Contract 0xa8e8850B50a07e89bd9DC89F2C79384Ac60fB159

 
 
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Block
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Value [Txn Fee]
0xbdd7596e355237379dd3461618d0ff4e5ae14bb68e19d6cffdc672c24fa72251Safe Transfer Fr...288512742022-05-27 23:38:0630 days 3 hrs ago0x0dc59ef3a29d4c7ac87ba04071eee3fb5dedf356 IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.002977941679 33.319999993
0xe40634d435efa4772770d3746ef9b840c8a9d4bb3e720f307293f4be71e76de1Safe Transfer Fr...288512642022-05-27 23:37:4630 days 3 hrs ago0x0dc59ef3a29d4c7ac87ba04071eee3fb5dedf356 IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.002482088533 33.418000017
0xd31ab4cbe6c727e147c038deceb718d3ebbb3c5fe83d2ed0bf093d7112731d57Safe Transfer Fr...288512512022-05-27 23:37:1630 days 3 hrs ago0x0dc59ef3a29d4c7ac87ba04071eee3fb5dedf356 IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.003193054175 35.726880032
0x664a14a6bbc45a3a3341ce46bf79d7d218e14c3224cd7b12beb96a3c862e782eSet Approval For...199703552021-10-08 4:31:01261 days 22 hrs ago0x0ffe1c09006c525da200eb69e86d8c6b58bf0e91 IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0004623410
0xd2d89e5e883eef98bb25877a2532f3520e0eed5c20556e2b886029a3aad9413cComplete Viking197446932021-10-02 4:25:32267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0024694100
0xdd59ab885489e215953f0f0ecb5e5069d1b6d2d6b2a93873582a4d483b1c3e0bComplete Viking197446862021-10-02 4:25:18267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0024694100
0x58ca1a8c32470c8c43f2e3fd6ece2d54bbfdfa7e02cba54f9f98cbf976f613bdResolve Viking197446782021-10-02 4:25:02267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0430676100
0x9d011edaced58bc909d55b5cf01f656e989d6d960a189ad5540a60ff6a83f731Resolve Viking197446712021-10-02 4:24:48267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0430707100
0xa20baf5806c18a4ba5530114ee6759cbde150af33c3ac79b9bf78dff06241e00Generate Viking197446632021-10-02 4:24:32267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0325502100
0xedc448b132ecceb58109f61043ea0e485370f8286c9ff8e77188a7c46d4c186aGenerate Viking197446562021-10-02 4:24:18267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0325502100
0x453ed6fa18e27b355f029d404f13202ac9b4f225d2b2d12c3d4fa97a0c254314Complete Viking197446482021-10-02 4:24:02267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0024694100
0xb43146dde75c533ca5eef458d40ea31ac2f266d4657f6b194c1038bde5943ca8Complete Viking197446412021-10-02 4:23:48267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0024694100
0x31f5a89bc48d719b73a25bed33e4d705e03d91422674be7c1b0c5c51257107d4Resolve Viking197446352021-10-02 4:23:32267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0431271100
0xc5d03885cfe9f377f7471b33d53b8b4a103114481c59b728184ae9417eb8899bResolve Viking197446282021-10-02 4:23:18267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.043086100
0x30bf613d40b9c617cfa4f4090f971bb95ba6fa7a2c952af55a86ce30e1497ebfGenerate Viking197446202021-10-02 4:23:02267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0325502100
0x5bc6fb386911c806b3d36783afc64e320235aad4983232d181ff957b25569501Generate Viking197446132021-10-02 4:22:48267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0325502100
0x40562436948e0b000b8d243a68e8f114b52edf673ac72263a97544d9801023a3Complete Viking197446052021-10-02 4:22:32267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0024694100
0x97f7d880a7d0cfc7fcec5aa2aed55259d99b53380725dafefd2d2e7697bb4f2eComplete Viking197445982021-10-02 4:22:18267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0024694100
0x17d5706553b77eb96c6df087bd4e3438c947a07b129e7fcbd9924d504d372f4cResolve Viking197445912021-10-02 4:22:04267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0430756100
0x372d84abcaaf0395da3f53b8a24ab50987c7e81a7b3e90087afee4692260419bResolve Viking197445832021-10-02 4:21:48267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.043077100
0x9f5389d31348c4b02298c44e914215b6f7a213267e3b025ce7838d339499999cGenerate Viking197445762021-10-02 4:21:34267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0325502100
0x76d1a00d996511c5878b4a838a9342e3dbbec3a761ae1d309bc9caef22c4a2ffGenerate Viking197445702021-10-02 4:21:18267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0325502100
0xde6cb9aace4ee80d710ace7c08674ad25a77d64388e7a0b18313b2fbfdbfd6e2Complete Viking197445632021-10-02 4:21:04267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0024694100
0xa2337df6860672632041d2ed955c9ac0f436305ec00a74fbe5f32387ed565becComplete Viking197445552021-10-02 4:20:48267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0024694100
0x809485a4f7ffffd35a7c9404c8abf6a9a3f17fd43e12eff18cdf44001c225fc6Resolve Viking197445482021-10-02 4:20:34267 days 22 hrs ago0xcc001d8e687d0157edbdf46a65eba563f9d4b7cf IN  0xa8e8850b50a07e89bd9dc89f2c79384ac60fb1590 MATIC0.0430688100
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Contract Source Code Verified (Exact Match)

