Contrat

// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.20;

import { Ownable2Step, Ownable } from "@openzeppelin/contracts/access/Ownable2Step.sol";
import { ReentrancyGuard } from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

interface IStakeManagerRewards {
    function distributeRewards() external payable;
}

/// @title RewardDistributor — QBFT block-reward beneficiary & fee settlement sink
/// @notice This is the `miningbeneficiary` configured in the QBFT genesis: every
///         block the protocol credits it the `blockreward` (the 1.5–2%/yr WTG
///         inflation). It also receives the validator-share of network/app fees.
///
///         Two native inflows are distinguished:
///           • block reward + already-burned fee remainder → arrive via receive(),
///             forwarded 100% to validators (burning inflation would be wrong).
///           • raw transaction fees → arrive via {depositFees}, which marks them
///             so that 20% is burned at settlement (the protocol burn policy).
///
///         At settlement, 20% of the *fee* bucket is burned to 0x…dEaD and the
///         remainder (block reward + 80% fees) is pushed to the StakeManager for
///         pro-rata distribution across the active validator set and delegators.
contract RewardDistributor is Ownable2Step, ReentrancyGuard {
    address public constant BURN_ADDRESS = 0x000000000000000000000000000000000000dEaD;
    uint16 public constant BPS = 10_000;

    IStakeManagerRewards public stakeManager;

    /// @notice Burn rate applied to the fee bucket at settlement (2000 = 20%).
    uint16 public feeBurnBps = 2_000;

    /// @notice Native WTG received as raw fees and pending settlement.
    uint256 public feePending;

    uint256 public totalBlockRewards;
    uint256 public totalFeesIn;
    uint256 public totalBurned;
    uint256 public totalDistributed;

    event BlockRewardReceived(uint256 amount);
    event FeesReceived(address indexed from, uint256 amount);
    event Settled(uint256 burned, uint256 distributed);
    event FeeBurnBpsUpdated(uint16 oldBps, uint16 newBps);
    event StakeManagerUpdated(address indexed stakeManager);

    error ZeroAddress();
    error InvalidBps();
    error NothingToSettle();

    constructor(address stakeManager_, address owner_) Ownable(owner_) {
        if (stakeManager_ == address(0)) revert ZeroAddress();
        stakeManager = IStakeManagerRewards(stakeManager_);
    }

    /// @notice Intake for raw transaction fees subject to the 20% burn.
    ///         Called by the protocol fee router / relayer and by modules that
    ///         forward gas fees here.
    function depositFees() external payable {
        if (msg.value == 0) return;
        feePending += msg.value;
        totalFeesIn += msg.value;
        emit FeesReceived(msg.sender, msg.value);
    }

    /// @notice Settle: burn 20% of the fee bucket, distribute everything else
    ///         (block reward + 80% fees) to validators/delegators.
    function settle() external nonReentrant {
        uint256 bal = address(this).balance;
        if (bal == 0) revert NothingToSettle();

        uint256 burnAmount = (feePending * feeBurnBps) / BPS;
        feePending = 0;
        if (burnAmount > bal) burnAmount = bal; // safety
        uint256 distributable = bal - burnAmount;

        if (burnAmount > 0) {
            totalBurned += burnAmount;
            (bool burned, ) = BURN_ADDRESS.call{ value: burnAmount }("");
            require(burned, "RewardDistributor: burn failed");
        }
        if (distributable > 0) {
            totalDistributed += distributable;
            stakeManager.distributeRewards{ value: distributable }();
        }
        emit Settled(burnAmount, distributable);
    }

    // ----- governance -----

    function setFeeBurnBps(uint16 newBps) external onlyOwner {
        if (newBps > BPS) revert InvalidBps();
        emit FeeBurnBpsUpdated(feeBurnBps, newBps);
        feeBurnBps = newBps;
    }

    function setStakeManager(address sm) external onlyOwner {
        if (sm == address(0)) revert ZeroAddress();
        stakeManager = IStakeManagerRewards(sm);
        emit StakeManagerUpdated(sm);
    }

