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MiniBolt on Testnet

You can run your MiniBolt node on testnet to develop and experiment with new applications, without putting real money at risk. This bonus guide highlights all configuration changes compared to the main guide.

{% hint style="warning" %} Difficulty: Medium {% endhint %}

Introduction

Running a testnet node is a great way to get acquainted with the MiniBolt and the suite of Bitcoin-related software typical of these powerful setups. Moreover, testnet empowers users to tinker with the software and its many configurations without the threat of losing funds. Helping Bitcoiners run a full testnet setup is a goal worthy of the MiniBolt, and this page should provide you with the knowledge to get there.

The great news is that most of the MiniBolt guide can be used as-is. The small adjustments come in the form of changes to the config files and ports for testnet. You can follow the guide and replace the following configurations in the right places as you go.

{% hint style="info" %}

Advice:

For the moment, this guide will touch only the case of an only testnet mode situation, in the future, we will study adding the case of configuration to enable the parallel/simultaneous mode (mainnet+testnet in the same device) in an extra section in this guide.

The services mentioned in this guide are those that have been tested using testnet configuration and these worked fine. Later, in the next versions of this guide, we will go to adding other process to adapt other services to the testnet mode. {% endhint %}

Bitcoin

Bitcoin client: Bitcoin Core

nano /home/bitcoin/.bitcoin/bitcoin.conf
## Replace the parameter
startupnotify=chmod g+r /home/bitcoin/.bitcoin/testnet3/.cookie
## Add the parameter
testnet=1
  • When you finish the Running Bitcoin section, with the user admin provide read and execute permissions to the Bitcoin group for the testnet folder
sudo chmod g+rx /data/bitcoin/testnet3

{% hint style="warning" %} Attention: the step before is very important! to allow LND to access to the .cookie file and startup without problems {% endhint %}

{% hint style="success" %} The rest of the Bitcoin client guide is the same as the mainnet mode {% endhint %}

Electrum server: Fulcrum

Follow the complete Electrum server guide from the beginning, when you arrive at the "Configure Firewall" section:

Configure Firewall

  • Replace the next lines to 60001/60002 ports, to match with the Testnet mode
sudo ufw allow 60001/tcp comment 'allow Fulcrum Testnet TCP from anywhere'
sudo ufw allow 60002/tcp comment 'allow Fulcrum Testnet SSL from anywhere'
  • When you arrive at the "Data directory" section, on the _"Download the custom Fulcrum banner based on MiniBolt..." step, d_ownload the Fulcrum testnet banner instead of the mainnet banner

{% code overflow="wrap" %}

wget https://raw.githubusercontent.com/minibolt-guide/minibolt/main/resources/fulcrum-banner-testnet.txt

{% endcode %}

Configuration

  • In the next Configuration step, stay tuned to replace the next lines on the fulcrum.conf file, to match with the testnet mode
nano /data/fulcrum/fulcrum.conf
# Bitcoin Core settings
bitcoind = 127.0.0.1:18332
rpccookie = /data/bitcoin/testnet3/.cookie

# Fulcrum server general settings
ssl = 0.0.0.0:60002
tcp = 0.0.0.0:60001

# Banner
banner = /data/fulcrum/fulcrum-banner-testnet.txt

Remote access over Tor

sudo nano /etc/tor/torrc
  • Replace ports to 60001/60002 to match with testnet mode
############### This section is just for location-hidden services ###
# Hidden Service Fulcrum Testnet TCP & SSL
HiddenServiceDir /var/lib/tor/hidden_service_fulcrum_testnet_tcp_ssl/
HiddenServiceVersion 3
HiddenServicePoWDefensesEnabled 1
HiddenServicePort 60001 127.0.0.1:60001
HiddenServicePort 60002 127.0.0.1:60002
  • Reload the Tor configuration and get your connection addresses
sudo systemctl reload tor
sudo cat /var/lib/tor/hidden_service_fulcrum_testnet_tcp_ssl/hostname

Example of expected output:

> abcdefg..............xyz.onion

{% hint style="info" %} You should now be able to connect to your Fulcrum server remotely via Tor using your hostname and port 60001 (TCP) or 60002 (SSL) {% endhint %}

{% hint style="success" %} The rest of the Fulcrum guide is the same as the mainnet mode {% endhint %}

Blockchain Explorer: BTC RPC Explorer

  • Follow the complete guide from the beginning, when you arrive at the Configuration section, set the next lines with the next values instead of the existing ones for mainnet. Edit .env file
nano /home/btcrpcexplorer/btc-rpc-explorer/.env
BTCEXP_BITCOIND_PORT=18332
BTCEXP_BITCOIND_COOKIE=/data/bitcoin/testnet3/.cookie
BTCEXP_ELECTRUM_SERVERS=tcp://127.0.0.1:60001

{% hint style="success" %} The rest of the BTC RPC Explorer guide is the same as the mainnet mode {% endhint %}

Lightning

Lightning client: LND

  • Follow the complete guide from the beginning, when you arrive at the Configuration section, edit lnd.conf
nano /data/lnd/lnd.conf
  • Replace the parameter bitcoin.mainnet=true with the bitcoin.testnet=true to enable LND in testnet mode
[Bitcoin]
bitcoin.testnet=true

{% hint style="info" %} If you use Ordirespector on testnet, add the next lines at the end of the file: {% endhint %}

[fee]
# Use external fee estimator
fee.url=https://nodes.lightning.computer/fees/v1/btctestnet-fee-estimates.json
  • When you arrive at the Create systemd service section, edit the lnd.service file and replace ExecStop parameter to this
ExecStop=/usr/local/bin/lncli --network=testnet stop

