# Becoming a Validator


If you intend to become a MainNet Validator, it is HIGHLY recommended that you practice on TestNet first in order to fully familiarise yourself with the process.


Whenever you use undcli to send Txs or query the chain ensure you pass the correct data to the --chain-id and if necessary --node= flags so that you connect to the correct network!


Validator nodes require high availability and uptimes. The following guide therefore assumes the node is running on a server/cloud VM, as opposed to a laptop or home PC.


There is a known issue with the syncable pruning option in the Cosmos SDK. Since pruning = "syncable" is the default value when und init is run, it is recommended to set the value to either pruning = "everything" or pruning = "nothing" in $HOME/.und_mainchain/config/app.toml. Note that setting to pruning = "nothing" will increase storage usage considerably.

# Contents

# Prerequisites

Before continuing, ensure you have gone through the following docs:

  1. Installing the software
  2. Join a Public Network
  3. Accounts and Wallets
  4. Chain ID - if you haven't already, you can get the current chain ID by running:
jq --raw-output '.chain_id' $HOME/.und_mainchain/config/genesis.json

The above command assumes you have downloaded the appropriate genesis for the network you wish to become a Validator on to the default $HOME/.und_mainchain directory.


you will need an account with sufficient FUND to self-delegate to your validator node.


if you intend to fully participate in the running of a network, your node will need to be permanently available and online. In which case, you will need to investigate running und as a background service

# Creating a validator


keep your $HOME/.und_mainchain/config/node_key.json and $HOME/.und_mainchain/config/priv_validator_key.json files safe and secure! These are required for your node to propose and sign blocks. If you ever migrate your node to a different host machine or need to restore your node, you will need these!

The first thing you will need is your node's Tendermint validator public key. This will be used to register your node as a Validator on the network. To get the key, open a terminal and run:

und tendermint show-validator

This will output your node's public key. Make a note of it, as it will be required soon.


Before continuing, ensure your full node has fully synced with the network and downloaded all the blocks (this may take a while, so go and make a brew). You can check the current network block height in the TestNet block explorer, or MainNet block explorer depending on the network you are joining. For each block your full node syncs, you will see:

I[2020-01-15|11:45:07.782] Executed block module=state height=12345 validTxs=24 invalidTxs=0

When the height is the same as the current network block number, your full node has completed syncing.

To create your Validator, you will need to generate, sign and broadcast a special transaction to the network which will register your Tendermint validator public key and stake the amount of FUND (in nund) specified (via self-delegation). Run the following command, modifying as required:

undcli tx staking create-validator \
  --amount=STAKE_IN_NUND \
  --website="YOUR_WEBSITE_URL" \
  --identity=16_DIGIT_KEYBASE_IO_ID \
  --details="NODE_DESCRIPTION" \
  --security-contact="SECURITY_CONTACT_EMAIL" \
  --chain-id=CHAIN_ID \
  --commission-rate="0.10" \
  --commission-max-rate="0.20" \
  --commission-max-change-rate="0.01" \
  --min-self-delegation="1" \
  --gas="auto" \
  --gas-prices="0.25nund" \
  --gas-adjustment=1.5 \

Mandatory fields

STAKE_IN_NUND: the amount in nund you want to delegate to yourself. For example, if you want to stake 1000 FUND, enter 1000000000000nund.


You can use the built in undcli conversion tool to calculate this:

undcli convert 1000 fund nund.


do not attempt to stake more than you have in your account. Ensure you have enough FUND to pay for the transaction fees, and enough left over for future transactions such as withdrawing rewards!

NODE_TENDERMINT_PUBLIC_KEY: Your node's tendermint public key, obtained earlier via the und tendermint show-validator command.

CHAIN_ID: the chain you are creating a validator for. This was obtained previously via the jq command, and will be for example FUND-Mainchain-TestNet-v8 or FUND-Mainchain-MainNet-v1 etc.

SELF_DELEGATOR_ACCOUNT: the name of the account being used to stake self-delegated FUND and sign the transaction — for example, the identifier you entered when running the undcli keys add command to create/import an account.

YOUR_VALIDATOR_MONIKER: a moniker which will publicly identify your Validator node on the network.

Optional fields


Ensure you create your validator with as much of the following additional information as you can. It will be publicly visible, and help potential stakers connect with you

YOUR_WEBSITE_URL: the URL for the site promoting your validation node

16_DIGIT_KEYBASE_IO_ID: Your 16 digit public keybase.io PGP public key ID if you have one and want to associate your ID to your validator node.

NODE_DESCRIPTION: a brief description of your validator node

SECURITY_CONTACT_EMAIL: Email address for the security contact for your validator node

Commission Rates

Your commission rates can be set using the --commission-rate , --commission-max-change-rate and --commission-max-rate flags.

--commission-rate: The % commission you will earn from delegators’ rewards. Keeping this relatively low can attract more delegators to your node.

--commission-max-rate: The maximum you will ever increase your commission rate to — you cannot raise commission above this value. Again, keeping this low can attract more delegators.

--commission-max-change-rate: The maximum you can increase the commission-rate by per day. For example, if your maximum change rate is 0.01, you can only make changes in 0.01 increments, so from 0.10 (10%) to 0.11 (11%).


The values for --commission-max-change-rate and --commission-max-rate flags cannot be changed after the create-validator command has been run.

Finally, the --min-self-delegation flag is the minimum amount of nund you are required to keep self-delegated to your validator, meaning you must always have at least this amount self-delegated to your node.

Example: creating a TestNet validator

undcli tx staking create-validator \
--amount=1000000000000nund \
--pubkey=undvalconspub1zcjduepq6yq7drzefkavsrxhxk69cy63tj3r... \
--moniker="MyAwesomeNode" \
--website="https://my-node-site.com" \
--details="My node is awesome" \
--security-contact="[email protected]" \
--chain-id=FUND-Mainchain-TestNet-v8 \
--commission-rate="0.07" \
--commission-max-rate="0.20" \
--commission-max-change-rate="0.01" \
--min-self-delegation="1000000000" \
--gas="auto" \
--gas-prices="0.25nund" \
--gas-adjustment=1.5 \

The command will return a Tx hash, which you can use to query whether or not the transaction was successful:

undcli query tx TX_HASH --chain-id FUND-Mainchain-TestNet-v8


you can set the --broadcast-mode flag in the command to block. This will tell undcli to wait for the transaction to be processed in a block before returning the result. This will take up to 5-6 seconds to complete, but the Tx result will be included in the output.

# Verify

You can verify your node is registered as a validator by running:

undcli query staking validator \
$(undcli keys show SELF_DELEGATOR_ACCOUNT --bech=val -a) \

replacing SELF_DELEGATOR_ACCOUNT and CHAIN_ID accordingly.

Last Updated: 8/24/2020, 10:41:00 AM