Contract 0x6c021Ae822BEa943b2E66552bDe1D2696a53fbB7 6

Txn Hash Method
Block
From
To
Value [Txn Fee]
0xda22d929ddd768d2c595622b482b36bc29b44a4c050980c2173e2fe000b3f620Approve385940622022-05-19 15:42:5011 mins ago0x0ceb0925f1feb9d357cf5308c1e76c959bfe677f IN  Tomb Finance: TOMB Token0 FTM0.036806081851
0x3ff84ef49446ab045fc6341f5dfcfc771913988502483b499afc59931e04e551Approve385938772022-05-19 15:38:3815 mins ago0xb6df546f1154169bee7096da5954b90e22d50970 IN  Tomb Finance: TOMB Token0 FTM0.0156394713
0x140d7851793eeb1c2b3eff3211b8efa5e1e05a4b657cc9cb6b7051ca1b5b70b6Approve385938712022-05-19 15:38:2716 mins ago0xfe5bab72af1aea76aabc28562e584e59d2708196 IN  Tomb Finance: TOMB Token0 FTM0.01428314758
0x60ea8cd1dba60e8260b8b7774b72600e72d6f6613462102830323a80690998b5Approve385936342022-05-19 15:32:4821 mins ago0xb6df546f1154169bee7096da5954b90e22d50970 IN  Tomb Finance: TOMB Token0 FTM0.011367382554
0x8bed694c61e4547207385438eb12790d00c65dd8f15a8eafbcb4791b86131b86Approve385935592022-05-19 15:31:3622 mins ago0x6ef06c7caef8022fc44e462821fca1200e92a891 IN  Tomb Finance: TOMB Token0 FTM0.006428683151
0xd1f7424dd17c332ab86b9c36a395724c1db274ddf16ff7ff1b06ab9649796193Approve385935292022-05-19 15:30:5223 mins ago0x6ef06c7caef8022fc44e462821fca1200e92a891 IN  Tomb Finance: TOMB Token0 FTM0.012506585756
0x83f0cfbd31c12dadce8afdeb75c2c45aad73917b307e06ef447a774a1dc1c212Approve385935132022-05-19 15:30:3024 mins ago0x13d9f725d61e9bb4cf72156c42e46bc27aa00b34 IN  Tomb Finance: TOMB Token0 FTM0.011905179369
0x1aa6c31c357b56b55d6e660d68c87275848f63fef8dc027cd021e0947addaab0Approve385934662022-05-19 15:29:2625 mins ago0xa1f290af8d29024fd64c3fd6cfcc545d2255deb1 IN  Tomb Finance: TOMB Token0 FTM0.010903392284
0x350bab8b66c99653c455b7f17cf3095d7641949d2d9c886e9e2effe0961fb4eeApprove385932942022-05-19 15:26:0428 mins ago0x27ef9702c07b4fa575e911f9828e0b289be12b3b IN  Tomb Finance: TOMB Token0 FTM0.011603328457
0x59c70561a8704a310dc781fdd620d8c979f6a342cfae5e748644ae7258fe5ab3Approve385932022022-05-19 15:23:3431 mins ago0x05a67eafa71ae3d6148e09622ba3c2bc9e0f4403 IN  Tomb Finance: TOMB Token0 FTM0.009000688358
0x9e78b368ea671d1e4119df1ce6ca7bbe473ff402bcec2a8ac7b3f9352ee75e55Approve385931522022-05-19 15:22:3432 mins ago0xc8cc1fdb963ad0f144bff692d46f6afad4c00592 IN  Tomb Finance: TOMB Token0 FTM0.009585992417
0x3d007d12a36971d79b85ae847f95f42280555a8b2347ab9cc6b3ec15eacadec2Approve385930282022-05-19 15:20:2734 mins ago0x50fdf9ecb05c606696baccfdc8cf84ebf0443a1d IN  Tomb Finance: TOMB Token0 FTM0.009647223964
