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ERC-20
Add Token to MetaMask (Web3)Overview
Max Total Supply
0 DWP
Holders
0
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 0 Decimals)
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| # | Exchange | Pair | Price | 24H Volume | % Volume |
|---|
Contract Name:
DWorldCore
Compiler Version
v0.4.18+commit.9cf6e910
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/**
*Submitted for verification at Etherscan.io on 2018-02-03
*/
pragma solidity ^0.4.18;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
assert(c / a == b);
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
/**
* @title Ownable
* @dev The Ownable contract has an owner address, and provides basic authorization control
* functions, this simplifies the implementation of "user permissions".
*/
contract Ownable {
address public owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
function Ownable() public {
owner = msg.sender;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) public onlyOwner {
require(newOwner != address(0));
OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
}
/**
* @title Claimable
* @dev Extension for the Ownable contract, where the ownership needs to be claimed.
* This allows the new owner to accept the transfer.
*/
contract Claimable is Ownable {
address public pendingOwner;
/**
* @dev Modifier throws if called by any account other than the pendingOwner.
*/
modifier onlyPendingOwner() {
require(msg.sender == pendingOwner);
_;
}
/**
* @dev Allows the current owner to set the pendingOwner address.
* @param newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) onlyOwner public {
pendingOwner = newOwner;
}
/**
* @dev Allows the pendingOwner address to finalize the transfer.
*/
function claimOwnership() onlyPendingOwner public {
OwnershipTransferred(owner, pendingOwner);
owner = pendingOwner;
pendingOwner = address(0);
}
}
/**
* @title Pausable
* @dev Base contract which allows children to implement an emergency stop mechanism.
*/
contract Pausable is Ownable {
event Pause();
event Unpause();
bool public paused = false;
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*/
modifier whenNotPaused() {
require(!paused);
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*/
modifier whenPaused() {
require(paused);
_;
}
/**
* @dev called by the owner to pause, triggers stopped state
*/
function pause() onlyOwner whenNotPaused public {
paused = true;
Pause();
}
/**
* @dev called by the owner to unpause, returns to normal state
*/
function unpause() onlyOwner whenPaused public {
paused = false;
Unpause();
}
}
/**
* @title ERC20Basic
* @dev Simpler version of ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/179
*/
contract ERC20Basic {
uint256 public totalSupply;
function balanceOf(address who) public view returns (uint256);
function transfer(address to, uint256 value) public returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
}
/**
* @title ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/20
*/
contract ERC20 is ERC20Basic {
function allowance(address owner, address spender) public view returns (uint256);
function transferFrom(address from, address to, uint256 value) public returns (bool);
function approve(address spender, uint256 value) public returns (bool);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure.
* To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
function safeTransfer(ERC20Basic token, address to, uint256 value) internal {
assert(token.transfer(to, value));
}
function safeTransferFrom(ERC20 token, address from, address to, uint256 value) internal {
assert(token.transferFrom(from, to, value));
}
function safeApprove(ERC20 token, address spender, uint256 value) internal {
assert(token.approve(spender, value));
}
}
/**
* @title Contracts that should be able to recover tokens
* @author SylTi
* @dev This allow a contract to recover any ERC20 token received in a contract by transferring the balance to the contract owner.
* This will prevent any accidental loss of tokens.
*/
contract CanReclaimToken is Ownable {
using SafeERC20 for ERC20Basic;
/**
* @dev Reclaim all ERC20Basic compatible tokens
* @param token ERC20Basic The address of the token contract
*/
function reclaimToken(ERC20Basic token) external onlyOwner {
uint256 balance = token.balanceOf(this);
token.safeTransfer(owner, balance);
}
}
/// @title Interface for contracts conforming to ERC-721: Deed Standard
/// @author William Entriken (https://phor.net), et al.
/// @dev Specification at https://github.com/ethereum/EIPs/pull/841 (DRAFT)
interface ERC721 {
// COMPLIANCE WITH ERC-165 (DRAFT) /////////////////////////////////////////
/// @dev ERC-165 (draft) interface signature for itself
// bytes4 internal constant INTERFACE_SIGNATURE_ERC165 = // 0x01ffc9a7
// bytes4(keccak256('supportsInterface(bytes4)'));
/// @dev ERC-165 (draft) interface signature for ERC721
// bytes4 internal constant INTERFACE_SIGNATURE_ERC721 = // 0xda671b9b
// bytes4(keccak256('ownerOf(uint256)')) ^
// bytes4(keccak256('countOfDeeds()')) ^
// bytes4(keccak256('countOfDeedsByOwner(address)')) ^
// bytes4(keccak256('deedOfOwnerByIndex(address,uint256)')) ^
// bytes4(keccak256('approve(address,uint256)')) ^
// bytes4(keccak256('takeOwnership(uint256)'));
/// @notice Query a contract to see if it supports a certain interface
/// @dev Returns `true` the interface is supported and `false` otherwise,
/// returns `true` for INTERFACE_SIGNATURE_ERC165 and
/// INTERFACE_SIGNATURE_ERC721, see ERC-165 for other interface signatures.
function supportsInterface(bytes4 _interfaceID) external pure returns (bool);
// PUBLIC QUERY FUNCTIONS //////////////////////////////////////////////////
/// @notice Find the owner of a deed
/// @param _deedId The identifier for a deed we are inspecting
/// @dev Deeds assigned to zero address are considered destroyed, and
/// queries about them do throw.
/// @return The non-zero address of the owner of deed `_deedId`, or `throw`
/// if deed `_deedId` is not tracked by this contract
function ownerOf(uint256 _deedId) external view returns (address _owner);
/// @notice Count deeds tracked by this contract
/// @return A count of the deeds tracked by this contract, where each one of
/// them has an assigned and queryable owner
function countOfDeeds() public view returns (uint256 _count);
/// @notice Count all deeds assigned to an owner
/// @dev Throws if `_owner` is the zero address, representing destroyed deeds.
/// @param _owner An address where we are interested in deeds owned by them
/// @return The number of deeds owned by `_owner`, possibly zero
function countOfDeedsByOwner(address _owner) public view returns (uint256 _count);
/// @notice Enumerate deeds assigned to an owner
/// @dev Throws if `_index` >= `countOfDeedsByOwner(_owner)` or if
/// `_owner` is the zero address, representing destroyed deeds.
/// @param _owner An address where we are interested in deeds owned by them
/// @param _index A counter between zero and `countOfDeedsByOwner(_owner)`,
/// inclusive
/// @return The identifier for the `_index`th deed assigned to `_owner`,
/// (sort order not specified)
function deedOfOwnerByIndex(address _owner, uint256 _index) external view returns (uint256 _deedId);
// TRANSFER MECHANISM //////////////////////////////////////////////////////
/// @dev This event emits when ownership of any deed changes by any
/// mechanism. This event emits when deeds are created (`from` == 0) and
/// destroyed (`to` == 0). Exception: during contract creation, any
/// transfers may occur without emitting `Transfer`.
event Transfer(address indexed from, address indexed to, uint256 indexed deedId);
/// @dev This event emits on any successful call to
/// `approve(address _spender, uint256 _deedId)`. Exception: does not emit
/// if an owner revokes approval (`_to` == 0x0) on a deed with no existing
/// approval.
event Approval(address indexed owner, address indexed approved, uint256 indexed deedId);
/// @notice Approve a new owner to take your deed, or revoke approval by
/// setting the zero address. You may `approve` any number of times while
/// the deed is assigned to you, only the most recent approval matters.
/// @dev Throws if `msg.sender` does not own deed `_deedId` or if `_to` ==
/// `msg.sender`.
/// @param _deedId The deed you are granting ownership of
function approve(address _to, uint256 _deedId) external;
/// @notice Become owner of a deed for which you are currently approved
/// @dev Throws if `msg.sender` is not approved to become the owner of
/// `deedId` or if `msg.sender` currently owns `_deedId`.
/// @param _deedId The deed that is being transferred
function takeOwnership(uint256 _deedId) external;
// SPEC EXTENSIONS /////////////////////////////////////////////////////////
/// @notice Transfer a deed to a new owner.
/// @dev Throws if `msg.sender` does not own deed `_deedId` or if
/// `_to` == 0x0.
/// @param _to The address of the new owner.
/// @param _deedId The deed you are transferring.
function transfer(address _to, uint256 _deedId) external;
}
/// @title Metadata extension to ERC-721 interface
/// @author William Entriken (https://phor.net)
/// @dev Specification at https://github.com/ethereum/EIPs/pull/841 (DRAFT)
interface ERC721Metadata {
/// @dev ERC-165 (draft) interface signature for ERC721
// bytes4 internal constant INTERFACE_SIGNATURE_ERC721Metadata = // 0x2a786f11
// bytes4(keccak256('name()')) ^
// bytes4(keccak256('symbol()')) ^
// bytes4(keccak256('deedUri(uint256)'));
/// @notice A descriptive name for a collection of deeds managed by this
/// contract
/// @dev Wallets and exchanges MAY display this to the end user.
function name() public pure returns (string _deedName);
/// @notice An abbreviated name for deeds managed by this contract
/// @dev Wallets and exchanges MAY display this to the end user.
function symbol() public pure returns (string _deedSymbol);
/// @notice A distinct URI (RFC 3986) for a given token.
