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+# %btc-provider full node on Docker
+
+[Github](https://github.com/wexpertsystems/urbit-bitcoin-node)
+
+Urbits communicate with the Bitcoin blockchain via providers, who themselves are connected to full nodes running a few pieces of extra software. This stack can be a little complicated to set up on your own -- using this Docker container should simplify setup and scaling. 
+
+We'll go through the full setup process, from installing Docker to connecting your provider.
+
+To begin with, you will need **at least** 600GB of disk space available. This setup requires the full blockchain, plus additional space for indexing. Once you have a disk available, make note of its path; you might just use your home directory if if you are running this on a spare PC, or it may be somewhere like `/media/<label>` or `/mnt/<label>` for a mounted drive.
+
+## Under the hood
+
+You can take a look at the pieces involved here by looking at `~timluc-miptev`'s [urbit-bitcoin-rpc](https://github.com/urbit/urbit-bitcoin-rpc) repo; this container is just a prepackaged version of the software therein. Inside there is `bitcoind`, the Bitcoin daemon; `electrs`, a Rustlang reimplementation of the Electrum RPC server; and a custom Node Express server to translate the RPC calls to and from HTTP.
+
+Once it's set up, the chain of communication looks like this:
+
+```
+<Docker>
+  [bitcoind]
+  [electrs]
+  [express]
+         ^
+         |
+         v
+<Moon>
+  [%btc-provider]
+         ^
+         |
+         v
+<Planet>
+  [%btc-wallet]
+```
+
+## Install Docker
+
+On Ubuntu, install the dependencies and repos:
+
+```
+$> sudo apt-get update
+$> sudo apt-get install ca-certificates curl gnupg lsb-release
+$> curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
+$> echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
+```
+
+Then install Docker:
+
+```
+$> sudo apt-get update
+$> sudo apt-get install docker-ce docker-ce-cli containerd.io
+$> sudo groupadd docker && sudo usermod -aG docker $USER
+```
+
+## Running the container
+
+Now you can run the container:
+
+```
+docker run -d --name urbit-bitcoin-node -v /mnt/bitcoin/bitcoin_data:/bitcoin/data -p 127.0.0.1:8332:8332 -p 8333:8333 -p 50002:50002 wexpertsystems/urbit-bitcoin-node
+```
+
+A few notes here: 
+
+- `/mnt/bitcoin/bitcoin_data` is a placeholder path -- replace it with whatever path you want to hold the blockchain in. Remember that it needs at least 500GB of free space.
+- `8333` is the `bitcoind` p2p port; `50002` is the RPC port. These ports are exposed on the host machine's network interface, so you can reach them from other devices.
+- Once you start running the container, it will **probably take about two days** for the blockchain to finish syncing and indexing. You can check on its progress by watching the terminal output. 
+
+Once the blockchain has synced, you can test the RPC manually using `curl`: 
+
+```
+$> curl http://ip.address.here:50002/addresses/info/bc1qm7cegwfd0pvv9ypvz5nhstage00xkxevtrpshc
+```
+
+...which should return a JSON blob.
+
+## TLS reverse proxy
+
+By default, our RPC server is serving requests publicly over unencrypted HTTP. Let's put a restricted reverse proxy with TLS on it -- this is very simple with a tool called [Caddy](https://caddyserver.com/).
+ 
+First, install the repo:
+
+```
+$> sudo apt install -y debian-keyring debian-archive-keyring apt-transport-https
+$> curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/cfg/gpg/gpg.155B6D79CA56EA34.key' | sudo apt-key add -
+$> curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/cfg/setup/config.deb.txt?distro=debian&version=any-version' | sudo tee -a /etc/apt/sources.list.d/caddy-stable.list
+```
+
+Then install Caddy, and give it well-known port privileges: 
+
+```
+$> sudo apt update && sudo apt install caddy
+$> sudo setcap 'cap_net_bind_service=+ep' /usr/bin/caddy
+```
+ 
+Now you'll need to create a config file. Open `/etc/caddy/Caddyfile` in a text editor. Here is a simple config that includes IP address whitelisting to prevent public use of the node:
+
+```
+bitcoin.domain.com {
+@node {
+remote_ip forwarded 172.17.0.0/24 1.2.3.4
+}
+handle @node {
+reverse_proxy 172.17.0.1:50002
+}
+respond "Bad IP" 403
+}
+```
+
+In this configuration, `bitcoin.domain.com` is your full node's dedicated subdomain, `1.2.3.4` is the public IP address of any external device that needs to access the node, and `172.17.0.0/24` whitelists the private IP range of your Docker interfaces, in case you're running a ship in a container. `172.17.0.1` is the private IP of your node's container -- you can find it with `ip a`, and looking for the interface named `docker0`.
+
+Save this file, and `caddy start`. You should be able to curl your domain with HTTPS:
+
+```
+$> curl https://bitcoin.domain.com/addresses/info/bc1qm7cegwfd0pvv9ypvz5nhstage00xkxevtrpshc
+```
+
+## Setting up %btc-provider
+
+You are strongly encouraged to **run `%btc-provider` on a moon**! This service can be taxing on ships, and it is good to separate that from the day-to-day tasks your personal planet or star might need to perform.
+
+All ships come with `%btc-provider` pre-installed. Once you have booted a moon, run the folllowing commands in the dojo:
+
+```
+dojo> |rein %bitcoin [& %btc-provider]
+dojo> =network %main
+dojo> :btc-provider +bitcoin!btc-provider/command [%set-credentials api-url='https://addresshere' network]
+```
+
+Modify the node's address as necessary; if you are not using a TLS reverse proxy, change the URL to use `http`.
+
+Your provider ship will grind for a few moments, then give you a new block announcement in the dojo:
+
+```
+"%new-block: 706.085"
+```
+
+Now you can whitelist clients to allow them to connect to you as a provider. For your child points:
+
+```
+dojo> :btc-provider +bitcoin!btc-provider/command [%add-whitelist %kids ~]
+```
+
+For all members of a group:
+
+```
+dojo> :btc-provider +bitcoin!btc-provider/command [%groups groups=(sy ~[[~sampel %group-name]])]]
+```
+
+For a specific `@p`:
+
+```
+dojo> :btc-provider +bitcoin!btc-provider/command [%users users=(sy ~[~wallet-hodler])]]
+```
+
+To allow public use/global whitelist:
+
+```
+dojo> :btc-provider +bitcoin!btc-provider/command [%add-whitelist %public ~]
+```