0x18a9887e52337fee8cafb044d1fe6cdf497fc1cd960121e01fc51365475ce615Approve385928662022-05-19 15:16:4937 mins ago0x9dfee27bb266f01575b307271a0bb61d7e36e62b IN  Tomb Finance: TOMB Token0 FTM0.009645300652
0x2234ea39e0d4d7edfb7b08592e5abd236ea5137207ac1876ebb7b03ebf455473Approve385925972022-05-19 15:11:5042 mins ago0xc4b631f585bc46cf33a56c3fba5ddd4d3b36d403 IN  Tomb Finance: TOMB Token0 FTM0.010749135772
0xeba48c7ed8ce658fd40bbe5728845435b94fc973f663cc09f4eb329b1981b079Approve385925002022-05-19 15:09:5344 mins ago0xa5a43729a2320a4d44db2b571fbb5a48d618d903 IN  Tomb Finance: TOMB Token0 FTM0.0117425
0x97162ca56dee04e2f332b4dd28b079815151ded2e24788d6b0d30efa186d1f1cApprove385922972022-05-19 15:06:0848 mins ago0xc8cc1fdb963ad0f144bff692d46f6afad4c00592 IN  Tomb Finance: TOMB Token0 FTM0.010466749228
0xa6444a32ebde4587d40dbcc97501ff6a4d0d32280c3cbef466a4949488241db5Approve385921982022-05-19 15:04:2750 mins ago0x6038e5f9697f4c5b39274fc7a93ee0f7069a07db IN  Tomb Finance: TOMB Token0 FTM0.010793480646
0x7468a157d681ad8bdc71b1a1187bd3d063f116b50dbab40cefb76ec311aa699bApprove385919612022-05-19 15:00:4253 mins ago0xf94af2818ab504b1fbdced5bb0703a210d68e3fe IN  Tomb Finance: TOMB Token0 FTM0.011511384768
0x3cfeabafcacfd4aac297e1603579b06b82dcae2bfd9288660656076f60047c4dApprove385915582022-05-19 14:53:181 hr 1 min ago0x5e8f0e72d895dff16c5bf76228b9f4a32ea3eed6 IN  Tomb Finance: TOMB Token0 FTM0.011702904751
0x98fbc6c9bedfaf1288fe29987094eb5beaddae88be957522f82591bbd8e6a783Approve385915282022-05-19 14:52:441 hr 1 min ago0x2d380ea52c9243513807a95f4380b1b49e3ca0fe IN  Tomb Finance: TOMB Token0 FTM0.011727846145
0x2b820813a841fe10d198045b2380e3d970d7c01a3e4ea78c38140f8791a2e3f4Approve385913182022-05-19 14:48:511 hr 5 mins ago0xafb20573ca4665b86e652e9eb93fda22f448ffa9 IN  Tomb Finance: TOMB Token0 FTM0.012554036965
0x8266b5a16e4e4f876c8594dcb67b8600e15fd247417f5ced42097f16cd5fe552Approve385913172022-05-19 14:48:491 hr 5 mins ago0x9a0519e68974e99f0accbba8d19e1eca53e4d14a IN  Tomb Finance: TOMB Token0 FTM0.012686610876
0x65b51803e2abef602051d062e01bc5ccb2807e542a3cfa936d8a79de7e447aeaApprove385911342022-05-19 14:45:391 hr 8 mins ago0xd02364b9ee5f21c5cf4e346c093e8ccde32f57c0 IN  Tomb Finance: TOMB Token0 FTM0.01359432565
0xc59b3158aea6228c4e27584e636ac74a33c7d536dcc75832f6f8adc3dcb54a70Approve385910242022-05-19 14:43:381 hr 10 mins ago0x27667ac10ca637448ed6cdae46ebb8347bfa6b34 IN  Tomb Finance: TOMB Token0 FTM0.016615104
0x971b87acffb044458148479a0b3538ecefd79bfd023abee2fa581e39223df921Approve385907492022-05-19 14:38:571 hr 15 mins ago0xd22ed5700bac2cb05950538822d1a8944e8278be IN  Tomb Finance: TOMB Token0 FTM0.009668526314
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OVERVIEW

