Overview
Max Total Supply
26,228,711 TZROP
Holders
235 (0.00%)
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 |
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Contract Name:
T0ken
Compiler Version
v0.5.2+commit.1df8f40c
Optimization Enabled:
Yes with 1000 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2019-01-01 */ /** * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ pragma solidity ^0.5.2; /** * @title Ownable * @dev Provides a modifier that requires the caller to be the owner of the contract. */ contract Ownable { address payable public owner; event OwnerTransferred( address indexed oldOwner, address indexed newOwner ); constructor() public { owner = msg.sender; } modifier onlyOwner() { require(msg.sender == owner, "Owner account is required"); _; } /** * @dev Allows the current owner to transfer control of the contract to newOwner. * @param newOwner The address to transfer ownership to. */ function transferOwner(address payable newOwner) public onlyOwner { require(newOwner != owner, "New Owner cannot be the current owner"); require(newOwner != address(0), "New Owner cannot be zero address"); address payable prevOwner = owner; owner = newOwner; emit OwnerTransferred(prevOwner, newOwner); } } /** * @title Lockable * @dev The Lockable contract adds the ability for the contract owner to set the lock status * of the account. A modifier is provided that checks the throws when the contract is * in the locked state. */ contract Lockable is Ownable { bool public isLocked; constructor() public { isLocked = false; } modifier isUnlocked() { require(!isLocked, "Contract is currently locked for modification"); _; } /** * Set the contract to a read-only state. * @param locked The locked state to set the contract to. */ function setLocked(bool locked) onlyOwner external { require(isLocked != locked, "Contract already in requested lock state"); isLocked = locked; } } /** * @title Destroyable * @dev The Destroyable contract alows the owner address to `selfdestruct` the contract. */ contract Destroyable is Ownable { /** * Allow the owner to destroy this contract. */ function kill() onlyOwner external { selfdestruct(owner); } } /** * Contract to facilitate locking and self destructing. */ contract LockableDestroyable is Lockable, Destroyable { } library AdditiveMath { /** * Adds two numbers and returns the result * THROWS when the result overflows * @return The sum of the arguments */ function add(uint256 x, uint256 y) internal pure returns (uint256) { uint256 sum = x + y; require(sum >= x, "Results in overflow"); return sum; } /** * Subtracts two numbers and returns the result * THROWS when the result underflows * @return The difference of the arguments */ function subtract(uint256 x, uint256 y) internal pure returns (uint256) { require(y <= x, "Results in underflow"); return x - y; } } /** * * @title AddressMap * @dev Map of unique indexed addresseses. * * **NOTE** * The internal collections are one-based. * This is simply because null values are expressed as zero, * which makes it hard to check for the existence of items within the array, * or grabbing the first item of an array for non-existent items. * * This is only exposed internally, so callers still use zero-based indices. * */ library AddressMap { struct Data { int256 count; mapping(address => int256) indices; mapping(int256 => address) items; } address constant ZERO_ADDRESS = address(0); /** * Appends the address to the end of the map, if the address is not * zero and the address doesn't currently exist. * @param addr The address to append. * @return true if the address was added. */ function append(Data storage self, address addr) internal returns (bool) { if (addr == ZERO_ADDRESS) { return false; } int256 index = self.indices[addr] - 1; if (index >= 0 && index < self.count) { return false; } self.count++; self.indices[addr] = self.count; self.items[self.count] = addr; return true; } /** * Removes the given address from the map. * @param addr The address to remove from the map. * @return true if the address was removed. */ function remove(Data storage self, address addr) internal returns (bool) { int256 oneBasedIndex = self.indices[addr]; if (oneBasedIndex < 1 || oneBasedIndex > self.count) { return false; // address doesn't exist, or zero. } // When the item being removed is not the last item in the collection, // replace that item with the last one, otherwise zero it out. // // If {2} is the item to be removed // [0, 1, 2, 3, 4] // The result would be: // [0, 1, 4, 3] // if (oneBasedIndex < self.count) { // Replace with last item address last = self.items[self.count]; // Get the last item self.indices[last] = oneBasedIndex; // Update last items index to current index self.items[oneBasedIndex] = last; // Update current index to last item delete self.items[self.count]; // Delete the last item, since it's moved } else { // Delete the address delete self.items[oneBasedIndex]; } delete self.indices[addr]; self.count--; return true; } /** * Clears all