FenineSystem Contract - Fenine Network Documentation

Overview

The FenineSystem contract is the heart of Fenines Network’s FPoS (Finality Proof of Stake) consensus. It manages validator registration, staking, delegation, and reward distribution through a unique proximity-based system.

Contract Address: 0x0000000000000000000000000000000000001000 (System Contract)

Architecture

Validator Lifecycle

NOT_EXIST → CREATED → STAKED → VALIDATED → UNSTAKED → CREATED
                ↓         ↓         ↓
           Register   Stake    Activated

NOT_EXIST: Address has never registered
CREATED: Registered with metadata, not yet staked
STAKED: Staked ≥10,000 FEN, waiting for epoch activation
VALIDATED: Active validator, earning rewards
UNSTAKED: Initiated unstake, in lock period

Proximity Reward System

Fenines implements an 8-level proximity (referral) system where:

When a delegator claims rewards, a portion goes to their uplines (previous stakers to the same validator)
Default distribution: 30% of rewards distributed across 8 levels
Per-level allocation: [7%, 5%, 4%, 3.5%, 3%, 2.5%, 2.5%, 2.5%]
Remainder split 50/50 between claimer and validator
Anti-Sybil: Minimum stake requirements increase per level

Epoch System

Epoch Length: 200 blocks (~10 minutes at 3s block time)
System Transactions: Executed automatically at block % 200 == 0
1. updateValidatorCandidates() - Activate STAKED → VALIDATED
2. distributeBlockReward() - Distribute accumulated rewards
Validator Set Updates: Only at epoch boundaries

Constants

Constant	Value	Description
`MAX_VALIDATORS`	101	Maximum active validators
`MIN_VA_STAKE`	10,000 FEN	Minimum validator self-stake
`MIN_DC_STAKE`	1,000 FEN	Minimum delegator stake
`VA_LOCK_PERIOD`	50,000 blocks	~7 days unstake lock
`DC_LOCK_PERIOD`	25,000 blocks	~3.5 days unstake lock
`DEFAULT_COMMISSION`	500 (5%)	Default commission rate
`MAX_COMMISSION`	1000 (10%)	Maximum commission rate
`BLOCK_EPOCH`	200	Blocks per epoch
`PROXIMITY_DEPTH`	8	Proximity levels

Validator Functions

registerValidator

function registerValidator(
    address payable rewardAddress,
    string calldata moniker,
    string calldata phoneNumber,
    string calldata details,
    uint256 commissionRate
) external returns (bool)

address payable

required

Address to receive rewards (can differ from msg.sender)

string

required

Validator name/identifier (1-128 characters)

string

Contact phone number (optional)

string

Additional metadata (optional)

uint256

required

Commission in basis points (500-1000 = 5-10%)

const tx = await systemContract.methods.registerValidator(
  rewardAddress,
  'MyValidator',
  '+1234567890',
  'Best validator in town',
  500 // 5% commission
).send({ from: validatorAddress });

const tx = await systemContract.registerValidator(
  rewardAddress,
  'MyValidator',
  '+1234567890',
  'Best validator in town',
  500
);
await tx.wait();

IFenineSystem(SYSTEM_CONTRACT).registerValidator(
    msg.sender,
    "MyValidator",
    "",
    "",
    500
);

You must register before staking. Status transitions: NOT_EXIST → CREATED

stakeValidator

Stake as validator (minimum 10,000 FEN).

function stakeValidator() external payable returns (bool)

const stakeAmount = web3.utils.toWei('10000', 'ether');

const tx = await systemContract.methods.stakeValidator().send({
  from: validatorAddress,
  value: stakeAmount
});

const tx = await systemContract.stakeValidator({
  value: ethers.parseEther('10000')
});
await tx.wait();

Requirements:

Status must be CREATED or UNSTAKED
msg.value >= 10,000 FEN
Contract not paused

Effects:

Adds to selfStake and totalStake
Status → STAKED
Added to validatorCandidates array
Will be activated at next epoch

addValidatorStake

Add more stake to existing validator (top-up).

function addValidatorStake() external payable returns (bool)

const additionalStake = web3.utils.toWei('5000', 'ether');

await systemContract.methods.addValidatorStake().send({
  from: validatorAddress,
  value: additionalStake
});

Requirements:

Status must be STAKED or VALIDATED
msg.value > 0

Effects:

Increases selfStake and totalStake
Does NOT reset stake age or status

unstakeValidator

Initiate validator unstake process.

function unstakeValidator() external returns (bool)

await systemContract.methods.unstakeValidator().send({
  from: validatorAddress
});

Requirements:

Status must be STAKED or VALIDATED
Not already unstaking

Effects:

Status → UNSTAKED
Sets unstakeBlock = current block
Removed from activeValidatorSet
Removed from validatorCandidates
Lock period: 50,000 blocks (~7 days)

withdrawValidatorStake

Withdraw staked FEN after lock period.

function withdrawValidatorStake() external returns (bool)

await systemContract.methods.withdrawValidatorStake().send({
  from: validatorAddress
});

Requirements:

unstakeBlock > 0 (unstake initiated)
block.number >= unstakeBlock + 50000 (lock period passed)
selfStake > 0

Effects:

Transfers selfStake to validator
Resets selfStake = 0
Status → CREATED
Can re-stake later

claimValidatorReward

Claim accumulated validator rewards.

function claimValidatorReward() external returns (bool)

// Check rewards first
const info = await systemContract.methods.getValidatorInfo(validatorAddress).call();
console.log('Claimable:', web3.utils.fromWei(info.claimableReward, 'ether'), 'FEN');

// Claim
await systemContract.methods.claimValidatorReward().send({
  from: validatorAddress
});

Requirements:

Status must be VALIDATED
claimableReward > 0

Effects:

Transfers rewards to rewardAddress
Applies tax via TaxManager
Resets claimableReward = 0

Tax Flow:

Gross Reward
  ├─> Tax (burn + dev)
  └─> Net → rewardAddress

updateValidatorMetadata

Update validator information.

function updateValidatorMetadata(
    string calldata moniker,
    string calldata phoneNumber,
    string calldata details
) external returns (bool)

await systemContract.methods.updateValidatorMetadata(
  'NewValidatorName',
  '+9876543210',
  'Updated description'
).send({ from: validatorAddress });

updateCommissionRate

Update commission rate (only before activation).

function updateCommissionRate(uint256 newRate) external returns (bool)

await systemContract.methods.updateCommissionRate(750).send({
  from: validatorAddress
}); // Set to 7.5%

Can only update when status is STAKED (not yet activated). Commission is locked after activation.

Delegator Functions

stakeToValidator

Stake FEN to a validator as a delegator.

function stakeToValidator(address vaAddr) external payable returns (bool)

address

required

Validator address to stake to

const validatorAddress = '0x1234...';
const stakeAmount = web3.utils.toWei('1000', 'ether');

await systemContract.methods.stakeToValidator(validatorAddress).send({
  from: delegatorAddress,
  value: stakeAmount
});

const tx = await systemContract.stakeToValidator(validatorAddress, {
  value: ethers.parseEther('1000')
});
await tx.wait();

Requirements:

Validator status must be VALIDATED
msg.value >= 1,000 FEN
Not currently unstaking
Whitelisted via NFTPassport contract

Effects:

First-time: Added to validator’s stakers array (proximity position)
Increases stakeAmount and validator’s totalStake
Starts earning rewards

Proximity Position: Your position in the stakers array determines proximity rewards. Earlier stakers are deeper in the chain and receive rewards from later stakers.

addDelegatorStake

Add more stake to existing delegation.

function addDelegatorStake(address vaAddr) external payable returns (bool)

await systemContract.methods.addDelegatorStake(validatorAddress).send({
  from: delegatorAddress,
  value: web3.utils.toWei('500', 'ether')
});

unstakeDelegator

Initiate delegator unstake process.

function unstakeDelegator(address vaAddr) external returns (bool)

await systemContract.methods.unstakeDelegator(validatorAddress).send({
  from: delegatorAddress
});

Requirements:

stakeAmount > 0
Not already unstaking

Effects:

Removed from stakers array (proximity chain)
Status → UNSTAKING
Sets unstakeBlock = current block
Lock period: 25,000 blocks (~3.5 days)
Pending rewards preserved

withdrawDelegatorStake

Withdraw delegated stake after lock period.

function withdrawDelegatorStake(address vaAddr) external returns (bool)

// Check if lock period passed
const info = await systemContract.methods.getDelegatorInfo(
  delegatorAddress,
  validatorAddress
).call();

const currentBlock = await web3.eth.getBlockNumber();
const lockPeriod = 25000;

if (currentBlock >= info.unstakeBlock + lockPeriod) {
  await systemContract.methods.withdrawDelegatorStake(validatorAddress).send({
    from: delegatorAddress
  });
}

claimDelegatorReward

Claim rewards with proximity distribution.

function claimDelegatorReward(address vaAddr) external returns (bool)

// Estimate rewards first
const estimate = await systemContract.methods.getEstimatedDelegatorReward(
  delegatorAddress,
  validatorAddress
).call();

console.log('Pending:', web3.utils.fromWei(estimate.pending, 'ether'));
console.log('After proximity:', web3.utils.fromWei(estimate.afterProximity, 'ether'));
console.log('After tax:', web3.utils.fromWei(estimate.afterTax, 'ether'));

// Claim
await systemContract.methods.claimDelegatorReward(validatorAddress).send({
  from: delegatorAddress
});

Reward Flow:

Pending Reward (100%)
  ├─> Proximity Distribution (30% default)
  │     ├─> Level 1 upline (7%)
  │     ├─> Level 2 upline (5%)
  │     └─> ... 8 levels
  ├─> Residual split (if uplines ineligible)
  │     ├─> 50% to claimer (bonus)
  │     └─> 50% to validator
  └─> Net to Claimer (70% + bonuses)
        ├─> Tax (burn + dev)
        └─> Final Amount

View Functions

getActiveValidators

Get list of active validators.

function getActiveValidators() external view returns (address[] memory)

const validators = await systemContract.methods.getActiveValidators().call();
console.log('Active validators:', validators);

getValidatorInfo

Get detailed validator information.

function getValidatorInfo(address vaAddr) external view returns (
    VAStatus status,
    uint256 selfStake,
    uint256 totalStake,
    uint256 commissionRate,
    uint256 claimableReward,
    uint256 stakerCount
)

const info = await systemContract.methods.getValidatorInfo(validatorAddress).call();

console.log({
  status: ['NOT_EXIST', 'CREATED', 'STAKED', 'VALIDATED', 'UNSTAKED'][info.status],
  selfStake: web3.utils.fromWei(info.selfStake, 'ether'),
  totalStake: web3.utils.fromWei(info.totalStake, 'ether'),
  commission: info.commissionRate / 100 + '%',
  claimable: web3.utils.fromWei(info.claimableReward, 'ether'),
  delegators: info.stakerCount
});

getDelegatorInfo

Get delegator stake information.

function getDelegatorInfo(address dcAddr, address vaAddr) external view returns (
    DCStatus status,
    uint256 stakeAmount,
    uint256 pendingRewards,
    uint256 joinedAt,
    uint256 stakerIndex
)

getEstimatedDelegatorReward

Calculate estimated rewards (preview before claiming).

function getEstimatedDelegatorReward(address dcAddr, address vaAddr) 
    external view returns (
        uint256 pending,
        uint256 afterProximity,
        uint256 afterTax
    )

getProximityConfig

Get current proximity distribution configuration.

function getProximityConfig() external view returns (
    uint16 totalBps,
    uint8 depth,
    uint16[8] memory rewardBps
)

const config = await systemContract.methods.getProximityConfig().call();

console.log('Total proximity:', config.totalBps / 100, '%');
console.log('Levels:', config.depth);
console.log('Distribution:', config.rewardBps.map(bps => bps / 100 + '%'));

getCurrentEpoch

Get current epoch number.

function getCurrentEpoch() external view returns (uint256)

getNextEpochReward

Get pending reward pool for next epoch.

function getNextEpochReward() external view returns (uint256)

Admin Functions

Admin functions are restricted to the contract admin (set during genesis). These should only be used for emergency situations or governance-approved changes.

setProximityConfig

Update proximity reward distribution.

function setProximityConfig(
    uint16 newTotalBps,
    uint16[8] calldata newRewardBps
) external onlyAdmin returns (bool)

Requirements:

Only admin can call
newTotalBps <= 8700 (87% max)
Array must sum to newTotalBps

pause / unpause

Emergency pause/unpause contract (inherited from EmergencyControl).

function pause() external onlyAdmin
function unpause() external onlyAdmin

changeAdmin

Transfer admin role (inherited from EmergencyControl, with 7-day timelock).

function changeAdmin(address newAdmin) external onlyAdmin

Events

Validator Events

event ValidatorRegistered(address indexed va, string moniker, uint256 timestamp)
event ValidatorStaked(address indexed va, uint256 amount, uint256 totalStake, uint256 timestamp)
event ValidatorActivated(address indexed va, uint256 indexed epochNumber)
event ValidatorUnstaked(address indexed va, uint256 amount, uint256 unlockBlock)
event ValidatorWithdrawn(address indexed va, uint256 amount)
event ValidatorRewardClaimed(address indexed va, uint256 gross, uint256 net, uint256 tax)
event MetadataUpdated(address indexed va)
event CommissionUpdated(address indexed va, uint256 oldRate, uint256 newRate)

Delegator Events

event DelegatorStaked(address indexed dc, address indexed va, uint256 amount, uint256 totalStake, uint256 timestamp)
event DelegatorUnstaked(address indexed dc, address indexed va, uint256 unlockBlock)
event DelegatorWithdrawn(address indexed dc, address indexed va, uint256 amount)
event DelegatorRewardClaimed(address indexed dc, address indexed va, uint256 gross, uint256 net, uint256 tax)

Proximity Events

event ProximityRewardsApplied(address indexed claimer, address indexed va, uint256 totalDistributed)
event ProximityRewardAllocated(address indexed recipient, uint256 amount, uint8 level)

System Events

event RewardDistributed(uint256 epochReward, uint256 validatorCount, uint256 indexed epochNumber, uint256 timestamp)
event ValidatorSetUpdated(address[] validators, uint256 indexed epochNumber)
event EpochProcessed(uint256 indexed blockNumber, address indexed caller, uint256 reward, bool success)

Integration Examples

Become a Validator
Delegate to Validator
Claim Rewards

// Step 1: Register
await systemContract.methods.registerValidator(
  rewardAddress,
  'MyValidator',
  '',
  'Professional validator',
  500
).send({ from: validatorAddress });

// Step 2: Stake (minimum 10,000 FEN)
await systemContract.methods.stakeValidator().send({
  from: validatorAddress,
  value: web3.utils.toWei('10000', 'ether')
});

// Step 3: Wait for next epoch (automatic activation)
// Status will change: CREATED → STAKED → VALIDATED

// Step 4: Monitor rewards
setInterval(async () => {
  const info = await systemContract.methods.getValidatorInfo(validatorAddress).call();
  console.log('Claimable:', web3.utils.fromWei(info.claimableReward, 'ether'));
}, 60000); // Check every minute

// Prerequisites: Get whitelisted via NFTPassport
const nftPassport = new web3.eth.Contract(nftPassportABI, nftPassportAddress);

// Check if whitelisted
const isWhitelisted = await nftPassport.methods.isWhitelisted(
  delegatorAddress,
  validatorAddress
).call();

if (!isWhitelisted) {
  console.log('Need referral key from validator');
  return;
}

// Stake to validator
await systemContract.methods.stakeToValidator(validatorAddress).send({
  from: delegatorAddress,
  value: web3.utils.toWei('1000', 'ether')
});

// Monitor rewards
const estimate = await systemContract.methods.getEstimatedDelegatorReward(
  delegatorAddress,
  validatorAddress
).call();

console.log('Estimated rewards after tax:', 
  web3.utils.fromWei(estimate.afterTax, 'ether'), 'FEN'
);

// For Validators
const vaInfo = await systemContract.methods.getValidatorInfo(validatorAddress).call();
if (BigInt(vaInfo.claimableReward) > 0) {
  await systemContract.methods.claimValidatorReward().send({
    from: validatorAddress
  });
}

// For Delegators
const dcEstimate = await systemContract.methods.getEstimatedDelegatorReward(
  delegatorAddress,
  validatorAddress
).call();

if (BigInt(dcEstimate.pending) > 0) {
  await systemContract.methods.claimDelegatorReward(validatorAddress).send({
    from: delegatorAddress
  });
}

Security Considerations

Reentrancy Protection

All state-changing functions that transfer ETH use the nonReentrant modifier to prevent reentrancy attacks.

Access Control

User functions: Anyone can call
System functions: Only block.coinbase (consensus layer)
Admin functions: Only contract admin with timelock

Anti-Sybil

Minimum stake requirements per proximity level prevent sybil attacks
Stake age requirement (100 blocks minimum)
Unstaking addresses cannot receive proximity rewards

Emergency Controls

Pause functionality (inherited from EmergencyControl)
7-day timelock for admin changes
Emergency withdrawal capability with hooks

Next Steps

NFT Passport Contract

Whitelist and referral system

Tax Manager Contract

Reward tax and burn mechanism

Integration Examples

Complete integration examples

Quick Reference

Common queries and selectors

​Overview

​Architecture

​Constants

​Validator Functions

​registerValidator

​stakeValidator

​addValidatorStake

​unstakeValidator

​withdrawValidatorStake

​claimValidatorReward

​updateValidatorMetadata

​updateCommissionRate

​Delegator Functions

​stakeToValidator

​addDelegatorStake

​unstakeDelegator

​withdrawDelegatorStake

​claimDelegatorReward

​View Functions

​getActiveValidators

​getValidatorInfo

​getDelegatorInfo

​getEstimatedDelegatorReward

​getProximityConfig

​getCurrentEpoch

​getNextEpochReward

​Admin Functions

​setProximityConfig

​pause / unpause

​changeAdmin

​Events

​Integration Examples

​Security Considerations

​Next Steps

NFT Passport Contract

Tax Manager Contract

Integration Examples

Quick Reference

Overview

Architecture

Constants

Validator Functions

registerValidator

stakeValidator

addValidatorStake

unstakeValidator

withdrawValidatorStake

claimValidatorReward

updateValidatorMetadata

updateCommissionRate

Delegator Functions

stakeToValidator

addDelegatorStake

unstakeDelegator

withdrawDelegatorStake

claimDelegatorReward

View Functions

getActiveValidators

getValidatorInfo

getDelegatorInfo

getEstimatedDelegatorReward

getProximityConfig

getCurrentEpoch

getNextEpochReward

Admin Functions

setProximityConfig

pause / unpause

changeAdmin

Events

Integration Examples

Security Considerations

Next Steps