Contract Name:
Nornir

Compiler Version
v0.8.4+commit.c7e474f2

Optimization Enabled:
Yes with 175 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 21 : Nornir.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import '@openzeppelin/contracts/token/ERC721/ERC721.sol';
import '@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol';
import '@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol';
import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/utils/Strings.sol';
import '@chainlink/contracts/src/v0.8/VRFConsumerBase.sol';
import '../interfaces/IWeth.sol';
import '../interfaces/INornirResolver.sol';
import '../libraries/NornirStructs.sol';

/**
 * Main Nornir Contract serving the CryptoVikings collection
 *
 * Implements minting functionality, involving a multi-part procedure of Viking representation breakdown + storage based on a VRF-provided number
 */
contract Nornir is
	ERC721,
	ERC721Enumerable,
	ERC721URIStorage,
	Ownable,
	VRFConsumerBase
{
	using Strings for uint256;

	/** Events - all of these are for facilitating the generation/resolution procedure which occurs on mint, as well as front end user feedback for the same */
	event VikingsMinted(uint256[]);
	event VikingReady(uint256 vikingId);
	event VikingGenerated(uint256 vikingId);
	event VikingResolved(uint256 vikingId, NornirStructs.VikingStats stats, NornirStructs.VikingComponents components, NornirStructs.VikingConditions conditions);
	event VikingComplete(uint256 vikingId);
	event NameChange(uint256 id, string name);

	uint16 public constant MAX_VIKINGS = 9873;
	uint16 public constant MAX_BULK = 50;
	uint16 public constant MAX_OWNER_MINTS = 50;
	uint16 internal constant MAX_PRESALE_VIKINGS = 505;
	uint16 internal constant MAX_PRESALE_MINTS = 5;

	address public constant TREASURY = 0x10073Fb6D644113469bD8e30404BCaD6715388ff;
	address internal constant WETH_ADDRESS = 0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619;

	/* Contracts to be instantiated for internal use */
	IWeth public wETHContract;
	INornirResolver public nornirResolverContract;

	uint256 public launchBlock = 19435000;

	string public baseURI = 'https://api.cryptovikings.io/viking/';

	bool public mintingPaused = false;
	bool public presaleActive = false;
	uint256 public generatedVikingCount = 0;
	uint256 public resolvedVikingCount = 0;
	uint256 public ownerMintedCount = 0;

	/* VRF info */
	uint256 internal fee;
	bytes32 internal keyHash;
	address internal vrfCoordinator;

	/* Mapping of tokenId => VikingStats for on-chain storage of the VRF-derived numerical Viking representation */
	mapping(uint256 => NornirStructs.VikingStats) public vikingStats;
	/* Mapping of tokenId => VikingComponents for on-chain storage of the VikingStats-derived Viking Component Names */
	mapping(uint256 => NornirStructs.VikingComponents) public vikingComponents;
	/* Mapping of tokenId => VikingConditions for on-chain storage of the VikingStats-derived Viking Item Condition Names */
	mapping(uint256 => NornirStructs.VikingConditions) public vikingConditions;
	/* Mapping of tokenId => VRF-provided randomNumber for facilitating a breakup of the generation procedure */
	mapping(uint256 => uint256) public vikingIdToRandomNumber;
	/** Mapping of address => boolean for whitelisting wallets for presale */
	mapping(address => bool) public presaleWhitelist;
	/** Mapping of address => count for capping whitelisted wallet purchases in presale */
	mapping(address => uint256) public presaleMintCounts;
	/* Mapping of VRF requestId => tokenId for facilitating a breakup of the generation procedure */
	mapping(bytes32 => uint256) internal requestIdToVikingId;
	/* Mapping of name => boolean for facilitating unique-name validation */
	mapping(bytes32 => bool) internal vikingNames;

	/**
	 * Constructor - set up our external contracts and configure ourselves for VRF usage
	 */
	constructor(address _VRFCoordinator, address _LinkToken, bytes32 _keyHash) VRFConsumerBase(_VRFCoordinator, _LinkToken) ERC721('Viking', 'VKNG') {
		wETHContract = IWeth(WETH_ADDRESS);

		vrfCoordinator = _VRFCoordinator;
		keyHash = _keyHash;

		fee = 0.1 * 10**15;
	}

	/**
	 * Regular mint method for external users
	 *
	 * @param count the number of Vikings to mint
	 */
	function mintViking(uint256 count) public {
		doMint(count, false);
	}

	/**
	 * Protected mint method for Contract owner
	 *
	 * @param count the number of Vikings to mint
	 */
	function ownerMintViking(uint256 count) public onlyOwner {
		doMint(count, true);
	}

	/**
	 * Retrieve all Viking information for a given Token ID at once
	 */
	function getVikingData(uint256 vikingId) public view returns (NornirStructs.VikingStats memory, NornirStructs.VikingComponents memory, NornirStructs.VikingConditions memory) {
		return (vikingStats[vikingId], vikingComponents[vikingId], vikingConditions[vikingId]);
	}