/// @dev If:
/// * The URI is a URL
/// * The URL is accessible
/// * The URL points to a valid JSON file format (ECMA-404 2nd ed.)
/// * The JSON base element is an object
/// then these names of the base element SHALL have special meaning:
/// * "name": A string identifying the item to which `_deedId` grants
/// ownership
/// * "description": A string detailing the item to which `_deedId` grants
/// ownership
/// * "image": A URI pointing to a file of image/* mime type representing
/// the item to which `_deedId` grants ownership
/// Wallets and exchanges MAY display this to the end user.
/// Consider making any images at a width between 320 and 1080 pixels and
/// aspect ratio between 1.91:1 and 4:5 inclusive.
function deedUri(uint256 _deedId) external pure returns (string _uri);
}
/// @dev Implements access control to the DWorld contract.
contract DWorldAccessControl is Claimable, Pausable, CanReclaimToken {
address public cfoAddress;
function DWorldAccessControl() public {
// The creator of the contract is the initial CFO.
cfoAddress = msg.sender;
}
/// @dev Access modifier for CFO-only functionality.
modifier onlyCFO() {
require(msg.sender == cfoAddress);
_;
}
/// @dev Assigns a new address to act as the CFO. Only available to the current contract owner.
/// @param _newCFO The address of the new CFO.
function setCFO(address _newCFO) external onlyOwner {
require(_newCFO != address(0));
cfoAddress = _newCFO;
}
}
/// @dev Defines base data structures for DWorld.
contract DWorldBase is DWorldAccessControl {
using SafeMath for uint256;
/// @dev All minted plots (array of plot identifiers). There are
/// 2^16 * 2^16 possible plots (covering the entire world), thus
/// 32 bits are required. This fits in a uint32. Storing
/// the identifiers as uint32 instead of uint256 makes storage
/// cheaper. (The impact of this in mappings is less noticeable,
/// and using uint32 in the mappings below actually *increases*
/// gas cost for minting).
uint32[] public plots;
mapping (uint256 => address) identifierToOwner;
mapping (uint256 => address) identifierToApproved;
mapping (address => uint256) ownershipDeedCount;
// Boolean indicating whether the plot was bought before the migration.
mapping (uint256 => bool) public identifierIsOriginal;
/// @dev Event fired when a plot's data are changed. The plot
/// data are not stored in the contract directly, instead the
/// data are logged to the block. This gives significant
/// reductions in gas requirements (~75k for minting with data
/// instead of ~180k). However, it also means plot data are
/// not available from *within* other contracts.
event SetData(uint256 indexed deedId, string name, string description, string imageUrl, string infoUrl);
/// @notice Get all minted plots.
function getAllPlots() external view returns(uint32[]) {
return plots;
}
/// @dev Represent a 2D coordinate as a single uint.
/// @param x The x-coordinate.
/// @param y The y-coordinate.
function coordinateToIdentifier(uint256 x, uint256 y) public pure returns(uint256) {
require(validCoordinate(x, y));
return (y << 16) + x;
}
/// @dev Turn a single uint representation of a coordinate into its x and y parts.
/// @param identifier The uint representation of a coordinate.
function identifierToCoordinate(uint256 identifier) public pure returns(uint256 x, uint256 y) {
require(validIdentifier(identifier));
y = identifier >> 16;
x = identifier - (y << 16);
}
/// @dev Test whether the coordinate is valid.
/// @param x The x-part of the coordinate to test.
/// @param y The y-part of the coordinate to test.
function validCoordinate(uint256 x, uint256 y) public pure returns(bool) {
return x < 65536 && y < 65536; // 2^16
}
/// @dev Test whether an identifier is valid.
/// @param identifier The identifier to test.
function validIdentifier(uint256 identifier) public pure returns(bool) {
return identifier < 4294967296; // 2^16 * 2^16
}
/// @dev Set a plot's data.
/// @param identifier The identifier of the plot to set data for.
function _setPlotData(uint256 identifier, string name, string description, string imageUrl, string infoUrl) internal {
SetData(identifier, name, description, imageUrl, infoUrl);
}
}
/// @dev Holds deed functionality such as approving and transferring. Implements ERC721.
contract DWorldDeed is DWorldBase, ERC721, ERC721Metadata {
/// @notice Name of the collection of deeds (non-fungible token), as defined in ERC721Metadata.
function name() public pure returns (string _deedName) {
_deedName = "DWorld Plots";
}
/// @notice Symbol of the collection of deeds (non-fungible token), as defined in ERC721Metadata.
function symbol() public pure returns (string _deedSymbol) {
_deedSymbol = "DWP";
}
/// @dev ERC-165 (draft) interface signature for itself
bytes4 internal constant INTERFACE_SIGNATURE_ERC165 = // 0x01ffc9a7
bytes4(keccak256('supportsInterface(bytes4)'));
/// @dev ERC-165 (draft) interface signature for ERC721
bytes4 internal constant INTERFACE_SIGNATURE_ERC721 = // 0xda671b9b
bytes4(keccak256('ownerOf(uint256)')) ^
bytes4(keccak256('countOfDeeds()')) ^
bytes4(keccak256('countOfDeedsByOwner(address)')) ^
bytes4(keccak256('deedOfOwnerByIndex(address,uint256)')) ^
bytes4(keccak256('approve(address,uint256)')) ^
bytes4(keccak256('takeOwnership(uint256)'));
/// @dev ERC-165 (draft) interface signature for ERC721
bytes4 internal constant INTERFACE_SIGNATURE_ERC721Metadata = // 0x2a786f11
bytes4(keccak256('name()')) ^
bytes4(keccak256('symbol()')) ^
bytes4(keccak256('deedUri(uint256)'));
/// @notice Introspection interface as per ERC-165 (https://github.com/ethereum/EIPs/issues/165).
/// Returns true for any standardized interfaces implemented by this contract.
/// (ERC-165 and ERC-721.)
function supportsInterface(bytes4 _interfaceID) external pure returns (bool) {
return (
(_interfaceID == INTERFACE_SIGNATURE_ERC165)
|| (_interfaceID == INTERFACE_SIGNATURE_ERC721)
|| (_interfaceID == INTERFACE_SIGNATURE_ERC721Metadata)
);
}
/// @dev Checks if a given address owns a particular plot.
/// @param _owner The address of the owner to check for.
/// @param _deedId The plot identifier to check for.
function _owns(address _owner, uint256 _deedId) internal view returns (bool) {
return identifierToOwner[_deedId] == _owner;
}
/// @dev Approve a given address to take ownership of a deed.
/// @param _from The address approving taking ownership.
/// @param _to The address to approve taking ownership.
/// @param _deedId The identifier of the deed to give approval for.
function _approve(address _from, address _to, uint256 _deedId) internal {
identifierToApproved[_deedId] = _to;
// Emit event.
Approval(_from, _to, _deedId);
}
/// @dev Checks if a given address has approval to take ownership of a deed.
/// @param _claimant The address of the claimant to check for.
/// @param _deedId The identifier of the deed to check for.
function _approvedFor(address _claimant, uint256 _deedId) internal view returns (bool) {
return identifierToApproved[_deedId] == _claimant;
}
/// @dev Assigns ownership of a specific deed to an address.
/// @param _from The address to transfer the deed from.
/// @param _to The address to transfer the deed to.
/// @param _deedId The identifier of the deed to transfer.
function _transfer(address _from, address _to, uint256 _deedId) internal {
// The number of plots is capped at 2^16 * 2^16, so this cannot
// be overflowed.
ownershipDeedCount[_to]++;
// Transfer ownership.
identifierToOwner[_deedId] = _to;
// When a new deed is minted, the _from address is 0x0, but we
// do not track deed ownership of 0x0.
if (_from != address(0)) {
ownershipDeedCount[_from]--;
// Clear taking ownership approval.
delete identifierToApproved[_deedId];
}
// Emit the transfer event.
Transfer(_from, _to, _deedId);
}
// ERC 721 implementation
/// @notice Returns the total number of deeds currently in existence.
/// @dev Required for ERC-721 compliance.
function countOfDeeds() public view returns (uint256) {
return plots.length;
}
/// @notice Returns the number of deeds owned by a specific address.
/// @param _owner The owner address to check.
/// @dev Required for ERC-721 compliance
function countOfDeedsByOwner(address _owner) public view returns (uint256) {
return ownershipDeedCount[_owner];
}
/// @notice Returns the address currently assigned ownership of a given deed.
/// @dev Required for ERC-721 compliance.
function ownerOf(uint256 _deedId) external view returns (address _owner) {
_owner = identifierToOwner[_deedId];
require(_owner != address(0));
}
/// @notice Approve a given address to take ownership of a deed.
/// @param _to The address to approve taking owernship.
/// @param _deedId The identifier of the deed to give approval for.
/// @dev Required for ERC-721 compliance.
function approve(address _to, uint256 _deedId) external whenNotPaused {
uint256[] memory _deedIds = new uint256[](1);
_deedIds[0] = _deedId;
approveMultiple(_to, _deedIds);
}
/// @notice Approve a given address to take ownership of multiple deeds.
/// @param _to The address to approve taking ownership.
/// @param _deedIds The identifiers of the deeds to give approval for.
function approveMultiple(address _to, uint256[] _deedIds) public whenNotPaused {
// Ensure the sender is not approving themselves.
require(msg.sender != _to);
for (uint256 i = 0; i < _deedIds.length; i++) {
uint256 _deedId = _deedIds[i];
// Require the sender is the owner of the deed.
require(_owns(msg.sender, _deedId));
// Perform the approval.
_approve(msg.sender, _to, _deedId);
}
}
/// @notice Transfer a deed to another address. If transferring to a smart
/// contract be VERY CAREFUL to ensure that it is aware of ERC-721, or your
/// deed may be lost forever.
/// @param _to The address of the recipient, can be a user or contract.
/// @param _deedId The identifier of the deed to transfer.
/// @dev Required for ERC-721 compliance.
function transfer(address _to, uint256 _deedId) external whenNotPaused {
uint256[] memory _deedIds = new uint256[](1);
_deedIds[0] = _deedId;
transferMultiple(_to, _deedIds);
}
/// @notice Transfers multiple deeds to another address. If transferring to
/// a smart contract be VERY CAREFUL to ensure that it is aware of ERC-721,
/// or your deeds may be lost forever.
/// @param _to The address of the recipient, can be a user or contract.
/// @param _deedIds The identifiers of the deeds to transfer.
function transferMultiple(address _to, uint256[] _deedIds) public whenNotPaused {
// Safety check to prevent against an unexpected 0x0 default.
require(_to != address(0));
// Disallow transfers to this contract to prevent accidental misuse.
require(_to != address(this));
for (uint256 i = 0; i < _deedIds.length; i++) {
uint256 _deedId = _deedIds[i];
// One can only transfer their own plots.
require(_owns(msg.sender, _deedId));
// Transfer ownership
_transfer(msg.sender, _to, _deedId);
}
}
/// @notice Transfer a deed owned by another address, for which the calling
/// address has previously been granted transfer approval by the owner.
/// @param _deedId The identifier of the deed to be transferred.
/// @dev Required for ERC-721 compliance.
function takeOwnership(uint256 _deedId) external whenNotPaused {
uint256[] memory _deedIds = new uint256[](1);
_deedIds[0] = _deedId;
takeOwnershipMultiple(_deedIds);
}
/// @notice Transfer multiple deeds owned by another address, for which the
/// calling address has previously been granted transfer approval by the owner.
/// @param _deedIds The identifier of the deed to be transferred.
function takeOwnershipMultiple(uint256[] _deedIds) public whenNotPaused {
for (uint256 i = 0; i < _deedIds.length; i++) {
uint256 _deedId = _deedIds[i];
address _from = identifierToOwner[_deedId];
// Check for transfer approval
require(_approvedFor(msg.sender, _deedId));
// Reassign ownership (also clears pending approvals and emits Transfer event).
_transfer(_from, msg.sender, _deedId);
}
}
/// @notice Returns a list of all deed identifiers assigned to an address.
/// @param _owner The owner whose deeds we are interested in.
/// @dev This method MUST NEVER be called by smart contract code. It's very
/// expensive and is not supported in contract-to-contract calls as it returns
/// a dynamic array (only supported for web3 calls).
function deedsOfOwner(address _owner) external view returns(uint256[]) {
uint256 deedCount = countOfDeedsByOwner(_owner);
if (deedCount == 0) {
// Return an empty array.
return new uint256[](0);
} else {
uint256[] memory result = new uint256[](deedCount);
uint256 totalDeeds = countOfDeeds();
uint256 resultIndex = 0;
for (uint256 deedNumber = 0; deedNumber < totalDeeds; deedNumber++) {
uint256 identifier = plots[deedNumber];
if (identifierToOwner[identifier] == _owner) {
result[resultIndex] = identifier;
resultIndex++;
}
}
return result;
}
}
/// @notice Returns a deed identifier of the owner at the given index.
/// @param _owner The address of the owner we want to get a deed for.
/// @param _index The index of the deed we want.
function deedOfOwnerByIndex(address _owner, uint256 _index) external view returns (uint256) {
// The index should be valid.
require(_index < countOfDeedsByOwner(_owner));
// Loop through all plots, accounting the number of plots of the owner we've seen.
uint256 seen = 0;
uint256 totalDeeds = countOfDeeds();
for (uint256 deedNumber = 0; deedNumber < totalDeeds; deedNumber++) {
uint256 identifier = plots[deedNumber];
if (identifierToOwner[identifier] == _owner) {
if (seen == _index) {
return identifier;
}
seen++;
}
}
}
/// @notice Returns an (off-chain) metadata url for the given deed.
/// @param _deedId The identifier of the deed to get the metadata
/// url for.
/// @dev Implementation of optional ERC-721 functionality.
function deedUri(uint256 _deedId) external pure returns (string uri) {
require(validIdentifier(_deedId));
var (x, y) = identifierToCoordinate(_deedId);
// Maximum coordinate length in decimals is 5 (65535)
uri = "https://dworld.io/plot/xxxxx/xxxxx";
bytes memory _uri = bytes(uri);
for (uint256 i = 0; i < 5; i++) {
_uri[27 - i] = byte(48 + (x / 10 ** i) % 10);
_uri[33 - i] = byte(48 + (y / 10 ** i) % 10);
}
}
}
/// @dev Holds functionality for finance related to plots.
contract DWorldFinance is DWorldDeed {
/// Total amount of Ether yet to be paid to auction beneficiaries.
uint256 public outstandingEther = 0 ether;
/// Amount of Ether yet to be paid per beneficiary.
mapping (address => uint256) public addressToEtherOwed;
/// Base price for unclaimed plots.
uint256 public unclaimedPlotPrice = 0.0125 ether;
/// Dividend per plot surrounding a new claim, in 1/1000th of percentages
/// of the base unclaimed plot price.
uint256 public claimDividendPercentage = 50000;
/// Percentage of the buyout price that goes towards dividends.
uint256 public buyoutDividendPercentage = 5000;
/// Buyout fee in 1/1000th of a percentage.
uint256 public buyoutFeePercentage = 3500;
/// Number of free claims per address.
mapping (address => uint256) freeClaimAllowance;
/// Initial price paid for a plot.
mapping (uint256 => uint256) public initialPricePaid;
/// Current plot price.
mapping (uint256 => uint256) public identifierToBuyoutPrice;
/// Boolean indicating whether the plot has been bought out at least once.
mapping (uint256 => bool) identifierToBoughtOutOnce;
/// @dev Event fired when dividend is paid for a new plot claim.
event ClaimDividend(address indexed from, address indexed to, uint256 deedIdFrom, uint256 indexed deedIdTo, uint256 dividend);
/// @dev Event fired when a buyout is performed.
event Buyout(address indexed buyer, address indexed seller, uint256 indexed deedId, uint256 winnings, uint256 totalCost, uint256 newPrice);
/// @dev Event fired when dividend is paid for a buyout.
event BuyoutDividend(address indexed from, address indexed to, uint256 deedIdFrom, uint256 indexed deedIdTo, uint256 dividend);
/// @dev Event fired when the buyout price is manually changed for a plot.
event SetBuyoutPrice(uint256 indexed deedId, uint256 newPrice);
/// @dev The time after which buyouts will be enabled. Set in the DWorldCore constructor.
uint256 public buyoutsEnabledFromTimestamp;
/// @notice Sets the new price for unclaimed plots.
/// @param _unclaimedPlotPrice The new price for unclaimed plots.
function setUnclaimedPlotPrice(uint256 _unclaimedPlotPrice) external onlyCFO {
unclaimedPlotPrice = _unclaimedPlotPrice;
}
/// @notice Sets the new dividend percentage for unclaimed plots.
/// @param _claimDividendPercentage The new dividend percentage for unclaimed plots.
function setClaimDividendPercentage(uint256 _claimDividendPercentage) external onlyCFO {
// Claim dividend percentage must be 10% at the least.
// Claim dividend percentage may be 100% at the most.
require(10000 <= _claimDividendPercentage && _claimDividendPercentage <= 100000);
claimDividendPercentage = _claimDividendPercentage;
}
/// @notice Sets the new dividend percentage for buyouts.
/// @param _buyoutDividendPercentage The new dividend percentage for buyouts.
function setBuyoutDividendPercentage(uint256 _buyoutDividendPercentage) external onlyCFO {
// Buyout dividend must be 2% at the least.
// Buyout dividend percentage may be 12.5% at the most.
require(2000 <= _buyoutDividendPercentage && _buyoutDividendPercentage <= 12500);
buyoutDividendPercentage = _buyoutDividendPercentage;
}
/// @notice Sets the new fee percentage for buyouts.
/// @param _buyoutFeePercentage The new fee percentage for buyouts.
function setBuyoutFeePercentage(uint256 _buyoutFeePercentage) external onlyCFO {
// Buyout fee may be 5% at the most.
require(0 <= _buyoutFeePercentage && _buyoutFeePercentage <= 5000);
buyoutFeePercentage = _buyoutFeePercentage;
}
/// @notice The claim dividend to be paid for each adjacent plot, and
/// as a flat dividend for each buyout.
function claimDividend() public view returns (uint256) {
return unclaimedPlotPrice.mul(claimDividendPercentage).div(100000);
}
/// @notice Set the free claim allowance for an address.
/// @param addr The address to set the free claim allowance for.
/// @param allowance The free claim allowance to set.
function setFreeClaimAllowance(address addr, uint256 allowance) external onlyCFO {
freeClaimAllowance[addr] = allowance;
}
/// @notice Get the free claim allowance of an address.
/// @param addr The address to get the free claim allowance of.
function freeClaimAllowanceOf(address addr) external view returns (uint256) {
return freeClaimAllowance[addr];
}
/// @dev Assign balance to an account.
/// @param addr The address to assign balance to.
/// @param amount The amount to assign.
function _assignBalance(address addr, uint256 amount) internal {
addressToEtherOwed[addr] = addressToEtherOwed[addr].add(amount);
outstandingEther = outstandingEther.add(amount);
}
/// @dev Find the _claimed_ plots surrounding a plot.
/// @param _deedId The identifier of the plot to get the surrounding plots for.
function _claimedSurroundingPlots(uint256 _deedId) internal view returns (uint256[] memory) {
var (x, y) = identifierToCoordinate(_deedId);
// Find all claimed surrounding plots.
uint256 claimed = 0;
// Create memory buffer capable of holding all plots.
uint256[] memory _plots = new uint256[](8);
// Loop through all neighbors.
for (int256 dx = -1; dx <= 1; dx++) {
for (int256 dy = -1; dy <= 1; dy++) {
if (dx == 0 && dy == 0) {
// Skip the center (i.e., the plot itself).
continue;
}
// Get the coordinates of this neighboring identifier.
uint256 neighborIdentifier = coordinateToIdentifier(
uint256(int256(x) + dx) % 65536,
uint256(int256(y) + dy) % 65536
);
if (identifierToOwner[neighborIdentifier] != 0x0) {
_plots[claimed] = neighborIdentifier;
claimed++;
}
}
}
// Memory arrays cannot be resized, so copy all
// plots from the buffer to the plot array.
uint256[] memory plots = new uint256[](claimed);
for (uint256 i = 0; i < claimed; i++) {
plots[i] = _plots[i];
}
return plots;
}
/// @dev Assign claim dividend to an address.
/// @param _from The address who paid the dividend.
/// @param _to The dividend beneficiary.
/// @param _deedIdFrom The identifier of the deed the dividend is being paid for.
/// @param _deedIdTo The identifier of the deed the dividend is being paid to.
function _assignClaimDividend(address _from, address _to, uint256 _deedIdFrom, uint256 _deedIdTo) internal {
uint256 _claimDividend = claimDividend();
// Trigger event.
ClaimDividend(_from, _to, _deedIdFrom, _deedIdTo, _claimDividend);
// Assign the dividend.
_assignBalance(_to, _claimDividend);
}
/// @dev Calculate and assign the dividend payable for the new plot claim.
/// A new claim pays dividends to all existing surrounding plots.
/// @param _deedId The identifier of the new plot to calculate and assign dividends for.
/// Assumed to be valid.
function _calculateAndAssignClaimDividends(uint256 _deedId)
internal
returns (uint256 totalClaimDividend)
{
// Get existing surrounding plots.
uint256[] memory claimedSurroundingPlots = _claimedSurroundingPlots(_deedId);
// Keep track of the claim dividend.
uint256 _claimDividend = claimDividend();
totalClaimDividend = 0;
// Assign claim dividend.
for (uint256 i = 0; i < claimedSurroundingPlots.length; i++) {
if (identifierToOwner[claimedSurroundingPlots[i]] != msg.sender) {
totalClaimDividend = totalClaimDividend.add(_claimDividend);
_assignClaimDividend(msg.sender, identifierToOwner[claimedSurroundingPlots[i]], _deedId, claimedSurroundingPlots[i]);
}
}
}
/// @dev Calculate the next buyout price given the current total buyout cost.
/// @param totalCost The current total buyout cost.
function nextBuyoutPrice(uint256 totalCost) public pure returns (uint256) {
if (totalCost < 0.05 ether) {
return totalCost * 2;
} else if (totalCost < 0.2 ether) {
return totalCost * 170 / 100; // * 1.7
} else if (totalCost < 0.5 ether) {
return totalCost * 150 / 100; // * 1.5
} else {
return totalCost.mul(125).div(100); // * 1.25
}
}
/// @notice Get the buyout cost for a given plot.
/// @param _deedId The identifier of the plot to get the buyout cost for.
function buyoutCost(uint256 _deedId) external view returns (uint256) {
// The current buyout price.
uint256 price = identifierToBuyoutPrice[_deedId];
// Get existing surrounding plots.
uint256[] memory claimedSurroundingPlots = _claimedSurroundingPlots(_deedId);
// The total cost is the price plus flat rate dividends based on claim dividends.
uint256 flatDividends = claimDividend().mul(claimedSurroundingPlots.length);
return price.add(flatDividends);
}
/// @dev Assign the proceeds of the buyout.
/// @param _deedId The identifier of the plot that is being bought out.
function _assignBuyoutProceeds(
address currentOwner,
uint256 _deedId,
uint256[] memory claimedSurroundingPlots,
uint256 currentOwnerWinnings,
uint256 totalDividendPerBeneficiary,
uint256 totalCost
)
internal
{
// Calculate and assign the current owner's winnings.
Buyout(msg.sender, currentOwner, _deedId, currentOwnerWinnings, totalCost, nextBuyoutPrice(totalCost));
_assignBalance(currentOwner, currentOwnerWinnings);
// Assign dividends to owners of surrounding plots.
for (uint256 i = 0; i < claimedSurroundingPlots.length; i++) {
address beneficiary = identifierToOwner[claimedSurroundingPlots[i]];
BuyoutDividend(msg.sender, beneficiary, _deedId, claimedSurroundingPlots[i], totalDividendPerBeneficiary);
_assignBalance(beneficiary, totalDividendPerBeneficiary);
}
}
/// @dev Calculate and assign the proceeds from the buyout.
/// @param currentOwner The current owner of the plot that is being bought out.
/// @param _deedId The identifier of the plot that is being bought out.
/// @param claimedSurroundingPlots The surrounding plots that have been claimed.
function _calculateAndAssignBuyoutProceeds(address currentOwner, uint256 _deedId, uint256[] memory claimedSurroundingPlots)
internal
returns (uint256 totalCost)
{
// The current price.
uint256 price = identifierToBuyoutPrice[_deedId];
// The total cost is the price plus flat rate dividends based on claim dividends.
uint256 flatDividends = claimDividend().mul(claimedSurroundingPlots.length);
totalCost = price.add(flatDividends);
// Calculate the variable dividends based on the buyout price
// (only to be paid if there are surrounding plots).
uint256 variableDividends = price.mul(buyoutDividendPercentage).div(100000);
// Calculate fees.
uint256 fee = price.mul(buyoutFeePercentage).div(100000);
// Calculate and assign buyout proceeds.
uint256 currentOwnerWinnings = price.sub(fee);
uint256 totalDividendPerBeneficiary;
if (claimedSurroundingPlots.length > 0) {
// If there are surrounding plots, variable dividend is to be paid
// based on the buyout price..
currentOwnerWinnings = currentOwnerWinnings.sub(variableDividends);
// Calculate the dividend per surrounding plot.
totalDividendPerBeneficiary = flatDividends.add(variableDividends) / claimedSurroundingPlots.length;
}
_assignBuyoutProceeds(
currentOwner,
_deedId,
claimedSurroundingPlots,
currentOwnerWinnings,
totalDividendPerBeneficiary,
totalCost
);
}
/// @notice Buy the current owner out of the plot.
function buyout(uint256 _deedId) external payable whenNotPaused {
buyoutWithData(_deedId, "", "", "", "");
}
/// @notice Buy the current owner out of the plot.
function buyoutWithData(uint256 _deedId, string name, string description, string imageUrl, string infoUrl)
public
payable
whenNotPaused
{
// Buyouts must be enabled.
require(buyoutsEnabledFromTimestamp <= block.timestamp);
address currentOwner = identifierToOwner[_deedId];
// The plot must be owned before it can be bought out.
require(currentOwner != 0x0);
// Get existing surrounding plots.
uint256[] memory claimedSurroundingPlots = _claimedSurroundingPlots(_deedId);
// Assign the buyout proceeds and retrieve the total cost.
uint256 totalCost = _calculateAndAssignBuyoutProceeds(currentOwner, _deedId, claimedSurroundingPlots);
// Ensure the message has enough value.
require(msg.value >= totalCost);
// Transfer the plot.
_transfer(currentOwner, msg.sender, _deedId);
// Set the plot data
SetData(_deedId, name, description, imageUrl, infoUrl);
// Calculate and set the new plot price.
identifierToBuyoutPrice[_deedId] = nextBuyoutPrice(totalCost);
// Indicate the plot has been bought out at least once
if (!identifierToBoughtOutOnce[_deedId]) {
identifierToBoughtOutOnce[_deedId] = true;
}
// Calculate the excess Ether sent.
// msg.value is greater than or equal to totalCost,
// so this cannot underflow.
uint256 excess = msg.value - totalCost;
if (excess > 0) {
// Refund any excess Ether (not susceptible to re-entry attack, as
// the owner is assigned before the transfer takes place).
msg.sender.transfer(excess);
}
}
/// @notice Calculate the maximum initial buyout price for a plot.
