Run a Testnet Validator

Requirements

  • Minimum stake: 1,000,000 FTM

  • Minimum hardware requirements: AWS EC2 m5.large with 8GB RAM, 2 vCPUs and at least 300GB of Amazon EBS General Purpose SSD (gp2) storage (or equivalent).

  • We would recommend going with Ubuntu Server 20.04 LTS (64-bit).

Network Settings

Open up port 22 for SSH, as well as port 5050 for both TCP and UDP traffic.

Install Required Tools

You are still logged in as the new user via SSH. Now we are going to install Go and Opera.

First, install the required build tools:

# Install build-essential
(validator)$ sudo apt-get install -y build-essential
# Install go
(validator)$ wget https://dl.google.com/go/go1.15.10.linux-amd64.tar.gz
(validator)$ sudo tar -xvf go1.15.10.linux-amd64.tar.gz
(validator)$ sudo mv go /usr/local
# Export go paths
(validator)$ vi ~/.bash_aliases
# Append the following lines
export GOROOT=/usr/local/go
export GOPATH=$HOME/go
export PATH=$GOPATH/bin:$GOROOT/bin:$PATH

Install Opera

# Install Opera
(validator)$ git clone https://github.com/Fantom-foundation/go-opera.git
(validator)$ cd go-opera/
(validator)$ git checkout release/1.0.2-rc.5
(validator)$ make

Validate your Opera installation:

$./build/opera help
VERSION:
1.0.2-rc.5

Register Testnet Validator

Next, register your Fantom testnet validator node. You need to create a validator wallet. The wallet is the validator’s identity in the network which it uses to authenticate, sign messages, etc. First, start the Opera read-only node to interact with it and to create a validator wallet:

# Start opera node
(validator)$ cd build/
(validator)$ wget https://opera.fantom.network/testnet.g
(validator)$ nohup ./opera --genesis testnet.g --nousb &

Create a validator wallet

The node running and syncing the network in your current console, so you need to open up a new console window, connect via SSH to the server and enter the following commands to create a wallet:

# Create validator wallet
(validator)$ ./opera account new

After entering the command, you will get prompted to enter a password for the account (= wallet). It will look something like this:

Create a new validator key

We have to create validator private key to sign consensus messages with. It can be done only using go-opera (https://github.com/Fantom-foundation/lachesis_launch/blob/master/docs/create_validator.md):

(validator)$ ./opera validator new

Follow the prompts and supply the password, the output is as follows:

Your new key was generated
Public key: 0xPubkey
Path of the secret key file:
- You can share your public key with anyone. Others need it to validate messages from you.
- You must NEVER share the secret key with anyone! The key controls access to your validator!
- You must BACKUP your key file! Without the key, it's impossible to operate the validator!
- You must REMEMBER your password! Without the password, it's impossible to decrypt the key!

Create your validator via the SFC

Open up the console where you entered the commands to create the validator wallet previously and attach to the Opera node console:

# Attach to opera console
(validator)$ ./opera attach

By doing so, you will get a JavaScript console where you can directly interact with the Opera node and e.g. send transactions (which you will do in a moment):

Now initialize the SFC contract ABI variable (https://github.com/Fantom-foundation/lachesis_launch/blob/master/releases/sfc-abi-3.0.0-rc.1.json):

abi = JSON.parse('[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"validatorID","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"status","type":"uint256"}],"name":"ChangedValidatorStatus","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"delegator","type":"address"},{"indexed":true,"internalType":"uint256","name":"toValidatorID","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"lockupExtraReward","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"lockupBaseReward","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"unlockedReward","type":"uint256"}],"name":"ClaimedRewards","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"validatorID","type":"uint256"},{"indexed":true,"internalType":"address","name":"auth","type":"address"},{"indexed":false,"internalType":"uint256","name":"createdEpoch","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"createdTime","type":"uint256"}],"name":"CreatedValidator","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"validatorID","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"deactivatedEpoch","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"deactivatedTime","type":"uint256"}],"name":"DeactivatedValidator","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"delegator","type":"address"},{"indexed":true,"internalType":"uint256","name":"toValidatorID","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Delegated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"delegator","type":"address"},{"indexed":true,"internalType":"uint256","name":"validatorID","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"duration","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"LockedUpStake","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"delegator","type":"address"},{"indexed":true,"internalType":"uint256","name":"toValidatorID","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"lockupExtraReward","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"lockupBaseReward","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"unlockedReward","type":"uint256"}],"name":"RestakedRewards","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"delegator","type":"address"},{"indexed":true,"internalType":"uint256","name":"toValidatorID","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"wrID","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Undelegated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"delegator","type":"address"},{"indexed":true,"internalType":"uint256","name":"validatorID","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"penalty","type":"uint256"}],"name":"UnlockedStake","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"UpdatedBaseRewardPerSec","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"blocksNum","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"period","type":"uint256"}],"name":"UpdatedOfflinePenaltyThreshold","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"validatorID","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"refundRatio","type":"uint256"}],"name":"UpdatedSlashingRefundRatio","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"delegator","type":"address"},{"indexed":true,"internalType":"uint256","name":"toValidatorID","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"wrID","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdrawn","type":"event"},{"constant":true,"inputs":[],"name":"baseRewardPerSecond","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"contractCommission","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant"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… as well as the SFC contract object itself:

sfcc = web3.ftm.contract(abi).at("0xfc00face00000000000000000000000000000000")

After initializing both variables, you can now interact with the network’s SFC. Enter the following command to check that everything works as expected:

// Sanity check
sfcc.lastValidatorID() // if everything is all right, will return a non-zero value

If it looks like this, everything is OK (you should not get an error here).

Next, try to get your validatorID from the SFC using your previously generated validator wallet address:

# Get your validator id
sfcc.getValidatorID("{VALIDATOR_WALLET_ADDRESS}")

This should return 0, as you are not registered as a validator yet:

Next, unlock your validator wallet to be able to execute the registration transaction (make sure to use the password you set before):

# Unlock validator wallet
personal.unlockAccount("{VALIDATOR_WALLET_ADDRESS}", "{PASSWORD}", 60)

This will return “true” if unlocking the wallet was successful:

Next, send the createValidator transaction to register your validator (the value is the representation of the smallest FTM unit, so dividing it be 1e18 will result in 3,175,000 FTM. Alternatively, you can use web3.toWei("3175000.0", "ftm")). Use quotes for "YOUR_PUBKEY" and "YOUR_ADDRESS":

# Register your validator
tx = sfcc.createValidator("YOUR_PUBKEY", {from:"YOUR_ADDRESS", value: web3.toWei("3175000.0", "ftm")}) // 3175000.0 FTM

Make sure to check your registration transaction (could take a few moments to be confirmed):

# Check your registration transaction
ftm.getTransactionReceipt(tx)

Look for the status: “0x1” at the bottom, which means the transaction was successful.

You can also copy the transactionHash and go the Fantom Explorer and check your transaction there:

https://explorer.testnet.fantom.network/transactions/[YOURTX]

Finally, execute the following command again to check your validatorID:

# Get your validator id
sfc.getValidatorID("{VALIDATOR_WALLET_ADDRESS}")

It should now return something other than “0”.

Congrats, you've registered a testnet validator!

Run your Testnet Validator Node

The last step is to restart your node in validator mode! Close the Opera console window by typing “exit”. Then head back to the console window where you started your node with the following command:

(validator)$ nohup ./opera --genesis testnet.g --nousb --validator.id ID --validator.pubkey 0xPubkey --validator.password /path/to/password &

*For latest update, please check https://github.com/Fantom-foundation/lachesis_launch.