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BokkyPooBah edited this page Apr 25, 2017 · 1 revision

Table of contents



Token Contract Information



Market Making Information

Creating Your Trade Contract

If you want to list an GNO TokenTrader contract on https://cryptoderivatives.market, use the TokenTraderFactory contract.

Execute createTradeContract(address asset, uint256 buyPrice, uint256 sellPrice, uint256 units, bool buysTokens, bool sellsTokens) to create your GNO TokenTrader contract.

The formula for working out the buyPrice or sellPrice follows:

rate = price / units * 10^(tokenDecimals - etherDecimals)

which is:

rate = price / units * 10^(tokenDecimals - 18)

and tokenDecimals = 0, so:

rate = price / units * 10^-18

Watching Your Trade Contract

Find your newly created Trade contract on https://cryptoderivatives.market/tokenTraderContracts. Watch this contract address using the ABI at How To Watch A TokenTrader Contract In Ethereum Wallet / Mist.

Depositing Tokens

Use the GNO token contract to transfer your tokens to your newly created TokenTrader address.

Depositing Ethers

Execute your TokenTrader.makerDepositEther() function, sending the amount of ethers.



How To Watch The Token Contract In Ethereum Wallet / Mist

In Ethereum Wallet / Mist, select the CONTRACTS tab and click WATCH CONTRACT to open the Watch contract window. Then:

  • Under CONTRACT NAME, enter GNO

  • Under CONTRACT ADDRESS, enter 0xc2921ea1c150405ef952f73952f37fa2746168d8

  • Copy the Application Binary Interface below and paste it into the JSON INTERFACE text box

    [{"constant":false,"inputs":[{"name":"addr","type":"address"},{"name":"state","type":"bool"}],"name":"setTransferAgent","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"mintingFinished","outputs":[{"name":"","type":"bool"}],"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":"success","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":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"addr","type":"address"}],"name":"setReleaseAgent","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"receiver","type":"address"},{"name":"amount","type":"uint256"}],"name":"mint","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"mintAgents","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"addr","type":"address"},{"name":"state","type":"bool"}],"name":"setMintAgent","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"value","type":"uint256"}],"name":"upgrade","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_upgradeMaster","type":"address"}],"name":"UpgradeAgentEnabledToken","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"upgradeAgent","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"releaseTokenTransfer","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"upgradeMaster","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"getUpgradeState","outputs":[{"name":"","type":"uint8"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"transferAgents","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"released","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"canUpgrade","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"totalUpgraded","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"releaseAgent","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"agent","type":"address"}],"name":"setUpgradeAgent","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"master","type":"address"}],"name":"setUpgradeMaster","outputs":[],"payable":false,"type":"function"},{"inputs":[{"name":"_name","type":"string"},{"name":"_symbol","type":"string"},{"name":"_initialSupply","type":"uint256"}],"payable":false,"type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Upgrade","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"agent","type":"address"}],"name":"UpgradeAgentSet","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":"owner","type":"address"},{"indexed":true,"name":"spender","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Approval","type":"event"}]

  • Click OK



How To Watch The Token In Ethereum Wallet / Mist

In Ethereum Wallet / Mist, select the CONTRACTS tab and click WATCH TOKEN to open the Add token window. Then:

  • Under TOKEN CONTRACT ADDRESS, enter 0xc2921ea1c150405ef952f73952f37fa2746168d8. The additional fields should automatically be filled in.

  • Click OK



How To Check Your Token Balance In Ethereum Wallet / Mist

Watch The Token Contract, then:

  • Click on the GNO contract
  • Click on SHOW CONTRACT INFO
  • In the READ FROM CONTRACT section and under Balance of:
  • Enter the address you want to check the token balance of
  • The token balance will be displayed in the Natural Units with 0 decimal places, e.g., 123 is 123 / 1e0 = 123 token units



How To Transfer Your Tokens In Ethereum Wallet / Mist

Watch The Token Contract, then:

  • Click on the GNO contract
  • Click on SHOW CONTRACT INFO
  • In the WRITE TO CONTRACT section and under Select function:
  • Select the Transfer function
  • Under to, enter the address you want to transfer the token to
  • Under value, enter the amount of tokens you want to transfer. This amount needs to be specified in the natural units with 0 decimal places, e.g., 123 is 123 / 1e0 = 123 token units
  • Under Execute from, select the account you want to transfer your tokens from
  • Click on Execute, then confirm your transaction



The Token Contract Source Code

The verified source code can be found at 0xc2921ea1c150405ef952f73952f37fa2746168d8 and follows:

/*
 * ERC20 interface
 * see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 {
  uint public totalSupply;
  function balanceOf(address who) constant returns (uint);
  function allowance(address owner, address spender) constant returns (uint);

  function transfer(address to, uint value) returns (bool ok);
  function transferFrom(address from, address to, uint value) returns (bool ok);
  function approve(address spender, uint value) returns (bool ok);
  event Transfer(address indexed from, address indexed to, uint value);
  event Approval(address indexed owner, address indexed spender, uint value);
}



/**
 * Math operations with safety checks
 */
contract SafeMath {
  function safeMul(uint a, uint b) internal returns (uint) {
    uint c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function safeDiv(uint a, uint b) internal returns (uint) {
    assert(b > 0);
    uint c = a / b;
    assert(a == b * c + a % b);
    return c;
  }

  function safeSub(uint a, uint b) internal returns (uint) {
    assert(b <= a);
    return a - b;
  }

  function safeAdd(uint a, uint b) internal returns (uint) {
    uint c = a + b;
    assert(c>=a && c>=b);
    return c;
  }

  function max64(uint64 a, uint64 b) internal constant returns (uint64) {
    return a >= b ? a : b;
  }

  function min64(uint64 a, uint64 b) internal constant returns (uint64) {
    return a < b ? a : b;
  }

  function max256(uint256 a, uint256 b) internal constant returns (uint256) {
    return a >= b ? a : b;
  }

  function min256(uint256 a, uint256 b) internal constant returns (uint256) {
    return a < b ? a : b;
  }

  function assert(bool assertion) internal {
    if (!assertion) {
      throw;
    }
  }
}



/**
 * Standard ERC20 token
 *
 * https://github.com/ethereum/EIPs/issues/20
 * Based on code by FirstBlood:
 * https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is ERC20, SafeMath {

  mapping(address => uint) balances;
  mapping (address => mapping (address => uint)) allowed;

  function transfer(address _to, uint _value) returns (bool success) {
    balances[msg.sender] = safeSub(balances[msg.sender], _value);
    balances[_to] = safeAdd(balances[_to], _value);
    Transfer(msg.sender, _to, _value);
    return true;
  }

  function transferFrom(address _from, address _to, uint _value) returns (bool success) {
    var _allowance = allowed[_from][msg.sender];

    // Check is not needed because safeSub(_allowance, _value) will already throw if this condition is not met
    // if (_value > _allowance) throw;

    balances[_to] = safeAdd(balances[_to], _value);
    balances[_from] = safeSub(balances[_from], _value);
    allowed[_from][msg.sender] = safeSub(_allowance, _value);
    Transfer(_from, _to, _value);
    return true;
  }

  function balanceOf(address _owner) constant returns (uint balance) {
    return balances[_owner];
  }

  function approve(address _spender, uint _value) returns (bool success) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  function allowance(address _owner, address _spender) constant returns (uint remaining) {
    return allowed[_owner][_spender];
  }

}





/**
 * Upgrade agent interface inspired by Lunyr.
 *
 * Upgrade agent transfers tokens to a new contract.
 * Upgrade agent itself can be the token contract, or just a middle man contract doing the heavy lifting.
 */
contract UpgradeAgent {

  uint public originalSupply;

  /** Interface marker */
  function isUpgradeAgent() public constant returns (bool) {
    return true;
  }

  function upgradeFrom(address _from, uint256 _value) public;