/// @param _deedId The identifier of the plot to get the maximum initial buyout price for.
function maximumInitialBuyoutPrice(uint256 _deedId) public view returns (uint256) {
// The initial buyout price can be set to 4x the initial plot price
// (or 100x for the original pre-migration plots).
uint256 mul = 4;
if (identifierIsOriginal[_deedId]) {
mul = 100;
}
return initialPricePaid[_deedId].mul(mul);
}
/// @notice Test whether a buyout price is valid.
/// @param _deedId The identifier of the plot to test the buyout price for.
/// @param price The buyout price to test.
function validInitialBuyoutPrice(uint256 _deedId, uint256 price) public view returns (bool) {
return (price >= unclaimedPlotPrice && price <= maximumInitialBuyoutPrice(_deedId));
}
/// @notice Manually set the initial buyout price of a plot.
/// @param _deedId The identifier of the plot to set the buyout price for.
/// @param price The value to set the buyout price to.
function setInitialBuyoutPrice(uint256 _deedId, uint256 price) public whenNotPaused {
// One can only set the buyout price of their own plots.
require(_owns(msg.sender, _deedId));
// The initial buyout price can only be set if the plot has never been bought out before.
require(!identifierToBoughtOutOnce[_deedId]);
// The buyout price must be valid.
require(validInitialBuyoutPrice(_deedId, price));
// Set the buyout price.
identifierToBuyoutPrice[_deedId] = price;
// Trigger the buyout price event.
SetBuyoutPrice(_deedId, price);
}
}
/// @dev Holds functionality for minting new plot deeds.
contract DWorldMinting is DWorldFinance {
/// @notice Buy an unclaimed plot.
/// @param _deedId The unclaimed plot to buy.
/// @param _buyoutPrice The initial buyout price to set on the plot.
function claimPlot(uint256 _deedId, uint256 _buyoutPrice) external payable whenNotPaused {
claimPlotWithData(_deedId, _buyoutPrice, "", "", "", "");
}
/// @notice Buy an unclaimed plot.
/// @param _deedId The unclaimed plot to buy.
/// @param _buyoutPrice The initial buyout price to set on the plot.
/// @param name The name to give the plot.
/// @param description The description to add to the plot.
/// @param imageUrl The image url for the plot.
/// @param infoUrl The info url for the plot.
function claimPlotWithData(uint256 _deedId, uint256 _buyoutPrice, string name, string description, string imageUrl, string infoUrl) public payable whenNotPaused {
uint256[] memory _deedIds = new uint256[](1);
_deedIds[0] = _deedId;
claimPlotMultipleWithData(_deedIds, _buyoutPrice, name, description, imageUrl, infoUrl);
}
/// @notice Buy unclaimed plots.
/// @param _deedIds The unclaimed plots to buy.
/// @param _buyoutPrice The initial buyout price to set on the plot.
function claimPlotMultiple(uint256[] _deedIds, uint256 _buyoutPrice) external payable whenNotPaused {
claimPlotMultipleWithData(_deedIds, _buyoutPrice, "", "", "", "");
}
/// @notice Buy unclaimed plots.
/// @param _deedIds The unclaimed plots to buy.
/// @param _buyoutPrice The initial buyout price to set on the plot.
/// @param name The name to give the plots.
/// @param description The description to add to the plots.
/// @param imageUrl The image url for the plots.
/// @param infoUrl The info url for the plots.
function claimPlotMultipleWithData(uint256[] _deedIds, uint256 _buyoutPrice, string name, string description, string imageUrl, string infoUrl) public payable whenNotPaused {
uint256 buyAmount = _deedIds.length;
uint256 etherRequired;
if (freeClaimAllowance[msg.sender] > 0) {
// The sender has a free claim allowance.
if (freeClaimAllowance[msg.sender] > buyAmount) {
// Subtract from allowance.
freeClaimAllowance[msg.sender] -= buyAmount;
// No ether is required.
etherRequired = 0;
} else {
uint256 freeAmount = freeClaimAllowance[msg.sender];
// The full allowance has been used.
delete freeClaimAllowance[msg.sender];
// The subtraction cannot underflow, as freeAmount <= buyAmount.
etherRequired = unclaimedPlotPrice.mul(buyAmount - freeAmount);
}
} else {
// The sender does not have a free claim allowance.
etherRequired = unclaimedPlotPrice.mul(buyAmount);
}
uint256 offset = plots.length;
// Allocate additional memory for the plots array
// (this is more efficient than .push-ing each individual
// plot, as that requires multiple dynamic allocations).
plots.length = plots.length.add(_deedIds.length);
for (uint256 i = 0; i < _deedIds.length; i++) {
uint256 _deedId = _deedIds[i];
require(validIdentifier(_deedId));
// The plot must be unowned (a plot deed cannot be transferred to
// 0x0, so once a plot is claimed it will always be owned by a
// non-zero address).
require(identifierToOwner[_deedId] == address(0));
// Create the plot
plots[offset + i] = uint32(_deedId);
// Transfer the new plot to the sender.
_transfer(address(0), msg.sender, _deedId);
// Set the plot data.
_setPlotData(_deedId, name, description, imageUrl, infoUrl);
// Calculate and assign claim dividends.
uint256 claimDividends = _calculateAndAssignClaimDividends(_deedId);
etherRequired = etherRequired.add(claimDividends);
// Set the initial price paid for the plot.
initialPricePaid[_deedId] = unclaimedPlotPrice.add(claimDividends);
// Set the initial buyout price. Throws if it does not succeed.
setInitialBuyoutPrice(_deedId, _buyoutPrice);
}
// Ensure enough ether is supplied.
require(msg.value >= etherRequired);
// Calculate the excess ether sent
// msg.value is greater than or equal to etherRequired,
// so this cannot underflow.
uint256 excess = msg.value - etherRequired;
if (excess > 0) {
// Refund any excess ether (not susceptible to re-entry attack, as
// the owner is assigned before the transfer takes place).
msg.sender.transfer(excess);
}
}
}
/// @title The internal clock auction functionality.
/// Inspired by CryptoKitties' clock auction
contract ClockAuctionBase {
// Address of the ERC721 contract this auction is linked to.
ERC721 public deedContract;
// Fee per successful auction in 1/1000th of a percentage.
uint256 public fee;
// Total amount of ether yet to be paid to auction beneficiaries.
uint256 public outstandingEther = 0 ether;
// Amount of ether yet to be paid per beneficiary.
mapping (address => uint256) public addressToEtherOwed;
/// @dev Represents a deed auction.
/// Care has been taken to ensure the auction fits in
/// two 256-bit words.
struct Auction {
address seller;
uint128 startPrice;
uint128 endPrice;
uint64 duration;
uint64 startedAt;
}
mapping (uint256 => Auction) identifierToAuction;
// Events
event AuctionCreated(address indexed seller, uint256 indexed deedId, uint256 startPrice, uint256 endPrice, uint256 duration);
event AuctionSuccessful(address indexed buyer, uint256 indexed deedId, uint256 totalPrice);
event AuctionCancelled(uint256 indexed deedId);
/// @dev Modifier to check whether the value can be stored in a 64 bit uint.
modifier fitsIn64Bits(uint256 _value) {
require (_value == uint256(uint64(_value)));
_;
}
/// @dev Modifier to check whether the value can be stored in a 128 bit uint.
modifier fitsIn128Bits(uint256 _value) {
require (_value == uint256(uint128(_value)));
_;
}
function ClockAuctionBase(address _deedContractAddress, uint256 _fee) public {
deedContract = ERC721(_deedContractAddress);
// Contract must indicate support for ERC721 through its interface signature.
require(deedContract.supportsInterface(0xda671b9b));
// Fee must be between 0 and 100%.
require(0 <= _fee && _fee <= 100000);
fee = _fee;
}
/// @dev Checks whether the given auction is active.
/// @param auction The auction to check for activity.
function _activeAuction(Auction storage auction) internal view returns (bool) {
return auction.startedAt > 0;
}
/// @dev Put the deed into escrow, thereby taking ownership of it.
/// @param _deedId The identifier of the deed to place into escrow.
function _escrow(uint256 _deedId) internal {
// Throws if the transfer fails
deedContract.takeOwnership(_deedId);
}
/// @dev Create the auction.
/// @param _deedId The identifier of the deed to create the auction for.
/// @param auction The auction to create.
function _createAuction(uint256 _deedId, Auction auction) internal {
// Add the auction to the auction mapping.
identifierToAuction[_deedId] = auction;
// Trigger auction created event.
AuctionCreated(auction.seller, _deedId, auction.startPrice, auction.endPrice, auction.duration);
}
/// @dev Bid on an auction.
/// @param _buyer The address of the buyer.
/// @param _value The value sent by the sender (in ether).
/// @param _deedId The identifier of the deed to bid on.
function _bid(address _buyer, uint256 _value, uint256 _deedId) internal {
Auction storage auction = identifierToAuction[_deedId];
// The auction must be active.
require(_activeAuction(auction));
// Calculate the auction's current price.
uint256 price = _currentPrice(auction);
// Make sure enough funds were sent.
require(_value >= price);
address seller = auction.seller;
if (price > 0) {
uint256 totalFee = _calculateFee(price);
uint256 proceeds = price - totalFee;
// Assign the proceeds to the seller.
