Contract 0x226bb599a12c826476e3a771454697ea52e9e220

 

TxHash Block Age From To Value [TxFee]
0xead78bb14b8736763740a65b545c54c99aded99b83132c71a6fc28892eaae50072462951 hr 8 mins agoLiqui.io_2 IN  Propy0 Ether0.00126505
0xbfe9a034ec38bc5b2ecd0c9d421a0c541701cdf9568c760c0e8dfe5a38b1ad3a72459762 hrs 48 mins ago0xe713990d79a445fd060a5e0b2a50c33e2934eb74 IN  Propy0 Ether0.00131522
0x01c4d68717199f7376a45d9c75fcc69e1a38c13b2e924645e90c905f71c641ad72456324 hrs 46 mins agoBittrex_1 IN  Propy0 Ether0.00632525
0x448f22914783fdf2c4ddff007b3cee0a3b804b7142f461d25ae4870b5981d22872450737 hrs 52 mins agoLiqui.io_2 IN  Propy0 Ether0.001391555
0xf5d00265f9d803f84ff424114f97149d9d2345754fa14b1b1f2612ca08ebc6c9724380915 hrs 17 mins ago0x9f2425cc5cb9d317c637722510e521f15bab1f74 IN  Propy0 Ether0.001792175
0x801e8e9c6982ad1b90cd28116df4b9c35f1cdcb0fedfadbd20f74c228d4836a1724354416 hrs 45 mins agoHuobi_7 IN  Propy0 Ether0.0025301
0x4c3125038d72744b3f2c3d42224527c7c8c0dc92c04c20bbf35a2cf219eeb4ab72422601 day 3 mins agoLiqui.io_2 IN  Propy0 Ether0.00126505
0x13a69e6f9e347023288605a29effc9ad75b117a99bab217d4c8fe9495eb512e072410651 day 6 hrs agoLiqui.io_2 IN  Propy0 Ether0.00080841761
0xa6d77a22e13efae3eeddf4a7cd351fe526f7bfcc879bd0b2ae2e3027de2cd65772409731 day 7 hrs ago0x39ea445a457216ef51a1d71048ee586eea3531d9 IN  Propy0 Ether0.0004613427
0xe67579a378bb3a152587ce35208f25173390d161e2d617e5621f3ebe7dca2a7872401971 day 11 hrs ago0x9dc3219ae0b732ac2896a6bd800fef6d58b69888 IN  Propy0 Ether0.000985455
0xd11ceca8673e48db4eb55e1840417a9bc605809603a505761d38b8334d80617e72401931 day 11 hrs ago0x9dc3219ae0b732ac2896a6bd800fef6d58b69888 IN  Propy0 Ether0.00099954
0x753f9c3225541cfcbc4bbe78c496f8affd40c02f367454577010a96c40b5978572382081 day 22 hrs agoLiqui.io_2 IN  Propy0 Ether0.00126441
0x55813e5c5732782ba3db15f4b324e8dc8fff06e5e22d4df6b6d76810df6a854372380651 day 23 hrs ago0xb126ae241852f95bba8e46eaf9f378435f9156c9 IN  Propy0 Ether0.004571705
0xa3801dc86d9f5739d570fbc04d5837f204bb8847199417cdb207305ed9dba01d72376972 days 1 hr ago0x9f27791651c36e697336101280dcbac5eb171396 IN  Propy0 Ether0.00126441
0x1e7f8a502985a00e158fdafa1a275ec6017faa2de632d4cd1477b6f3b42fa60172375812 days 2 hrs ago0x1a47c809d36a4c34a9a7764f5339e07f88e4d05e IN  Propy0 Ether0.000642879
0xd8d5b43704228908c8bd6303a0acbf2e7569b2ee0d37d0858e22901f548f577e72375472 days 2 hrs ago0xdde06b82bb110bbf8896baaa22bb8b0f1c1fbac5 IN  Propy0 Ether0.00131522
0xea9cb435e06c238f41bcbeb23ba771b26b7d9315054f4994eb9b68650879a6af72374522 days 2 hrs agoHitBTC_3 IN  Propy0 Ether0.00065697
0xc165acde9e09c74637ad78fcc5d172631e321912e82be926e07761b4e606c98272370952 days 4 hrs ago0x2b1a119aaefdb50efdbcd6af79363f530bc4029a IN  Propy0 Ether0.004571705
0x633df88f3084afc10824df2af8006d38899835e76a428a3c95156410cd2c943e72367832 days 6 hrs agoBittrex_1 IN  Propy0 Ether0.00403485
0x3a15d00cada1c40cd32d7f1ac8f4d7b16fd4dd61e5e01dd8fd50be1f5a50e05b72361612 days 10 hrs ago0x15cf514ffd981ab69ad69133dbb6887d24898501 IN  Propy0 Ether0.000761415026
0x92d2afdcee7673df59392792174125a1835709222c025e0e257601c0cd48e8ff72360272 days 11 hrs ago0x8d4d4770d299c2a3b381fc1cf1e128803848604f IN  Propy0 Ether0.00253485
0x20450a516c7e1a9ad3dbe77a0c8ec39a69549b665da0d07b94c71a2e100cf98372357242 days 12 hrs ago0xd91935a7e596a2db0361313defd2f8e08d697c73 IN  Propy0 Ether0.00161522
0x2043350792af5af32e448d2e9cde68853a732e4a3efa4e6eccd0f033f2efa40872352472 days 15 hrs ago0xd91935a7e596a2db0361313defd2f8e08d697c73 IN  Propy0 Ether0.00252882
0x71edbf6e5eade36adb84d6fb46a5c9f6c638a817284fd04370c8a2269a949b0972351492 days 16 hrs ago0x20bef9a0cf1aad9fb9da3db9e3dc971d3d2db38c IN  Propy0 Ether0.00632205
0xa42b5fc2d8befb258a0950ebc4674c8c8e1b0f0537d2bdca9bce885be9ce763172344942 days 19 hrs ago0x9954e3b5b06217296d5e811a16d045a08f2a2f17 IN  Propy0 Ether0.004571705
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Latest 22 Internal Transactions Internal Transactions as a result of Contract Execution

