WAHT-Based Voting Power System

Description

This smart contract implements a Voting Power System based on the concept of Weighted Average Holding Time (WAHT). The system dynamically calculates a user’s voting power using:

• Token Balance (B): The number of tokens held by the user.
• Holding Duration (T): The length of time for which those tokens have been held.

By combining these factors, the system achieves a more equitable voting power distribution. The design is highly gas-optimized through the use of packed storage for balance and timestamp data, reducing operational complexity and costs. Unlike traditional snapshot-based mechanisms, WAHT eliminates the need for redundant state storage by dynamically calculating voting power in real time, ensuring instantaneous updates with minimal computational overhead.

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Usage

Features

• Dynamic Voting Power Calculation: Merges balance and holding duration to dynamically compute voting power in real time.
• Gas Optimization: Implements advanced bit-level operations to compress storage usage and minimize on-chain operations.
• View-Only Voting Power Query: Provides state-independent computations for user queries.
• Snapshot-Free Mechanism: Foregoes reliance on snapshot data, mitigating historical storage bloat.
• Seamless Integration: Designed for easy incorporation into governance and DAO systems.

Core Concept

The WAHT system increments a user’s holding time based on the formula:

[ T_{total} = T_{previous} + (B \times \Delta t) ]

Where:

• (T_{total}) = Total accumulated holding time.
• (B) = Token balance at the last update.
• (\Delta t) = Time elapsed since the last update.

This mechanism ensures that voting power grows proportionally to both balance and time, rewarding long-term token holders.

Gas Optimization Techniques

1. Packed Storage for Data Compression

The system leverages a single 256-bit storage slot to store two key variables:

• 128 bits: Token balance.
• 64 bits: Last update timestamp.

This reduces the cost of storage reads/writes by consolidating data into a single storage access operation, avoiding additional SLOAD or SSTORE calls.

2. Unchecked Arithmetic Operations

By employing Solidity’s unchecked keyword, the contract minimizes redundant gas-consuming overflow checks in scenarios where bounds are inherently controlled.

3. Batch Logical Operations

Bit-shifting and masking techniques are utilized to pack/unpack data efficiently:

uint128 balance = uint128(packedData >> 64);
uint64 lastUpdate = uint64(packedData);

These operations avoid the need for explicit storage segmentation, enabling efficient in-memory manipulations.

4. Selective State Updates

State is updated only when necessary—e.g., during balance changes. This ensures that no unnecessary writes occur, thereby conserving gas:

if (newBalance != balance) {
    holding.packedData = (uint256(uint128(newBalance)) << 64) | currentTimestamp;
}

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Functions

updateWAHT

function updateWAHT(address account, uint256 newBalance) external

Purpose: Updates the Weighted Average Holding Time (WAHT) for a user whenever their balance changes.

• Parameters:
  • account: Address of the user whose WAHT is being updated.
  • newBalance: The updated token balance for the user.
• Logic:
  • Calculates (\Delta t) (time elapsed since the last update).
  • Updates the user’s (T_{total}) based on their balance and (\Delta t).
  • Packs the updated balance and timestamp back into the storage slot.

getVotingPower

function getVotingPower(address account) external view returns (uint256)

Purpose: Computes the real-time voting power for a user.

• Parameters:
  • account: Address of the user whose voting power is being queried.
• Returns:
  • Voting power derived from (T_{total}).
• Logic:
  • Extracts balance and timestamp from packed data.
  • Calculates accrued holding time since the last update.
  • Normalizes (T_{total}) to compute voting power.

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Example Integration with ERC-20

The WAHT mechanism is designed for direct integration into ERC-20 tokens. Below is an implementation that demonstrates its integration within the _transfer function.

Example ERC-20 Token: exampleERC20Token

contract exampleERC20Token is IERC20 {
    VotingPower public votingPowerContract;

    constructor(address votingPowerAddress) {
        votingPowerContract = VotingPower(votingPowerAddress);
    }

    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "Transfer from the zero address");
        require(recipient != address(0), "Transfer to the zero address");

        _balances[sender] -= amount;
        _balances[recipient] += amount;

        // Update WAHT balances in VotingPower contract
        votingPowerContract.updateWAHT(sender, _balances[sender]);
        votingPowerContract.updateWAHT(recipient, _balances[recipient]);

        emit Transfer(sender, recipient, amount);
    }
}

Key Integration Details

• Real-Time WAHT Updates: Automatically updates both sender and recipient balances within the VotingPower contract during each transfer.
• Efficient Data Handling: Leverages the gas-optimized packed storage format of VotingPower.
• Dynamic Voting Power Calculation: Ensures accurate, real-time voting power adjustments without historical dependencies.
• Snapshot-Free Mechanism: Bypasses the inefficiencies of snapshot-based governance models, relying instead on real-time recalculations.

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Deployment and Usage

Prerequisites

• Solidity Compiler: Version 0.8.20 or higher.
• Ethereum Network: Compatible with any EVM-based blockchain.

Steps to Deploy

1. Clone the repository.
2. Compile the contracts using Hardhat, Truffle, or Remix.
3. Deploy the VotingPower contract.
4. Deploy your ERC-20 contract with the VotingPower contract address.

Example Interaction

Update WAHT

votingPower.updateWAHT(userAddress, newBalance);

• Example:

  votingPower.updateWAHT(0x123...abc, 500);

Get Voting Power

uint256 power = votingPower.getVotingPower(userAddress);

• Example:

  uint256 power = votingPower.getVotingPower(0x123...abc);

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Advanced Gas Optimization Notes

• Single Slot Design: By consolidating balance and timestamp into a single storage slot, the contract reduces SLOAD and SSTORE operations, saving approximately 5,000 gas per state interaction compared to dual-slot designs.
• Lazy Updates: Voting power is computed lazily during view operations, minimizing on-chain computations during state-modifying calls.
• Arithmetic Compression: Operations on balances and timestamps utilize bitwise operations to reduce computational overhead, achieving theoretical gas efficiency bounds.

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Use Cases

• DAOs: Implements fair voting power allocation based on token holding behavior.
• Incentive Systems: Encourages long-term holding through time-weighted rewards.
• Governance Systems: Provides equitable and dynamic voting systems, removing the dependency on static snapshots.

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License

This project is licensed under the MIT License.

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Acknowledgments

• Developed with a focus on reducing gas costs and enabling fair governance mechanisms.
• Inspired by advanced tokenomics and governance models in DeFi.

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