{% hint style="info" %} When you arrive at the Watchtower client section, keep in mind that the Watchtower server suggested won't work with the LND testnet, same with the LND mainnet peer suggested to open the channel and send a payment {% endhint %}

Interacting with the LND daemon

  • Note that when interacting with the LND daemon, you'll need to use the "--network testnet" flag. Example:
lncli --network=testnet --tlscertpath /data/lnd/tls.cert.tmp create

{% hint style="info" %} Note that it has a list of testnet aliases related to these commonly used commands to make it easier to introduce in the terminal. Follow the "Aliases bonus guide" to install it {% endhint %}

{% hint style="success" %} The rest of the Lightning Client guide is the same as the mainnet mode {% endhint %}

Channel backup

  • Follow the complete guide from the beginning, when you arrive at the "Create script" section, create the script
sudo nano /usr/local/bin/scb-backup --linenumbers
  • Replace the line 18 in the script to match with the testnet path
SCB_SOURCE_FILE="/data/lnd/data/chain/bitcoin/testnet/channel.backup"

{% hint style="info" %} If you have a mainnet node running on another device and you want to use the same GitHub account for the testnet channel backups:

  • Change this line on the script to this for example: REMOTE_BACKUP_DIR="/data/lnd/remote-lnd-testnet-backup"
  • When you arrive at the "Create a GitHub repository" section, change the name of the GitHub repo to for example: "remote-lnd-testnet-backup"
  • When you arrive at the "Clone the repository to your node" section, replace the command with: git clone [email protected]:<YourGitHubUsername>/remote-lnd-testnet-backup.git
  • When you arrive at the "GitHub test" section, replace the command to: cd remote-lnd-testnet-backup {% endhint %}

{% hint style="success" %} The rest of the Channel Backup guide is the same as the mainnet mode {% endhint %}

Web app: ThunderHub

  • Follow the complete guide from the beginning, when you arrive at the Configuration section, replace the next parameter to match with the testnet mode on the .env.local file
MEMPOOL_URL='https://mempool.space/testnet'
  • And replace the next parameter on the thubConfig.yaml file
macaroonPath: /data/lnd/data/chain/bitcoin/testnet/admin.macaroon

{% hint style="success" %} The rest of the Web app: Thunderhub is the same as the mainnet mode {% endhint %}

Mobile app: Zeus

  • Follow the complete guide from the beginning, when you arrive at the Create a lndconnect QR code section, modify the "lndconnect" command to match with the next

For example, to generate a QR code for a Wireguard VPN connection, enter this command:

{% code overflow="wrap" %}

lndconnect --host=10.0.1.1 --port=8080 --bitcoin.testnet --adminmacaroonpath=/home/admin/.lnd/data/chain/bitcoin/testnet/admin.macaroon --nocert

{% endcode %}

{% hint style="info" %} Be careful to add --nocert parameter only to the onion and Wireguard VPN network, the local network could be shared with more devices and you should use a valid certificate to encrypt the connection, so don't add that parameter in this case {% endhint %}

Bonus section

Bitcoin

Electrs

Follow the complete guide from the beginning, when you arrive at the "Firewall & reverse proxy section", follow the next steps:

Firewall & reverse proxy

  • Configure the Firewall to allow incoming requests
sudo ufw allow 60002/tcp comment 'allow Electrs SSL from anywhere'
sudo ufw allow 60001/tcp comment 'allow Electrs TCP from anywhere'
  • Create the electrs-reverse-proxy.conf file
sudo nano /etc/nginx/streams-enabled/electrs-reverse-proxy.conf
  • Replace the mainnet ports 50001/50002 with the 60001/60001 testnet ports
upstream electrs {
  server 127.0.0.1:60001;
}
server {
  listen 60002 ssl;
  proxy_pass electrs;
}
  • Test and reload Nginx configuration
sudo nginx -t
sudo systemctl reload nginx

Configuration

  • When you arrive at the Configuration section, replace it with the next lines
nano /data/electrs/electrs.conf
# MiniBolt: electrs testnet configuration
# /data/electrs/electrs.conf

# Bitcoin Core settings
network = "testnet"
cookie_file = "/data/bitcoin/testnet3/.cookie"
skip_block_download_wait = true

# Electrs settings
electrum_rpc_addr = "0.0.0.0:60001"
server_banner = "Welcome to electrs (Electrum Rust Server) running on a MiniBolt node testnet!"

Remote access over Tor

sudo nano /etc/tor/torrc
  • Edit the torrc file and replace ports to 60001/60002 to match with testnet mode
# Hidden Service Electrs Testnet TCP & SSL
HiddenServiceDir /var/lib/tor/hidden_service_electrs_testnet_tcp_ssl/
HiddenServiceVersion 3
HiddenServicePoWDefensesEnabled 1
HiddenServicePort 60001 127.0.0.1:60001
HiddenServicePort 60002 127.0.0.1:60002
  • Reload the Tor configuration and get your connection addresses
sudo systemctl reload tor
sudo cat /var/lib/tor/hidden_service_electrs_testnet_tcp_ssl/hostname

Example of expected output:

> abcdefg..............xyz.onion

{% hint style="success" %} The rest of the Channel Backup guide is the same as the mainnet mode {% endhint %}

Port reference

Here we are going to describe only what ports differ from the mainnet mode:

Port Protocol Use
18333 TCP P2P testnet port
18334 TCP P2P testnet secondary port
18332 TCP RPC testnet port
60001 TCP Electrum server testnet port
60002 TCP (SSL) Electrum server testnet encrypted port