// We do not send the proceeds directly, as to prevent
// malicious sellers from denying auctions (and burning
// the buyer's gas).
_assignProceeds(seller, proceeds);
}
AuctionSuccessful(_buyer, _deedId, price);
// The bid was won!
_winBid(seller, _buyer, _deedId, price);
// Remove the auction (we do this at the end, as
// winBid might require some additional information
// that will be removed when _removeAuction is
// called. As we do not transfer funds here, we do
// not have to worry about re-entry attacks.
_removeAuction(_deedId);
}
/// @dev Perform the bid win logic (in this case: transfer the deed).
/// @param _seller The address of the seller.
/// @param _winner The address of the winner.
/// @param _deedId The identifier of the deed.
/// @param _price The price the auction was bought at.
function _winBid(address _seller, address _winner, uint256 _deedId, uint256 _price) internal {
_transfer(_winner, _deedId);
}
/// @dev Cancel an auction.
/// @param _deedId The identifier of the deed for which the auction should be cancelled.
/// @param auction The auction to cancel.
function _cancelAuction(uint256 _deedId, Auction auction) internal {
// Remove the auction
_removeAuction(_deedId);
// Transfer the deed back to the seller
_transfer(auction.seller, _deedId);
// Trigger auction cancelled event.
AuctionCancelled(_deedId);
}
/// @dev Remove an auction.
/// @param _deedId The identifier of the deed for which the auction should be removed.
function _removeAuction(uint256 _deedId) internal {
delete identifierToAuction[_deedId];
}
/// @dev Transfer a deed owned by this contract to another address.
/// @param _to The address to transfer the deed to.
/// @param _deedId The identifier of the deed.
function _transfer(address _to, uint256 _deedId) internal {
// Throws if the transfer fails
deedContract.transfer(_to, _deedId);
}
/// @dev Assign proceeds to an address.
/// @param _to The address to assign proceeds to.
/// @param _value The proceeds to assign.
function _assignProceeds(address _to, uint256 _value) internal {
outstandingEther += _value;
addressToEtherOwed[_to] += _value;
}
/// @dev Calculate the current price of an auction.
function _currentPrice(Auction storage _auction) internal view returns (uint256) {
require(now >= _auction.startedAt);
uint256 secondsPassed = now - _auction.startedAt;
if (secondsPassed >= _auction.duration) {
return _auction.endPrice;
} else {
// Negative if the end price is higher than the start price!
int256 totalPriceChange = int256(_auction.endPrice) - int256(_auction.startPrice);
// Calculate the current price based on the total change over the entire
// auction duration, and the amount of time passed since the start of the
// auction.
int256 currentPriceChange = totalPriceChange * int256(secondsPassed) / int256(_auction.duration);
// Calculate the final price. Note this once again
// is representable by a uint256, as the price can
// never be negative.
int256 price = int256(_auction.startPrice) + currentPriceChange;
// This never throws.
assert(price >= 0);
return uint256(price);
}
}
/// @dev Calculate the fee for a given price.
/// @param _price The price to calculate the fee for.
function _calculateFee(uint256 _price) internal view returns (uint256) {
// _price is guaranteed to fit in a uint128 due to the createAuction entry
// modifiers, so this cannot overflow.
return _price * fee / 100000;
}
}
contract ClockAuction is ClockAuctionBase, Pausable {
function ClockAuction(address _deedContractAddress, uint256 _fee)
ClockAuctionBase(_deedContractAddress, _fee)
public
{}
/// @notice Update the auction fee.
/// @param _fee The new fee.
function setFee(uint256 _fee) external onlyOwner {
require(0 <= _fee && _fee <= 100000);
fee = _fee;
}
/// @notice Get the auction for the given deed.
/// @param _deedId The identifier of the deed to get the auction for.
/// @dev Throws if there is no auction for the given deed.
function getAuction(uint256 _deedId) external view returns (
address seller,
uint256 startPrice,
uint256 endPrice,
uint256 duration,
uint256 startedAt
)
{
Auction storage auction = identifierToAuction[_deedId];
// The auction must be active
require(_activeAuction(auction));
return (
auction.seller,
auction.startPrice,
auction.endPrice,
auction.duration,
auction.startedAt
);
}
/// @notice Create an auction for a given deed.
/// Must previously have been given approval to take ownership of the deed.
/// @param _deedId The identifier of the deed to create an auction for.
/// @param _startPrice The starting price of the auction.
/// @param _endPrice The ending price of the auction.
/// @param _duration The duration in seconds of the dynamic pricing part of the auction.
function createAuction(uint256 _deedId, uint256 _startPrice, uint256 _endPrice, uint256 _duration)
public
fitsIn128Bits(_startPrice)
fitsIn128Bits(_endPrice)
fitsIn64Bits(_duration)
whenNotPaused
{
// Get the owner of the deed to be auctioned
address deedOwner = deedContract.ownerOf(_deedId);
// Caller must either be the deed contract or the owner of the deed
// to prevent abuse.
require(
msg.sender == address(deedContract) ||
msg.sender == deedOwner
);
// The duration of the auction must be at least 60 seconds.
require(_duration >= 60);
// Throws if placing the deed in escrow fails (the contract requires
// transfer approval prior to creating the auction).
_escrow(_deedId);
// Auction struct
Auction memory auction = Auction(
deedOwner,
uint128(_startPrice),
uint128(_endPrice),
uint64(_duration),
uint64(now)
);
_createAuction(_deedId, auction);
}
/// @notice Cancel an auction
/// @param _deedId The identifier of the deed to cancel the auction for.
function cancelAuction(uint256 _deedId) external whenNotPaused {
Auction storage auction = identifierToAuction[_deedId];
// The auction must be active.
require(_activeAuction(auction));
// The auction can only be cancelled by the seller
require(msg.sender == auction.seller);
_cancelAuction(_deedId, auction);
}
/// @notice Bid on an auction.
/// @param _deedId The identifier of the deed to bid on.
function bid(uint256 _deedId) external payable whenNotPaused {
// Throws if the bid does not succeed.
_bid(msg.sender, msg.value, _deedId);
}
/// @dev Returns the current price of an auction.
/// @param _deedId The identifier of the deed to get the currency price for.
function getCurrentPrice(uint256 _deedId) external view returns (uint256) {
Auction storage auction = identifierToAuction[_deedId];
// The auction must be active.
require(_activeAuction(auction));
return _currentPrice(auction);
}
/// @notice Withdraw ether owed to a beneficiary.
/// @param beneficiary The address to withdraw the auction balance for.
function withdrawAuctionBalance(address beneficiary) external {
// The sender must either be the beneficiary or the core deed contract.
require(
msg.sender == beneficiary ||
msg.sender == address(deedContract)
);
uint256 etherOwed = addressToEtherOwed[beneficiary];
// Ensure ether is owed to the beneficiary.
require(etherOwed > 0);
// Set ether owed to 0
delete addressToEtherOwed[beneficiary];
// Subtract from total outstanding balance. etherOwed is guaranteed
// to be less than or equal to outstandingEther, so this cannot
// underflow.
outstandingEther -= etherOwed;
// Transfer ether owed to the beneficiary (not susceptible to re-entry
// attack, as the ether owed is set to 0 before the transfer takes place).
beneficiary.transfer(etherOwed);
}
/// @notice Withdraw (unowed) contract balance.
function withdrawFreeBalance() external {
// Calculate the free (unowed) balance. This never underflows, as
// outstandingEther is guaranteed to be less than or equal to the
// contract balance.
uint256 freeBalance = this.balance - outstandingEther;
address deedContractAddress = address(deedContract);
require(
msg.sender == owner ||
msg.sender == deedContractAddress
);
deedContractAddress.transfer(freeBalance);
}
}
/// @dev Defines base data structures for DWorld.
contract OriginalDWorldBase is DWorldAccessControl {
using SafeMath for uint256;
/// @dev All minted plots (array of plot identifiers). There are
/// 2^16 * 2^16 possible plots (covering the entire world), thus
/// 32 bits are required. This fits in a uint32. Storing
/// the identifiers as uint32 instead of uint256 makes storage
/// cheaper. (The impact of this in mappings is less noticeable,
/// and using uint32 in the mappings below actually *increases*
/// gas cost for minting).
uint32[] public plots;
mapping (uint256 => address) identifierToOwner;
mapping (uint256 => address) identifierToApproved;
mapping (address => uint256) ownershipDeedCount;
/// @dev Event fired when a plot's data are changed. The plot
/// data are not stored in the contract directly, instead the
/// data are logged to the block. This gives significant
/// reductions in gas requirements (~75k for minting with data
/// instead of ~180k). However, it also means plot data are
/// not available from *within* other contracts.
event SetData(uint256 indexed deedId, string name, string description, string imageUrl, string infoUrl);
/// @notice Get all minted plots.
function getAllPlots() external view returns(uint32[]) {
return plots;
}
/// @dev Represent a 2D coordinate as a single uint.
/// @param x The x-coordinate.
/// @param y The y-coordinate.
function coordinateToIdentifier(uint256 x, uint256 y) public pure returns(uint256) {
require(validCoordinate(x, y));
return (y << 16) + x;
}
/// @dev Turn a single uint representation of a coordinate into its x and y parts.