An algorithmic stablecoin on Fantom Opera, pegged to the price of 1 FTM via seigniorage.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0xbec79ed76401b9bcf644f8505bf0aaa4cdac7bd29cb8bf7ee3da1796f50e8e40358948002022-04-12 17:44:5336 days 22 hrs ago 0x45b10aabc7a16b6c1b908c3421f31c159e74d80c Tomb Finance: TOMB Token0.1 FTM
0xd80c4fd1d95be87d7f9f56b7c732477f45d6a3003f473d310db182d8590331dd333378932022-03-13 18:33:3066 days 21 hrs ago 0x91b6853ae35bb14a5f246f8664bd7df82f58d663 Tomb Finance: TOMB Token1 FTM
0x6f60c72378ac466ac50554a25c97b65b6b50e1877ef2e1347a8c7beef348be7e319562922022-02-25 19:35:1482 days 20 hrs ago 0xab7c04f1f259a7acda350b1ce7c184981db5e707 Tomb Finance: TOMB Token6.5 FTM
0xadefa137ab49346c142aa57105871674c62f91dbfc41d48f281aa34a5c8c3330319561532022-02-25 19:32:3182 days 20 hrs ago 0xab7c04f1f259a7acda350b1ce7c184981db5e707 Tomb Finance: TOMB Token6.5 FTM
0x6fb87fe2168515acee61e53b5b1b80efec6a59477b92865cafcdb9ce9686eb25319464722022-02-25 16:25:5182 days 23 hrs ago 0x0477455e0e65928b993ba49bbbd5ce8d434fe1d2 Tomb Finance: TOMB Token305 FTM
0xdb8678c1bf664986aa144fe5b4ace6421085651bddc8083fa7549956c14bdb54319464242022-02-25 16:24:5282 days 23 hrs ago 0x0477455e0e65928b993ba49bbbd5ce8d434fe1d2 Tomb Finance: TOMB Token305 FTM
0xd53ecedaeeff891bc9193e4c42527b642ab6ca30c593f7bedd466805fe6487cb319463772022-02-25 16:23:3782 days 23 hrs ago 0x0477455e0e65928b993ba49bbbd5ce8d434fe1d2 Tomb Finance: TOMB Token305 FTM
0x8ba4d7d034abfcf3c23b470d8bd4bb995bcf48ff54f9722c78c057c902cb2cc8298693002022-02-03 10:26:52105 days 5 hrs ago 0xebf4fbb9c81b84dd5cf89bc75588e5d0018501b3 Tomb Finance: TOMB Token9.99 FTM
0x8a670bf09f5aa3e0f9dcb39fd79cfaf78507e096e31148206ae788be57635dce292906192022-01-28 14:23:14111 days 1 hr ago 0xad78c7311f22647d488dc6695836cab58650eb3c Tomb Finance: TOMB Token149.99 FTM
0x8793960bd17ad77f24807bc4000a90be6730c28ab0acb59597c69d8e98b53955285911172022-01-20 23:58:25118 days 15 hrs ago 0x2e691be58fe5166ac25d8aa7c83b798b7410028f Tomb Finance: TOMB Token8 FTM
0xc49c59146fe24bc77e669d303eab70aa4674c37c9e6a1f949a7633b2577d7749285539042022-01-20 15:06:16119 days 48 mins ago 0x07dac2180457577773d17d162e06685f627bea85 Tomb Finance: TOMB Token1 FTM
0x892a519252092e4b1aa7cd0cb1f5c552feceff4f62657644089fe3811a83c7fa267167882022-01-01 23:52:26137 days 16 hrs ago 0xebf4fbb9c81b84dd5cf89bc75588e5d0018501b3 Tomb Finance: TOMB Token4.99 FTM