	/**
	 * Calculate the price of minting a given number of Vikings
	 *
	 * Implements the per-NFT bulk-buy discount
	 *
	 * @param qty the number of Vikings to get the price for
	 */
	function calculatePrice(uint256 qty) public view returns (uint256) {
		require(qty > 0 && qty <= MAX_BULK, 'Can only price 1-50 Vikings');

		if (presaleActive) {
			return 50000000000000000 * qty; // 0.05 WETH each
		}

		if (qty >= 25) {
			return 65000000000000000 * qty; // 0.065 WETH each
		}

		if (qty >= 10) {
			return 75000000000000000 * qty; // 0.075 WETH each
		}

		return 85000000000000000 * qty; // 0.085 WETH each
	}

	/**
	 * Validate a given Viking Name
	 *
	 * Names must be:
	 *   - max of 25 characters
	 *   - alhpanumeric
	 *   - no leading or trailing spaces
	 *   - no internal contiguous spaces
	 */
	function validateName(string memory str) public pure returns (bool) {
		bytes memory b = bytes(str);
		if (b.length < 1) return false;
		if (b.length > 25) return false; // Cannot be longer than 25 characters
		if (b[0] == 0x20) return false; // Cannot have leading space
		if (b[b.length - 1] == 0x20) return false; // Cannot have trailing space

		bytes1 lastChar = b[0];

		for (uint256 i; i < b.length; i++) {
			bytes1 char = b[i];

			if (char == 0x20 && lastChar == 0x20) return false; // Cannot contain continous spaces

			if (
				!(char >= 0x30 && char <= 0x39) && //9-0
				!(char >= 0x41 && char <= 0x5A) && //A-Z
				!(char >= 0x61 && char <= 0x7A) && //a-z
				!(char == 0x20) //space
			) return false;

			lastChar = char;
		}

		return true;
	}

	/**
	 * Viking name change method - only the current owner can change the name and the name must be valid
	 */
	function changeName(uint256 vikingId, string memory newName) public {
		require(msg.sender == ownerOf(vikingId), 'Sender does not own Viking');
		require(validateName(newName) == true, 'Name is invalid');
		require(!vikingNames[keccak256(abi.encodePacked(newName))], 'Name is not unique');

		delete vikingNames[keccak256(abi.encodePacked(vikingStats[vikingId].name))];

		vikingStats[vikingId].name = newName;
		vikingNames[keccak256(abi.encodePacked(newName))] = true;

		emit NameChange(vikingId, newName);
	}

	/**
	 * Check if minting is live
	 */
	function isLaunched() public view returns (bool) {
		return block.number >= launchBlock;
	}

	/**
	 * Protected method for toggling mintingPaused
	 */
	function togglePaused() public onlyOwner {
		mintingPaused = !mintingPaused;
	}

	/**
	 * Protected method for toggling the presale
	 */
	function togglePresale() public onlyOwner {
		presaleActive = !presaleActive;
	}

	/**
	 * Protected method for changing the baseURI, facilitating future migrations of the CryptoVikings metadata
	 */
	function changeBaseURI(string memory newURI) public onlyOwner {
		baseURI = newURI;
	}

	/**
	 * Protected method for whitelisting a wallet address
	 */
	function whitelist(address wallet, bool status) public onlyOwner {
		presaleWhitelist[wallet] = status;
	}

	/**
	 * Protected method for changing the launch block, facilitating tweaks towards an intended launch time
	 *
	 * Block may not be changed if launch has already passed
	 */
	function changeLaunchBlock(uint256 newBlock) public onlyOwner {
		require(!isLaunched(), 'CryptoVikings already launched');

		launchBlock = newBlock;
	}

	/**
	 * Protected method for changing the NornirResolver Contract, facilitating improvements/changes/fixes to resolution
     *
	 * Resolver is not set in constructor and is required for validateMint(), so this must be called at least once
	 */
	function changeNornirResolver(address _nornirResolver) public onlyOwner {
	    nornirResolverContract = INornirResolver(_nornirResolver);
	}

	/**
	 * Protected withdraw method
	 */
	function withdraw() public payable onlyOwner {
		uint256 balance = address(this).balance;
		payable(TREASURY).transfer(balance);
	}

	/**
	 * Protected ERC-20 withdraw method
	 */
	function withdrawErc20(IERC20 token) public onlyOwner {
		token.transfer(TREASURY, token.balanceOf(address(this)));
	}

	/**
	 * Abstracted mint require block
	 *
	 * @param count the number of Vikings to mint
	 * @param isOwner whether or not we're validating an owner mint
	 */
	function validateMint(uint256 count, bool isOwner) internal view {
		require(presaleActive || block.number >= launchBlock, 'Vikings not yet released');
		require(!mintingPaused, 'Minting is paused');
		require(address(nornirResolverContract) != address(0), 'NornirResolver not set');

		uint256 supply = totalSupply();
		uint16 limit = presaleActive ? MAX_PRESALE_VIKINGS : MAX_VIKINGS;
		uint16 max = presaleActive ? MAX_PRESALE_MINTS : MAX_BULK;

		require(supply < limit, 'Sold out');
		require(count > 0, 'Mint at least 1 Viking');
		require(count <= max, 'Too many Vikings');
		require(supply + count <= limit, 'Mint exceeds limit');

		if (presaleActive) {
			require(presaleWhitelist[msg.sender], 'Wallet not whitelisted');
			require(presaleMintCounts[msg.sender] < max, 'Presale limit reached');
			require(presaleMintCounts[msg.sender] + count <= max, 'Mint exceeds presale limit');
		}

		if (isOwner) {
			// additional checks for owner mints
			require(ownerMintedCount < MAX_OWNER_MINTS, 'Max owner mints reached');
			require(ownerMintedCount + count <= MAX_OWNER_MINTS, 'Mint exceeds MAX_OWNER_MINTS');
		}
	}

	/**
	 * Abstracted mint procedure
	 *
	 * Actions payment, mints the NFT(s), and requests randomness from VRF for each minted token
	 *
	 * @param count the number of Vikings to mint
	 * @param isOwner whether or not we're actioning an owner mint
	 */
	function doMint(uint256 count, bool isOwner) internal {
		validateMint(count, isOwner);

		uint256 price = calculatePrice(count);

		// if not owner, action payment
		if (!isOwner) {
			require(wETHContract.allowance(msg.sender, address(this)) >= price, 'Not enough WETH approved');
			require(wETHContract.transferFrom(msg.sender, address(this), price) == true, 'Not enough WETH for TX');
		}

		// iterate over count, minting tokens and requesting randomness in sequence
		uint256[] memory mintedIds = new uint256[](count);

		for (uint256 i = 0; i < count; i++) {
			uint256 id = totalSupply();

			_safeMint(msg.sender, id);

			_setTokenURI(id, id.toString());

			requestIdToVikingId[requestRandomness(keyHash, fee)] = id;

			mintedIds[i] = id;

			if (isOwner) {
				ownerMintedCount++;
			}

			if (presaleActive) {
				presaleMintCounts[msg.sender]++;
			}
		}

		if (!isOwner) {
			wETHContract.transfer(address(TREASURY), price);
		}

		emit VikingsMinted(mintedIds);
	}

	/**
	 * VRF fulfillRandomness() override
	 *
	 * Associates the received random number with a token ID using the requestId as a connector before prompting the API to begin generation via VikingReady
	 *
	 * @param requestId the VRF request ID
	 * @param randomNumber the supplied random number
	 */
	function fulfillRandomness(bytes32 requestId, uint256 randomNumber) internal override {
		uint256 vikingId = requestIdToVikingId[requestId];

		vikingIdToRandomNumber[vikingId] = randomNumber;

		emit VikingReady(vikingId);
	}

	/**
	 * Protected Viking generation - step 1 of the generation/resolution procedure
     *
	 * For the given token ID, retrieve the random number and break it down into a VikingStats
	 *
	 * @param vikingId the token ID to generate a VikingStats for
	 */
	function generateViking(uint256 vikingId) public onlyOwner {
		require(vikingIdToRandomNumber[vikingId] != 0, 'Viking not minted');
		require(vikingStats[vikingId].appearance == 0, 'Viking already generated');

		uint256 randomNumber = vikingIdToRandomNumber[vikingId];

		vikingStats[vikingId] = NornirStructs.VikingStats(
			string(abi.encodePacked('Viking #', vikingId.toString())),
			(randomNumber % 100),
			(randomNumber % 10000) / 100,
			(randomNumber % 10**6) / 10**4,
			(randomNumber % 10**8) / 10**6,
			(randomNumber % 10**10) / 10**8,
			(randomNumber % 10**12) / 10**10,
			(randomNumber % 10**14) / 10**12,
			(randomNumber % 10**16) / 10**14,
			(randomNumber % 10**18) / 10**16,
			(randomNumber % 10**20) / 10**18,
			(randomNumber % 10**28) / 10**20
		);

		// in normal operation, this should match totalSupply()
		generatedVikingCount++;

		vikingNames[
			keccak256(abi.encodePacked('Viking #', vikingId.toString()))
		] = true;

		emit VikingGenerated(vikingId);
	}

	/**
	 * Protected Viking component/condition resolution procedure, calling out to the NornirResolver Contract - step 2 of the generation/resolution procedure
	 *
	 * For the given token ID, resolve all component names and item conditions using the existing associated VikingStats
	 *
	 * @param vikingId the token ID to resolve VikingComponents and VikingConditions for
	 */
	function resolveViking(uint256 vikingId) public onlyOwner {
		require(vikingStats[vikingId].appearance != 0, 'Viking not generated');
		require(bytes(vikingComponents[vikingId].weapon).length == 0, 'components already resolved');
		require(bytes(vikingConditions[vikingId].weapon).length == 0, 'Conditions already resolved');

		vikingConditions[vikingId] = nornirResolverContract.resolveConditions(vikingStats[vikingId]);
		vikingComponents[vikingId] = nornirResolverContract.resolveComponents(vikingStats[vikingId], vikingConditions[vikingId]);

		// in normal operation, this should match generatedVikingCount
		resolvedVikingCount++;

		emit VikingResolved(vikingId, vikingStats[vikingId], vikingComponents[vikingId], vikingConditions[vikingId]);
	}

	/**
	 * Protected Viking completion procedure = step 3 of the generation/resolution procedure
	 *
	 * Just emits an event that the front end can pick up to complete the walkthrough UX and enable the reveal
	 *
	 * @param vikingId the token ID to emit a completion event for
	 */
	function completeViking(uint256 vikingId) public onlyOwner {
		emit VikingComplete(vikingId);
	}

	/** ERC-721 overrides */
	function _baseURI() internal view override returns (string memory) {
		return baseURI;
	}

	function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal override(ERC721, ERC721Enumerable) {
		super._beforeTokenTransfer(from, to, tokenId);
	}

	function _burn(uint256 tokenId) internal override(ERC721, ERC721URIStorage) {
		super._burn(tokenId);
	}

	function tokenURI(uint256 tokenId) public view override(ERC721, ERC721URIStorage) returns (string memory) {
		return super.tokenURI(tokenId);
	}

	function supportsInterface(bytes4 interfaceId) public view override(ERC721, ERC721Enumerable) returns (bool) {
		return super.supportsInterface(interfaceId);
	}
}

File 2 of 21 : ERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` 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 tokenId
    ) internal virtual {}
}

File 3 of 21 : ERC721Enumerable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}

File 4 of 21 : ERC721URIStorage.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC721.sol";

/**
 * @dev ERC721 token with storage based token URI management.
 */
abstract contract ERC721URIStorage is ERC721 {
    using Strings for uint256;

    // Optional mapping for token URIs
    mapping(uint256 => string) private _tokenURIs;