}


/**
 * Safe unsigned safe math.
 *
 * https://blog.aragon.one/library-driven-development-in-solidity-2bebcaf88736#.750gwtwli
 *
 * Originally from https://raw.githubusercontent.com/AragonOne/zeppelin-solidity/master/contracts/SafeMathLib.sol
 *
 * Maintained here until merged to mainline zeppelin-solidity.
 *
 */
library SafeMathLib {

  function times(uint a, uint b) returns (uint) {
    uint c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function minus(uint a, uint b) returns (uint) {
    assert(b <= a);
    return a - b;
  }

  function plus(uint a, uint b) returns (uint) {
    uint c = a + b;
    assert(c>=a && c>=b);
    return c;
  }

  function assert(bool assertion) private {
    if (!assertion) throw;
  }
}


/**
 * A token upgrade mechanism where users can opt-in amount of tokens to the next smart contract revision.
 *
 * First envisioned by Golem and Lunyr projects.
 */
contract UpgradeableToken is StandardToken {

  using SafeMathLib for uint;

  /** Contract / person who can set the upgrade path. This can be the same as team multisig wallet, as what it is with its default value. */
  address public upgradeMaster;

  /** The next contract where the tokens will be migrated. */
  UpgradeAgent public upgradeAgent;

  /** How many tokens we have upgraded by now. */
  uint256 public totalUpgraded;

  /**
   * Upgrade states.
   *
   * - NotAllowed: The child contract has not reached a condition where the upgrade can bgun
   * - WaitingForAgent: Token allows upgrade, but we don't have a new agent yet
   * - ReadyToUpgrade: The agent is set, but not a single token has been upgraded yet
   * - Upgrading: Upgrade agent is set and the balance holders can upgrade their tokens
   *
   */
  enum UpgradeState {Unknown, NotAllowed, WaitingForAgent, ReadyToUpgrade, Upgrading}

  event Upgrade(address indexed _from, address indexed _to, uint256 _value);
  event UpgradeAgentSet(address agent);

  /**
   * Do not allow construction without upgrade master set.
   */
  function UpgradeAgentEnabledToken(address _upgradeMaster) {
    upgradeMaster = _upgradeMaster;
  }

  /**
   * Allow the token holder to upgrade some of their tokens to a new contract.
   */
  function upgrade(uint256 value) public {

      UpgradeState state = getUpgradeState();
      if(!(state == UpgradeState.ReadyToUpgrade || state == UpgradeState.Upgrading)) {
        // Called in a bad state
        throw;
      }

      // Validate input value.
      if (value == 0) throw;

      balances[msg.sender] = balances[msg.sender].minus(value);

      // Take tokens out from circulation
      totalSupply = totalSupply.minus(value);
      totalUpgraded = totalUpgraded.plus(value);

      // Upgrade agent reissues the tokens
      upgradeAgent.upgradeFrom(msg.sender, value);
      Upgrade(msg.sender, upgradeAgent, value);
  }

  /**
   * Set an upgrade agent that handles
   */
  function setUpgradeAgent(address agent) external {

      if(!canUpgrade()) {
        // The token is not yet in a state that we could think upgrading
        throw;
      }

      if (agent == 0x0) throw;
      // Only a master can designate the next agent
      if (msg.sender != upgradeMaster) throw;
      // Upgrade has already begun for an agent
      if (getUpgradeState() == UpgradeState.Upgrading) throw;

      upgradeAgent = UpgradeAgent(agent);

      // Bad interface
      if(!upgradeAgent.isUpgradeAgent()) throw;

      // Make sure that token supplies match in source and target
      if (upgradeAgent.originalSupply() != totalSupply) throw;

      UpgradeAgentSet(upgradeAgent);
  }

  /**
   * Get the state of the token upgrade.
   */
  function getUpgradeState() public constant returns(UpgradeState) {
    if(!canUpgrade()) return UpgradeState.NotAllowed;
    else if(address(upgradeAgent) == 0x00) return UpgradeState.WaitingForAgent;
    else if(totalUpgraded == 0) return UpgradeState.ReadyToUpgrade;
    else return UpgradeState.Upgrading;
  }

  /**
   * Change the upgrade master.
   *
   * This allows us to set a new owner for the upgrade mechanism.
   */
  function setUpgradeMaster(address master) external {
      if (master == 0x0) throw;
      if (msg.sender != upgradeMaster) throw;
      upgradeMaster = master;
  }

  /**
   * Child contract can enable to provide the condition when the upgrade can begun.
   */
  function canUpgrade() public constant returns(bool) {
     return true;
  }

}




/*
 * Ownable
 *
 * Base contract with an owner.
 * Provides onlyOwner modifier, which prevents function from running if it is called by anyone other than the owner.
 */
contract Ownable {
  address public owner;

  function Ownable() {
    owner = msg.sender;
  }

  modifier onlyOwner() {
    if (msg.sender != owner) {
      throw;
    }
    _;
  }

  function transferOwnership(address newOwner) onlyOwner {
    if (newOwner != address(0)) {
      owner = newOwner;
    }
  }

}




/*

TransferableToken defines the generic interface and the implementation
to limit token transferability for different events.

It is intended to be used as a base class for other token contracts.

Over-writting transferableTokens(address holder, uint64 time) is the way to provide
the specific logic for limitting token transferability for a holder over time.

TransferableToken has been designed to allow for different limitting factors,
this can be achieved by recursively calling super.transferableTokens() until the
base class is hit. For example:

function transferableTokens(address holder, uint64 time) constant public returns (uint256) {
  return min256(unlockedTokens, super.transferableTokens(holder, time));
}

A working example is VestedToken.sol:
https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/token/VestedToken.sol

*/

contract TransferableToken is ERC20 {
  // Checks whether it can transfer or otherwise throws.
  modifier canTransfer(address _sender, uint _value) {
   if (_value > transferableTokens(_sender, uint64(now))) throw;
   _;
  }

  // Checks modifier and allows transfer if tokens are not locked.
  function transfer(address _to, uint _value) canTransfer(msg.sender, _value) returns (bool success) {
   return super.transfer(_to, _value);
  }

  // Checks modifier and allows transfer if tokens are not locked.
  function transferFrom(address _from, address _to, uint _value) canTransfer(_from, _value) returns (bool success) {
   return super.transferFrom(_from, _to, _value);
  }

  // Default transferable tokens function returns all tokens for a holder (no limit).
  function transferableTokens(address holder, uint64 time) constant public returns (uint256) {
    return balanceOf(holder);
  }
}




/**
 * Define interface for releasing the token transfer after a successful crowdsale.
 */
contract ReleasableToken is ERC20, Ownable {

  /* The finalizer contract that allows unlift the transfer limits on this token */
  address public releaseAgent;

  /** A crowdsale contract can release us to the wild if ICO success. If false we are are in transfer lock up period.*/
  bool public released = false;

  /** Map of agents that are allowed to transfer tokens regardless of the lock down period. These are crowdsale contracts and possible the team multisig itself. */
  mapping (address => bool) public transferAgents;

  /**
   * Limit token transfer until the crowdsale is over.
   *
   */
  modifier canTransfer(address _sender) {

    if(!released) {
        if(!transferAgents[_sender]) {
            throw;
        }
    }

    _;
  }

  /**
   * Set the contract that can call release and make the token transferable.
   */
  function setReleaseAgent(address addr) onlyOwner inReleaseState(false) public {

    // Already set
    if(releaseAgent != 0) {
      throw;
    }

    // We don't do interface check here as we might want to a normal wallet address to act as a release agent
    releaseAgent = addr;
  }

  /**
   * Owner can allow a particular address (a crowdsale contract) to transfer tokens despite the lock up period.
   */
  function setTransferAgent(address addr, bool state) onlyOwner inReleaseState(false) public {
    transferAgents[addr] = state;
  }

  /**
   * One way function to release the tokens to the wild.
   *
   * Can be called only from the release agent that is the final ICO contract. It is only called if the crowdsale has been success (first milestone reached).
   */
  function releaseTokenTransfer() public onlyReleaseAgent {
    released = true;
  }

  /** The function can be called only before or after the tokens have been releasesd */
  modifier inReleaseState(bool releaseState) {
    if(releaseState != released) {
        throw;
    }
    _;
  }

  /** The function can be called only by a whitelisted release agent. */
  modifier onlyReleaseAgent() {
    if(msg.sender != releaseAgent) {
        throw;
    }
    _;
  }

  function transfer(address _to, uint _value) canTransfer(msg.sender) returns (bool success) {
    // Call StandardToken.transfer()
   return super.transfer(_to, _value);
  }

  function transferFrom(address _from, address _to, uint _value) canTransfer(_from) returns (bool success) {
    // Call StandardToken.transferForm()
    return super.transferFrom(_from, _to, _value);
  }

}







/**
 * A token that can increase its supply by another contract.
 *
 * This allows uncapped crowdsale by dynamically increasing the supply when money pours in.
 * Only mint agents, contracts whitelisted by owner, can mint new tokens.
 *
 */
contract MintableToken is StandardToken, Ownable {

  using SafeMathLib for uint;

  bool public mintingFinished = false;

  /** List of agents that are allowed to create new tokens */
  mapping (address => bool) public mintAgents;

  /**
   * Create new tokens and allocate them to an address..
   *
   * Only callably by a crowdsale contract (mint agent).
   */
  function mint(address receiver, uint amount) onlyMintAgent canMint public {
    totalSupply = totalSupply.plus(amount);
    balances[receiver] = balances[receiver].plus(amount);
    Transfer(0, receiver, amount);
  }

  /**
   * Owner can allow a crowdsale contract to mint new tokens.
   */
  function setMintAgent(address addr, bool state) onlyOwner canMint public {
    mintAgents[addr] = state;
  }

  modifier onlyMintAgent() {
    // Only crowdsale contracts are allowed to mint new tokens
    if(!mintAgents[msg.sender]) {
        throw;
    }
    _;
  }

  /** Make sure we are not done yet. */
  modifier canMint() {
    if(mintingFinished) throw;
    _;
  }
}




/**
 * A crowdsaled token.
 *
 * An ERC-20 token designed specifically for crowdsales with investor protection and further development path.
 *
 * - The token transfer() is disabled until the crowdsale is over
 * - The token contract gives an opt-in upgrade path to a new contract
 * - The same token can be part of several crowdsales through approve() mechanism
 * - The token can be capped (supply set in the constructor) or uncapped (crowdsale contract can mint new tokens)
 *
 */
contract CrowdsaleToken is ReleasableToken, MintableToken, UpgradeableToken {

  string public name;

  string public symbol;

  /** We don't want to support decimal places as it's not very well handled by different wallets */
  uint public decimals = 0;

  /**
   * Construct the token.
   *
   * This token must be created through a team multisig wallet, so that it is owned by that wallet.
   */
  function CrowdsaleToken(string _name, string _symbol, uint _initialSupply) {

    // Create from team multisig
    owner = msg.sender;

    // Initially set the upgrade master same as owner
    upgradeMaster = owner;

    name = _name;
    symbol = _symbol;

    totalSupply = _initialSupply;

    // Create initially all balance on the team multisig
    balances[msg.sender] = totalSupply;
  }

  /**
   * When token is released to be transferable, enforce no new tokens can be created.
   */
  function releaseTokenTransfer() public onlyReleaseAgent {
    mintingFinished = true;
    super.releaseTokenTransfer();
  }

  /**
   * Allow upgrade agent functionality kick in only if the crowdsale was success.
   */
  function canUpgrade() public constant returns(bool) {
    return released;
  }

}
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