0x7782c1a182568ff361ff3b0e0c4ee8c160a8b7bb7c3a53a3f1728a4325e7574f266052362021-12-31 19:50:03138 days 20 hrs ago 0xb4782f71291535a123bc072e33b150c375f17a6c Tomb Finance: TOMB Token2 FTM
0x6777a9711d704d360c94820d557a1b98349feaa94c264c2217e5df84602399ba264572072021-12-30 6:38:55140 days 9 hrs ago 0xd47b73b1e3fbd06cf6d9992d02a46eb7245641bf Tomb Finance: TOMB Token3 FTM
0xff67e50bb699ee41306f7577e6e9344c2f71f902480a6c4b968dbe3da1e12c3d260933222021-12-26 12:35:28144 days 3 hrs ago 0xebf4fbb9c81b84dd5cf89bc75588e5d0018501b3 Tomb Finance: TOMB Token0.99 FTM
0xfd68679010dcdcc21e04e3fbb1085c912a50902d32b01f1cbb3a2cc0ba7bb280236631352021-12-01 9:52:30169 days 6 hrs ago 0xebf4fbb9c81b84dd5cf89bc75588e5d0018501b3 Tomb Finance: TOMB Token14.99 FTM
0xc5ef44f8fbc8ff8a750077d74e14b816f88d28ae08d6dcd40a72ac65647da1e0235730302021-11-30 12:15:57170 days 3 hrs ago 0xebf4fbb9c81b84dd5cf89bc75588e5d0018501b3 Tomb Finance: TOMB Token32.19787182 FTM
0x9e0ec52888f91b510a2921b5cbf5fe273e134b572a14d6ad64bf11febec6ec83227589682021-11-22 2:33:26178 days 13 hrs ago 0x6da25f13cc1a711b031ef79c4db3a79d49b27c2b Tomb Finance: TOMB Token1 FTM
0x3b6066be3812766450ed1a88fcf2d501c7ce74f28bbf768d095aff30a7e5f53a213974512021-11-08 1:36:28192 days 14 hrs ago 0xebf4fbb9c81b84dd5cf89bc75588e5d0018501b3 Tomb Finance: TOMB Token39.99 FTM
0x5e6521c3b6cc50b7c7eaabeda7b05f9f540321dc45c4c82d955c6d055574c4a0197385912021-10-22 6:09:30209 days 9 hrs ago 0xb2bc628fcf119d3e6e0ca4de856c734806246954 Tomb Finance: TOMB Token10 FTM
0x1127c833ccde21c50998e1aad9314dc22219919615bdb443214f862c98c618b7197384782021-10-22 6:07:54209 days 9 hrs ago 0xb2bc628fcf119d3e6e0ca4de856c734806246954 Tomb Finance: TOMB Token2 FTM
0x5b3f8b6edc8213e7b21170184cf02c88b9003071d4e688a7ba51cbac6335981b189549882021-10-12 23:49:56218 days 16 hrs ago 0x9363df1cfdfcd2d2839bf8c1d6737d4611e6d08a Tomb Finance: TOMB Token1 FTM
0xc796df728c9c07db38b7806da38752ec109d27d7efd5632033fe807b79a1ed41178557442021-09-28 9:56:16233 days 5 hrs ago 0x725d97056e51ceabcb16ba806e597791706498b2 Tomb Finance: TOMB Token2.984985368 FTM
0x0bb50ce8bc0957810ee36320d1b50fba21588ac93231c60ca0816ab260b1b22b84788072021-06-01 7:35:54352 days 8 hrs ago 0x8162c739a3989d4b4213d5002f6ae7cfed5f04fe Tomb Finance: TOMB Token900.283112095903512065 FTM
0x88725502d14c4080a3ee6de5d147b31af59c4f3be1d7be7546d165a65385134e83061802021-05-30 22:31:52353 days 17 hrs ago Tomb Finance: Deployer  Contract Creation0 FTM
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Contract Source Code Verified (Exact Match)