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721URIStorage: URI query for nonexistent token");

        string memory _tokenURI = _tokenURIs[tokenId];
        string memory base = _baseURI();

        // If there is no base URI, return the token URI.
        if (bytes(base).length == 0) {
            return _tokenURI;
        }
        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
        if (bytes(_tokenURI).length > 0) {
            return string(abi.encodePacked(base, _tokenURI));
        }

        return super.tokenURI(tokenId);
    }

    /**
     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
        require(_exists(tokenId), "ERC721URIStorage: URI set of nonexistent token");
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual override {
        super._burn(tokenId);

        if (bytes(_tokenURIs[tokenId]).length != 0) {
            delete _tokenURIs[tokenId];
        }
    }
}

File 5 of 21 : IERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^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 6 of 21 : Ownable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^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() {
        _setOwner(_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 {
        _setOwner(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");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 7 of 21 : Strings.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

File 8 of 21 : VRFConsumerBase.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./interfaces/LinkTokenInterface.sol";

import "./VRFRequestIDBase.sol";

/** ****************************************************************************
 * @notice Interface for contracts using VRF randomness
 * *****************************************************************************
 * @dev PURPOSE
 *
 * @dev Reggie the Random Oracle (not his real job) wants to provide randomness
 * @dev to Vera the verifier in such a way that Vera can be sure he's not
 * @dev making his output up to suit himself. Reggie provides Vera a public key
 * @dev to which he knows the secret key. Each time Vera provides a seed to
 * @dev Reggie, he gives back a value which is computed completely
 * @dev deterministically from the seed and the secret key.
 *
 * @dev Reggie provides a proof by which Vera can verify that the output was
 * @dev correctly computed once Reggie tells it to her, but without that proof,
 * @dev the output is indistinguishable to her from a uniform random sample
 * @dev from the output space.
 *
 * @dev The purpose of this contract is to make it easy for unrelated contracts
 * @dev to talk to Vera the verifier about the work Reggie is doing, to provide
 * @dev simple access to a verifiable source of randomness.
 * *****************************************************************************
 * @dev USAGE
 *
 * @dev Calling contracts must inherit from VRFConsumerBase, and can
 * @dev initialize VRFConsumerBase's attributes in their constructor as
 * @dev shown:
 *
 * @dev   contract VRFConsumer {
 * @dev     constuctor(<other arguments>, address _vrfCoordinator, address _link)
 * @dev       VRFConsumerBase(_vrfCoordinator, _link) public {
 * @dev         <initialization with other arguments goes here>
 * @dev       }
 * @dev   }
 *
 * @dev The oracle will have given you an ID for the VRF keypair they have
 * @dev committed to (let's call it keyHash), and have told you the minimum LINK
 * @dev price for VRF service. Make sure your contract has sufficient LINK, and
 * @dev call requestRandomness(keyHash, fee, seed), where seed is the input you
 * @dev want to generate randomness from.
 *
 * @dev Once the VRFCoordinator has received and validated the oracle's response
 * @dev to your request, it will call your contract's fulfillRandomness method.
 *
 * @dev The randomness argument to fulfillRandomness is the actual random value
 * @dev generated from your seed.
 *
 * @dev The requestId argument is generated from the keyHash and the seed by
 * @dev makeRequestId(keyHash, seed). If your contract could have concurrent
 * @dev requests open, you can use the requestId to track which seed is
 * @dev associated with which randomness. See VRFRequestIDBase.sol for more
 * @dev details. (See "SECURITY CONSIDERATIONS" for principles to keep in mind,
 * @dev if your contract could have multiple requests in flight simultaneously.)
 *
 * @dev Colliding `requestId`s are cryptographically impossible as long as seeds
 * @dev differ. (Which is critical to making unpredictable randomness! See the
 * @dev next section.)
 *
 * *****************************************************************************
 * @dev SECURITY CONSIDERATIONS
 *
 * @dev A method with the ability to call your fulfillRandomness method directly
 * @dev could spoof a VRF response with any random value, so it's critical that
 * @dev it cannot be directly called by anything other than this base contract
 * @dev (specifically, by the VRFConsumerBase.rawFulfillRandomness method).
 *
 * @dev For your users to trust that your contract's random behavior is free
 * @dev from malicious interference, it's best if you can write it so that all
 * @dev behaviors implied by a VRF response are executed *during* your
 * @dev fulfillRandomness method. If your contract must store the response (or
 * @dev anything derived from it) and use it later, you must ensure that any
 * @dev user-significant behavior which depends on that stored value cannot be
 * @dev manipulated by a subsequent VRF request.
 *
 * @dev Similarly, both miners and the VRF oracle itself have some influence
 * @dev over the order in which VRF responses appear on the blockchain, so if
 * @dev your contract could have multiple VRF requests in flight simultaneously,
 * @dev you must ensure that the order in which the VRF responses arrive cannot
 * @dev be used to manipulate your contract's user-significant behavior.
 *
 * @dev Since the ultimate input to the VRF is mixed with the block hash of the
 * @dev block in which the request is made, user-provided seeds have no impact
 * @dev on its economic security properties. They are only included for API
 * @dev compatability with previous versions of this contract.
 *
 * @dev Since the block hash of the block which contains the requestRandomness
 * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful
 * @dev miner could, in principle, fork the blockchain to evict the block
 * @dev containing the request, forcing the request to be included in a
 * @dev different block with a different hash, and therefore a different input
 * @dev to the VRF. However, such an attack would incur a substantial economic
 * @dev cost. This cost scales with the number of blocks the VRF oracle waits
 * @dev until it calls responds to a request.
 */
abstract contract VRFConsumerBase is VRFRequestIDBase {

