run Umbrel on your hardware, you do not need to run this service on it's own. Just download Umbrel OS and you're good to go.
Make sure a bitcoind and lnd instance is running and available on the same machine.
yarnSet the following environment variables directly or by placing them in .env file of project's root.
| Variable | Description | Default |
|---|---|---|
PORT |
Port where middleware should listen for requests | 3005 |
DEVICE_HOSTS |
Comma separated list of IPs or domain names to whitelist for CORS | http://umbrel.local |
BITCOIN_HOST |
IP or domain where bitcoind RPC is listening |
127.0.0.1 |
RPC_USER |
bitcoind RPC username |
|
RPC_PASSWORD |
bitcoind RPC password |
|
LND_HOST |
IP or domain where lnd RPC is listening |
127.0.0.1 |
TLS_FILE |
Path to lnd's TLS certificate |
/lnd/tls.cert |
LND_PORT |
Port where lnd RPC is listening |
10009 |
LND_NETWORK |
The chain bitcoind is running on (mainnet, testnet, regtest, simnet) |
mainnet |
LND_WALLET_PASSWORD |
The password for the LND wallet which will be automatically unlocked on boot | |
MACAROON_DIR |
Path to lnd's macaroon directory |
/lnd/data/chain/bitcoin/mainnet/ |
JWT_PUBLIC_KEY_FILE |
Path to the JWT public key created by umbrel-manager |
/jwt-public-key/jwt.pem |
yarn startYou can browse through the available API endpoints here.
Umbrel is still in an early stage and things are expected to break every now and then. We DO NOT recommend running it on the mainnet with real money just yet, unless you want to be really #reckless.
We welcome and appreciate new contributions!
If you're a developer looking to help but not sure where to begin, check out these issues that have specifically been marked as being friendly to new contributors.
If you're looking for a bigger challenge, before opening a pull request please create an issue or join our community chat to get feedback, discuss the best way to tackle the challenge, and to ensure that there's no duplication of work.
Umbrel Middleware is built upon the work done by Casa on its open-source API.
