Frequently Asked Questions

General Questions

What is OPN Chain?

OPN Chain is a high-performance EVM blockchain optimized for Ethereum compatibility. Built on proven Cronos technology, it offers:

• ~1 second block times

• 7 Gwei minimum gas price

• Full EVM compatibility

• Support for latest Ethereum features (Pectra)

How is OPN Chain different from Ethereum?

Feature	OPN Chain	Ethereum
Block Time	~1 second	~12 seconds
Gas Price	Fixed 7 Gwei	Variable
Consensus	Tendermint BFT	Proof of Stake
Finality	Instant	Probabilistic
Compatibility	100% EVM	Native

Is OPN Chain decentralized?

Yes! OPN Chain uses a decentralized network of validators running Tendermint consensus. Anyone can run a full node, and qualified participants can become validators.

What is the native token?

The native token is OPN, used for:

• Transaction fees (gas)

• Staking (validators)

• Governance voting

• Network security

Getting Started

How do I connect to OPN Chain?

1. Install MetaMask

2. Add OPN network:

   • Network Name: OPN Testnet

   • RPC URL: https://testnet-rpc.iopn.tech

   • Chain ID: 984

   • Symbol: OPN

See our detailed guide.

What wallets are supported?

Any Ethereum-compatible wallet works:

• MetaMask (recommended)

• Trust Wallet

• Coinbase Wallet

• Rainbow

• Hardware wallets (Ledger, Trezor)

• WalletConnect compatible wallets

How do I bridge assets to OPN Chain?

Official bridge coming soon! For testnet:

1. Get test tokens from faucet

2. No bridging needed for testing

3. Mainnet bridge will support major assets

Development Questions

Can I deploy my Ethereum contracts?

Yes! OPN Chain is 100% EVM compatible. Your existing contracts work without modification:

// Just change the RPC URL
const web3 = new Web3('https://testnet-rpc.iopn.tech');
// Everything else stays the same!

What development tools work with OPN?

All Ethereum tools are supported:

• Frameworks: Hardhat, Foundry, Truffle, Remix

• Libraries: Web3.js, Ethers.js, Viem

• Languages: Solidity, Vyper

• Testing: Waffle, Chai, Jest

What version of Solidity should I use?

Latest stable version (0.8.19+) recommended. OPN supports:

• All Solidity versions

• Pectra EVM features

• Latest opcodes

• Gas optimizations

How do I verify contracts?

Contract verification options:

1. Manual verification on block explorer (coming soon)

2. Hardhat verification plugin (when explorer launches)

3. API verification endpoints

Are there any OPN-specific features?

While maintaining full EVM compatibility, OPN offers:

• Faster block times (adjust timing logic)

• Stable gas prices (simplifies estimation)

• Instant finality (no reorg concerns)

Transaction Questions

What is the gas price?

Fixed minimum of 7 Gwei. Benefits:

• Predictable costs

• No gas wars

• Simple estimation

• Fair access

Why did my transaction fail?

Common reasons:

1. Insufficient gas limit: Increase gas limit

2. Nonce issues: Reset MetaMask account

3. Contract revert: Check revert reason

4. Insufficient balance: Get more test tokens

How long do transactions take?

• Average: 1-2 seconds

• Finality: Instant (no confirmations needed)

• No pending: Transactions process immediately

Can transactions be reversed?

No. Like all blockchains, transactions are immutable once confirmed. OPN's instant finality means no reorganizations.

What's the transaction format?

Standard Ethereum transactions:

• Type 0 (Legacy)

• Type 1 (EIP-2930)

• Type 2 (EIP-1559) All supported!

Node Operation

What are the hardware requirements?

Minimum:

• 4 CPU cores

• 16GB RAM

• 500GB SSD

• 100 Mbps connection

Recommended:

• 8+ CPU cores

• 32GB RAM

• 2TB NVMe SSD

• 1 Gbps connection

How do I run a node?

Quick start:

# Download binary
wget https://github.com/

# Initialize
./opn-node init

# Start
./opn-node start

Full guide: Running Nodes

Can I become a validator?

Yes! Requirements:

• Run reliable infrastructure

• Stake OPN tokens

• Maintain high uptime (99%+)

• Participate in governance

What's the difference between node types?

• Full Node: Validates transactions, serves RPC

• Archive Node: Stores all historical data

• Validator Node: Participates in consensus

• Light Client: Minimal verification (planned)

How do I monitor my node?

Key metrics to watch:

# Check sync status
curl localhost:26657/status

# Monitor peers
curl localhost:26657/net_info

# View metrics
curl localhost:26657/metrics

Smart Contract Questions

Is Pectra supported?

Yes! Full Pectra support including:

• EIP-7702 (EOA account code)

• Transient storage (TLOAD/TSTORE)

• Memory optimization (MCOPY)

• All latest opcodes

How do I optimize for OPN?

Key optimizations:

1. Account for 1-second blocks

2. Use stable gas price (7 Gwei)

3. Leverage instant finality

4. No reorg handling needed

Are there contract size limits?

Standard Ethereum limits apply:

• Max contract size: 24KB

• Max transaction size: 128KB

• Block gas limit: 30M

Can I use OpenZeppelin?

Yes! All standard libraries work:

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
// Works perfectly on OPN Chain!

How do I handle errors?

Standard Ethereum error handling:

require(condition, "Error message");
revert CustomError(param1, param2);
assert(invariant);

Security Questions

Is OPN Chain secure?

Security measures:

• Byzantine fault tolerant consensus

• Slashing for misbehavior

• Regular security audits

• Bug bounty program

• Proven codebase (Cronos)

How do I secure my contracts?

Best practices:

1. Use audited libraries (OpenZeppelin)

2. Follow security patterns

3. Test thoroughly

4. Get audits for production

5. Monitor after deployment

What about private keys?

Standard Ethereum security:

• Never share private keys

• Use hardware wallets

• Secure key storage

• Multi-sig for large amounts

Economic Questions

What's the token distribution?

Detailed tokenomics coming with mainnet. Testnet tokens have no value.

How are gas fees used?

Gas fees go to:

• Validators (block rewards)

• Network security

• Protocol development

• Community initiatives

Will there be staking?

Yes! Staking features:

• Validator staking (secure network)

• Delegation (earn rewards)

• Governance participation

• Slashing protection

What about inflation?

Inflation parameters:

• Controlled by governance

• Balanced for security

• Sustainable long-term

• Details at mainnet launch

Technical Issues

"Cannot connect to network"

Solutions:

1. Check RPC URL: https://testnet-rpc.iopn.tech

2. Verify Chain ID: 984

3. Clear browser cache

4. Try different browser

5. Check firewall settings

"Insufficient funds for gas"

Solutions:

1. Get tokens from faucet

2. Check gas price (minimum 7 Gwei)

3. Ensure enough for gas + value

4. Try smaller test amount

"Transaction underpriced"

Set gas price to at least 7 Gwei:

{
  gasPrice: '7000000000' // 7 Gwei in wei
}

"Nonce too high"

Reset account in MetaMask:

1. Settings → Advanced

2. Reset Account

3. Retry transaction

"Contract deployment failed"

Check:

1. Contract compiles successfully

2. Constructor parameters correct

3. Sufficient gas limit

4. Account has funds

Integration Questions

How do I integrate OPN in my DApp?

Simple integration:

// Just update your network config
const networks = {
  opn: {
    chainId: 984,
    rpcUrl: 'https://testnet-rpc.iopn.tech'
  }
};

Does Chainlink work on OPN?

Oracle integrations coming soon:

• Chainlink (planned)

• Band Protocol (evaluating)

• Native oracle solution

• API3 (considering)

Can I use Graph Protocol?

Indexing solutions:

• Graph Protocol (planned)

• Native indexer (in development)

• Custom indexing supported

What about IPFS integration?

Decentralized storage works normally:

• IPFS links in contracts

• Arweave integration

• Filecoin compatibility

• Standard patterns apply

Mainnet Questions

When is mainnet launching?

Mainnet timeline:

• Q3 2025: Final testnet phase

• Late Q4 2025: Mainnet launch

• Follow announcements in Discord!

Will testnet tokens transfer?

No. Testnet tokens are for testing only and have no value. Mainnet will have separate distribution.

How do I prepare for mainnet?

Preparation checklist:

1. Test your contracts thoroughly

2. Audit critical code

3. Plan migration strategy

4. Join validator program

5. Stay updated in Discord

What happens to testnet?

Testnet continues running:

• Permanent testing environment

• New feature testing

• Developer playground

• Free tokens always available

Community & Support

How do I get help?

Support channels:

1. Discord - Real-time help

2. Email: [e-mail]

Can I contribute?

Yes! Contribution areas:

• Code contributions

• Documentation

• Community support

• Bug reports

• Feature suggestions

Are there grants available?

Grant program launching soon:

• Development grants

• Ecosystem grants

• Research funding

• Bug bounties

Advanced Questions

How does Tendermint consensus work?

Tendermint BFT provides:

• Instant finality

• Byzantine fault tolerance

• No forks or reorgs

• High performance

Learn more

What's the state management model?

Ethereum-compatible state:

• Account model

• Patricia Merkle tries

• Storage slots

• State root calculation

Can I run MEV bots?

MEV on OPN Chain:

• Different dynamics due to fast blocks

• No mempool sniping

• Fair ordering

• Reduced MEV opportunities

Is there a grants DAO?

Governance structure:

• Community DAO (planned)

• Validator governance

• Grant distribution

• Protocol upgrades

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Still have questions?

• Ask in Discord

• Contact [e-mail]