  /**
   * @notice fulfillRandomness handles the VRF response. Your contract must
   * @notice implement it. See "SECURITY CONSIDERATIONS" above for important
   * @notice principles to keep in mind when implementing your fulfillRandomness
   * @notice method.
   *
   * @dev VRFConsumerBase expects its subcontracts to have a method with this
   * @dev signature, and will call it once it has verified the proof
   * @dev associated with the randomness. (It is triggered via a call to
   * @dev rawFulfillRandomness, below.)
   *
   * @param requestId The Id initially returned by requestRandomness
   * @param randomness the VRF output
   */
  function fulfillRandomness(
    bytes32 requestId,
    uint256 randomness
  )
    internal
    virtual;

  /**
   * @dev In order to keep backwards compatibility we have kept the user
   * seed field around. We remove the use of it because given that the blockhash
   * enters later, it overrides whatever randomness the used seed provides.
   * Given that it adds no security, and can easily lead to misunderstandings,
   * we have removed it from usage and can now provide a simpler API.
   */
  uint256 constant private USER_SEED_PLACEHOLDER = 0;

  /**
   * @notice requestRandomness initiates a request for VRF output given _seed
   *
   * @dev The fulfillRandomness method receives the output, once it's provided
   * @dev by the Oracle, and verified by the vrfCoordinator.
   *
   * @dev The _keyHash must already be registered with the VRFCoordinator, and
   * @dev the _fee must exceed the fee specified during registration of the
   * @dev _keyHash.
   *
   * @dev The _seed parameter is vestigial, and is kept only for API
   * @dev compatibility with older versions. It can't *hurt* to mix in some of
   * @dev your own randomness, here, but it's not necessary because the VRF
   * @dev oracle will mix the hash of the block containing your request into the
   * @dev VRF seed it ultimately uses.
   *
   * @param _keyHash ID of public key against which randomness is generated
   * @param _fee The amount of LINK to send with the request
   *
   * @return requestId unique ID for this request
   *
   * @dev The returned requestId can be used to distinguish responses to
   * @dev concurrent requests. It is passed as the first argument to
   * @dev fulfillRandomness.
   */
  function requestRandomness(
    bytes32 _keyHash,
    uint256 _fee
  )
    internal
    returns (
      bytes32 requestId
    )
  {
    LINK.transferAndCall(vrfCoordinator, _fee, abi.encode(_keyHash, USER_SEED_PLACEHOLDER));
    // This is the seed passed to VRFCoordinator. The oracle will mix this with
    // the hash of the block containing this request to obtain the seed/input
    // which is finally passed to the VRF cryptographic machinery.
    uint256 vRFSeed  = makeVRFInputSeed(_keyHash, USER_SEED_PLACEHOLDER, address(this), nonces[_keyHash]);
    // nonces[_keyHash] must stay in sync with
    // VRFCoordinator.nonces[_keyHash][this], which was incremented by the above
    // successful LINK.transferAndCall (in VRFCoordinator.randomnessRequest).
    // This provides protection against the user repeating their input seed,
    // which would result in a predictable/duplicate output, if multiple such
    // requests appeared in the same block.
    nonces[_keyHash] = nonces[_keyHash] + 1;
    return makeRequestId(_keyHash, vRFSeed);
  }

  LinkTokenInterface immutable internal LINK;
  address immutable private vrfCoordinator;

  // Nonces for each VRF key from which randomness has been requested.
  //
  // Must stay in sync with VRFCoordinator[_keyHash][this]
  mapping(bytes32 /* keyHash */ => uint256 /* nonce */) private nonces;

  /**
   * @param _vrfCoordinator address of VRFCoordinator contract
   * @param _link address of LINK token contract
   *
   * @dev https://docs.chain.link/docs/link-token-contracts
   */
  constructor(
    address _vrfCoordinator,
    address _link
  ) {
    vrfCoordinator = _vrfCoordinator;
    LINK = LinkTokenInterface(_link);
  }

  // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF
  // proof. rawFulfillRandomness then calls fulfillRandomness, after validating
  // the origin of the call
  function rawFulfillRandomness(
    bytes32 requestId,
    uint256 randomness
  )
    external
  {
    require(msg.sender == vrfCoordinator, "Only VRFCoordinator can fulfill");
    fulfillRandomness(requestId, randomness);
  }
}

File 9 of 21 : IWeth.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * WETH Interface, describing the public API of the WETH Contract
 */
interface IWeth {
	function balanceOf(address _owner) external view returns (uint256);

	function transfer(address _to, uint256 _value) external returns (bool);

	function transferFrom(address _from, address _to, uint256 _value) external returns (bool);

	function approve(address _spender, uint256 _value) external returns (bool);

	function allowance(address _owner, address _spender) external view returns (uint256);
}

File 10 of 21 : INornirResolver.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import '../libraries/NornirStructs.sol';

/**
 * Nornir Resolver Interface, describing the public API of the NornirResolver Contract
 */
interface INornirResolver {
    function resolveConditions(NornirStructs.VikingStats memory vikingStats) external pure returns (NornirStructs.VikingConditions memory);
    function resolveComponents(NornirStructs.VikingStats memory vikingStats, NornirStructs.VikingConditions memory vikingConditions) external pure returns (NornirStructs.VikingComponents memory);
}

File 11 of 21 : NornirStructs.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * Structs required by both Nornir and NornirResolver implemented in a library for sharing
 */
library NornirStructs {

