Run a Testnet Validator

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

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

# 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 linesexport GOROOT=/usr/local/goexport GOPATH=$HOME/goexport PATH=$GOPATH/bin:$GOROOT/bin:$PATH

# Install Opera(validator)$ git clone https://github.com/Fantom-foundation/go-opera.git(validator)$ cd go-opera/(validator)$ git checkout release/1.0.1-rc.1(validator)$ make

$./build/opera help​VERSION:1.0.1-rc.1

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 &

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:

(validator)$ ./opera validator new

Your new key was generated​Public key:                  0xPubkeyPath 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!

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):

abi = 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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 checksfcc.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 idsfcc.getValidatorID("{VALIDATOR_WALLET_ADDRESS}")

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

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

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")):

# Register your validatortx = 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 transactionftm.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:

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

It should now return something other than “0”.

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 &