    /// @dev QBFT block reward (coinbase credit) and forwarded fee remainders land here.
    receive() external payable {
        totalBlockRewards += msg.value;
        emit BlockRewardReceived(msg.value);
    }
}

[
    {
        "type": "constructor",
        "inputs": [
            {
                "name": "stakeManager_",
                "type": "address",
                "internalType": "address"
            },
            {
                "name": "owner_",
                "type": "address",
                "internalType": "address"
            }
        ],
        "stateMutability": "nonpayable"
    },
    {
        "type": "receive",
        "stateMutability": "payable"
    },
    {
        "type": "function",
        "name": "BPS",
        "inputs": [],
        "outputs": [
            {
                "name": "",
                "type": "uint16",
                "internalType": "uint16"
            }
        ],
        "stateMutability": "view"
    },
    {
        "type": "function",
        "name": "BURN_ADDRESS",
        "inputs": [],
        "outputs": [
            {
                "name": "",
                "type": "address",
                "internalType": "address"
            }
        ],
        "stateMutability": "view"
    },
    {
        "type": "function",
        "name": "acceptOwnership",
        "inputs": [],
        "outputs": [],
        "stateMutability": "nonpayable"
    },
    {
        "type": "function",
        "name": "depositFees",
        "inputs": [],
        "outputs": [],
        "stateMutability": "payable"
    },
    {
        "type": "function",
        "name": "feeBurnBps",
        "inputs": [],
        "outputs": [
            {
                "name": "",
                "type": "uint16",
                "internalType": "uint16"
            }
        ],
        "stateMutability": "view"
    },
    {
        "type": "function",
        "name": "feePending",
        "inputs": [],
        "outputs": [
            {
                "name": "",
                "type": "uint256",
                "internalType": "uint256"
            }
        ],
        "stateMutability": "view"
    },
    {
        "type": "function",
        "name": "owner",
        "inputs": [],
        "outputs": [
            {
                "name": "",
                "type": "address",
                "internalType": "address"
            }
        ],
        "stateMutability": "view"
    },
    {
        "type": "function",
        "name": "pendingOwner",
        "inputs": [],
        "outputs": [
            {
                "name": "",
                "type": "address",
                "internalType": "address"
            }
        ],
        "stateMutability": "view"
    },
    {
        "type": "function",
        "name": "renounceOwnership",
        "inputs": [],
        "outputs": [],
        "stateMutability": "nonpayable"
    },
    {
        "type": "function",
        "name": "setFeeBurnBps",
        "inputs": [
            {
                "name": "newBps",
                "type": "uint16",
                "internalType": "uint16"
            }
        ],
        "outputs": [],
        "stateMutability": "nonpayable"
    },
    {
        "type": "function",
        "name": "setStakeManager",
        "inputs": [
            {
                "name": "sm",
                "type": "address",
                "internalType": "address"
            }
        ],
        "outputs": [],
        "stateMutability": "nonpayable"
    },
    {
        "type": "function",
        "name": "settle",
        "inputs": [],
        "outputs": [],
        "stateMutability": "nonpayable"
    },
    {
        "type": "function",
        "name": "stakeManager",
        "inputs": [],
        "outputs": [
            {
                "name": "",
                "type": "address",
                "internalType": "contract IStakeManagerRewards"
            }
        ],
        "stateMutability": "view"
    },
    {
        "type": "function",
        "name": "totalBlockRewards",
        "inputs": [],
        "outputs": [
            {
                "name": "",
                "type": "uint256",
                "internalType": "uint256"
            }
        ],
        "stateMutability": "view"
    },
    {
        "type": "function",
        "name": "totalBurned",
        "inputs": [],
        "outputs": [
            {
                "name": "",
                "type": "uint256",
                "internalType": "uint256"
            }
        ],
        "stateMutability": "view"
    },
    {
        "type": "function",
        "name": "totalDistributed",
        "inputs": [],
        "outputs": [
            {
