{
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          "type": "address"
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          "type": "address"
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      "inputs": [],
      "name": "name",
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      "inputs": [],
      "name": "symbol",
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      "constant": true
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    {
      "inputs": [],
      "name": "totalSupply",
      "outputs": [
        {
          "internalType": "uint256",
          "name": "",
          "type": "uint256"
        }
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      "stateMutability": "view",
      "type": "function",
      "constant": true
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    {
      "inputs": [
        {
          "internalType": "address",
          "name": "_to",
          "type": "address"
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        {
          "internalType": "uint256",
          "name": "_value",
          "type": "uint256"
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      "name": "transfer",
      "outputs": [
        {
          "internalType": "bool",
          "name": "",
          "type": "bool"
        }
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      "stateMutability": "nonpayable",
      "type": "function"
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    {
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          "internalType": "address",
          "name": "_from",
          "type": "address"
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        {
          "internalType": "address",
          "name": "_to",
          "type": "address"
        },
        {
          "internalType": "uint256",
          "name": "_value",
          "type": "uint256"
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      "name": "transferFrom",
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          "name": "",
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    {
      "inputs": [
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          "internalType": "address",
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        {
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          "name": "_value",
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      "name": "approve",
      "outputs": [
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          "name": "",
          "type": "bool"
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once to change the allowance to 0 and secondly to change it to the new allowance value\",\"params\":{\"_spender\":\"approved address\",\"_value\":\"allowance amount\"},\"returns\":{\"_0\":\"true if the approval was successful, false if it wasn't\"}},\"constructor\":{\"details\":\"initializes a new ERC20Token instance\",\"params\":{\"_decimals\":\"decimal points, for display purposes\",\"_name\":\"token name\",\"_symbol\":\"token symbol\",\"_totalSupply\":\"total supply of token units\"}},\"transfer(address,uint256)\":{\"details\":\"transfers tokens to a given address throws on any error rather then return a false flag to minimize user errors\",\"params\":{\"_to\":\"target address\",\"_value\":\"transfer amount\"},\"returns\":{\"_0\":\"true if the transfer was successful, false if it wasn't\"}},\"transferFrom(address,address,uint256)\":{\"details\":\"transfers tokens to a given address on behalf of another address throws on any error rather then return a false flag to minimize user errors\",\"params\":{\"_from\":\"source address\",\"_to\":\"target address\",\"_value\":\"transfer amount\"},\"returns\":{\"_0\":\"true if the transfer was successful, false if it wasn't\"}}},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/token/ERC20Token.sol\":\"ERC20Token\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/token/ERC20Token.sol\":{\"keccak256\":\"0xf64a993754bb4afcdfda9e8fe377c2c8a198f23b39e954f5ee3f9f2825958ebd\",\"license\":\"SEE LICENSE IN LICENSE\",\"urls\":[\"bzz-raw://9ee0b7fd792a589b8321f1f13686fe5d5ae949288b124c1a57e2ad895c87e915\",\"dweb:/ipfs/QmTCRx2G6rJAhX9FyYkV4Gx69owVDYSkjNGNFrJGQ7Xnik\"]},\"/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/token/interfaces/IERC20Token.sol\":{\"keccak256\":\"0xe6f988c3156e88258474526a541d5a42b6a9adae98b04177a059d9f723bc82cd\",\"license\":\"SEE LICENSE IN LICENSE\",\"urls\":[\"bzz-raw://9a6eb77a5b9ce70995a11a6e48ac3985a4c70896fe5fe04d46146ad7c1c83ea3\",\"dweb:/ipfs/QmYvGSveZFG51tghwkVuu6eK9Jy8frHpfLxHTMyvNZN461\"]},\"/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/utility/SafeMath.sol\":{\"keccak256\":\"0x1ab7391a19ca8a3ad2f3c4a1074e080d4d76dfdb834637bdd0c1e6b6acdf28af\",\"license\":\"SEE LICENSE IN LICENSE\",\"urls\":[\"bzz-raw://d6d8c99621ca884b72da2d84eddfec8ec8c5533915691d6eec94a07adf445608\",\"dweb:/ipfs/QmaXr6DN7VbfxfMn3PsTy7SAMgZVVXbdeaw11BsAjVL2x1\"]},\"/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/utility/Utils.sol\":{\"keccak256\":\"0x073efa69fcd6b5e60f841b28b366d63b62ff48ab12a06ce3f5a7f41afd6ce885\",\"license\":\"SEE LICENSE IN LICENSE\",\"urls\":[\"bzz-raw://e8b8ecb2d29197ca77f0ed98f728ace54e6edcfdf5cd1194ae22701607eaf608\",\"dweb:/ipfs/QmcsR6Q35Hurh3TrPkYAboicz9bQQoGCWmZLzUCDyhotH8\"]}},\"version\":1}",
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  "source": "// SPDX-License-Identifier: SEE LICENSE IN LICENSE\r\npragma solidity 0.6.12;\r\nimport \"./interfaces/IERC20Token.sol\";\r\nimport \"../utility/Utils.sol\";\r\nimport \"../utility/SafeMath.sol\";\r\n\r\n/**\r\n  * @dev ERC20 Standard Token implementation\r\n*/\r\ncontract ERC20Token is IERC20Token, Utils {\r\n    using SafeMath for uint256;\r\n\r\n\r\n    string public override name;\r\n    string public override symbol;\r\n    uint8 public override decimals;\r\n    uint256 public override totalSupply;\r\n    mapping (address => uint256) public override balanceOf;\r\n    mapping (address => mapping (address => uint256)) public override allowance;\r\n\r\n    /**\r\n      * @dev triggered when tokens are transferred between wallets\r\n      *\r\n      * @param _from    source address\r\n      * @param _to      target address\r\n      * @param _value   transfer amount\r\n    */\r\n    event Transfer(address indexed _from, address indexed _to, uint256 _value);\r\n\r\n    /**\r\n      * @dev triggered when a wallet allows another wallet to transfer tokens from on its behalf\r\n      *\r\n      * @param _owner   wallet that approves the allowance\r\n      * @param _spender wallet that receives the allowance\r\n      * @param _value   allowance amount\r\n    */\r\n    event Approval(address indexed _owner, address indexed _spender, uint256 _value);\r\n\r\n    /**\r\n      * @dev initializes a new ERC20Token instance\r\n      *\r\n      * @param _name        token name\r\n      * @param _symbol      token symbol\r\n      * @param _decimals    decimal points, for display purposes\r\n      * @param _totalSupply total supply of token units\r\n    */\r\n    constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _totalSupply) public {\r\n        // validate input\r\n        require(bytes(_name).length > 0, \"ERR_INVALID_NAME\");\r\n        require(bytes(_symbol).length > 0, \"ERR_INVALID_SYMBOL\");\r\n\r\n        name = _name;\r\n        symbol = _symbol;\r\n        decimals = _decimals;\r\n        totalSupply = _totalSupply;\r\n        balanceOf[msg.sender] = _totalSupply;\r\n    }\r\n\r\n    /**\r\n      * @dev transfers tokens to a given address\r\n      * throws on any error rather then return a false flag to minimize user errors\r\n      *\r\n      * @param _to      target address\r\n      * @param _value   transfer amount\r\n      *\r\n      * @return true if the transfer was successful, false if it wasn't\r\n    */\r\n    function transfer(address _to, uint256 _value)\r\n        public\r\n        virtual\r\n        override\r\n        validAddress(_to)\r\n        returns (bool)\r\n    {\r\n        balanceOf[msg.sender] = balanceOf[msg.sender].sub(_value);\r\n        balanceOf[_to] = balanceOf[_to].add(_value);\r\n        emit Transfer(msg.sender, _to, _value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n      * @dev transfers tokens to a given address on behalf of another address\r\n      * throws on any error rather then return a false flag to minimize user errors\r\n      *\r\n      * @param _from    source address\r\n      * @param _to      target address\r\n      * @param _value   transfer amount\r\n      *\r\n      * @return true if the transfer was successful, false if it wasn't\r\n    */\r\n    function transferFrom(address _from, address _to, uint256 _value)\r\n        public\r\n        virtual\r\n        override\r\n        validAddress(_from)\r\n        validAddress(_to)\r\n        returns (bool)\r\n    {\r\n        allowance[_from][msg.sender] = allowance[_from][msg.sender].sub(_value);\r\n        balanceOf[_from] = balanceOf[_from].sub(_value);\r\n        balanceOf[_to] = balanceOf[_to].add(_value);\r\n        emit Transfer(_from, _to, _value);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n      * @dev allows another account/contract to transfers tokens on behalf of the caller\r\n      * throws on any error rather then return a false flag to minimize user errors\r\n      *\r\n      * also, to minimize the risk of the approve/transferFrom attack vector\r\n      * (see https://docs.google.com/document/d/1YLPtQxZu1UAvO9cZ1O2RPXBbT0mooh4DYKjA_jp-RLM/), approve has to be called twice\r\n      * in 2 separate transactions - once to change the allowance to 0 and secondly to change it to the new allowance value\r\n      *\r\n      * @param _spender approved address\r\n      * @param _value   allowance amount\r\n      *\r\n      * @return true if the approval was successful, false if it wasn't\r\n    */\r\n    function approve(address _spender, uint256 _value)\r\n        public\r\n        virtual\r\n        override\r\n        validAddress(_spender)\r\n        returns (bool)\r\n    {\r\n        // if the allowance isn't 0, it can only be updated to 0 to prevent an allowance change immediately after withdrawal\r\n        require(_value == 0 || allowance[msg.sender][_spender] == 0, \"ERR_INVALID_AMOUNT\");\r\n\r\n        allowance[msg.sender][_spender] = _value;\r\n        emit Approval(msg.sender, _spender, _value);\r\n        return true;\r\n    }\r\n}\r\n",
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              "text": " @dev allows another account/contract to transfers tokens on behalf of the caller\n throws on any error rather then return a false flag to minimize user errors\n also, to minimize the risk of the approve/transferFrom attack vector\n (see https://docs.google.com/document/d/1YLPtQxZu1UAvO9cZ1O2RPXBbT0mooh4DYKjA_jp-RLM/), approve has to be called twice\n in 2 separate transactions - once to change the allowance to 0 and secondly to change it to the new allowance value\n @param _spender approved address\n @param _value   allowance amount\n @return true if the approval was successful, false if it wasn't"
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    "src": "52:4756:48"
  },
  "compiler": {
    "name": "solc",
    "version": "0.6.12+commit.27d51765.Emscripten.clang"
  },
  "networks": {},
  "schemaVersion": "3.2.3",
  "updatedAt": "2020-11-10T14:20:44.727Z",
  "networkType": "ethereum",
  "devdoc": {
    "details": "ERC20 Standard Token implementation",
    "events": {
      "Approval(address,address,uint256)": {
        "details": "triggered when a wallet allows another wallet to transfer tokens from on its behalf",
        "params": {
          "_owner": "wallet that approves the allowance",
          "_spender": "wallet that receives the allowance",
          "_value": "allowance amount"
        }
      },
      "Transfer(address,address,uint256)": {
        "details": "triggered when tokens are transferred between wallets",
        "params": {
          "_from": "source address",
          "_to": "target address",
          "_value": "transfer amount"
        }
      }
    },
    "kind": "dev",
    "methods": {
      "approve(address,uint256)": {
        "details": "allows another account/contract to transfers tokens on behalf of the caller throws on any error rather then return a false flag to minimize user errors also, to minimize the risk of the approve/transferFrom attack vector (see https://docs.google.com/document/d/1YLPtQxZu1UAvO9cZ1O2RPXBbT0mooh4DYKjA_jp-RLM/), approve has to be called twice in 2 separate transactions - once to change the allowance to 0 and secondly to change it to the new allowance value",
        "params": {
          "_spender": "approved address",
          "_value": "allowance amount"
        },
        "returns": {
          "_0": "true if the approval was successful, false if it wasn't"
        }
      },
      "constructor": {
        "details": "initializes a new ERC20Token instance",
        "params": {
          "_decimals": "decimal points, for display purposes",
          "_name": "token name",
          "_symbol": "token symbol",
          "_totalSupply": "total supply of token units"
        }
      },
      "transfer(address,uint256)": {
        "details": "transfers tokens to a given address throws on any error rather then return a false flag to minimize user errors",
        "params": {
          "_to": "target address",
          "_value": "transfer amount"
        },
        "returns": {
          "_0": "true if the transfer was successful, false if it wasn't"
        }
      },
      "transferFrom(address,address,uint256)": {
        "details": "transfers tokens to a given address on behalf of another address throws on any error rather then return a false flag to minimize user errors",
        "params": {
          "_from": "source address",
          "_to": "target address",
          "_value": "transfer amount"
        },
        "returns": {
          "_0": "true if the transfer was successful, false if it wasn't"
        }
      }
    },
    "version": 1
  },
  "userdoc": {
    "kind": "user",
    "methods": {},
    "version": 1
  }
}