items within the map. */ function clear(Data storage self) internal { self.count = 0; } /** * Retrieves the address at the given index. * THROWS when the index is invalid. * @param index The index of the item to retrieve. * @return The address of the item at the given index. */ function at(Data storage self, int256 index) internal view returns (address) { require(index >= 0 && index < self.count, "Index outside of bounds."); return self.items[index + 1]; } /** * Gets the index of the given address. * @param addr The address of the item to get the index for. * @return The index of the given address. */ function indexOf(Data storage self, address addr) internal view returns (int256) { if (addr == ZERO_ADDRESS) { return -1; } int256 index = self.indices[addr] - 1; if (index < 0 || index >= self.count) { return -1; } return index; } /** * Returns whether or not the given address exists within the map. * @param addr The address to check for existence. * @return If the given address exists or not. */ function exists(Data storage self, address addr) internal view returns (bool) { int256 index = self.indices[addr] - 1; return index >= 0 && index < self.count; } } /** * * @title AccountMap * @dev Map of unique indexed accounts. * * **NOTE** * The internal collections are one-based. * This is simply because null values are expressed as zero, * which makes it hard to check for the existence of items within the array, * or grabbing the first item of an array for non-existent items. * * This is only exposed internally, so callers still use zero-based indices. * */ library AccountMap { struct Account { address addr; uint8 kind; bool frozen; address parent; } struct Data { int256 count; mapping(address => int256) indices; mapping(int256 => Account) items; } address constant ZERO_ADDRESS = address(0); /** * Appends the address to the end of the map, if the addres is not * zero and the address doesn't currently exist. * @param addr The address to append. * @return true if the address was added. */ function append(Data storage self, address addr, uint8 kind, bool isFrozen, address parent) internal returns (bool) { if (addr == ZERO_ADDRESS) { return false; } int256 index = self.indices[addr] - 1; if (index >= 0 && index < self.count) { return false; } self.count++; self.indices[addr] = self.count; self.items[self.count] = Account(addr, kind, isFrozen, parent); return true; } /** * Removes the given address from the map. * @param addr The address to remove from the map. * @return true if the address was removed. */ function remove(Data storage self, address addr) internal returns (bool) { int256 oneBasedIndex = self.indices[addr]; if (oneBasedIndex < 1 || oneBasedIndex > self.count) { return false; // address doesn't exist, or zero. } // When the item being removed is not the last item in the collection, // replace that item with the last one, otherwise zero it out. // // If {2} is the item to be removed // [0, 1, 2, 3, 4] // The result would be: // [0, 1, 4, 3] // if (oneBasedIndex < self.count) { // Replace with last item Account storage last = self.items[self.count]; // Get the last item self.indices[last.addr] = oneBasedIndex; // Update last items index to current index self.items[oneBasedIndex] = last; // Update current index to last item delete self.items[self.count]; // Delete the last item, since it's moved } else { // Delete the account delete self.items[oneBasedIndex]; } delete self.indices[addr]; self.count--; return true; } /** * Clears all items within the map. */ function clear(Data storage self) internal { self.count = 0; } /** * Retrieves the address at the given index. * THROWS when the index is invalid. * @param index The index of the item to retrieve. * @return The address of the item at the given index. */ function at(Data storage self, int256 index) internal view returns (Account memory) { require(index >= 0 && index < self.count, "Index outside of bounds."); return self.items[index + 1]; } /** * Gets the index of the given address. * @param addr The address of the item to get the index for. * @return The index of the given address. */ function indexOf(Data storage self, address addr) internal view returns (int256) { if (addr == ZERO_ADDRESS) { return -1; } int256 index = self.indices[addr] - 1; if (index < 0 || index >= self.count) { return -1; } return index; } /** * Gets the Account for the given address. * THROWS when an account doesn't exist for the given address. * @param addr The address of the item to get. * @return The account of the given address. */ function get(Data storage self, address addr) internal view returns (Account memory) { return at(self, indexOf(self, addr)); } /** * Returns whether or not the given address exists within the map. * @param addr The address to check for existence. * @return If the given address exists or not. */ function exists(Data storage self, address addr) internal view returns (bool) { int256 index = self.indices[addr] - 1; return index >= 0 && index < self.count; } } /** * @title Registry Storage */ contract Storage is Ownable, LockableDestroyable { using AccountMap for AccountMap.Data; using AddressMap for AddressMap.Data; // ------------------------------- Variables ------------------------------- // Number of data slots available for accounts uint8 constant MAX_DATA = 30; // Accounts AccountMap.Data public accounts; // Account Data // - mapping of: // (address => (index => data)) mapping(address => mapping(uint8 => bytes32)) public data; // Address write permissions // (kind => address) mapping(uint8 => AddressMap.Data) public permissions; // ------------------------------- Modifiers ------------------------------- /** * Ensures the `msg.sender` has permission for the given kind/type of account. * * - The `owner` account is always allowed * - Addresses/Contracts must have a corresponding entry, for the given kind */ modifier isAllowed(uint8 kind) { require(kind > 0, "Invalid, or missing permission"); if (msg.sender != owner) { require(permissions[kind].exists(msg.sender), "Missing permission"); } _; } // ------------------------------------------------------------------------- /** * Adds an account to storage * THROWS when `msg.sender` doesn't have permission * THROWS when the account already exists * @param addr The address of the account * @param kind The kind of account * @param isFrozen The frozen status of the account * @param parent The account parent/owner */ function addAccount(address addr, uint8 kind, bool isFrozen, address parent) isUnlocked isAllowed(kind) external { require(accounts.append(addr, kind, isFrozen, parent), "Account already exists"); } /** * Sets an account's frozen status * THROWS when the account doesn't exist * @param addr The address of the account * @param frozen The frozen status of the account */ function setAccountFrozen(address addr, bool frozen) isUnlocked isAllowed(accounts.get(addr).kind) external { // NOTE: Not bounds checking `index` here, as `isAllowed` ensures the address exists. // Indices are one-based internally, so we need to add one to compensate. int256 index = accounts.indexOf(addr) + 1; accounts.items[index].frozen = frozen; } /** * Removes an account from storage * THROWS when the account doesn't exist * @param addr The address of the account */ function removeAccount(address addr) isUnlocked isAllowed(accounts.get(addr).kind) external { bytes32 ZERO_BYTES = bytes32(0); mapping(uint8 => bytes32) storage accountData = data[addr]; // Remove data for (uint8 i = 0; i < MAX_DATA; i++) { if (accountData[i] != ZERO_BYTES) { delete accountData[i]; } } // Remove account accounts.remove(addr); } /** * Sets data for an address/caller * THROWS when the account doesn't exist * @param addr The address * @param index The index of the data * @param customData The data store set */ function setAccountData(address addr, uint8 index, bytes32 customData) isUnlocked isAllowed(accounts.get(addr).kind) external { require(index < MAX_DATA, "index outside of bounds"); data[addr][index] = customData; } /** * Grants the address permission for the given kind * @param kind The kind of address * @param addr The address */ function grantPermission(uint8 kind, address addr) isUnlocked isAllowed(kind) external { permissions[kind].append(addr); } /** * Revokes the address permission for the given kind * @param kind The kind of address * @param addr The address */ function revokePermission(uint8 kind, address addr) isUnlocked isAllowed(kind) external { permissions[kind].remove(addr); } // ---------------------------- Address Getters ---------------------------- /** * Gets the account at the given index * THROWS when the index is out-of-bounds * @param index The index of the item to retrieve * @return The address, kind, frozen status, and parent of the account at the given index */ function accountAt(int256 index) external view returns(address, uint8, bool, address) { AccountMap.Account memory acct = accounts.at(index); return (acct.addr, acct.kind, acct.frozen, acct.parent); } /** * Gets the account for the given address * THROWS when the account doesn't exist * @param addr The address of the item to retrieve * @return The address, kind, frozen status, and parent of the account at the given index */ function accountGet(address addr) external view returns(uint8, bool, address) { AccountMap.Account memory acct = accounts.get(addr); return (acct.kind, acct.frozen, acct.parent); } /** * Gets the parent address for the given account address * THROWS when the account doesn't exist * @param addr The address of the account * @return The parent address */ function accountParent(address addr) external view returns(address) { return accounts.get(addr).parent; } /** * Gets the account kind, for the given account address * THROWS when the account doesn't exist * @param addr The address of the account * @return The kind of account */ function accountKind(address addr) external view returns(uint8) { return accounts.get(addr).kind; } /** * Gets the frozen status of the account * THROWS when the account doesn't exist * @param addr The address of the account * @return The frozen status of the account */ function accountFrozen(address addr) external view returns(bool) { return accounts.get(addr).frozen; } /** * Gets the index of the account * Returns -1 for missing accounts * @param addr The address of the account to get the index for * @return The index of the given account address */ function accountIndexOf(address addr) external view returns(int256) { return accounts.indexOf(addr); } /** * Returns wether or not the given address exists * @param addr The account address * @return If the given address exists */ function accountExists(address addr) external view returns(bool) { return accounts.exists(addr); } /** * Returns wether or not the given address exists for the given kind * @param addr The account address * @param kind The kind of address * @return If the given address exists with the given kind */ function accountExists(address addr, uint8 kind) external view returns(bool) { int256 index = accounts.indexOf(addr); if (index < 0) { return false; } return accounts.at(index).kind == kind; } // -------------------------- Permission Getters --------------------------- /** * Retrieves the permission address at the index for the given type * THROWS when the index is out-of-bounds * @param kind The kind of permission * @param index The index of the item to retrieve * @return The permission address of the item at the given index */ function permissionAt(uint8 kind, int256 index) external view returns(address) { return permissions[kind].at(index); } /** * Gets the index of the permission address for the given type * Returns -1 for missing permission * @param kind The kind of perission * @param addr The address of the permission to get the index for * @return The index of the given permission address */ function permissionIndexOf(uint8 kind, address addr) external view returns(int256) { return permissions[kind].indexOf(addr); } /** * Returns wether or not the given permission address exists for the given type * @param kind The kind of permission * @param addr The address to check for permission * @return If the given address has permission or not */ function permissionExists(uint8 kind, address addr) external view returns(bool) { return permissions[kind].exists(addr); } } interface ComplianceRule { /** * @dev Checks if a transfer can occur between the from/to addresses and MUST throw when the check fails. * @param initiator The address initiating the transfer. * @param from The address of the sender * @param to The address of the receiver * @param toKind The kind of the to address * @param tokens The number of tokens being transferred. * @param store The Storage contract */ function check(address initiator, address from, address to, uint8 toKind, uint256 tokens, Storage store) external; } interface Compliance { /** * This event is emitted when an address's frozen status has changed. * @param addr The address whose frozen status has been updated. * @param isFrozen Whether the custodian is being frozen. * @param owner The address that updated the frozen status. */ event AddressFrozen( address indexed addr, bool indexed isFrozen, address indexed owner ); /** * Sets an address frozen status for this token * @param addr The address to update frozen status. * @param freeze Frozen status of the address. */ function setFrozen(address addr, bool freeze) external; /** * Replaces all of the existing rules with the given ones * @param kind The bucket of rules to set. * @param rules New compliance rules. */ function setRules(uint8 kind, ComplianceRule[] calldata rules) external; /** * Returns all of the current compliance rules for this token * @param kind The bucket of rules to get. * @return List of all compliance rules. */ function getRules(uint8 kind) external view returns (ComplianceRule[] memory); /** * @dev Checks if issuance can occur between the from/to addresses. * * Both addresses must be whitelisted and unfrozen * THROWS when the transfer should fail. * @param issuer The address initiating the issuance. * @param from The address of the sender. * @param to The address of the receiver. * @param tokens The number of tokens being transferred. * @return If a issuance can occur between the from/to addresses. */ function canIssue(address issuer, address from, address to, uint256 tokens) external returns (bool); /** * @dev Checks if a transfer can occur between the from/to addresses. * * Both addresses must be whitelisted, unfrozen, and pass all compliance rule checks. * THROWS when the transfer should fail. * @param initiator The address initiating the transfer. * @param from The address of the sender. * @param to The address of the receiver. * @param tokens The number of tokens being transferred. * @return If a transfer can occur between the from/to addresses. */ function canTransfer(address initiator, address from, address to, uint256 tokens) external returns (bool); /** * @dev Checks if an override by the sender can occur between the from/to addresses. * * Both addresses must be whitelisted and unfrozen. * THROWS when the sender is not allowed to override. * @param admin The address initiating the transfer. * @param from The address of the sender. * @param to The address of the receiver. * @param tokens The number of tokens being transferred. * @return If an override can occur between the from/to addresses. */ function canOverride(address admin, address from, address to, uint256 tokens) external returns (bool); } interface ERC20 { event Approval(address indexed owner, address indexed spender, uint256 value); event Transfer(address indexed from, address indexed to, uint256 value); function allowance(address owner, address spender) external view returns (uint256); function approve(address spender, uint256 value) external returns (bool); function balanceOf(address who) external view returns (uint256); function totalSupply() external view returns (uint256); function transfer(address to, uint256 value) external returns (bool); function transferFrom(address from, address to, uint256 value) external returns (bool); } contract T0ken is ERC20, Ownable, LockableDestroyable { // ------------------------------- Variables ------------------------------- using AdditiveMath for uint256; using AddressMap for AddressMap.Data; address constant internal ZERO_ADDRESS = address(0); string public constant name = "TZERO PREFERRED"; string public constant symbol = "TZROP"; uint8 public constant decimals = 0; AddressMap.Data public shareholders; Compliance public compliance; address public issuer; bool public issuingFinished = false; mapping(address => address) public cancellations; mapping(address => uint256) internal balances; uint256 internal totalSupplyTokens; mapping (address => mapping (address => uint256)) private allowed; // ------------------------------- Modifiers ------------------------------- modifier onlyIssuer() { require(msg.sender == issuer, "Only issuer allowed"); _; } modifier canIssue() { require(!issuingFinished, "Issuing is already finished"); _; } modifier isNotCancelled(address addr) { require(cancellations[addr] == ZERO_ADDRESS, "Address has been cancelled"); _; } modifier hasFunds(address addr, uint256 tokens) { require(tokens <= balances[addr], "Insufficient funds"); _; } // -------------------------------- Events --------------------------------- /** * This event is emitted when an address is cancelled and replaced with * a new address. This happens in the case where a shareholder has * lost access to their original address and needs to have their share * reissued to a new address. This is the equivalent of issuing replacement * share certificates. * @param original The address being superseded. * @param replacement The new address. * @param sender The address that caused the address to be superseded. */ event VerifiedAddressSuperseded(address indexed original, address indexed replacement, address indexed sender); event IssuerSet(address indexed previousIssuer, address indexed newIssuer); event Issue(address indexed to, uint256 tokens); event IssueFinished(); event ShareholderAdded(address shareholder); event ShareholderRemoved(address shareholder); // ------------------------------------------------------------------------- /** * @dev Transfers tokens to the whitelisted account. * * If the 'to' address is not currently a shareholder then it MUST become one. * If the transfer will reduce 'msg.sender' balance to 0, then that address MUST be removed * from the list of shareholders. * MUST be removed from the list of shareholders. * @param to The address to transfer to. * @param tokens The number of tokens to be transferred. */ function transfer(address to, uint256 tokens) external isUnlocked isNotCancelled(to) hasFunds(msg.sender, tokens) returns (bool) { bool transferAllowed; // Issuance if (msg.sender == issuer) { transferAllowed = address(compliance) == ZERO_ADDRESS; if (!transferAllowed) { transferAllowed = compliance.canIssue(issuer, issuer, to, tokens); } } // Transfer else { transferAllowed = canTransfer(msg.sender, to, tokens, false); } // Ensure the transfer is allowed. if (transferAllowed) { transferTokens(msg.sender, to, tokens); } return transferAllowed; } /** * @dev Transfers tokens between whitelisted accounts. * * If the 'to' address is not currently a shareholder then it MUST become one. * If the transfer will reduce 'from' balance to 0 then that address MUST be removed from the list of shareholders. * @param from The address to transfer from * @param to The address to transfer to. * @param tokens uint256 the number of tokens to be transferred */ function transferFrom(address from, address to, uint256 tokens) external isUnlocked isNotCancelled(to) hasFunds(from, tokens) returns (bool) { require(tokens <= allowed[from][msg.sender], "Transfer exceeds allowance"); // Transfer the tokens bool transferAllowed = canTransfer(from, to, tokens, false); if (transferAllowed) { // Update the allowance to reflect