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Validator Node

Running a Validator node means providing validator services for the network, processing transactions and maintaining consensus.

What You'll Need
  • Linux/macOS system with adequate hardware
  • Stable internet connection
  • Ethereum RPC endpoint (mainnet for Aristotle, HoleSky testnet for Galileo)

Hardware Requirements​

ComponentMainnet (Aristotle)Testnet (Galileo)
Memory64 GB64 GB
CPU8 cores8 cores
Disk1 TB NVME SSD4 TB NVME SSD
Bandwidth100 MBps for Download / Upload100 MBps for Download / Upload

Restaking RPC Configuration​

  • Validator Nodes: When running your consensus client, add the following flags to enable restaking and configure the Symbiotic RPC:
--chaincfg.restaking.enabled \
--chaincfg.restaking.symbiotic-rpc-dial-url ${ETH_RPC_URL} \
--chaincfg.restaking.symbiotic-get-logs-block-range ${BLOCK_NUM}

  • ETH_RPC_URL: The RPC endpoint for the Symbiotic network.

  • BLOCK_NUM: The maximum block number range per call when syncing restaking events. Default is 1. Adjust based on your RPC provider limits.

  • Non-Validator Nodes: No restaking-related configuration is required; you can keep your current startup parameters unchanged.

This enables staking in Symbiotic contracts on Ethereum (mainnet: Ethereum, testnet: HoleSky) to participate in 0G Chain consensus. Validators must be able to read the Ethereum contract state to generate and verify new blocks. You can run your own node or use a third-party RPC provider such as QuickNode or Infura for ${ETH_RPC_URL}.

Non-Validator Nodes

Restaking configuration is NOT required for non-validator nodes. Do not add the --chaincfg.restaking.* flags when running non-validator nodes.

Mainnet (Aristotle) Setup Guide​

1. Download Package​

Download the latest Aristotle mainnet package:

wget -O aristotle.tar.gz https://github.com/0gfoundation/0gchain-Aristotle/releases/download/1.0.2/aristotle-v1.0.2.tar.gz
Version Information

Latest Aristotle mainnet release: v1.0.2. Check releases page for newer versions.

2. Extract Package​

Extract the Aristotle node package to your home directory:

tar -xzvf aristotle-v1.0.0.tar.gz -C ~

3. Create Data Directory and Copy Configuration​

Create your data directory and copy the default configuration:

cd aristotle-v1.0.2

cp -r 0g-home {your data path}
sudo chmod 777 ./bin/geth
sudo chmod 777 ./bin/0gchaind

4. Initialize Geth​

Initialize the Geth execution client with the genesis configuration:

./bin/geth init --datadir {your data path}/0g-home/geth-home ./geth-genesis.json

Expected output: "Successfully wrote genesis state"

5. Initialize 0gchaind for Mainnet​

Create a temporary initialization with the mainnet chain specification:

./bin/0gchaind init {node name} --home {your data path}/tmp --chaincfg.chain-spec mainnet

⚠️ Important: The --chaincfg.chain-spec mainnet flag is REQUIRED for validators

6. Copy Node Keys and Validator Keys​

Copy all necessary keys to the permanent directory:

cp {your data path}/tmp/data/priv_validator_state.json {your data path}/0g-home/0gchaind-home/data/
cp {your data path}/tmp/config/node_key.json {your data path}/0g-home/0gchaind-home/config/
cp {your data path}/tmp/config/priv_validator_key.json {your data path}/0g-home/0gchaind-home/config/

7. Generate JWT Authentication Token​

Generate a JWT token with mainnet specification for secure communication:

./bin/0gchaind jwt generate --home {your data path}/0g-home/0gchaind-home --chaincfg.chain-spec mainnet

cp -f {your data path}/0g-home/0gchaind-home/config/jwt.hex ./

8. Configure Node Name​

Update the node moniker in the configuration file:

sed -i 's/moniker = "0G-mainnet-aristotle-node"/moniker = "{your node name}"/' {your data path}/0g-home/0gchaind-home/config/config.toml

9. Verify Configuration Files​

Ensure all required configuration files are present:

ls -la {your data path}/0g-home/0gchaind-home/config/

Should display:

  • app.toml
  • client.toml
  • config.toml
  • genesis.json
  • jwt.hex
  • node_key.json
  • priv_validator_key.json

10. Set Environment Variables​

Configure required environment variables for Symbiotic restaking:

# Set your Ethereum RPC endpoint (mainnet)
export ETH_RPC_URL="https://eth-mainnet.g.alchemy.com/v2/YOUR_API_KEY"

# Set block range for syncing (adjust based on your RPC limits)
export BLOCK_NUM=1

11. Start 0gchaind​

Launch the 0gchaind consensus client with validator-specific parameters:

cd aristotle-v1.0.2

nohup ./bin/0gchaind start \
    --rpc.laddr tcp://0.0.0.0:26657 \
    --chaincfg.kzg.trusted-setup-path=kzg-trusted-setup.json \
    --chaincfg.engine.jwt-secret-path=jwt.hex \
    --chaincfg.block-store-service.enabled \
    --chaincfg.restaking.enabled \
    --chaincfg.restaking.symbiotic-rpc-dial-url ${ETH_RPC_URL} \
    --chaincfg.restaking.symbiotic-get-logs-block-range ${BLOCK_NUM} \
    --home {your data path}/0g-home/0gchaind-home \
    --p2p.external_address {your node ip}:26656 > {your data path}/0g-home/log/0gchaind.log 2>&1 &

Validator-Specific Parameters:

  • --chaincfg.restaking.enabled: Enables restaking functionality
  • --chaincfg.restaking.symbiotic-rpc-dial-url: Ethereum RPC for Symbiotic protocol
  • --chaincfg.restaking.symbiotic-get-logs-block-range: Block range per sync call

12. Start Geth​

Launch the Geth execution client:

cd aristotle-v1.0.2

nohup ./bin/geth \
    --config geth-config.toml \
    --nat extip:{your node ip} \
    --datadir {your data path}/0g-home/geth-home \
    --networkid 16661 > {your data path}/0g-home/log/geth.log 2>&1 &

13. Verify Node Status​

Check that both services are running correctly:

# Check 0gchaind logs
tail -f {your data path}/0g-home/log/0gchaind.log

# Check geth logs
tail -f {your data path}/0g-home/log/geth.log

Validator Operations​

Initialize Your Validator​

Once your validator node is running and fully synced (catching_up: false), you need to initialize your validator on the blockchain to start validating transactions.

Next Step: Follow the Validator Initialization Guide to:

  1. Generate validator signature
  2. Prepare validator description and settings
  3. Execute the initialization transaction
  4. Verify your validator activation (typically 30-60 minutes)

Monitor Consensus Participation​

# Check if your validator is in the active set
curl http://localhost:26657/validators | jq

Check Sync Status​

# Should show "catching_up": false when fully synced
curl http://localhost:26657/status | jq '.result.sync_info'

Key Management​

⚠️ Critical Security Notice:

  • Backup your validator keys immediately: priv_validator_key.json and node_key.json
  • Never share your private validator key with anyone
  • Store backups in multiple secure locations
  • Test recovery process in a non-production environment first
Backup & Recovery

These files are essential for validator recovery and must be backed up securely:

# Essential validator keys
/{your data path}/0g-home/0gchaind-home/config/

Recovery Process​

To restore your validator from backup:

  1. Stop running services:

    pkill 0gchaind
    pkill geth

  2. Restore key files:

    cp ~/validator-backup/node_key.json /{your data path}/0g-home/0gchaind-home/config/
    cp ~/validator-backup/priv_validator_key.json /{your data path}/0g-home/0gchaind-home/config/

  3. Restart services following the appropriate setup guide steps.

Upgrade Validator

Step 1: Extract New Release​

# For Testnet (Galileo)
wget -O galileo.tar.gz https://github.com/0gfoundation/0gchain-NG/releases/download/v3.0.2/galileo-v3.0.2.tar.gz
tar -xzvf galileo.tar.gz -C ~

# For Mainnet (Aristotle)
wget -O aristotle.tar.gz https://github.com/0gfoundation/0gchain-Aristotle/releases/download/1.0.2/aristotle-v1.0.2.tar.gz
tar -xzvf aristotle.tar.gz -C ~

# Verify extraction
ls -la {network}-v{version}/

Step 2: Stop Services​

# Stop consensus layer (0gchaind)
pkill 0gchaind

# Stop execution layer (geth)
pkill geth

Step 3: Backup Your Data​

# Create backup directory with timestamp
BACKUP_DIR="backup-$(date +%Y%m%d-%H%M%S)"
mkdir -p $BACKUP_DIR

# Backup execution layer data (geth-home)
cp -r {your_geth_datadir} $BACKUP_DIR/geth-backup

# Backup consensus layer data (0gchaind-home)
cp -r {your_0gchaind_home} $BACKUP_DIR/0gchaind-backup

Step 4: Start Node​

If you get error while starting node due to missing priv_validator_state.json, create an empty priv_validator_state.json file in that directory with {}.

For testnet (Galileo), use --chaincfg.chain-spec testnet:

nohup ./bin/0gchaind start \
    --rpc.laddr tcp://0.0.0.0:26657 \
    --chaincfg.chain-spec testnet \
    --chaincfg.restaking.enabled \
    --chaincfg.restaking.symbiotic-rpc-dial-url ${ETH_RPC_URL} \
    --chaincfg.restaking.symbiotic-get-logs-block-range ${BLOCK_NUM} \
    --chaincfg.kzg.trusted-setup-path=kzg-trusted-setup.json \
    --chaincfg.engine.jwt-secret-path=jwt.hex \
    --chaincfg.block-store-service.enabled \
    --home {your_cl_home} \
    --p2p.external_address {your_node_ip}:26656 > {your_log_path}/0gchaind.log 2>&1 &

For mainnet (Aristotle), use --chaincfg.chain-spec mainnet:

nohup ./bin/0gchaind start \
    --rpc.laddr tcp://0.0.0.0:26657 \
    --chaincfg.chain-spec mainnet \
    --chaincfg.restaking.enabled \
    --chaincfg.restaking.symbiotic-rpc-dial-url ${ETH_RPC_URL} \
    --chaincfg.restaking.symbiotic-get-logs-block-range ${BLOCK_NUM} \
    --chaincfg.kzg.trusted-setup-path=kzg-trusted-setup.json \
    --chaincfg.engine.jwt-secret-path=jwt.hex \
    --chaincfg.block-store-service.enabled \
    --home {your_cl_home} \
    --p2p.external_address {your_node_ip}:26656 > {your_log_path}/0gchaind.log 2>&1 &

Then start Geth:

nohup ./bin/geth --config geth-config.toml \
     --nat extip:{your_node_ip} \
     --datadir {your_geth_datadir} \
     --networkid {network_id} > {your_log_path}/geth.log 2>&1 &

Step 5: Verify Upgrade Success​

# Monitor consensus layer logs
tail -f {your_log_path}/0gchaind.log

# Monitor execution layer logs
tail -f {your_log_path}/geth.log

Next Steps​

Staking Integration​

Once your validator node is running, you can interact with the staking system programmatically using smart contracts: