Contract Source Code (Solidity)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta
• Remix IDE

Outline

interface IERC20    - function transfer(address to, uint256 ...    - function approve(address spender, uin ...    - function transferFrom(address from, a ...    - function totalSupply()    - function balanceOf(address who)    - function allowance(address owner, add ... library SafeMath    - function mul(uint256 a, uint256 b)    - function div(uint256 a, uint256 b)    - function sub(uint256 a, uint256 b)    - function add(uint256 a, uint256 b)    - function mod(uint256 a, uint256 b)  contract Akoya is IERC20 *    - function totalSupply()    - function balanceOf(address owner)    - function allowance(address owner, add ...    - function transfer(address to, uint256 ...    - function approve(address spender, uin ...    - function transferFrom(address from, a ...    - function increaseAllowance(address sp ...    - function decreaseAllowance(address sp ...    - function burn(uint256 value)    - function burnFrom(address from, uint2 ...    - function _transfer(address from, addr ...    - function _burn(address account, uint2 ...    - function _approve(address owner, addr ...    - function _burnFrom(address account, u ...    - function ()

More Options

• Similar
• Sol2Uml
• Submit Audit
• Compare

/**
 *Submitted for verification at Etherscan.io on 2019-04-22
*/

pragma solidity ^0.5.7;

/**
 * @title oyster.org | Bandwidth Bound Consensus
 * @dev https://github.com/brunoblock/oystermesh
 * @dev [email protected]
 * 
 * 1 AKYE == 1 AKY
 * 
 * ERC-20 Source: https://github.com/OpenZeppelin/openzeppelin-solidity/tree/master/contracts/token/ERC20
 * 
 * @dev see https://eips.ethereum.org/EIPS/eip-20
 *
 */
interface IERC20 {
    function transfer(address to, uint256 value) external returns (bool);

    function approve(address spender, uint256 value) external returns (bool);

    function transferFrom(address from, address to, uint256 value) external returns (bool);

    function totalSupply() external view returns (uint256);

    function balanceOf(address who) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);
    
    event Burn(address indexed from, uint256 value);
}

library SafeMath {
    /**
     * @dev Multiplies two unsigned integers, reverts on overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b);

        return c;
    }

    /**
     * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Adds two unsigned integers, reverts on overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);

        return c;
    }

    /**
     * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
     * reverts when dividing by zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0);
        return a % b;
    }
}

contract Akoya is IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowed;

    string public name;
    string public symbol;
    uint8 public decimals;
    uint256 private _totalSupply;
    
    constructor() public {
        name = "Oyster Akoya";
        symbol = "AKYE";
        decimals = 18;
        _totalSupply = 10000000 * 10 ** uint256(decimals);
        
        // Assign entire AKYE supply to the contract creator
        _balances[msg.sender] = _totalSupply;
    }

    /**
     * @dev Total number of tokens in existence.
     */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev Gets the balance of the specified address.
     * @param owner The address to query the balance of.
     * @return A uint256 representing the amount owned by the passed address.
     */
    function balanceOf(address owner) public view returns (uint256) {
        return _balances[owner];
    }

    /**
     * @dev Function to check the amount of tokens that an owner allowed to a spender.
     * @param owner address The address which owns the funds.
     * @param spender address The address which will spend the funds.
     * @return A uint256 specifying the amount of tokens still available for the spender.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowed[owner][spender];
    }

    /**
     * @dev Transfer token to a specified address.
     * @param to The address to transfer to.
     * @param value The amount to be transferred.
     */
    function transfer(address to, uint256 value) public returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    /**
     * @dev Approve the passed address to spend the specified amount 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 value The amount of tokens to be spent.
     */
    function approve(address spender, uint256 value) public returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    /**
     * @dev Transfer tokens from one address to another.
     * Note that while this function emits an Approval event, this is not required as per the specification,
     * and other compliant implementations may not emit the event.
     * @param from address The address which you want to send tokens from
     * @param to address The address which you want to transfer to
     * @param value uint256 the amount of tokens to be transferred
     */
    function transferFrom(address from, address to, uint256 value) public returns (bool) {
        _transfer(from, to, value);
        _approve(from, msg.sender, _allowed[from][msg.sender].sub(value));
        return true;
    }

    /**
     * @dev Increase the amount of tokens that an owner allowed to a spender.
     * approve should be called when _allowed[msg.sender][spender] == 0. To increment
     * allowed value is better to use this function to avoid 2 calls (and wait until
     * the first transaction is mined)
     * From MonolithDAO Token.sol
     * Emits an Approval event.
     * @param spender The address which will spend the funds.
     * @param addedValue The amount of tokens to increase the allowance by.
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(msg.sender, spender, _allowed[msg.sender][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Decrease the amount of tokens that an owner allowed to a spender.
     * approve should be called when _allowed[msg.sender][spender] == 0. To decrement
     * allowed value is better to use this function to avoid 2 calls (and wait until
     * the first transaction is mined)
     * From MonolithDAO Token.sol
     * Emits an Approval event.
     * @param spender The address which will spend the funds.
     * @param subtractedValue The amount of tokens to decrease the allowance by.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        _approve(msg.sender, spender, _allowed[msg.sender][spender].sub(subtractedValue));
        return true;
    }
    
     /**
     * @dev Burns a specific amount of tokens.
     * @param value The amount of token to be burned.
     */
    function burn(uint256 value) public {
        _burn(msg.sender, value);
    }

    /**
     * @dev Burns a specific amount of tokens from the target address and decrements allowance.
     * @param from address The account whose tokens will be burned.
     * @param value uint256 The amount of token to be burned.
     */
    function burnFrom(address from, uint256 value) public {
        _burnFrom(from, value);
    }

    /**
     * @dev Transfer token for a specified addresses.
     * @param from The address to transfer from.
     * @param to The address to transfer to.
     * @param value The amount to be transferred.
     */
    function _transfer(address from, address to, uint256 value) internal {
        require(to != address(0));

        _balances[from] = _balances[from].sub(value);
        _balances[to] = _balances[to].add(value);
        emit Transfer(from, to, value);
    }

    /**
     * @dev Internal function that burns an amount of the token of a given
     * account.
     * @param account The account whose tokens will be burnt.
     * @param value The amount that will be burnt.
     */
    function _burn(address account, uint256 value) internal {
        require(account != address(0));

        _totalSupply = _totalSupply.sub(value);
        _balances[account] = _balances[account].sub(value);
        emit Transfer(account, address(0), value);
        emit Burn(account, value);
    }

    /**
     * @dev Approve an address to spend another addresses' tokens.
     * @param owner The address that owns the tokens.
     * @param spender The address that will spend the tokens.
     * @param value The number of tokens that can be spent.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        require(spender != address(0));
        require(owner != address(0));

        _allowed[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    /**
     * @dev Internal function that burns an amount of the token of a given
     * account, deducting from the sender's allowance for said account. Uses the
     * internal burn function.
     * Emits an Approval event (reflecting the reduced allowance).
     * @param account The account whose tokens will be burnt.
     * @param value The amount that will be burnt.
     */
    function _burnFrom(address account, uint256 value) internal {
        _burn(account, value);
        _approve(account, msg.sender, _allowed[account][msg.sender].sub(value));
    }
    
    // Rejects ETH deposits
    function () external payable {
        revert();
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"spender","type":"address"},{"name":"value","type":"uint256"}],"name":"approve","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","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,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"spender","type":"address"},{"name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"value","type":"uint256"}],"name":"burn","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"from","type":"address"},{"name":"value","type":"uint256"}],"name":"burnFrom","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"spender","type":"address"},{"name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"value","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"owner","type":"address"},{"name":"spender","type":"address"}],"name":"allowance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"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"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Burn","type":"event"}]

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

bzzr://ab053c90e32961ea0764a24b66d635a72d2f01f43b18199e6a7c306f6a2485ad