	/** VikingStats - a store for the VRF-derived numerical representation of a Viking */
    struct VikingStats {
		string name;
		uint256 boots;
		uint256 bottoms;
		uint256 helmet;
		uint256 shield;
		uint256 weapon;
		uint256 attack;
		uint256 defence;
		uint256 intelligence;
		uint256 speed;
		uint256 stamina;
		uint256 appearance;
	}

	/** VikingComponents - a store for the VikingStats-derived resolved Component asset names for a Viking */
	struct VikingComponents {
		string beard;
		string body;
		string face;
		string top;
		string boots;
		string bottoms;
		string helmet;
		string shield;
		string weapon;
	}

	/** VikingConditions - a store for the VikingStats-derived resolved Component Condition names for a Viking's Clothes + Items */
	struct VikingConditions {
		string boots;
		string bottoms;
		string helmet;
		string shield;
		string weapon;
	}
}

File 12 of 21 : IERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

File 13 of 21 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

File 14 of 21 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

File 15 of 21 : Address.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 16 of 21 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity ^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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 17 of 21 : ERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

File 18 of 21 : IERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

File 19 of 21 : IERC721Enumerable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

File 20 of 21 : LinkTokenInterface.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface LinkTokenInterface {

  function allowance(
    address owner,
    address spender
  )
    external
    view
    returns (
      uint256 remaining
    );

  function approve(
    address spender,
    uint256 value
  )
    external
    returns (
      bool success
    );

  function balanceOf(
    address owner
  )
    external
    view
    returns (
      uint256 balance
    );

  function decimals()
    external
    view
    returns (
      uint8 decimalPlaces
    );

  function decreaseApproval(
    address spender,
    uint256 addedValue
  )
    external
    returns (
      bool success
    );

  function increaseApproval(
    address spender,
    uint256 subtractedValue
  ) external;

  function name()
    external
    view
    returns (
      string memory tokenName
    );

  function symbol()
    external
    view
    returns (
      string memory tokenSymbol
    );

  function totalSupply()
    external
    view
    returns (
      uint256 totalTokensIssued
    );

  function transfer(
    address to,
    uint256 value
  )
    external
    returns (
      bool success
    );

  function transferAndCall(
    address to,
    uint256 value,
    bytes calldata data
  )
    external
    returns (
      bool success
    );

  function transferFrom(
    address from,
    address to,
    uint256 value
  )
    external
    returns (
      bool success
    );

}

File 21 of 21 : VRFRequestIDBase.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract VRFRequestIDBase {

  /**
   * @notice returns the seed which is actually input to the VRF coordinator
   *
   * @dev To prevent repetition of VRF output due to repetition of the
   * @dev user-supplied seed, that seed is combined in a hash with the
   * @dev user-specific nonce, and the address of the consuming contract. The
   * @dev risk of repetition is mostly mitigated by inclusion of a blockhash in
   * @dev the final seed, but the nonce does protect against repetition in
   * @dev requests which are included in a single block.
   *
   * @param _userSeed VRF seed input provided by user
   * @param _requester Address of the requesting contract
   * @param _nonce User-specific nonce at the time of the request
   */
  function makeVRFInputSeed(
    bytes32 _keyHash,
    uint256 _userSeed,
    address _requester,
    uint256 _nonce
  )
    internal
    pure
    returns (
      uint256
    )
  {
    return uint256(keccak256(abi.encode(_keyHash, _userSeed, _requester, _nonce)));
  }

  /**
   * @notice Returns the id for this request
   * @param _keyHash The serviceAgreement ID to be used for this request
   * @param _vRFInputSeed The seed to be passed directly to the VRF
   * @return The id for this request
   *
   * @dev Note that _vRFInputSeed is not the seed passed by the consuming
   * @dev contract, but the one generated by makeVRFInputSeed
   */
  function makeRequestId(
    bytes32 _keyHash,
    uint256 _vRFInputSeed
  )
    internal
    pure
    returns (
      bytes32
    )
  {
    return keccak256(abi.encodePacked(_keyHash, _vRFInputSeed));
  }
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 175
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

