# Installing the Mainchain Software

This documentation outlines how to install the Unification Mainchain software, in order to participate and interact with any of the Mainchain networks.

# Contents

# Installing the latest release binaries

The latest pre-compiled binaries are available for download from https://github.com/unification-com/mainchain/releases (opens new window).

  • The und binary has been compiled for Linux, OSX and Windows.

Download the latest version:

wget https://github.com/unification-com/mainchain/releases/download/1.5.1/und_v1.5.1_linux_x86_64.tar.gz
wget https://github.com/unification-com/mainchain/releases/download/1.5.1/checksums.txt

Once downloaded, you can verify the SHA256 checksum against those listed in the release's checksums.txt, for example:

$ openssl dgst -sha256 und_v1.5.1_linux_x86_64.tar.gz
SHA256(und_v1.5.1_linux_x86_64.tar.gz)= ...12324abcd...

Extract them and copy the binaries to a suitable location - preferably a location in your $PATH environment variable, for example /usr/local/bin.

tar -zxvf und_v1.5.1_linux_x86_64.tar.gz
sudo mv und /usr/local/bin/und

Once installed, verify:

which und

should output:



und version --log_level=""

The output should match the latest release version tag.

# Building from Source

The Mainchain binaries can also be built from source.

# Prerequisites

git, curl and make are required to build the binaries. jq is also useful for quickly looking up values in genesis.json

These can all be installed via your package manager:

sudo apt-get install git curl make jq


sudo yum install git curl make jq

# Install Go

Go 1.16+ is required to build the Mainchain binaries

Install go by following the official docs (opens new window). Once Go is installed, set your $PATH environment variable:

$ mkdir -p $HOME/go/bin
$ echo "export PATH=$PATH:$(go env GOPATH)/bin" >> ~/.bash_profile
$ source ~/.bash_profile

# Build and install the binaries


unless you are contributing to Mainchain development, it is recommended you checkout and build from the latest release tag and not the master branch if you intend to connect to a live, public network (e.g. TestNet/MainNet).

Download the latest tagged Mainchain release from https://github.com/unification-com/mainchain/releases (opens new window)

The [latest-release-tag] required for the command below can also be obtained by running:

curl --silent "https://api.github.com/repos/unification-com/mainchain/releases/latest" | grep -Po '"tag_name": "\K.*?(?=")'
$ git clone -b [latest-release-tag] https://github.com/unification-com/mainchain
$ cd mainchain
$ make install

This will install the two binaries und and und into your $HOME/go/bin

# Verify the installation

Run the following commands:

$ und version --long

If they have installed correctly, you should see output similar to the following:

name: UndMainchain
server_name: und
version: 1.5.1
commit: 8bbd2b3dabebf8186c19b452f5331071f79e48f1
build_tags: netgo
go: go version go1.16.2 linux/amd64
- github.com/99designs/[email protected] => github.com/cosmos/[email protected]
- github.com/ChainSafe/[email protected]
- ... SNIP ...
cosmos_sdk_version: v0.42.11

# Development

The included Mainchain DevNet network can be used for development and testing of new features and bug fixes locally. To build the binaries for testing without installing, run:

make build

This will output the binaries to the ./build directory located in the repository root.

See the DevNet docs for more information about running DevNet.

# CLI Help

Both the und and und commands can have the --help flag passed to output details on what commands are available, and flags enabled for that command:

und --help

Likewise, the --help flag can be passed to subcommands, for example:

und query wrkchain --help

# Next

Running Devnet, joining a network