/// @param identifier The uint representation of a coordinate.
function identifierToCoordinate(uint256 identifier) public pure returns(uint256 x, uint256 y) {
require(validIdentifier(identifier));
y = identifier >> 16;
x = identifier - (y << 16);
}
/// @dev Test whether the coordinate is valid.
/// @param x The x-part of the coordinate to test.
/// @param y The y-part of the coordinate to test.
function validCoordinate(uint256 x, uint256 y) public pure returns(bool) {
return x < 65536 && y < 65536; // 2^16
}
/// @dev Test whether an identifier is valid.
/// @param identifier The identifier to test.
function validIdentifier(uint256 identifier) public pure returns(bool) {
return identifier < 4294967296; // 2^16 * 2^16
}
/// @dev Set a plot's data.
/// @param identifier The identifier of the plot to set data for.
function _setPlotData(uint256 identifier, string name, string description, string imageUrl, string infoUrl) internal {
SetData(identifier, name, description, imageUrl, infoUrl);
}
}
/// @dev Holds deed functionality such as approving and transferring. Implements ERC721.
contract OriginalDWorldDeed is OriginalDWorldBase, ERC721, ERC721Metadata {
/// @notice Name of the collection of deeds (non-fungible token), as defined in ERC721Metadata.
function name() public pure returns (string _deedName) {
_deedName = "DWorld Plots";
}
/// @notice Symbol of the collection of deeds (non-fungible token), as defined in ERC721Metadata.
function symbol() public pure returns (string _deedSymbol) {
_deedSymbol = "DWP";
}
/// @dev ERC-165 (draft) interface signature for itself
bytes4 internal constant INTERFACE_SIGNATURE_ERC165 = // 0x01ffc9a7
bytes4(keccak256('supportsInterface(bytes4)'));
/// @dev ERC-165 (draft) interface signature for ERC721
bytes4 internal constant INTERFACE_SIGNATURE_ERC721 = // 0xda671b9b
bytes4(keccak256('ownerOf(uint256)')) ^
bytes4(keccak256('countOfDeeds()')) ^
bytes4(keccak256('countOfDeedsByOwner(address)')) ^
bytes4(keccak256('deedOfOwnerByIndex(address,uint256)')) ^
bytes4(keccak256('approve(address,uint256)')) ^
bytes4(keccak256('takeOwnership(uint256)'));
/// @dev ERC-165 (draft) interface signature for ERC721
bytes4 internal constant INTERFACE_SIGNATURE_ERC721Metadata = // 0x2a786f11
bytes4(keccak256('name()')) ^
bytes4(keccak256('symbol()')) ^
bytes4(keccak256('deedUri(uint256)'));
/// @notice Introspection interface as per ERC-165 (https://github.com/ethereum/EIPs/issues/165).
/// Returns true for any standardized interfaces implemented by this contract.
/// (ERC-165 and ERC-721.)
function supportsInterface(bytes4 _interfaceID) external pure returns (bool) {
return (
(_interfaceID == INTERFACE_SIGNATURE_ERC165)
|| (_interfaceID == INTERFACE_SIGNATURE_ERC721)
|| (_interfaceID == INTERFACE_SIGNATURE_ERC721Metadata)
);
}
/// @dev Checks if a given address owns a particular plot.
/// @param _owner The address of the owner to check for.
/// @param _deedId The plot identifier to check for.
function _owns(address _owner, uint256 _deedId) internal view returns (bool) {
return identifierToOwner[_deedId] == _owner;
}
/// @dev Approve a given address to take ownership of a deed.
/// @param _from The address approving taking ownership.
/// @param _to The address to approve taking ownership.
/// @param _deedId The identifier of the deed to give approval for.
function _approve(address _from, address _to, uint256 _deedId) internal {
identifierToApproved[_deedId] = _to;
// Emit event.
Approval(_from, _to, _deedId);
}
/// @dev Checks if a given address has approval to take ownership of a deed.
/// @param _claimant The address of the claimant to check for.
/// @param _deedId The identifier of the deed to check for.
function _approvedFor(address _claimant, uint256 _deedId) internal view returns (bool) {
return identifierToApproved[_deedId] == _claimant;
}
/// @dev Assigns ownership of a specific deed to an address.
/// @param _from The address to transfer the deed from.
/// @param _to The address to transfer the deed to.
/// @param _deedId The identifier of the deed to transfer.
function _transfer(address _from, address _to, uint256 _deedId) internal {
// The number of plots is capped at 2^16 * 2^16, so this cannot
// be overflowed.
ownershipDeedCount[_to]++;
// Transfer ownership.
identifierToOwner[_deedId] = _to;
// When a new deed is minted, the _from address is 0x0, but we
// do not track deed ownership of 0x0.
if (_from != address(0)) {
ownershipDeedCount[_from]--;
// Clear taking ownership approval.
delete identifierToApproved[_deedId];
}
// Emit the transfer event.
Transfer(_from, _to, _deedId);
}
// ERC 721 implementation
/// @notice Returns the total number of deeds currently in existence.
/// @dev Required for ERC-721 compliance.
function countOfDeeds() public view returns (uint256) {
return plots.length;
}
/// @notice Returns the number of deeds owned by a specific address.
/// @param _owner The owner address to check.
/// @dev Required for ERC-721 compliance
function countOfDeedsByOwner(address _owner) public view returns (uint256) {
return ownershipDeedCount[_owner];
}
/// @notice Returns the address currently assigned ownership of a given deed.
/// @dev Required for ERC-721 compliance.
function ownerOf(uint256 _deedId) external view returns (address _owner) {
_owner = identifierToOwner[_deedId];
require(_owner != address(0));
}
/// @notice Approve a given address to take ownership of a deed.
/// @param _to The address to approve taking owernship.
/// @param _deedId The identifier of the deed to give approval for.
/// @dev Required for ERC-721 compliance.
function approve(address _to, uint256 _deedId) external whenNotPaused {
uint256[] memory _deedIds = new uint256[](1);
_deedIds[0] = _deedId;
approveMultiple(_to, _deedIds);
}
/// @notice Approve a given address to take ownership of multiple deeds.
/// @param _to The address to approve taking ownership.
/// @param _deedIds The identifiers of the deeds to give approval for.
function approveMultiple(address _to, uint256[] _deedIds) public whenNotPaused {
// Ensure the sender is not approving themselves.
require(msg.sender != _to);
for (uint256 i = 0; i < _deedIds.length; i++) {
uint256 _deedId = _deedIds[i];
// Require the sender is the owner of the deed.
require(_owns(msg.sender, _deedId));
// Perform the approval.
_approve(msg.sender, _to, _deedId);
}
}
/// @notice Transfer a deed to another address. If transferring to a smart
/// contract be VERY CAREFUL to ensure that it is aware of ERC-721, or your
/// deed may be lost forever.
/// @param _to The address of the recipient, can be a user or contract.
/// @param _deedId The identifier of the deed to transfer.
/// @dev Required for ERC-721 compliance.
function transfer(address _to, uint256 _deedId) external whenNotPaused {
uint256[] memory _deedIds = new uint256[](1);
_deedIds[0] = _deedId;
transferMultiple(_to, _deedIds);
}
/// @notice Transfers multiple deeds to another address. If transferring to
/// a smart contract be VERY CAREFUL to ensure that it is aware of ERC-721,
/// or your deeds may be lost forever.
/// @param _to The address of the recipient, can be a user or contract.
/// @param _deedIds The identifiers of the deeds to transfer.
function transferMultiple(address _to, uint256[] _deedIds) public whenNotPaused {
// Safety check to prevent against an unexpected 0x0 default.
require(_to != address(0));
// Disallow transfers to this contract to prevent accidental misuse.
require(_to != address(this));
for (uint256 i = 0; i < _deedIds.length; i++) {
uint256 _deedId = _deedIds[i];
// One can only transfer their own plots.
require(_owns(msg.sender, _deedId));
// Transfer ownership
_transfer(msg.sender, _to, _deedId);
}
}
/// @notice Transfer a deed owned by another address, for which the calling
/// address has previously been granted transfer approval by the owner.
/// @param _deedId The identifier of the deed to be transferred.
/// @dev Required for ERC-721 compliance.
function takeOwnership(uint256 _deedId) external whenNotPaused {
uint256[] memory _deedIds = new uint256[](1);
_deedIds[0] = _deedId;
takeOwnershipMultiple(_deedIds);
}
/// @notice Transfer multiple deeds owned by another address, for which the
/// calling address has previously been granted transfer approval by the owner.
/// @param _deedIds The identifier of the deed to be transferred.
function takeOwnershipMultiple(uint256[] _deedIds) public whenNotPaused {
for (uint256 i = 0; i < _deedIds.length; i++) {
uint256 _deedId = _deedIds[i];
address _from = identifierToOwner[_deedId];
// Check for transfer approval
require(_approvedFor(msg.sender, _deedId));
// Reassign ownership (also clears pending approvals and emits Transfer event).
_transfer(_from, msg.sender, _deedId);
}
}
/// @notice Returns a list of all deed identifiers assigned to an address.
/// @param _owner The owner whose deeds we are interested in.
