Lamden Blockchain

Get a computer with Ubuntu 18.04.

• DigitalOcean droplets are our favorites if you are new.

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Install Pip3

sudo apt-get update
sudo apt-get install python3-pip -y

Install MongoDB

As copied from here: https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/

wget -qO - https://www.mongodb.org/static/pgp/server-4.2.asc | sudo apt-key add -
echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.2.list
sudo apt-get install -y mongodb-org
echo "mongodb-org hold" | sudo dpkg --set-selections
echo "mongodb-org-server hold" | sudo dpkg --set-selections
echo "mongodb-org-shell hold" | sudo dpkg --set-selections
echo "mongodb-org-mongos hold" | sudo dpkg --set-selections
echo "mongodb-org-tools hold" | sudo dpkg --set-selections
sudo systemctl start mongod

Install Haveged (Recommended)

For some reason, DigitalOcean droplets, and perhaps other cloud providers, have /dev/random blocking problems. This probably is because they are running many small computers on a single Linux instance and the entropy pool dries up pretty quickly. If this doesn't make sense, install Haveged and don't worry about it.

If it does, libsodium, which is the public-private key cryptography library we use, uses /dev/random with no option to use /dev/urandom. Haveged solves this problem.

sudo apt-get install haveged -y
systemctl start haveged
systemctl enable haveged

Install Lamden

pip3 install lamden

Make a Constitution

nano ~/constitution.json

{
  "masternodes": [<list of vks here>],
  "masternode_min_quorum": <int>,
  "delegates": [<list of vks here>],
  "delegate_min_quorum": <int>
}

Ctrl+X, save the file.

Start your node

lamden <masternode | delegate> -k <sk in hex format> -bn <list of ip addresses that are currently online>

Autoinstall

You can install a script to install the entire software.

wget https://raw.githubusercontent.com/Lamden/lamden/dev/INSTALL.sh

Always practice good saftey and examine the bash file before executing it.