                "name": "",
                "type": "uint256",
                "internalType": "uint256"
            }
        ],
        "stateMutability": "view"
    },
    {
        "type": "function",
        "name": "totalFeesIn",
        "inputs": [],
        "outputs": [
            {
                "name": "",
                "type": "uint256",
                "internalType": "uint256"
            }
        ],
        "stateMutability": "view"
    },
    {
        "type": "function",
        "name": "transferOwnership",
        "inputs": [
            {
                "name": "newOwner",
                "type": "address",
                "internalType": "address"
            }
        ],
        "outputs": [],
        "stateMutability": "nonpayable"
    },
    {
        "type": "event",
        "name": "BlockRewardReceived",
        "inputs": [
            {
                "name": "amount",
                "type": "uint256",
                "indexed": false,
                "internalType": "uint256"
            }
        ],
        "anonymous": false
    },
    {
        "type": "event",
        "name": "FeeBurnBpsUpdated",
        "inputs": [
            {
                "name": "oldBps",
                "type": "uint16",
                "indexed": false,
                "internalType": "uint16"
            },
            {
                "name": "newBps",
                "type": "uint16",
                "indexed": false,
                "internalType": "uint16"
            }
        ],
        "anonymous": false
    },
    {
        "type": "event",
        "name": "FeesReceived",
        "inputs": [
            {
                "name": "from",
                "type": "address",
                "indexed": true,
                "internalType": "address"
            },
            {
                "name": "amount",
                "type": "uint256",
                "indexed": false,
                "internalType": "uint256"
            }
        ],
        "anonymous": false
    },
    {
        "type": "event",
        "name": "OwnershipTransferStarted",
        "inputs": [
            {
                "name": "previousOwner",
                "type": "address",
                "indexed": true,
                "internalType": "address"
            },
            {
                "name": "newOwner",
                "type": "address",
                "indexed": true,
                "internalType": "address"
            }
        ],
        "anonymous": false
    },
    {
        "type": "event",
        "name": "OwnershipTransferred",
        "inputs": [
            {
                "name": "previousOwner",
                "type": "address",
                "indexed": true,
                "internalType": "address"
            },
            {
                "name": "newOwner",
                "type": "address",
                "indexed": true,
                "internalType": "address"
            }
        ],
        "anonymous": false
    },
    {
        "type": "event",
        "name": "Settled",
        "inputs": [
            {
                "name": "burned",
                "type": "uint256",
                "indexed": false,
                "internalType": "uint256"
            },
            {
                "name": "distributed",
                "type": "uint256",
                "indexed": false,
                "internalType": "uint256"
            }
        ],
        "anonymous": false
    },
    {
        "type": "event",
        "name": "StakeManagerUpdated",
        "inputs": [
            {
                "name": "stakeManager",
                "type": "address",
                "indexed": true,
                "internalType": "address"
            }
        ],
        "anonymous": false
    },
    {
        "type": "error",
        "name": "InvalidBps",
        "inputs": []
    },
    {
        "type": "error",
        "name": "NothingToSettle",
        "inputs": []
    },
    {
        "type": "error",
        "name": "OwnableInvalidOwner",
        "inputs": [
            {
                "name": "owner",
                "type": "address",
                "internalType": "address"
            }
        ]
    },
    {
        "type": "error",
        "name": "OwnableUnauthorizedAccount",
        "inputs": [
            {
                "name": "account",
                "type": "address",
                "internalType": "address"
            }
        ]
    },
    {
        "type": "error",
        "name": "ReentrancyGuardReentrantCall",
        "inputs": []
    },
    {
        "type": "error",
        "name": "ZeroAddress",
        "inputs": []
    }
]

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