the transfer allowed[from][msg.sender] = allowed[from][msg.sender].subtract(tokens); // Transfer the tokens transferTokens(from, to, tokens); } return transferAllowed; } /** * @dev Overrides a transfer of tokens to the whitelisted account. * * If the 'to' address is not currently a shareholder then it MUST become one. * If the transfer will reduce 'msg.sender' balance to 0, then that address MUST be removed * from the list of shareholders. * MUST be removed from the list of shareholders. * @param from The address to transfer from * @param to The address to transfer to. * @param tokens The number of tokens to be transferred. */ function transferOverride(address from, address to, uint256 tokens) external isUnlocked isNotCancelled(to) hasFunds(from, tokens) returns (bool) { // Ensure the sender can perform the override. bool transferAllowed = canTransfer(from, to, tokens, true); // Ensure the transfer is allowed. if (transferAllowed) { transferTokens(from, to, tokens); } return transferAllowed; } /** * @dev Tokens will be issued to the issuer's address only. * @param quantity The number of tokens to mint. * @return A boolean that indicates if the operation was successful. */ function issueTokens(uint256 quantity) external isUnlocked onlyIssuer canIssue returns (bool) { // Avoid doing any state changes for zero quantities if (quantity > 0) { totalSupplyTokens = totalSupplyTokens.add(quantity); balances[issuer] = balances[issuer].add(quantity); shareholders.append(issuer); } emit Issue(issuer, quantity); emit Transfer(ZERO_ADDRESS, issuer, quantity); return true; } /** * @dev Finishes token issuance. * This is a single use function, once invoked it cannot be undone. */ function finishIssuing() external isUnlocked onlyIssuer canIssue returns (bool) { issuingFinished = true; emit IssueFinished(); return issuingFinished; } /** * @dev Cancel the original address and reissue the Tokens to the replacement address. * * Access to this function is restricted to the Issuer only. * The 'original' address MUST be removed from the set of whitelisted addresses. * Throw if the 'original' address supplied is not a shareholder. * Throw if the 'replacement' address is not a whitelisted address. * This function MUST emit the 'VerifiedAddressSuperseded' event. * @param original The address to be superseded. This address MUST NOT be reused and must be whitelisted. * @param replacement The address that supersedes the original. This address MUST be whitelisted. */ function cancelAndReissue(address original, address replacement) external isUnlocked onlyIssuer isNotCancelled(replacement) { // Ensure the reissue can take place require(shareholders.exists(original) && !shareholders.exists(replacement), "Original doesn't exist or replacement does"); if (address(compliance) != ZERO_ADDRESS) { require(compliance.canIssue(msg.sender, original, replacement, balances[original]), "Failed 'canIssue' check."); } // Replace the original shareholder with the replacement shareholders.remove(original); shareholders.append(replacement); // Add the original as a cancelled address (preventing it from future trading) cancellations[original] = replacement; // Transfer the balance to the replacement balances[replacement] = balances[original]; balances[original] = 0; emit VerifiedAddressSuperseded(original, replacement, msg.sender); } /** * @dev Approve the passed address to spend the specified number of tokens on behalf of msg.sender. * * 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 * @param spender The address which will spend the funds. * @param tokens The number of tokens of tokens to be spent. */ function approve(address spender, uint256 tokens) external isUnlocked isNotCancelled(msg.sender) returns (bool) { require(shareholders.exists(msg.sender), "Must be a shareholder to approve token transfer"); allowed[msg.sender][spender] = tokens; emit Approval(msg.sender, spender, tokens); return true; } /** * @dev Set the issuer address. * @param newIssuer The address of the issuer. */ function setIssuer(address newIssuer) external isUnlocked onlyOwner { issuer = newIssuer; emit IssuerSet(issuer, newIssuer); } /** * @dev Sets the compliance contract address to use during transfers. * @param newComplianceAddress The address of the compliance contract. */ function setCompliance(address newComplianceAddress) external isUnlocked onlyOwner { compliance = Compliance(newComplianceAddress); } // -------------------------------- Getters -------------------------------- /** * @dev Returns the total token supply * @return total number of tokens in existence */ function totalSupply() external view returns (uint256) { return totalSupplyTokens; } /** * @dev Gets the balance of the specified address. * @param addr The address to query the the balance of. * @return An uint256 representing the tokens owned by the passed address. */ function balanceOf(address addr) external view returns (uint256) { return balances[addr]; } /** * @dev Gets the number of tokens that an owner has