Technical Specifications
Network Specifications
Chain Information
Chain Name
OPN Chain
Official network name
Chain ID
984 (0x3d8)
EIP-155 chain identifier
Network ID
984
Network identifier
Native Token
OPN
Native currency
Token Decimals
18
Standard ERC-20 decimals
EVM Version
Pectra
Latest Ethereum features
Network Endpoints
Testnet
https://testnet-rpc.iopn.tech
wss://testnet-ws.iopn.tech
✅ Active
Mainnet
https://rpc.iopn.tech
wss://ws.iopn.tech
🚧 Coming Soon
Block Specifications
Target Block Time
1 second
Average block production time
Block Gas Limit
30,000,000
Maximum gas per block
Max Block Size
~2 MB
Approximate maximum block size
Empty Blocks
Allowed
Can produce empty blocks
Transaction Specifications
Min Gas Price
7 Gwei (7 × 10⁹ wei)
Minimum transaction gas price
Gas Price Increment
0.1 Gwei
Minimum price increment
Max Transaction Size
128 KB
Maximum transaction data size
Transaction Timeout
20 blocks
Mempool expiration time
Max Gas per TX
30,000,000
Same as block limit
Consensus Specifications
Tendermint Parameters
Consensus Algorithm
Tendermint BFT
Byzantine Fault Tolerant consensus
Block Proposer
Round-robin
Validator selection method
Voting Power
Stake-weighted
Based on staked tokens
Quorum
2/3 + 1
Required for consensus
Timing Parameters
Timeout Propose
3000ms
Time for block proposal
Timeout Prevote
1000ms
Time for prevoting
Timeout Precommit
1000ms
Time for precommitting
Timeout Commit
1000ms
Time after commit
Skip Timeout Commit
false
Always wait full timeout
Validator Specifications
Max Validators
100
Maximum active validator set
Min Self Delegation
1 OPN
Minimum self-stake
Unbonding Period
21 days
Time to unbond stake
Slash Fraction (Double Sign)
5%
Penalty for double signing
Slash Fraction (Downtime)
0.1%
Penalty for downtime
Min Signed Per Window
50%
Minimum uptime requirement
EVM Specifications
Compatibility
EVM Version
Pectra
Latest Ethereum upgrades
Solidity
Up to Current
All versions supported
Vyper
✅
Full support
EIP-1559
✅
Base fee mechanism
EIP-2718
✅
Typed transactions
EIP-2930
✅
Access lists
EIP-7702
✅
EOA code (Pectra)
Gas Costs
Transfer
21,000
Standard transfer
Contract Creation
32,000 + code
Base + deployment
SSTORE (new)
20,000
New storage slot
SSTORE (update)
5,000
Existing slot
SLOAD
2,100
Read storage
Memory (per word)
3
Memory expansion
Opcode Support
All standard EVM opcodes are supported, including:
Arithmetic Operations:
ADD, MUL, SUB, DIV, SDIV, MOD, SMOD, ADDMOD, MULMOD, EXP, SIGNEXTEND
Comparison & Bitwise:
LT, GT, SLT, SGT, EQ, ISZERO, AND, OR, XOR, NOT, BYTE, SHL, SHR, SAR
Environmental Information:
ADDRESS, BALANCE, ORIGIN, CALLER, CALLVALUE, CALLDATALOAD, CALLDATASIZE, CALLDATACOPY, CODESIZE, CODECOPY, GASPRICE, EXTCODESIZE, EXTCODECOPY, EXTCODEHASH
Block Information:
BLOCKHASH, COINBASE, TIMESTAMP, NUMBER, DIFFICULTY, GASLIMIT, CHAINID, SELFBALANCE, BASEFEE
Stack, Memory, Storage:
POP, MLOAD, MSTORE, MSTORE8, SLOAD, SSTORE, JUMP, JUMPI, PC, MSIZE, GAS, JUMPDEST
Flow Operations:
STOP, CREATE, CALL, CALLCODE, RETURN, DELEGATECALL, CREATE2, STATICCALL, REVERT, INVALID, SELFDESTRUCT
Precompiled Contracts
0x01
ECDSA Recovery
3000
Signature recovery
0x02
SHA256
60 + 12/word
SHA256 hashing
0x03
RIPEMD160
600 + 120/word
RIPEMD160 hashing
0x04
Identity
15 + 3/word
Data copy
0x05
ModExp
Variable
Modular exponentiation
0x06
ECAdd
150
Elliptic curve addition
0x07
ECMul
6000
Elliptic curve multiplication
0x08
ECPairing
Variable
Elliptic curve pairing
0x09
Blake2f
Variable
Blake2f compression
P2P Network Specifications
Network Parameters
P2P Port
26656
Default P2P port
RPC Port
26657
Tendermint RPC
WS Port
26657
WebSocket endpoint
Max Peers
50
Maximum connections
Persistent Peers
10
Always connected
Seed Mode
Optional
Can run as seed
Message Types
Block
4 MB
Complete block data
Transaction
128 KB
Single transaction
Vote
1 KB
Consensus vote
BlockPart
64 KB
Block fragment
State & Storage Specifications
State Database
DB Backend
LevelDB/RocksDB
Key-value store
State Pruning
Configurable
Keep recent states
History Retention
362,880 blocks
~100 hours
Snapshot Interval
1000 blocks
State sync points
Storage Requirements
Archive Node
~Unknown
~Unknown
Full history
Full Node
~Unknown
~Unknown
Default pruning
Pruned Node
~Unknown
~Unknown
Aggressive pruning
Light Client
~Unknown
~Unknown
Headers only
API Specifications
JSON-RPC Methods
Supported Namespaces:
web3_*- Web3 specific methodsnet_*- Network informationeth_*- Ethereum compatible methodsdebug_*- Debug methods (optional)txpool_*- Transaction pool info
Rate Limits
Public RPC
100 req/s
1 second
Per IP address
Authenticated
1000 req/s
1 second
With API key
WebSocket
100 msg/s
1 second
Per connection
Archive Data
10 req/s
1 second
Historical queries
Response Times
Current State
< 50ms
100ms
Latest data
Recent Blocks
< 100ms
200ms
Last 1000 blocks
Historical
< 500ms
1000ms
Older data
Computation
< 1000ms
5000ms
Complex queries
Security Specifications
Cryptography
ECDSA
Signatures
secp256k1 curve
Keccak-256
Hashing
Ethereum compatible
ED25519
Consensus
Tendermint signatures
SHA-256
Merkle trees
Block hashes
Network Security
DDoS Protection
Rate limiting
Per-IP limits
Sybil Resistance
Proof of Stake
Economic security
Message Authentication
Digital signatures
All messages signed
Transport Security
Optional TLS
For RPC/WS
Performance Specifications
Transaction Throughput
Simple Transfers
10,000+ TPS
21k gas each
ERC-20 Transfers
5,000+ TPS
~65k gas each
Complex DeFi
1,000+ TPS
~300k gas each
Peak Observed
15,000 TPS
Testnet maximum
Latency Specifications
Block Propagation
< 200ms
500ms
Transaction Confirmation
< 2s
5s
State Sync
< 10 min
30 min
RPC Response
< 50ms
100ms
Hardware Specifications
Minimum Requirements
CPU
4 cores
Modern x86_64
RAM
16 GB
32 GB for RocksDB
Storage
500 GB SSD
NVMe preferred
Network
100 Mbps
1 Gbps recommended
OS
Linux/Unix
Ubuntu 20.04+
Recommended Specifications
CPU
8+ cores
High frequency
RAM
32 GB
64 GB for archive
Storage
2 TB NVMe
RAID optional
Network
1 Gbps
Dedicated line
OS
Ubuntu 22.04
Latest LTS
Governance Specifications
Proposal Types
Text
14 days
40%
50%
Parameter Change
14 days
40%
50%
Software Upgrade
14 days
40%
67%
Emergency
24 hours
67%
90%
Voting Power
Based on staked OPN tokens
1 token = 1 vote
Delegated stake counts
No vote buying mechanisms
Future Specifications
Planned Upgrades
Account Abstraction
Q4 2025
EIP-4337 support
ZK Integration
2026
Privacy features
Compatibility Commitments
Maintain full EVM compatibility
Follow Ethereum upgrades
Preserve API compatibility
Support legacy contracts
Last updated