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: info@iopn.io

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

Still have questions?

  • Ask in Discord

  • Contact info@iopn.io

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