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Raspberry Pi 4: a zcashd Full node guide

The purpose of this guide is to help educate Zcashers who are interested in running a full node on a low-powered Raspberry Pi 4.

If you find this guide useful, consider donating ZEC to support ZecHub:

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What you will learn

How to create a bootable Ubuntu Server microSD card
How to setup internet connectivity on the Raspberry Pi 4
How to access your Raspberry Pi 4 remotely
How to install zcashd
How to setup zcashd
How to use zcashd

Prerequisites

8GB Raspberry Pi 4 Canakit or equivalent
A computer with a microSD card drive
A Wi-Fi network or an ethernet cable with an internet connection
External SSD/HHD with USB3 support

note: keeping your server secure is not simple by any means. Any tips/recommendations/best practices beyond what is talked about in this guide please create a PR and help keep this guide as up-to-date as possible.

Choose OS and Storage Device. Since Raspberry Pi 4's are 64 bit, I recommend choosing "Other general-purpose OS" => Ubuntu => Ubuntu Server 22.10 (64 bit). Click on Storage and select your SD Card
Before writing to SD card, click on Advanced options by clicking on the white gear icon near the bottom right corner.

Here you can update:
- Hostname of your Raspberry Pi 4
- Enable SSH
- Create a username and pw
- Enable and configure your wi-fi if needed

Once complete hit Write

Boot Ubuntu Server

If you have an extra monitor and keyboard plug those in now. Note: these are optional.

Install the SD card you just formatted into the Raspberry Pi 4 and also plug in the External SSD/HHD into the USB3 port. Also plug in the power cord and turn it on.

Connect remotely to your Raspberry Pi 4

We now need to connect to your Raspberry Pi 4. Things we need:
- Username and pw (from previous step)
- IP address so we can use SSH
- Monitor, and keyboard (optional)
If you have a monitor and keyboard connected directly to your pi, the rest of this section can be skipped.
Two ways to find your IP address are via your router admin page, or with nmap. If using the router, it depends on which manufacture and I'll defer those details to a quick google search.
- For nmap, first make sure it is installed:
sudo apt-get install nmap
- Find the IP address of your current computer and note the first three sections. This is typically 192.168.1.xxx or 192.168.50.xxx
- Plug these details into nmap as follows:
  - sudo nmap -sn 192.168.50.0/24 or sudo nmap -sn 192.168.1.0/24
  - This will display all devices connected to your home network, which should reveal your Raspberry Pi 4's IP address / MAC address
Using your username, pw, and IP address we can now login using SSH
- ssh <username>@<ip address of your pi> note: you must plugin your username and your IP address, and your pw when prompted.
- For example: ssh ubuntu@192.168.1.25 where the username is ubuntu and IP address is 192.168.1.25.
If youâre curious which version Raspberry Pi you are using, try this command:

cat /sys/firmware/devicetree/base/model ; echo

Installing zcashd

Two ways of installing zcashd include downloading a precompiled binary or compiling zcashd from source. I highly recommend compiling from source.
- If downloading a precompiled binary one source is adityapk00 . Note that since we are running a 64 bit OS, we want zcash-linux-aarch64-v*.tar.gz. Also note that up-to-date versions of zcashd are rarely precompiled.
- For compiling yourself it is highly recommended to cross-compile. Cross-compile is to build on one platform a binary that will run on another platform. One reason for this is Raspberry Pi 4's are low-powered and thus not very fast! Leverage your main computer to help with this. You can grab the latest release here .
- To cross compile we need to make sure we have the needed packages. Install the following:
  - sudo apt-get install build-essential pkg-config libc6-dev m4 g++-multilib autoconf libtool ncurses-dev unzip git python3 python3-zmq zlib1g-dev curl bsdmainutils automake libtinfo5
  - sudo apt-get install gcc-aarch64-linux-gnu
- Next change directory into the freshly downloaded zcashd release and run:
  
  HOST=aarch64-linux-gnu ./zcutil/build.sh
- https://youtu.be/SGYrzhs1l2k

Setup zcashd

We now need to transfer all the zcashd binary files to your Raspberry Pi 4. As of Zcashd v5.3 the needed files include:

zcashd zcash-cli zcash-tx zcash-gtest zcash-inspect zcashd-wallet-tool fetch-params.sh
These files are found in the /src directory of your latest release download location if you compiled them yourself. Otherwise, the precompiled files are where you downloaded them.
Two ways of achieving the tranfers are either using SFTP, or by using your External drive.

