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joininbox/prepare_remote_node.md

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Prepare a remote node to accept the JoinMarket connection

JoinMarket (running in JoinInBox) needs to connect to Bitcoin Core.
A pruned node with the wallet enabled will do and txindex is not required.
This guide shows how to prepare a RaspiBlitz to accept this connection.

LAN connection

In the terminal of the node - allow remote RPC connections to Bitcoin Core
This can be skipped if you connect through Tor

  1. Edit the bitcoin.conf
    $ sudo nano /mnt/hdd/bitcoin/bitcoin.conf

    Add the values:
    (edit to your local subnet - the first 3 numbes of the LAN IP address, the example used here is: 192.168.1)
    (can keep the other rpcallowip and rpcbind entires especially for the localhost: 127.0.0.1)

    rpcallowip=192.168.1.0/24
rpcbind=0.0.0.0

  2. Restart Bitcoin Core

    $ sudo systemctl restart bitcoind

  3. Open the firewall to allow the RPC connection from LAN

    (edit to your local subnet):
    sudo ufw allow from 192.168.1.0/24 to any port 8332
    ufw enable

  4. Take note of the LAN_ADDRESS of the remote node and fill it in to the rpc_host in joinmarket.cfg

Tor connection

On the node - activate Tor and create a Hidden Service

Make sure that Tor is installed or active in the SERVICES menu

Create a Hidden Service to forward the bitcoin RPC port

  1. On the RaspiBlitz since v1.4 there is a script to create a hidden service:
    ./config.scripts/internet.hiddenservice.sh bitcoinrpc 8332 8332

  2. Take note of the Tor_Hidden_Service.onion and fill in to the rpc_host in the joinmarket.cfg

Alternatively proceed manually:

  1. Open the Tor configuration file
    $ sudo nano /etc/tor/torrc

  2. Insert the lines

    # Hidden Service v3 for bitcoinrpc
HiddenServiceDir /mnt/hdd/tor/bitcoinrpc
HiddenServiceVersion 3
HiddenServicePort 8332 127.0.0.1:8332

  3. Restart Tor

    $ sudo systemctl restart tor

  4. Take note of the Tor_Hidden_Service.onion

    $ sudo cat /mnt/hdd/tor/bitcoinrpc/hostname

  5. Fill in the Tor_Hidden_Service.onion to the rpc_host in the joinmarket.cfg

Remember to use torify with the python scripts when connecting remotely through Tor - applied automatically in the JoininBox

Example:
torify wallet-tool.py wallet.jmdat

also need to allow Tor to connect to localhost

Resources: