为了庆祝Oasis-Eth ParaTime在Oasis网络的正式上线, 官方发起了黑客马拉松活动. 活动链接: https://oasisprotocol.org/ch-oasis-eth-hackathon

这里写一下挑战1的攻略

挑战#1: 构建和部署一个ERC20代币合约(50 ROSE, .5 OETH)

获取钱包地址

进入智能合约开发的Web端网站:http://oasiseth.org/dev

点击左下角钢笔的图形,复制显示的第一个钱包地址:

image.png

通过水龙头网站获得测试币

进入水龙头网站: http://faucet.oasiseth.org/ 输入上一步复制的钱包地址获得0.01 OETH测试币

image.png

创建ERC-20代币

如果你知道怎么写ERC-20代币的合约,直接跳过这一步。

如果你不知道怎么写合约,复制下面的代码到智能合约开发的Web端网站,修改一下代币的名字和代号就好了。比如我的代币的名字是Shop token,代号是SHOP

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pragma solidity ^0.4.0;

contract ERC20 {

string public constant name = "代币的名字";
string public constant symbol = "代币的代号";
uint8 public constant decimals = 0;


event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
event Transfer(address indexed from, address indexed to, uint tokens);


mapping(address => uint256) balances;

mapping(address => mapping (address => uint256)) allowed;

uint256 totalSupply_;

using SafeMath for uint256;


constructor(uint256 total) public {
totalSupply_ = total;
balances[msg.sender] = totalSupply_;
}

function totalSupply() public view returns (uint256) {
return totalSupply_;
}

function balanceOf(address tokenOwner) public view returns (uint) {
return balances[tokenOwner];
}

function transfer(address receiver, uint numTokens) public returns (bool) {
require(numTokens <= balances[msg.sender]);
balances[msg.sender] = balances[msg.sender].sub(numTokens);
balances[receiver] = balances[receiver].add(numTokens);
emit Transfer(msg.sender, receiver, numTokens);
return true;
}

function approve(address delegate, uint numTokens) public returns (bool) {
allowed[msg.sender][delegate] = numTokens;
emit Approval(msg.sender, delegate, numTokens);
return true;
}

function allowance(address owner, address delegate) public view returns (uint) {
return allowed[owner][delegate];
}

function transferFrom(address owner, address buyer, uint numTokens) public returns (bool) {
require(numTokens <= balances[owner]);
require(numTokens <= allowed[owner][msg.sender]);

balances[owner] = balances[owner].sub(numTokens);
allowed[owner][msg.sender] = allowed[owner][msg.sender].sub(numTokens);
balances[buyer] = balances[buyer].add(numTokens);
emit Transfer(owner, buyer, numTokens);
return true;
}
}

library SafeMath {
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}

function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}

部署合约

合约写好后,点击上方的“Compile”, 选择”ERC20”, 输入代币的总量,最后点击”Deploy to the chain” 按钮。等待合约部署成功

image.png

合约部署成功后,会显示合约的交易id和合约地址。记下合约的地址,填表格的时候需要这个地址

image.png

填表格

弄好合约后,如果你不想继续下面的挑战,可以直接填表格。表格链接:https://oasisprotocol.org/ch-oasis-eth-hackathon

在网站的中间那个位置,点击开始

image.png

第一个挑战就这样完成了。第二个挑战目前网站上不去,等能上去了再出攻略