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NornirStructs.VikingStats","name":"stats","type":"tuple"},{"components":[{"internalType":"string","name":"beard","type":"string"},{"internalType":"string","name":"body","type":"string"},{"internalType":"string","name":"face","type":"string"},{"internalType":"string","name":"top","type":"string"},{"internalType":"string","name":"boots","type":"string"},{"internalType":"string","name":"bottoms","type":"string"},{"internalType":"string","name":"helmet","type":"string"},{"internalType":"string","name":"shield","type":"string"},{"internalType":"string","name":"weapon","type":"string"}],"indexed":false,"internalType":"struct NornirStructs.VikingComponents","name":"components","type":"tuple"},{"components":[{"internalType":"string","name":"boots","type":"string"},{"internalType":"string","name":"bottoms","type":"string"},{"internalType":"string","name":"helmet","type":"string"},{"internalType":"string","name":"shield","type":"string"},{"internalType":"string","name":"weapon","type":"string"}],"indexed":false,"internalType":"struct NornirStructs.VikingConditions","name":"conditions","type":"tuple"}],"name":"VikingResolved","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256[]","name":"","type":"uint256[]"}],"name":"VikingsMinted","type":"event"},{"inputs":[],"name":"MAX_BULK","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_OWNER_MINTS","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_VIKINGS","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TREASURY","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"baseURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"qty","type":"uint256"}],"name":"calculatePrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"newURI","type":"string"}],"name":"changeBaseURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"newBlock","type":"uint256"}],"name":"changeLaunchBlock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"vikingId","type":"uint256"},{"internalType":"string","name":"newName","type":"string"}],"name":"changeName","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_nornirResolver","type":"address"}],"name":"changeNornirResolver","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"vikingId","type":"uint256"}],"name":"completeViking","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"vikingId","type":"uint256"}],"name":"generateViking","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"generatedVikingCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"vikingId","type":"uint256"}],"name":"getVikingData","outputs":[{"components":[{"internalType":"string","name":"name","type":"string"},{"internalType":"uint256","name":"boots","type":"uint256"},{"internalType":"uint256","name":"bottoms","type":"uint256"},{"internalType":"uint256","name":"helmet","type":"uint256"},{"internalType":"uint256","name":"shield","type":"uint256"},{"internalType":"uint256","name":"weapon","type":"uint256"},{"internalType":"uint256","name":"attack","type":"uint256"},{"internalType":"uint256","name":"defence","type":"uint256"},{"internalType":"uint256","name":"intelligence","type":"uint256"},{"internalType":"uint256","name":"speed","type":"uint256"},{"internalType":"uint256","name":"stamina","type":"uint256"},{"internalType":"uint256","name":"appearance","type":"uint256"}],"internalType":"struct NornirStructs.VikingStats","name":"","type":"tuple"},{"components":[{"internalType":"string","name":"beard","type":"string"},{"internalType":"string","name":"body","type":"string"},{"internalType":"string","name":"face","type":"string"},{"internalType":"string","name":"top","type":"string"},{"internalType":"string","name":"boots","type":"string"},{"internalType":"string","name":"bottoms","type":"string"},{"internalType":"string","name":"helmet","type":"string"},{"internalType":"string","name":"shield","type":"string"},{"internalType":"string","name":"weapon","type":"string"}],"internalType":"struct NornirStructs.VikingComponents","name":"","type":"tuple"},{"components":[{"internalType":"string","name":"boots","type":"string"},{"internalType":"string","name":"bottoms","type":"string"},{"internalType":"string","name":"helmet","type":"string"},{"internalType":"string","name":"shield","type":"string"},{"internalType":"string","name":"weapon","type":"string"}],"internalType":"struct NornirStructs.VikingConditions","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isLaunched","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"launchBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"count","type":"uint256"}],"name":"mintViking","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"mintingPaused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"nornirResolverContract","outputs":[{"internalType":"contract INornirResolver","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"count","type":"uint256"}],"name":"ownerMintViking","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"ownerMintedCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"presaleActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"presaleMintCounts","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"presaleWhitelist","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"requestId","type":"bytes32"},{"internalType":"uint256","name":"randomness","type":"uint256"}],"name":"rawFulfillRandomness","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"vikingId","type":"uint256"}],"name":"resolveViking","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"resolvedVikingCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"togglePaused","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"togglePresale","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"str","type":"string"}],"name":"validateName","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"vikingComponents","outputs":[{"internalType":"string","name":"beard","type":"string"},{"internalType":"string","name":"body","type":"string"},{"internalType":"string","name":"face","type":"string"},{"internalType":"string","name":"top","type":"string"},{"internalType":"string","name":"boots","type":"string"},{"internalType":"string","name":"bottoms","type":"string"},{"internalType":"string","name":"helmet","type":"string"},{"internalType":"string","name":"shield","type":"string"},{"internalType":"string","name":"weapon","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"vikingConditions","outputs":[{"internalType":"string","name":"boots","type":"string"},{"internalType":"string","name":"bottoms","type":"string"},{"internalType":"string","name":"helmet","type":"string"},{"internalType":"string","name":"shield","type":"string"},{"internalType":"string","name":"weapon","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"vikingIdToRandomNumber","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"vikingStats","outputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"uint256","name":"boots","type":"uint256"},{"internalType":"uint256","name":"bottoms","type":"uint256"},{"internalType":"uint256","name":"helmet","type":"uint256"},{"internalType":"uint256","name":"shield","type":"uint256"},{"internalType":"uint256","name":"weapon","type":"uint256"},{"internalType":"uint256","name":"attack","type":"uint256"},{"internalType":"uint256","name":"defence","type":"uint256"},{"internalType":"uint256","name":"intelligence","type":"uint256"},{"internalType":"uint256","name":"speed","type":"uint256"},{"internalType":"uint256","name":"stamina","type":"uint256"},{"internalType":"uint256","name":"appearance","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"wETHContract","outputs":[{"internalType":"contract IWeth","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"wallet","type":"address"},{"internalType":"bool","name":"status","type":"bool"}],"name":"whitelist","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"}],"name":"withdrawErc20","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

0000000000000000000000003d2341adb2d31f1c5530cdc622016af293177ae0000000000000000000000000b0897686c545045afc77cf20ec7a532e3120e0f1f86195cf7690c55907b2b611ebb7343a6f649bff128701cc542f0569e2c549da

-----Decoded View---------------
Arg [0] : _VRFCoordinator (address): 0x3d2341adb2d31f1c5530cdc622016af293177ae0
Arg [1] : _LinkToken (address): 0xb0897686c545045afc77cf20ec7a532e3120e0f1
Arg [2] : _keyHash (bytes32): 0xf86195cf7690c55907b2b611ebb7343a6f649bff128701cc542f0569e2c549da

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000003d2341adb2d31f1c5530cdc622016af293177ae0
Arg [1] : 000000000000000000000000b0897686c545045afc77cf20ec7a532e3120e0f1
Arg [2] : f86195cf7690c55907b2b611ebb7343a6f649bff128701cc542f0569e2c549da


Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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