Contract Name:
Tomb

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 999999 runs

Other Settings:
default evmVersion
File 1 of 12 : Tomb.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import "@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol";
import "@openzeppelin/contracts/math/Math.sol";

import "./lib/SafeMath8.sol";
import "./owner/Operator.sol";
import "./interfaces/IOracle.sol";

/*
  ______                __       _______
 /_  __/___  ____ ___  / /_     / ____(_)___  ____ _____  ________
  / / / __ \/ __ `__ \/ __ \   / /_  / / __ \/ __ `/ __ \/ ___/ _ \
 / / / /_/ / / / / / / /_/ /  / __/ / / / / / /_/ / / / / /__/  __/
/_/  \____/_/ /_/ /_/_.___/  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/

    http://tomb.finance
*/
contract Tomb is ERC20Burnable, Operator {
    using SafeMath8 for uint8;
    using SafeMath for uint256;

    // Initial distribution for the first 24h genesis pools
    uint256 public constant INITIAL_GENESIS_POOL_DISTRIBUTION = 11000 ether;
    // Initial distribution for the day 2-5 TOMB-WFTM LP -> TOMB pool
    uint256 public constant INITIAL_TOMB_POOL_DISTRIBUTION = 140000 ether;
    // Distribution for airdrops wallet
    uint256 public constant INITIAL_AIRDROP_WALLET_DISTRIBUTION = 9000 ether;

    // Have the rewards been distributed to the pools
    bool public rewardPoolDistributed = false;

    /* ================= Taxation =============== */
    // Address of the Oracle
    address public tombOracle;
    // Address of the Tax Office
    address public taxOffice;

    // Current tax rate
    uint256 public taxRate;
    // Price threshold below which taxes will get burned
    uint256 public burnThreshold = 1.10e18;
    // Address of the tax collector wallet
    address public taxCollectorAddress;

    // Should the taxes be calculated using the tax tiers
    bool public autoCalculateTax;

    // Tax Tiers
    uint256[] public taxTiersTwaps = [0, 5e17, 6e17, 7e17, 8e17, 9e17, 9.5e17, 1e18, 1.05e18, 1.10e18, 1.20e18, 1.30e18, 1.40e18, 1.50e18];
    uint256[] public taxTiersRates = [2000, 1900, 1800, 1700, 1600, 1500, 1500, 1500, 1500, 1400, 900, 400, 200, 100];

    // Sender addresses excluded from Tax
    mapping(address => bool) public excludedAddresses;

    event TaxOfficeTransferred(address oldAddress, address newAddress);

    modifier onlyTaxOffice() {
        require(taxOffice == msg.sender, "Caller is not the tax office");
        _;
    }

    modifier onlyOperatorOrTaxOffice() {
        require(isOperator() || taxOffice == msg.sender, "Caller is not the operator or the tax office");
        _;
    }

    /**
     * @notice Constructs the TOMB ERC-20 contract.
     */
    constructor(uint256 _taxRate, address _taxCollectorAddress) public ERC20("TOMB", "TOMB") {
        // Mints 1 TOMB to contract creator for initial pool setup
        require(_taxRate < 10000, "tax equal or bigger to 100%");
        require(_taxCollectorAddress != address(0), "tax collector address must be non-zero address");

        excludeAddress(address(this));

        _mint(msg.sender, 1 ether);
        taxRate = _taxRate;
        taxCollectorAddress = _taxCollectorAddress;
    }

    /* ============= Taxation ============= */

    function getTaxTiersTwapsCount() public view returns (uint256 count) {
        return taxTiersTwaps.length;
    }

    function getTaxTiersRatesCount() public view returns (uint256 count) {
        return taxTiersRates.length;
    }

    function isAddressExcluded(address _address) public view returns (bool) {
        return excludedAddresses[_address];
    }

    function setTaxTiersTwap(uint8 _index, uint256 _value) public onlyTaxOffice returns (bool) {
        require(_index >= 0, "Index has to be higher than 0");
        require(_index < getTaxTiersTwapsCount(), "Index has to lower than count of tax tiers");
        if (_index > 0) {
            require(_value > taxTiersTwaps[_index - 1]);
        }
        if (_index < getTaxTiersTwapsCount().sub(1)) {
            require(_value < taxTiersTwaps[_index + 1]);
        }
        taxTiersTwaps[_index] = _value;
        return true;
    }

    function setTaxTiersRate(uint8 _index, uint256 _value) public onlyTaxOffice returns (bool) {
        require(_index >= 0, "Index has to be higher than 0");
        require(_index < getTaxTiersRatesCount(), "Index has to lower than count of tax tiers");
        taxTiersRates[_index] = _value;
        return true;
    }

    function setBurnThreshold(uint256 _burnThreshold) public onlyTaxOffice returns (bool) {
        burnThreshold = _burnThreshold;
    }

    function _getTombPrice() internal view returns (uint256 _tombPrice) {
        try IOracle(tombOracle).consult(address(this), 1e18) returns (uint144 _price) {
            return uint256(_price);
        } catch {
            revert("Tomb: failed to fetch TOMB price from Oracle");
        }
    }