Parent TxHash Block Age From To Value
0x1976209e799150c5d72501582d552636d636cacc62859df9f4e782e4dd9ad08a5120732366 days 2 hrs ago0x226bb599a12c826476e3a771454697ea52e9e2200x8d342b9474033a8ed04ff1ab654c64cf5b71daa10.000000001 Ether
0x787c138279a5fe71b2f049b9372df49c077297e197e4e13eee584324463985424818434418 days 10 hrs ago0x226bb599a12c826476e3a771454697ea52e9e2200x8d342b9474033a8ed04ff1ab654c64cf5b71daa10.002 Ether
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0x982639874586886fe7c8765d7430a277689f288ab5ea519bf482a778666884684743426431 days 7 hrs ago0x226bb599a12c826476e3a771454697ea52e9e2200x8d342b9474033a8ed04ff1ab654c64cf5b71daa10.29 Ether
0xe9d99bbbbbc4db186517e277548f0d7ff1940a07a46a786573b5d398475481e34743381431 days 8 hrs ago0x226bb599a12c826476e3a771454697ea52e9e2200x8d342b9474033a8ed04ff1ab654c64cf5b71daa10.3 Ether
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0xd6c225e1554a2b1eab673378b313aff28815d70b96c8005194b3ede3818bb5904160997554 days 10 hrs ago0x226bb599a12c826476e3a771454697ea52e9e2200x729aa9df8b31969ac73110de62823d2f607ae4255 Ether
0x4a064d57d5e3ef2043ce5ab27e26118e19465c9f076ddbf507d3b8ce3873a2894160995554 days 10 hrs ago0x226bb599a12c826476e3a771454697ea52e9e2200x729aa9df8b31969ac73110de62823d2f607ae4255 Ether
0xd90655618dcdf2e822128d0c30f82aa3c22bec79b3a83ae438e9d52147ef59494160988554 days 10 hrs ago0x226bb599a12c826476e3a771454697ea52e9e2200x729aa9df8b31969ac73110de62823d2f607ae4251.5 Ether
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Contract Name: PropyToken
Compiler Version: v0.4.8+commit.60cc1668
Optimization Enabled: Yes
Runs (Optimizer):  200


Contract Source Code
/**
 * This software is a subject to Ambisafe License Agreement.
 * No use or distribution is allowed without written permission from Ambisafe.
 * https://www.ambisafe.co/terms-of-use/
 */

pragma solidity 0.4.8;

contract EToken2 {
    function baseUnit(bytes32 _symbol) constant returns(uint8);
    function name(bytes32 _symbol) constant returns(string);
    function description(bytes32 _symbol) constant returns(string);
    function owner(bytes32 _symbol) constant returns(address);
    function isOwner(address _owner, bytes32 _symbol) constant returns(bool);
    function totalSupply(bytes32 _symbol) constant returns(uint);
    function balanceOf(address _holder, bytes32 _symbol) constant returns(uint);
    function isLocked(bytes32 _symbol) constant returns(bool);
    function proxyTransferFromToICAPWithReference(address _from, bytes32 _icap, uint _value, string _reference, address _sender) returns(bool);
    function proxyApprove(address _spender, uint _value, bytes32 _symbol, address _sender) returns(bool);
    function allowance(address _from, address _spender, bytes32 _symbol) constant returns(uint);
    function proxyTransferFromWithReference(address _from, address _to, uint _value, bytes32 _symbol, string _reference, address _sender) returns(bool);
}

contract Asset {
    function _performTransferWithReference(address _to, uint _value, string _reference, address _sender) returns(bool);
    function _performTransferToICAPWithReference(bytes32 _icap, uint _value, string _reference, address _sender) returns(bool);
    function _performApprove(address _spender, uint _value, address _sender) returns(bool);    
    function _performTransferFromWithReference(address _from, address _to, uint _value, string _reference, address _sender) returns(bool);
    function _performTransferFromToICAPWithReference(address _from, bytes32 _icap, uint _value, string _reference, address _sender) returns(bool);
    function _performGeneric(bytes _data, address _sender) payable returns(bytes32) {
        throw;
    }
}

contract ERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed from, address indexed spender, uint256 value);

    function totalSupply() constant returns(uint256 supply);
    function balanceOf(address _owner) constant returns(uint256 balance);
    function transfer(address _to, uint256 _value) returns(bool success);
    function transferFrom(address _from, address _to, uint256 _value) returns(bool success);
    function approve(address _spender, uint256 _value) returns(bool success);
    function allowance(address _owner, address _spender) constant returns(uint256 remaining);
    function decimals() constant returns(uint8);
}

contract AssetProxyInterface {
    function _forwardApprove(address _spender, uint _value, address _sender) returns(bool);    
    function _forwardTransferFromWithReference(address _from, address _to, uint _value, string _reference, address _sender) returns(bool);
    function _forwardTransferFromToICAPWithReference(address _from, bytes32 _icap, uint _value, string _reference, address _sender) returns(bool);
}

contract Bytes32 {
    function _bytes32(string _input) internal constant returns(bytes32 result) {
        assembly {
            result := mload(add(_input, 32))
        }
    }
}

/**
 * @title EToken2 Asset Proxy.
 *
 * Proxy implements ERC20 interface and acts as a gateway to a single EToken2 asset.
 * Proxy adds etoken2Symbol and caller(sender) when forwarding requests to EToken2.
 * Every request that is made by caller first sent to the specific asset implementation
 * contract, which then calls back to be forwarded onto EToken2.
 *
 * Calls flow: Caller ->
 *             Proxy.func(...) ->
 *             Asset._performFunc(..., Caller.address) ->
 *             Proxy._forwardFunc(..., Caller.address) ->
 *             Platform.proxyFunc(..., symbol, Caller.address)
 *
 * Generic call flow: Caller ->
 *             Proxy.unknownFunc(...) ->
 *             Asset._performGeneric(..., Caller.address) ->
 *             Asset.unknownFunc(...)
 *
 * Asset implementation contract is mutable, but each user have an option to stick with
 * old implementation, through explicit decision made in timely manner, if he doesn't agree
 * with new rules.
 * Each user have a possibility to upgrade to latest asset contract implementation, without the
 * possibility to rollback.
 *
 * Note: all the non constant functions return false instead of throwing in case if state change
 * didn't happen yet.
 */
contract AssetProxy is ERC20, AssetProxyInterface, Bytes32 {
    // Assigned EToken2, immutable.
    EToken2 public etoken2;

    // Assigned symbol, immutable.
    bytes32 public etoken2Symbol;

    // Assigned name, immutable. For UI.
    string public name;
    string public symbol;

    /**
     * Sets EToken2 address, assigns symbol and name.
     *
     * Can be set only once.
     *
     * @param _etoken2 EToken2 contract address.
     * @param _symbol assigned symbol.
     * @param _name assigned name.
     *
     * @return success.
     */
    function init(EToken2 _etoken2, string _symbol, string _name) returns(bool) {
        if (address(etoken2) != 0x0) {
            return false;
        }
        etoken2 = _etoken2;
        etoken2Symbol = _bytes32(_symbol);
        name = _name;
        symbol = _symbol;
        return true;
    }

    /**
     * Only EToken2 is allowed to call.
     */
    modifier onlyEToken2() {
        if (msg.sender == address(etoken2)) {
            _;
        }
    }

    /**
     * Only current asset owner is allowed to call.
     */
    modifier onlyAssetOwner() {
        if (etoken2.isOwner(msg.sender, etoken2Symbol)) {
            _;
        }
    }

    /**
     * Returns asset implementation contract for current caller.
     *
     * @return asset implementation contract.
     */
    function _getAsset() internal returns(Asset) {
        return Asset(getVersionFor(msg.sender));
    }

    function recoverTokens(uint _value) onlyAssetOwner() returns(bool) {
        return this.transferWithReference(msg.sender, _value, 'Tokens recovery');
    }

    /**
     * Returns asset total supply.
     *
     * @return asset total supply.
     */
    function totalSupply() constant returns(uint) {
        return etoken2.totalSupply(etoken2Symbol);
    }

    /**
     * Returns asset balance for a particular holder.
     *
     * @param _owner holder address.
     *
     * @return holder balance.
     */
    function balanceOf(address _owner) constant returns(uint) {
        return etoken2.balanceOf(_owner, etoken2Symbol);
    }

    /**
     * Returns asset allowance from one holder to another.
     *
     * @param _from holder that allowed spending.
     * @param _spender holder that is allowed to spend.
     *
     * @return holder to spender allowance.
     */
    function allowance(address _from, address _spender) constant returns(uint) {
        return etoken2.allowance(_from, _spender, etoken2Symbol);
    }

    /**
     * Returns asset decimals.
     *
     * @return asset decimals.
     */
    function decimals() constant returns(uint8) {
        return etoken2.baseUnit(etoken2Symbol);
    }

    /**
     * Transfers asset balance from the caller to specified receiver.
     *
     * @param _to holder address to give to.
     * @param _value amount to transfer.
     *
     * @return success.
     */
    function transfer(address _to, uint _value) returns(bool) {
        return transferWithReference(_to, _value, '');
    }

    /**
     * Transfers asset balance from the caller to specified receiver adding specified comment.
     * Resolves asset implementation contract for the caller and forwards there arguments along with
     * the caller address.
     *
     * @param _to holder address to give to.
     * @param _value amount to transfer.
     * @param _reference transfer comment to be included in a EToken2's Transfer event.
     *
     * @return success.
     */
    function transferWithReference(address _to, uint _value, string _reference) returns(bool) {
        return _getAsset()._performTransferWithReference(_to, _value, _reference, msg.sender);
    }

    /**
     * Transfers asset balance from the caller to specified ICAP.
     *
     * @param _icap recipient ICAP to give to.
     * @param _value amount to transfer.
     *
     * @return success.
     */
    function transferToICAP(bytes32 _icap, uint _value) returns(bool) {
        return transferToICAPWithReference(_icap, _value, '');
    }

    /**
     * Transfers asset balance from the caller to specified ICAP adding specified comment.
     * Resolves asset implementation contract for the caller and forwards there arguments along with
     * the caller address.
     *
     * @param _icap recipient ICAP to give to.
     * @param _value amount to transfer.
     * @param _reference transfer comment to be included in a EToken2's Transfer event.
     *
     * @return success.
     */
    function transferToICAPWithReference(bytes32 _icap, uint _value, string _reference) returns(bool) {
        return _getAsset()._performTransferToICAPWithReference(_icap, _value, _reference, msg.sender);
    }

    /**
     * Prforms allowance transfer of asset balance between holders.
     *
     * @param _from holder address to take from.
     * @param _to holder address to give to.
     * @param _value amount to transfer.
     *
     * @return success.
     */
    function transferFrom(address _from, address _to, uint _value) returns(bool) {
        return transferFromWithReference(_from, _to, _value, '');
    }

    /**
     * Prforms allowance transfer of asset balance between holders adding specified comment.
     * Resolves asset implementation contract for the caller and forwards there arguments along with
     * the caller address.
     *
     * @param _from holder address to take from.
     * @param _to holder address to give to.
     * @param _value amount to transfer.
     * @param _reference transfer comment to be included in a EToken2's Transfer event.
     *
     * @return success.
     */
    function transferFromWithReference(address _from, address _to, uint _value, string _reference) returns(bool) {
        return _getAsset()._performTransferFromWithReference(_from, _to, _value, _reference, msg.sender);
    }

    /**
     * Performs transfer call on the EToken2 by the name of specified sender.
     *
     * Can only be called by asset implementation contract assigned to sender.
     *
     * @param _from holder address to take from.
     * @param _to holder address to give to.
     * @param _value amount to transfer.
     * @param _reference transfer comment to be included in a EToken2's Transfer event.
     * @param _sender initial caller.
     *
     * @return success.
     */
    function _forwardTransferFromWithReference(address _from, address _to, uint _value, string _reference, address _sender) onlyImplementationFor(_sender) returns(bool) {
        return etoken2.proxyTransferFromWithReference(_from, _to, _value, etoken2Symbol, _reference, _sender);
    }

    /**
     * Prforms allowance transfer of asset balance between holders.
     *
     * @param _from holder address to take from.
     * @param _icap recipient ICAP address to give to.
     * @param _value amount to transfer.
     *
     * @return success.
     */
    function transferFromToICAP(address _from, bytes32 _icap, uint _value) returns(bool) {
        return transferFromToICAPWithReference(_from, _icap, _value, '');
    }

    /**
     * Prforms allowance transfer of asset balance between holders adding specified comment.
     * Resolves asset implementation contract for the caller and forwards there arguments along with
     * the caller address.
     *
     * @param _from holder address to take from.
     * @param _icap recipient ICAP address to give to.
     * @param _value amount to transfer.
     * @param _reference transfer comment to be included in a EToken2's Transfer event.
     *
     * @return success.
     */
    function transferFromToICAPWithReference(address _from, bytes32 _icap, uint _value, string _reference) returns(bool) {
        return _getAsset()._performTransferFromToICAPWithReference(_from, _icap, _value, _reference, msg.sender);
    }

    /**
     * Performs allowance transfer to ICAP call on the EToken2 by the name of specified sender.
     *
     * Can only be called by asset implementation contract assigned to sender.
     *
     * @param _from holder address to take from.
     * @param _icap recipient ICAP address to give to.
     * @param _value amount to transfer.
     * @param _reference transfer comment to be included in a EToken2's Transfer event.
     * @param _sender initial caller.
     *
     * @return success.
     */
    function _forwardTransferFromToICAPWithReference(address _from, bytes32 _icap, uint _value, string _reference, address _sender) onlyImplementationFor(_sender) returns(bool) {
        return etoken2.proxyTransferFromToICAPWithReference(_from, _icap, _value, _reference, _sender);
    }

    /**
     * Sets asset spending allowance for a specified spender.
     * Resolves asset implementation contract for the caller and forwards there arguments along with
     * the caller address.
     *
     * @param _spender holder address to set allowance to.
     * @param _value amount to allow.
     *
     * @return success.
     */
    function approve(address _spender, uint _value) returns(bool) {
        return _getAsset()._performApprove(_spender, _value, msg.sender);
    }

    /**
     * Performs allowance setting call on the EToken2 by the name of specified sender.
     *
     * Can only be called by asset implementation contract assigned to sender.
     *
     * @param _spender holder address to set allowance to.
     * @param _value amount to allow.
     * @param _sender initial caller.
     *
     * @return success.
     */
    function _forwardApprove(address _spender, uint _value, address _sender) onlyImplementationFor(_sender) returns(bool) {
        return etoken2.proxyApprove(_spender, _value, etoken2Symbol, _sender);
    }

    /**
     * Emits ERC20 Transfer event on this contract.
     *
     * Can only be, and, called by assigned EToken2 when asset transfer happens.
     */
    function emitTransfer(address _from, address _to, uint _value) onlyEToken2() {
        Transfer(_from, _to, _value);
    }

    /**
     * Emits ERC20 Approval event on this contract.
     *
     * Can only be, and, called by assigned EToken2 when asset allowance set happens.
     */
    function emitApprove(address _from, address _spender, uint _value) onlyEToken2() {
        Approval(_from, _spender, _value);
    }

    /**
     * Resolves asset implementation contract for the caller and forwards there transaction data,
     * along with the value. This allows for proxy interface growth.
     */
    function () payable {
        bytes32 result = _getAsset()._performGeneric.value(msg.value)(msg.data, msg.sender);
        assembly {
            mstore(0, result)
            return(0, 32)
        }
    }

    /**
     * Indicates an upgrade freeze-time start, and the next asset implementation contract.
     */
    event UpgradeProposal(address newVersion);

    // Current asset implementation contract address.
    address latestVersion;

    // Proposed next asset implementation contract address.
    address pendingVersion;

    // Upgrade freeze-time start.
    uint pendingVersionTimestamp;

    // Timespan for users to review the new implementation and make decision.
    uint constant UPGRADE_FREEZE_TIME = 3 days;

    // Asset implementation contract address that user decided to stick with.
    // 0x0 means that user uses latest version.
    mapping(address => address) userOptOutVersion;

    /**
     * Only asset implementation contract assigned to sender is allowed to call.
     */
    modifier onlyImplementationFor(address _sender) {
        if (getVersionFor(_sender) == msg.sender) {
            _;
        }
    }

    /**
     * Returns asset implementation contract address assigned to sender.
     *
     * @param _sender sender address.
     *
     * @return asset implementation contract address.
     */
    function getVersionFor(address _sender) constant returns(address) {
        return userOptOutVersion[_sender] == 0 ? latestVersion : userOptOutVersion[_sender];
    }

    /**
     * Returns current asset implementation contract address.
     *
     * @return asset implementation contract address.
     */
    function getLatestVersion() constant returns(address) {
        return latestVersion;
    }

    /**
     * Returns proposed next asset implementation contract address.
     *
     * @return asset implementation contract address.
     */
    function getPendingVersion() constant returns(address) {
        return pendingVersion;
    }

    /**
     * Returns upgrade freeze-time start.
     *
     * @return freeze-time start.
     */
    function getPendingVersionTimestamp() constant returns(uint) {
        return pendingVersionTimestamp;
    }

    /**
     * Propose next asset implementation contract address.
     *
     * Can only be called by current asset owner.
     *
     * Note: freeze-time should not be applied for the initial setup.
     *
     * @param _newVersion asset implementation contract address.
     *
     * @return success.
     */
    function proposeUpgrade(address _newVersion) onlyAssetOwner() returns(bool) {
        // Should not already be in the upgrading process.
        if (pendingVersion != 0x0) {
            return false;
        }
        // New version address should be other than 0x0.
        if (_newVersion == 0x0) {
            return false;
        }
        // Don't apply freeze-time for the initial setup.
        if (latestVersion == 0x0) {
            latestVersion = _newVersion;
            return true;
        }
        pendingVersion = _newVersion;
        pendingVersionTimestamp = now;
        UpgradeProposal(_newVersion);
        return true;
    }

    /**
     * Cancel the pending upgrade process.
     *
     * Can only be called by current asset owner.
     *
     * @return success.
     */
    function purgeUpgrade() onlyAssetOwner() returns(bool) {
        if (pendingVersion == 0x0) {
            return false;
        }
        delete pendingVersion;
        delete pendingVersionTimestamp;
        return true;
    }

    /**
     * Finalize an upgrade process setting new asset implementation contract address.
     *
     * Can only be called after an upgrade freeze-time.
     *
     * @return success.
     */
    function commitUpgrade() returns(bool) {
        if (pendingVersion == 0x0) {
            return false;
        }
        if (pendingVersionTimestamp + UPGRADE_FREEZE_TIME > now) {
            return false;
        }
        latestVersion = pendingVersion;
        delete pendingVersion;
        delete pendingVersionTimestamp;
        return true;
    }

    /**
     * Disagree with proposed upgrade, and stick with current asset implementation
     * until further explicit agreement to upgrade.
     *
     * @return success.
     */
    function optOut() returns(bool) {
        if (userOptOutVersion[msg.sender] != 0x0) {
            return false;
        }
        userOptOutVersion[msg.sender] = latestVersion;
        return true;
    }

    /**
     * Implicitly agree to upgrade to current and future asset implementation upgrades,
     * until further explicit disagreement.
     *
     * @return success.
     */
    function optIn() returns(bool) {
        delete userOptOutVersion[msg.sender];
        return true;
    }

    // Backwards compatibility.
    function multiAsset() constant returns(EToken2) {
        return etoken2;
    }
}

contract PropyToken is AssetProxy {
    function change(string _symbol, string _name) onlyAssetOwner() returns(bool) {
        if (etoken2.isLocked(etoken2Symbol)) {
            return false;
        }
        name = _name;
        symbol = _symbol;
        return true;
    }
}

Contract ABI
[{"constant":true,"inputs":[],"name":"multiAsset","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"commitUpgrade","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"getLatestVersion","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"},{"name":"_reference","type":"string"},{"name":"_sender","type":"address"}],"name":"_forwardTransferFromWithReference","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"emitApprove","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"emitTransfer","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_value","type":"uint256"}],"name":"recoverTokens","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"etoken2","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"getPendingVersionTimestamp","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"purgeUpgrade","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"optIn","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"},{"name":"_reference","type":"string"}],"name":"transferFromWithReference","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_icap","type":"bytes32"},{"name":"_value","type":"uint256"}],"name":"transferToICAP","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_icap","type":"bytes32"},{"name":"_value","type":"uint256"},{"name":"_reference","type":"string"}],"name":"transferToICAPWithReference","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"},{"name":"_sender","type":"address"}],"name":"_forwardApprove","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_symbol","type":"string"},{"name":"_name","type":"string"}],"name":"change","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_icap","type":"bytes32"},{"name":"_value","type":"uint256"},{"name":"_reference","type":"string"},{"name":"_sender","type":"address"}],"name":"_forwardTransferFromToICAPWithReference","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_icap","type":"bytes32"},{"name":"_value","type":"uint256"},{"name":"_reference","type":"string"}],"name":"transferFromToICAPWithReference","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_icap","type":"bytes32"},{"name":"_value","type":"uint256"}],"name":"transferFromToICAP","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"etoken2Symbol","outputs":[{"name":"","type":"bytes32"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"getPendingVersion","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"},{"name":"_reference","type":"string"}],"name":"transferWithReference","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_etoken2","type":"address"},{"name":"_symbol","type":"string"},{"name":"_name","type":"string"}],"name":"init","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_newVersion","type":"address"}],"name":"proposeUpgrade","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"optOut","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_from","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_sender","type":"address"}],"name":"getVersionFor","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"payable":true,"type":"fallback"},{"anonymous":false,"inputs":[{"indexed":false,"name":"newVersion","type":"address"}],"name":"UpgradeProposal","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"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"spender","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Approval","type":"event"}]

Contract Creation Code
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   Swarm Source:
bzzr://921b47fe3810a9ce6b238d40c647951315aa5f116d1c85ffe01639754dfda9a6
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