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Outline

• interface tokenRecipient function re ...
•  contract OysterShell *
•    - function OysterShell()
•    - function balanceOf(address _owner)
•    - function lockTime(address _owner)
•    - function transferDirector(address new ...
•    - function withdrawFunds()
•    - function selfLock()
•    - function amendFee(uint256 feeAmountSe ...
•    - function amendRetention(uint256 reten ...
•    - function amendLock(uint256 lockMinSet ...
•    - function lock(uint256 _duration)
•    - function claim(address _payout, addre ...
•    - function ()
•    - function _transfer(address _from, add ...
•    - function transfer(address _to, uint25 ...
•    - function transferFrom(address _from, ...
•    - function approve(address _spender, ui ...
•    - function approveAndCall(address _spen ...
•    - function burn(uint256 _value)
•    - function burnFrom(address _from, uint ...

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/**
 *Submitted for verification at Etherscan.io on 2018-04-13
*/

pragma solidity ^0.4.18;

interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) public; }

contract OysterShell {
    // Public variables of SHL
    string public name;
    string public symbol;
    uint8 public decimals;
    uint256 public totalSupply;
    uint256 public lockedSupply;
    address public director;
    bool public directorLock;
    uint256 public feeAmount;
    uint256 public retentionMin;
    uint256 public retentionMax;
    uint256 public lockMin;
    uint256 public lockMax;

    // Array definitions
    mapping (address => uint256) public balances;
    mapping (address => mapping (address => uint256)) public allowance;
    mapping (address => uint256) public locked;

    // ERC20 event
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    
    // ERC20 event
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);

    // This notifies clients about the amount burnt
    event Burn(address indexed _from, uint256 _value);
    
    // This notifies clients about an address getting locked
    event Lock(address indexed _target, uint256 _value, uint256 _release);
    
    // This notifies clients about a claim being made on a locked address
    event Claim(address indexed _target, address indexed _payout, address indexed _fee);

    /**
     * Constructor function
     *
     * Initializes contract
     */
    function OysterShell() public {
        director = msg.sender;
        name = "Oyster Shell";
        symbol = "SHL";
        decimals = 18;
        directorLock = false;
        totalSupply = 98592692 * 10 ** uint256(decimals);
        lockedSupply = 0;
        
        // Assign total SHL supply to the director
        balances[director] = totalSupply;
        
        // SHL fee paid to brokers
        feeAmount = 1 * 10 ** uint256(decimals);
        
        // Minimum SHL that can get locked
        retentionMin = 20 * 10 ** uint256(decimals);
        
        // Maximum SHL that can get locked
        retentionMax = 200 * 10 ** uint256(decimals);
        
        // Minimum lock duration
        lockMin = 10;
        
        // Maximum lock duration
        lockMax = 360;
    }
    
    /**
     * ERC20 balance function
     */
    function balanceOf(address _owner) public constant returns (uint256 balance) {
        return balances[_owner];
    }
    
    /**
     * SHL lock time retrieval function
     */
    function lockTime(address _owner) public constant returns (uint256 lockedValue) {
        return locked[_owner];
    }
    
    modifier onlyDirector {
        // Director can lock themselves out to complete decentralization of Oyster network
        // An alternative is that another smart contract could become the decentralized director
        require(!directorLock);
        
        // Only the director is permitted
        require(msg.sender == director);
        _;
    }
    
    modifier onlyDirectorForce {
        // Only the director is permitted
        require(msg.sender == director);
        _;
    }
    
    /**
     * Transfers the director to a new address
     */
    function transferDirector(address newDirector) public onlyDirectorForce {
        director = newDirector;
    }
    
    /**
     * Withdraw funds from the contract
     */
    function withdrawFunds() public onlyDirectorForce {
        director.transfer(this.balance);
    }
    
    /**
     * Permanently lock out the director to decentralize Oyster
     * Invocation is discretionary because Oyster might be better suited to
     * transition to an artificially intelligent smart contract director
     */
    function selfLock() public payable onlyDirector {
        // Prevents accidental lockout
        require(msg.value == 10 ether);
        
        // Permanently lock out the director
        directorLock = true;
    }
    
    /**
     * Director can alter the broker fee rate
     */
    function amendFee(uint256 feeAmountSet) public onlyDirector returns (bool success) {
        feeAmount = feeAmountSet;
        return true;
    }
    
    /**
     * Director can alter the upper and lower bounds of SHL locking capacity
     */
    function amendRetention(uint256 retentionMinSet, uint256 retentionMaxSet) public onlyDirector returns (bool success) {
        // Set retentionMin
        retentionMin = retentionMinSet;
        
        // Set retentionMax
        retentionMax = retentionMaxSet;
        return true;
    }
    
    /**
     * Director can alter the upper and lower bounds of SHL locking duration
     */
    function amendLock(uint256 lockMinSet, uint256 lockMaxSet) public onlyDirector returns (bool success) {
        // Set lockMin
        lockMin = lockMinSet;
        
        // Set lockMax
        lockMax = lockMaxSet;
        return true;
    }
    
    /**
     * Oyster Protocol Function
     * More information at https://oyster.ws/ShellWhitepaper.pdf
     * 
     * Lock an address
     *
     * @param _duration the time duration that the SHL should remain locked
     */
    function lock(uint256 _duration) public returns (bool success) {
        // The address must be previously unlocked
        require(locked[msg.sender] == 0);
        
        // An address must have at least retentionMin to be locked
        require(balances[msg.sender] >= retentionMin);
        
        // Prevent addresses with large balances from getting locked
        require(balances[msg.sender] <= retentionMax);
        
        // Enforce minimum lock duration
        require(_duration >= lockMin);
        
        // Enforce maximum lock duration
        require(_duration <= lockMax);
        
        // Set locked state to true
        locked[msg.sender] = block.timestamp + _duration;
        
        // Add to lockedSupply
        lockedSupply += balances[msg.sender];
        
        // Execute an event reflecting the change
        Lock(msg.sender, balances[msg.sender], locked[msg.sender]);
        return true;
    }
    
    /**
     * Oyster Protocol Function
     * More information at https://oyster.ws/ShellWhitepaper.pdf
     * 
     * Claim all SHL from a locked address
     *
     * @param _payout the address of the website owner
     * @param _fee the address of the broker node
     */
    function claim(address _payout, address _fee) public returns (bool success) {
        // The claimed address must have already been locked
        require(locked[msg.sender] <= block.timestamp && locked[msg.sender] != 0);
        
        // The payout and fee addresses must be different
        require(_payout != _fee);
        
        // The claimed address cannot pay itself
        require(msg.sender != _payout);
        
        // The claimed address cannot pay itself
        require(msg.sender != _fee);
        
        // Check if the locked address has enough
        require(balances[msg.sender] >= retentionMin);
        
        // Save this for an assertion in the future
        uint256 previousBalances = balances[msg.sender] + balances[_payout] + balances[_fee];
        
        // Calculate amount to be paid to _payout
        uint256 payAmount = balances[msg.sender] - feeAmount;
        
        // Take from lockedSupply
        lockedSupply -= balances[msg.sender];
        
        // Reset locked address balance to zero
        balances[msg.sender] = 0;
        
        // Pay the website owner that invoked the web node that found the SHL seed key
        balances[_payout] += payAmount;
        
        // Pay the broker node that unlocked the SHL
        balances[_fee] += feeAmount;
        
        // Execute events to reflect the changes
        Claim(msg.sender, _payout, _fee);
        Transfer(msg.sender, _payout, payAmount);
        Transfer(msg.sender, _fee, feeAmount);
        
        // Failsafe logic that should never be false
        assert(balances[msg.sender] + balances[_payout] + balances[_fee] == previousBalances);
        return true;
    }
    
    /**
     * Crowdsale function
     */
    function () public payable {
        // Prevent ETH from getting sent to contract
        require(false);
    }

    /**
     * Internal transfer, can be called by this contract only
     */
    function _transfer(address _from, address _to, uint _value) internal {
        // Sending addresses cannot be locked
        require(locked[_from] == 0);
        
        // If the receiving address is locked, it cannot exceed retentionMax
        if (locked[_to] > 0) {
            require(balances[_to] + _value <= retentionMax);
        }
        
        // Prevent transfer to 0x0 address, use burn() instead
        require(_to != 0x0);
        
        // Check if the sender has enough
        require(balances[_from] >= _value);
        
        // Check for overflows
        require(balances[_to] + _value > balances[_to]);
        
        // Save this for an assertion in the future
        uint256 previousBalances = balances[_from] + balances[_to];
        
        // Subtract from the sender
        balances[_from] -= _value;
        
        // Add the same to the recipient
        balances[_to] += _value;
        Transfer(_from, _to, _value);
        
        // Failsafe logic that should never be false
        assert(balances[_from] + balances[_to] == previousBalances);
    }

    /**
     * Transfer tokens
     *
     * Send `_value` tokens to `_to` from your account
     *
     * @param _to the address of the recipient
     * @param _value the amount to send
     */
    function transfer(address _to, uint256 _value) public {
        _transfer(msg.sender, _to, _value);
    }

    /**
     * Transfer tokens from other address
     *
     * Send `_value` tokens to `_to` in behalf of `_from`
     *
     * @param _from the address of the sender
     * @param _to the address of the recipient
     * @param _value the amount to send
     */
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        // Check allowance
        require(_value <= allowance[_from][msg.sender]);
        allowance[_from][msg.sender] -= _value;
        _transfer(_from, _to, _value);
        return true;
    }

    /**
     * Set allowance for other address
     *
     * Allows `_spender` to spend no more than `_value` tokens on your behalf
     *
     * @param _spender the address authorized to spend
     * @param _value the max amount they can spend
     */
    function approve(address _spender, uint256 _value) public returns (bool success) {
        // Locked addresses cannot be approved
        require(locked[msg.sender] == 0);
        
        allowance[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    /**
     * Set allowance for other address and notify
     *
     * Allows `_spender` to spend no more than `_value` tokens on your behalf, and then ping the contract about it
     *
     * @param _spender the address authorized to spend
     * @param _value the max amount they can spend
     * @param _extraData some extra information to send to the approved contract
     */
    function approveAndCall(address _spender, uint256 _value, bytes _extraData) public returns (bool success) {
        tokenRecipient spender = tokenRecipient(_spender);
        if (approve(_spender, _value)) {
            spender.receiveApproval(msg.sender, _value, this, _extraData);
            return true;
        }
    }

    /**
     * Destroy tokens
     *
     * Remove `_value` tokens from the system irreversibly
     *
     * @param _value the amount of money to burn
     */
    function burn(uint256 _value) public returns (bool success) {
        // Locked addresses cannot be burnt
        require(locked[msg.sender] == 0);
        
        // Check if the sender has enough
        require(balances[msg.sender] >= _value);
        
        // Subtract from the sender
        balances[msg.sender] -= _value;
        
        // Updates totalSupply
        totalSupply -= _value;
        Burn(msg.sender, _value);
        return true;
    }

    /**
     * Destroy tokens from other account
     *
     * Remove `_value` tokens from the system irreversibly on behalf of `_from`.
     *
     * @param _from the address of the sender
     * @param _value the amount of money to burn
     */
    function burnFrom(address _from, uint256 _value) public returns (bool success) {
        // Locked addresses cannot be burnt
        require(locked[_from] == 0);
        
        // Check if the targeted balance is enough
        require(balances[_from] >= _value);
        
        // Check allowance
        require(_value <= allowance[_from][msg.sender]);
        
        // Subtract from the targeted balance
        balances[_from] -= _value;
        
        // Subtract from the sender's allowance
        allowance[_from][msg.sender] -= _value;
        
        // Update totalSupply
        totalSupply -= _value;
        Burn(_from, _value);
        return true;
    }
}

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