    function _updateTaxRate(uint256 _tombPrice) internal returns (uint256){
        if (autoCalculateTax) {
            for (uint8 tierId = uint8(getTaxTiersTwapsCount()).sub(1); tierId >= 0; --tierId) {
                if (_tombPrice >= taxTiersTwaps[tierId]) {
                    require(taxTiersRates[tierId] < 10000, "tax equal or bigger to 100%");
                    taxRate = taxTiersRates[tierId];
                    return taxTiersRates[tierId];
                }
            }
        }
    }

    function enableAutoCalculateTax() public onlyTaxOffice {
        autoCalculateTax = true;
    }

    function disableAutoCalculateTax() public onlyTaxOffice {
        autoCalculateTax = false;
    }

    function setTombOracle(address _tombOracle) public onlyOperatorOrTaxOffice {
        require(_tombOracle != address(0), "oracle address cannot be 0 address");
        tombOracle = _tombOracle;
    }

    function setTaxOffice(address _taxOffice) public onlyOperatorOrTaxOffice {
        require(_taxOffice != address(0), "tax office address cannot be 0 address");
        emit TaxOfficeTransferred(taxOffice, _taxOffice);
        taxOffice = _taxOffice;
    }

    function setTaxCollectorAddress(address _taxCollectorAddress) public onlyTaxOffice {
        require(_taxCollectorAddress != address(0), "tax collector address must be non-zero address");
        taxCollectorAddress = _taxCollectorAddress;
    }

    function setTaxRate(uint256 _taxRate) public onlyTaxOffice {
        require(!autoCalculateTax, "auto calculate tax cannot be enabled");
        require(_taxRate < 10000, "tax equal or bigger to 100%");
        taxRate = _taxRate;
    }

    function excludeAddress(address _address) public onlyOperatorOrTaxOffice returns (bool) {
        require(!excludedAddresses[_address], "address can't be excluded");
        excludedAddresses[_address] = true;
        return true;
    }

    function includeAddress(address _address) public onlyOperatorOrTaxOffice returns (bool) {
        require(excludedAddresses[_address], "address can't be included");
        excludedAddresses[_address] = false;
        return true;
    }

    /**
     * @notice Operator mints TOMB to a recipient
     * @param recipient_ The address of recipient
     * @param amount_ The amount of TOMB to mint to
     * @return whether the process has been done
     */
    function mint(address recipient_, uint256 amount_) public onlyOperator returns (bool) {
        uint256 balanceBefore = balanceOf(recipient_);
        _mint(recipient_, amount_);
        uint256 balanceAfter = balanceOf(recipient_);

        return balanceAfter > balanceBefore;
    }

    function burn(uint256 amount) public override {
        super.burn(amount);
    }

    function burnFrom(address account, uint256 amount) public override onlyOperator {
        super.burnFrom(account, amount);
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public override returns (bool) {
        uint256 currentTaxRate = 0;
        bool burnTax = false;

        if (autoCalculateTax) {
            uint256 currentTombPrice = _getTombPrice();
            currentTaxRate = _updateTaxRate(currentTombPrice);
            if (currentTombPrice < burnThreshold) {
                burnTax = true;
            }
        }


        if (currentTaxRate == 0 || excludedAddresses[sender]) {
            _transfer(sender, recipient, amount);
        } else {
            _transferWithTax(sender, recipient, amount, burnTax);
        }

        _approve(sender, _msgSender(), allowance(sender, _msgSender()).sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function _transferWithTax(
        address sender,
        address recipient,
        uint256 amount,
        bool burnTax
    ) internal returns (bool) {
        uint256 taxAmount = amount.mul(taxRate).div(10000);
        uint256 amountAfterTax = amount.sub(taxAmount);

        if(burnTax) {
            // Burn tax
            super.burnFrom(sender, taxAmount);
        } else {
            // Transfer tax to tax collector
            _transfer(sender, taxCollectorAddress, taxAmount);
        }