/// @dev This method MUST NEVER be called by smart contract code. It's very
/// expensive and is not supported in contract-to-contract calls as it returns
/// a dynamic array (only supported for web3 calls).
function deedsOfOwner(address _owner) external view returns(uint256[]) {
uint256 deedCount = countOfDeedsByOwner(_owner);
if (deedCount == 0) {
// Return an empty array.
return new uint256[](0);
} else {
uint256[] memory result = new uint256[](deedCount);
uint256 totalDeeds = countOfDeeds();
uint256 resultIndex = 0;
for (uint256 deedNumber = 0; deedNumber < totalDeeds; deedNumber++) {
uint256 identifier = plots[deedNumber];
if (identifierToOwner[identifier] == _owner) {
result[resultIndex] = identifier;
resultIndex++;
}
}
return result;
}
}
/// @notice Returns a deed identifier of the owner at the given index.
/// @param _owner The address of the owner we want to get a deed for.
/// @param _index The index of the deed we want.
function deedOfOwnerByIndex(address _owner, uint256 _index) external view returns (uint256) {
// The index should be valid.
require(_index < countOfDeedsByOwner(_owner));
// Loop through all plots, accounting the number of plots of the owner we've seen.
uint256 seen = 0;
uint256 totalDeeds = countOfDeeds();
for (uint256 deedNumber = 0; deedNumber < totalDeeds; deedNumber++) {
uint256 identifier = plots[deedNumber];
if (identifierToOwner[identifier] == _owner) {
if (seen == _index) {
return identifier;
}
seen++;
}
}
}
/// @notice Returns an (off-chain) metadata url for the given deed.
/// @param _deedId The identifier of the deed to get the metadata
/// url for.
/// @dev Implementation of optional ERC-721 functionality.
function deedUri(uint256 _deedId) external pure returns (string uri) {
require(validIdentifier(_deedId));
var (x, y) = identifierToCoordinate(_deedId);
// Maximum coordinate length in decimals is 5 (65535)
uri = "https://dworld.io/plot/xxxxx/xxxxx";
bytes memory _uri = bytes(uri);
for (uint256 i = 0; i < 5; i++) {
_uri[27 - i] = byte(48 + (x / 10 ** i) % 10);
_uri[33 - i] = byte(48 + (y / 10 ** i) % 10);
}
}
}
/// @dev Migrate original data from the old contract.
contract DWorldUpgrade is DWorldMinting {
OriginalDWorldDeed originalContract;
ClockAuction originalSaleAuction;
ClockAuction originalRentAuction;
/// @notice Keep track of whether we have finished migrating.
bool public migrationFinished = false;
/// @dev Keep track of how many plots have been transferred so far.
uint256 migrationNumPlotsTransferred = 0;
function DWorldUpgrade(
address originalContractAddress,
address originalSaleAuctionAddress,
address originalRentAuctionAddress
)
public
{
if (originalContractAddress != 0) {
_startMigration(originalContractAddress, originalSaleAuctionAddress, originalRentAuctionAddress);
} else {
migrationFinished = true;
}
}
/// @dev Migrate data from the original contract. Assumes the original
/// contract is paused, and remains paused for the duration of the
/// migration.
/// @param originalContractAddress The address of the original contract.
function _startMigration(
address originalContractAddress,
address originalSaleAuctionAddress,
address originalRentAuctionAddress
)
internal
{
// Set contracts.
originalContract = OriginalDWorldDeed(originalContractAddress);
originalSaleAuction = ClockAuction(originalSaleAuctionAddress);
originalRentAuction = ClockAuction(originalRentAuctionAddress);
// Start paused.
paused = true;
// Get count of original plots.
uint256 numPlots = originalContract.countOfDeeds();
// Allocate storage for the plots array (this is more
// efficient than .push-ing each individual plot, as
// that requires multiple dynamic allocations).
plots.length = numPlots;
}
function migrationStep(uint256 numPlotsTransfer) external onlyOwner whenPaused {
// Migration must not be finished yet.
require(!migrationFinished);
// Get count of original plots.
uint256 numPlots = originalContract.countOfDeeds();
// Loop through plots and assign to original owner.
uint256 i;
for (i = migrationNumPlotsTransferred; i < numPlots && i < migrationNumPlotsTransferred + numPlotsTransfer; i++) {
uint32 _deedId = originalContract.plots(i);
// Set plot.
plots[i] = _deedId;
// Get the original owner and transfer.
address owner = originalContract.ownerOf(_deedId);
// If the owner of the plot is an auction contract,
// get the actual owner of the plot.
address seller;
if (owner == address(originalSaleAuction)) {
(seller, ) = originalSaleAuction.getAuction(_deedId);
owner = seller;
} else if (owner == address(originalRentAuction)) {
(seller, ) = originalRentAuction.getAuction(_deedId);
owner = seller;
}
_transfer(address(0), owner, _deedId);
// Set the initial price paid for the plot.
initialPricePaid[_deedId] = 0.0125 ether;
// The initial buyout price.
uint256 _initialBuyoutPrice = 0.050 ether;
// Set the initial buyout price.
identifierToBuyoutPrice[_deedId] = _initialBuyoutPrice;
// Trigger the buyout price event.
SetBuyoutPrice(_deedId, _initialBuyoutPrice);
// Mark the plot as being an original.
identifierIsOriginal[_deedId] = true;
}
migrationNumPlotsTransferred += numPlotsTransfer;
// Finished migration.
if (i == numPlots) {
migrationFinished = true;
}
}
}
/// @dev Implements highest-level DWorld functionality.
contract DWorldCore is DWorldUpgrade {
/// If this contract is broken, this will be used to publish the address at which an upgraded contract can be found
address public upgradedContractAddress;
event ContractUpgrade(address upgradedContractAddress);
function DWorldCore(
address originalContractAddress,
address originalSaleAuctionAddress,
address originalRentAuctionAddress,
uint256 buyoutsEnabledAfterHours
)
DWorldUpgrade(originalContractAddress, originalSaleAuctionAddress, originalRentAuctionAddress)
public
{
buyoutsEnabledFromTimestamp = block.timestamp + buyoutsEnabledAfterHours * 3600;
}
/// @notice Only to be used when this contract is significantly broken,
/// and an upgrade is required.
function setUpgradedContractAddress(address _upgradedContractAddress) external onlyOwner whenPaused {
upgradedContractAddress = _upgradedContractAddress;
ContractUpgrade(_upgradedContractAddress);
}
/// @notice Set the data associated with a plot.
function setPlotData(uint256 _deedId, string name, string description, string imageUrl, string infoUrl)
public
whenNotPaused
{
// The sender requesting the data update should be
// the owner.
require(_owns(msg.sender, _deedId));
// Set the data
_setPlotData(_deedId, name, description, imageUrl, infoUrl);
}
/// @notice Set the data associated with multiple plots.
function setPlotDataMultiple(uint256[] _deedIds, string name, string description, string imageUrl, string infoUrl)
external
whenNotPaused
{
for (uint256 i = 0; i < _deedIds.length; i++) {
uint256 _deedId = _deedIds[i];
setPlotData(_deedId, name, description, imageUrl, infoUrl);
}
}
/// @notice Withdraw Ether owed to the sender.
function withdrawBalance() external {
uint256 etherOwed = addressToEtherOwed[msg.sender];
// Ensure Ether is owed to the sender.
require(etherOwed > 0);
// Set Ether owed to 0.
delete addressToEtherOwed[msg.sender];
// Subtract from total outstanding balance. etherOwed is guaranteed
// to be less than or equal to outstandingEther, so this cannot
// underflow.
outstandingEther -= etherOwed;
// Transfer Ether owed to the sender (not susceptible to re-entry
// attack, as the Ether owed is set to 0 before the transfer takes place).
msg.sender.transfer(etherOwed);
}
/// @notice Withdraw (unowed) contract balance.
function withdrawFreeBalance() external onlyCFO {
// Calculate the free (unowed) balance. This never underflows, as
// outstandingEther is guaranteed to be less than or equal to the
// contract balance.
uint256 freeBalance = this.balance - outstandingEther;
cfoAddress.transfer(freeBalance);
}
}Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000d4df33983ff82ce4469c6ea3cff390403e58d90a000000000000000000000000621ad3562f5141c4a0e7cad958b8b524d356332b0000000000000000000000005301f1ec2f48f86bbd5291dfd7998a3d733a3245000000000000000000000000000000000000000000000000000000000000000f
-----Decoded View---------------
Arg [0] : originalContractAddress (address): 0xd4Df33983FF82CE4469c6ea3CFf390403E58d90A
Arg [1] : originalSaleAuctionAddress (address): 0x621aD3562F5141c4A0E7Cad958b8b524d356332B
Arg [2] : originalRentAuctionAddress (address): 0x5301F1EC2F48F86bbd5291DfD7998a3d733A3245
Arg [3] : buyoutsEnabledAfterHours (uint256): 15
-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000d4df33983ff82ce4469c6ea3cff390403e58d90a
Arg [1] : 000000000000000000000000621ad3562f5141c4a0e7cad958b8b524d356332b
Arg [2] : 0000000000000000000000005301f1ec2f48f86bbd5291dfd7998a3d733a3245
Arg [3] : 000000000000000000000000000000000000000000000000000000000000000f
Swarm Source
bzzr://bc2d6a40b8c993c2bf29b30e2c63ee3c95740cec38ec2a94734649f1063a9e91
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