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PWN

1. Summary​

PWN is the main governance token of PWN DAO and is used as a reward for voting in proposals. The token is mintable by PWN DAO, with a hard-cap of 100M $PWN. The total supply can exceed the 100M by minting new $PWN tokens as voting rewards. The token is non-transfarable, but transfers can be enabled by PWN DAO.

3. Contract details​

  • PWN.sol is written in Solidity version 0.8.25

Features​

  • Set voting reward in a voting contract
  • Assign reward to a governance proposal
  • Claim rewards for voters
  • Mint and Burn tokens

Inherited contracts, implemented Interfaces and ERCs​

Functions​

setVotingReward

Overview​

Function to set a reward for voting in a proposal of a voting contract. The reward can be set only by the owner, cannot exceed MAX_VOTING_REWARD (1% of total supply) and it is calculated from the current total supply at the time of assigning the reward. The contract must call assignProposalReward on proposal creation with the new proposal ID.

This function takes two arguments:

  • addressvotingContract
  • uint256votingReward - Voting reward nominator. Passing 0 disables the reward.

Implementation​

function setVotingReward(address votingContract, uint256 votingReward) external onlyOwner {
    if (votingContract == address(0)) {
        revert Error.ZeroVotingContract();
    }
    if (votingReward > MAX_VOTING_REWARD) {
        revert Error.InvalidVotingReward();
    }
    votingRewards[votingContract] = votingReward;

    emit VotingRewardSet(votingContract, votingReward);
}
assignProposalReward

Overview​

Function to assign a reward to a governance proposal.

This function takes one argument:

  • uint256proposalId

Implementation​

function assignProposalReward(uint256 proposalId) external {
    address votingContract = msg.sender;

    // check that the voting contract has a reward set
    uint256 votingReward = votingRewards[votingContract];
    if (votingReward > 0) {
        // check that the proposal reward has not been assigned yet
        ProposalReward storage proposalReward = proposalRewards[votingContract][proposalId];
        if (proposalReward.reward == 0) {
            // assign the reward
            uint256 reward = Math.mulDiv(totalSupply(), votingReward, VOTING_REWARD_DENOMINATOR);
            proposalReward.reward = reward;

            emit ProposalRewardAssigned(votingContract, proposalId, reward);
        }
    }
}
claimProposalReward

Overview​

Function to claims a reward for voting in a proposal. The reward can be claimed only if the caller has voted. It doesn't matter if the caller voted yes, no or abstained.

This function takes two arguments:

  • addressvotingContract
  • uint256proposalId

Implementation​

function claimProposalReward(address votingContract, uint256 proposalId) public {
    if (votingContract == address(0)) {
        revert Error.ZeroVotingContract();
    }

    // check that the reward has been assigned
    ProposalReward storage proposalReward = proposalRewards[votingContract][proposalId];
    uint256 assignedReward = proposalReward.reward;
    if (assignedReward == 0) {
        revert Error.ProposalRewardNotAssigned({ proposalId: proposalId });
    }

    IPWNTokenGovernance _votingContract = IPWNTokenGovernance(votingContract);
    ( // get proposal data
        , bool executed,
        IPWNTokenGovernance.ProposalParameters memory proposalParameters,
        IPWNTokenGovernance.Tally memory tally,,
    ) = _votingContract.getProposal(proposalId);

    // check that the proposal has been executed
    if (!executed) {
        revert Error.ProposalNotExecuted({ proposalId: proposalId });
    }

    // check that the caller has voted
    address voter = msg.sender;
    if (_votingContract.getVoteOption(proposalId, voter) == IPWNTokenGovernance.VoteOption.None) {
        revert Error.CallerHasNotVoted();
    }

    // check that the reward has not been claimed yet
    if (proposalReward.claimed[voter]) {
        revert Error.ProposalRewardAlreadyClaimed({ proposalId: proposalId });
    }

    // store that the reward has been claimed
    proposalReward.claimed[voter] = true;

    // voter is rewarded proportionally to the amount of votes he had in the snapshot epoch
    // it doesn't matter if he voted yes, no or abstained
    uint256 voterVotes = _votingContract.getVotingToken().getPastVotes(voter, proposalParameters.snapshotEpoch);
    uint256 totalVotes = tally.abstain + tally.yes + tally.no;
    uint256 voterReward = Math.mulDiv(assignedReward, voterVotes, totalVotes);

    // mint the reward to the voter
    _mint(voter, voterReward);

    emit ProposalRewardClaimed(votingContract, proposalId, voter, voterReward);
}
claimProposalRewardBatch

Overview​

Function to claims rewards for voting in multiple proposals.

This function takes two arguments:

  • addressvotingContract
  • uint256[] calldataproposalIds

Implementation​

function claimProposalRewardBatch(address votingContract, uint256[] calldata proposalIds) external {
    uint256 length = proposalIds.length;
    for (uint256 i; i < length;) {
        claimProposalReward(votingContract, proposalIds[i]);
        unchecked { ++i; }
    }
}
enableTransfers

Overview​

Function to enable permissionless PWN token transfers. Transfers cannot be disabled once they have been enabled.

This function doesn't take any arguments.

Implementation​

function enableTransfers() external onlyOwner {
    if (transfersEnabled) {
        revert Error.TransfersAlreadyEnabled();
    }
    transfersEnabled = true;
}
setTransferAllowlist

Overview​

Function to enable token transfers for an address before transferes are enabled for all holders.

This function takes two arguments:

  • addressaddr
  • boolisAllowed

Implementation​

function setTransferAllowlist(address addr, bool isAllowed) external onlyOwner {
    transferAllowlist[addr] = isAllowed;
}
mint

Overview​

Function to mint new PWN tokens by PWN DAO. Maximum supply of PWN is capped by MINTABLE_TOTAL_SUPPLY at 100M.

This function takes one argument:

  • uint256amount

Implementation​

function mint(uint256 amount) external onlyOwner {
    if (mintedSupply + amount > MINTABLE_TOTAL_SUPPLY) {
        revert Error.MintableSupplyExceeded();
    }
    unchecked {
        mintedSupply += amount;
    }
    _mint(msg.sender, amount);
}
burn

Overview​

Function to burn PWN tokens.

This function takes one argument:

  • uint256amount

Implementation​

function burn(uint256 amount) external {
    _burn(msg.sender, amount);
}

Events​

event VotingRewardSet(address indexed votingContract, uint256 votingReward);
event ProposalRewardAssigned(address indexed votingContract, uint256 indexed proposalId, uint256 reward);
event ProposalRewardClaimed(address indexed votingContract, uint256 indexed proposalId, address indexed voter, uint256 voterReward);
VotingRewardSet

VotingRewardSet event is emitted when the owner sets the reward for voting in a voting contract.

This event has two parameters:

  • address indexedvotingContract
  • uint256votingReward
ProposalRewardAssigned

ProposalRewardAssigned event is emitted when the owner assigns a reward to a governance proposal.

This event has three parameters:

  • address indexedvotingContract
  • uint256 indexedproposalId
  • uint256reward
ProposalRewardClaimed

ProposalRewardClaimed event is emitted when a voter claims his reward for voting in a proposal.

This event has four parameters:

  • address indexedvotingContract
  • uint256 indexedproposalId
  • address indexedvoter
  • uint256voterReward