        // Transfer amount after tax to recipient
        _transfer(sender, recipient, amountAfterTax);

        return true;
    }

    /**
     * @notice distribute to reward pool (only once)
     */
    function distributeReward(
        address _genesisPool,
        address _tombPool,
        address _airdropWallet
    ) external onlyOperator {
        require(!rewardPoolDistributed, "only can distribute once");
        require(_genesisPool != address(0), "!_genesisPool");
        require(_tombPool != address(0), "!_tombPool");
        require(_airdropWallet != address(0), "!_airdropWallet");
        rewardPoolDistributed = true;
        _mint(_genesisPool, INITIAL_GENESIS_POOL_DISTRIBUTION);
        _mint(_tombPool, INITIAL_TOMB_POOL_DISTRIBUTION);
        _mint(_airdropWallet, INITIAL_AIRDROP_WALLET_DISTRIBUTION);
    }

    function governanceRecoverUnsupported(
        IERC20 _token,
        uint256 _amount,
        address _to
    ) external onlyOperator {
        _token.transfer(_to, _amount);
    }
}

File 2 of 12 : IOracle.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IOracle {
    function update() external;

    function consult(address _token, uint256 _amountIn) external view returns (uint144 amountOut);

    function twap(address _token, uint256 _amountIn) external view returns (uint144 _amountOut);
}

File 3 of 12 : SafeMath8.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath8 {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint8 a, uint8 b) internal pure returns (uint8) {
        uint8 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint8 a, uint8 b) internal pure returns (uint8) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint8 a, uint8 b, string memory errorMessage) internal pure returns (uint8) {
        require(b <= a, errorMessage);
        uint8 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint8 a, uint8 b) internal pure returns (uint8) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint8 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint8 a, uint8 b) internal pure returns (uint8) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint8 a, uint8 b, string memory errorMessage) internal pure returns (uint8) {
        require(b > 0, errorMessage);
        uint8 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint8 a, uint8 b) internal pure returns (uint8) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint8 a, uint8 b, string memory errorMessage) internal pure returns (uint8) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

File 4 of 12 : Operator.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import "@openzeppelin/contracts/GSN/Context.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract Operator is Context, Ownable {
    address private _operator;

    event OperatorTransferred(address indexed previousOperator, address indexed newOperator);

    constructor() internal {
        _operator = _msgSender();
        emit OperatorTransferred(address(0), _operator);
    }

    function operator() public view returns (address) {
        return _operator;
    }

    modifier onlyOperator() {
        require(_operator == msg.sender, "operator: caller is not the operator");
        _;
    }

    function isOperator() public view returns (bool) {
        return _msgSender() == _operator;
    }

    function transferOperator(address newOperator_) public onlyOwner {
        _transferOperator(newOperator_);
    }

    function _transferOperator(address newOperator_) internal {
        require(newOperator_ != address(0), "operator: zero address given for new operator");
        emit OperatorTransferred(address(0), newOperator_);
        _operator = newOperator_;
    }
}

File 5 of 12 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/Context.sol";

File 6 of 12 : Ownable.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

File 7 of 12 : Math.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}

File 8 of 12 : SafeMath.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

File 9 of 12 : ERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../../utils/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

File 10 of 12 : ERC20Burnable.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../../utils/Context.sol";
import "./ERC20.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    using SafeMath for uint256;

    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");

        _approve(account, _msgSender(), decreasedAllowance);
        _burn(account, amount);
    }
}

File 11 of 12 : IERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

File 12 of 12 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

Settings
{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

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function"},{"inputs":[{"internalType":"contract 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ess"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOperator_","type":"address"}],"name":"transferOperator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000fa5a3b6f8e26a7c2c67bd205ffcfa9f89b0e8d1

-----Decoded View---------------
Arg [0] : _taxRate (uint256): 0
Arg [1] : _taxCollectorAddress (address): 0x0fa5a3b6f8e26a7c2c67bd205ffcfa9f89b0e8d1

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [1] : 0000000000000000000000000fa5a3b6f8e26a7c2c67bd205ffcfa9f89b0e8d1


Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Validator ID :
0 FTM

Amount Staked
0

Amount Delegated
0

Staking Total
0

Staking Start Epoch
0

Staking Start Time
0

Proof of Importance
0

Origination Score
0

Validation Score
0

Active
0

Online
0

Downtime
0 s
Address Amount claimed Rewards Created On Epoch Created On
Block Uncle Number Difficulty Gas Used Reward
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