# Running Bitcoin Cash servers (BCHN, Fulcrum)

# BCHN on Ubuntu

Create a directory for the data, let's say: /mnt/bchn (and for example /mnt/fulcrum for Fulcrum)

The space requirements as of February 2021:

182G    /mnt/bchn
36G     /mnt/fulcrum

# Remove Bitcoin ABC if it was running

sudo apt-get remove bitcoind bitcoin-qt bitcoin-tx
sudo add-apt-repository --remove ppa:bitcoin-abc/ppa

# Install Bitcoin Cash Node

# Run this on Ubuntu 16.04 and 18.04 only:

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install g++-7

Install the node:

sudo apt-get install software-properties-common
sudo add-apt-repository ppa:bitcoin-cash-node/ppa
sudo apt-get update
sudo apt-get install bitcoind

# Start Bitcoin Cash Node

mkdir -p /mnt/bchn
bitcoind -datadir=/mnt/bchn -rpcallowip=127.0.0.1 \
    -rpcbind=127.0.0.1:8332 -rpcuser=rpc \
    -txindex=1 \
    -rpcpassword=RANDOMPASSWORD

Replace the password with something random (try head /dev/urandom | tr -dc A-Za-z0-9 | head -c 32 ; echo '' on Linux)

To open your RPC for other computers on the Internet (not recommended, even if password protected):

bitcoind -datadir=/mnt/bchn -rpcallowip=0.0.0.0/0 \
    -rpcbind=0.0.0.0:8332 -rpcuser=rpc \
    -txindex=1 \
    -rpcpassword=RANDOMPASSWORD

# Running Fulcrum (Electron Cash compatible server)

Generate an SSL certificate (needed for the protocol, self-signed is sufficient, enter any values you'd like):

openssl req -newkey rsa:4096 \
    -x509 -sha256  -days 3650  -nodes \
    -out /var/www/tls/fulcrum-certificate.pem \
    -keyout /var/www/tls/fulcrum-key.pem

Install Fulcrum (replace 1.5.2 with the latest (opens new window) version)

wget https://github.com/cculianu/Fulcrum/releases/download/v1.5.2/Fulcrum-1.5.2-x86_64-linux.tar.gz
tar zxvf Fulcrum-1.5.2-x86_64-linux.tar.gz
rm Fulcrum-1.5.2-x86_64-linux.tar.gz
cd Fulcrum-1.5.2-x86_64-linux

mkdir -p /mnt/fulcrum
./Fulcrum --datadir=/mnt/fulcrum \
  --bitcoind=127.0.0.1:8332 --rpcuser=rpc \
  --ssl=0.0.0.0:50002 \
  --cert=/var/www/tls/fulcrum-certificate.pem \
  --key=/var/www/tls/fulcrum-key.pem \
  --rpcpassword=RANDOMPASSWORD

# WebSocket port for mainnet library

To be able to connect to this Fulcrum from mainnet library, you need to enable WebSocket port (50004) and get a valid certificate. First assign a domain name to your IP address (buy one, usually there's a domain name manager, add an A entry). Let's say your domain name is fulcrum.test.cash

sudo apt-get install -y certbot
certbot certonly --manual --preferred-challenges dns -d fulcrum.test.cash

Follow the instructions of certbot.

Now run:

./Fulcrum --datadir=/mnt/fulcrum \
  --bitcoind=127.0.0.1:8332 --rpcuser=rpc \
  --ssl=0.0.0.0:50002 \
  --cert=/var/www/tls/fulcrum-certificate.pem \
  --key=/var/www/tls/fulcrum-key.pem \
  --rpcpassword=RANDOMPASSWORD \
  --wss=0.0.0.0:50004 \
  --wss-cert=/etc/letsencrypt/live/fulcrum.test.cash/fullchain.pem \ 
  --wss-key=/etc/letsencrypt/live/fulcrum.test.cash/privkey.pem

Remember to replace fulcrum.test.cash with your domain name and RANDOMPASSWORD with an actual password.

Now you can setup your REST server:

docker run --env ELECTRUM="wss://fulcrum.test.cash:50004" -p 127.0.0.1:3000:80 \
   mainnet/mainnet-rest:latest

Your REST server will be available at http://127.0.0.1:3000 connected to your own Fulcrum instance

See here for more options (including LetsEncrypt certificate for your REST server)

# Running Insomnia (REST server to serve Fulcrum results)

git clone https://github.com/fountainhead-cash/insomnia.git
cd insomnia
npm install

Edit the config file

cp src/config.ts.example src/config.ts
$(EDITOR) src/config.ts
npm start