allowed the spender to transfer. * @param addrOwner address The address which owns the funds. * @param spender address The address which will spend the funds. * @return A uint256 specifying the number of tokens still available for the spender. */ function allowance(address addrOwner, address spender) external view returns (uint256) { return allowed[addrOwner][spender]; } /** * By counting the number of token holders using 'holderCount' * you can retrieve the complete list of token holders, one at a time. * It MUST throw if 'index >= holderCount()'. * @dev Returns the holder at the given index. * @param index The zero-based index of the holder. * @return the address of the token holder with the given index. */ function holderAt(int256 index) external view returns (address){ return shareholders.at(index); } /** * @dev Checks to see if the supplied address is a share holder. * @param addr The address to check. * @return true if the supplied address owns a token. */ function isHolder(address addr) external view returns (bool) { return shareholders.exists(addr); } /** * @dev Checks to see if the supplied address was superseded. * @param addr The address to check. * @return true if the supplied address was superseded by another address. */ function isSuperseded(address addr) external view returns (bool) { return cancellations[addr] != ZERO_ADDRESS; } /** * Gets the most recent address, given a superseded one. * Addresses may be superseded multiple times, so this function needs to * follow the chain of addresses until it reaches the final, verified address. * @param addr The superseded address. * @return the verified address that ultimately holds the share. */ function getSuperseded(address addr) external view returns (address) { require(addr != ZERO_ADDRESS, "Non-zero address required"); address candidate = cancellations[addr]; if (candidate == ZERO_ADDRESS) { return ZERO_ADDRESS; } return candidate; } // -------------------------------- Private -------------------------------- /** * @dev Checks if a transfer/override may take place between the two accounts. * * Validates that the transfer can take place. * - Ensure the 'to' address is not cancelled * - Ensure the transfer is compliant * @param from The sender address. * @param to The recipient address. * @param tokens The number of tokens being transferred. * @param isOverride If this is a transfer override * @return If the transfer can take place. */ function canTransfer(address from, address to, uint256 tokens, bool isOverride) private isNotCancelled(to) returns (bool) { // Don't allow overrides and ignore compliance rules when compliance not set. if (address(compliance) == ZERO_ADDRESS) { return !isOverride; } // Ensure the override is valid, or that the transfer is compliant. if (isOverride) { return compliance.canOverride(msg.sender, from, to, tokens); } else { return compliance.canTransfer(msg.sender, from, to, tokens); } } /** * @dev Transfers tokens from one address to another * @param from The sender address. * @param to The recipient address. * @param tokens The number of tokens being transferred. */ function transferTokens(address from, address to, uint256 tokens) private { // Update balances balances[from] = balances[from].subtract(tokens); balances[to] = balances[to].add(tokens); emit Transfer(from, to, tokens); // Adds the shareholder if they don't already exist. if (balances[to] > 0 && shareholders.append(to)) { emit ShareholderAdded(to); } // Remove the shareholder if they no longer hold tokens. if (balances[from] == 0 && shareholders.remove(from)) { emit ShareholderRemoved(from); } } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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Compliance","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"original","type":"address"},{"indexed":true,"name":"replacement","type":"address"},{"indexed":true,"name":"sender","type":"address"}],"name":"VerifiedAddressSuperseded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousIssuer","type":"address"},{"indexed":true,"name":"newIssuer","type":"address"}],"name":"IssuerSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"tokens","type":"uint256"}],"name":"Issue","type":"event"},{"anonymous":false,"inputs":[],"name":"IssueFinished","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"shareholder","type":"address"}],"name":"ShareholderAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"shareholder","type":"address"}],"name":"ShareholderRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"oldOwner","type":"address"},{"indexed":true,"name":"newOwner","type":"address"}],"name":"OwnerTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"},{"indexed":true,"name":"spender","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Transfer","type":"event"}]
Contract Creation Code
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Swarm Source
bzzr://aaa9c0c19f6c5795773194111572f9115f68c17c15fbd5386874d0078fb81b82
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