SFTP

sftp username@<ip of RaspberryPi4>

put zcashd

put zcash-cli

put zcash-tx

put zcash-gtest

put zcash-inspect

put zcashd-wallet-tool

put fetch-params.sh

OR

Simply copy the files onto the External before you plug it into the Raspberry Pi 4.
If you already have a full node synced and want to save time, you can also copy the blocks and chainstate data.

cd ~/.zcash/
- Simply run:
tar -zcvf blocks.tar.gz /blocks tar -zcvf chainstate.tar.gz /chainstate
- Copy the blocks and chainstate .gz files into your External SSD/HHD.
Using External SSD/HHD on your Raspberry Pi 4
- Mount the External SSD/HDD in the Media folder so you can see it:
  
  lsblk will display all drives connected. Most will be of the format sda
  
  id will show your user and group id's.
sudo mount -o umask=0077,gid=<groupid>,uid=<userid> /dev/sda1 /media/portableHD/
- Keep an eye on both who owns the folders/files and also the permissions.
  
  sudo chown -R <username>: portableHD sudo chmod -R 700 portableHD/
- If you copied the blocks and chainstate .gz files from your other computer untar these now. Make sure they are in the .zcash folder on your External drive.
  
  tar - xvzf blocks.tar.gz tar - xvzf chainstate.tar.gz
Setup /media/portableHD/.zcash/zcash.conf

notice how we moved the datadir to the External SSD/HDD which has much more space available.
Since the default .zcash folder location has been moved, we need to tell zcashd this by using symbolic links:

cp -rp ~/.zcash/* /new_dir // Make copy of datadir or supply with an external HD

rm -rf ~/.zcash // Remove default folder

ln -s /media/portableHD/ ~/.zcash // Symbolic link new data location to the default so zcashd is happy
Run fetch-params.sh script to download needed data for zcashd

./fetch-params.sh
Start a new 'screen' [ program in linux ]. Open zcashd with -datadir set:
- screen -S zcashScreen
- ./zcashd -datadir=/media/portableHD/.zcash/
- Detach the screen. Ctrl+a , Ctrl+d
Create an alias so you dont have to type out all these extra data location commands

alias zcash-cli="./zcash-cli -datadir=/media/portableHD/.zcash/"
Ready to use!

zcash-cli getblockchaininfo

Using zcashd

How do you check the status of your node?

tail -n 500 <path to>/.zcash/debug.log
To get current height from your log

tail -n 10 <path to>/.zcash/debug.log | grep -o 'height=[^b]*'

zcash-cli getinfo

How do you send a memo?
- As seen here , download
  
  ascii2hex
  
  and
  
  hex2ascii
- Make them executable
  
  chmod +x ascii2hex hex2ascii
- Create a memo and convert it to hex. You can convert back to ascii to test.

Create a z2z transaction (Sapling) using the hex version of your memo from above

zcash-cli z_sendmany "ztestsapling1kg3u0y7szv6509732at34alct46cyn0g26kppgf2a7h5tpqxldtwm7cmhf8rqmhgt" "[{\"address\": \"ztestsapling2kg3u0y7szv6509732at34alct46cyn0g26kppgf2a7h5tpqxldtwm7cmhf8rqmhgtmpakcz5mdv\",\"amount\": 0.0001, \"memo\":\"5A656348756221\"}]"
How do you resume your zcashScreen after you detached it?

screen -r zcashScreen
How do you stop zcashd ?

zcash-cli stop
How do you create a UA?

zcash-cli z_getnewaccount
- Now build a UA receiver according to your needs. This includes Orchard only, Orchard + Sapling, and finally Orchard + Sapling + Transparent.
- Note you can tell the difference between receivers by how long they are.

zcash-cli z_getaddressforaccount 0 '["orchard"]'

zcash-cli z_getaddressforaccount 0 '["orchard","sapling"]'

zcash-cli z_getaddressforaccount 0 '["orchard","sapling","p2pkh"]'

How do you send ZEC using a UA?

zcash-cli z_sendmany "fromOaddress" "[{\"address\": \"dOrchardAddress\",\"amount\": 0.0001, \"memo\":\"yourMemoinHex\"}]" <minconf> <fee> <privacyPolicy>

It should be noted both, from AND destination addresses can be transparent,sapling, or orchard addresses however you may need to adjust the privacyPolicy flag in order for the transation to be valid. (Some combos wont work if privacyPolicy doesn't make sense!)

Where can I find more info on UA's?
- Check out Hanh's post on transaction privacy. Also this post from the zcash forum.
- This

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