MyCrowdsale
BokkyPooBah edited this page Oct 3, 2017
·
1 revision
Following is a simple crowdsale contract, deployed to the Ropsten network.
Contract address: 0xa858cc5abf91a7dfcff20ee80859e42d9959df08
I contributed 0.5 ETH to the crowdsale contract in the transaction 0x1c51c1c3 to receive 500 MYT tokens.
Note that I had to specify 150,000 gas as the contribution consumes more than the standard 90,000 gas provided for transactions to contracts. The actual gas used in the contribution transaction was 94,418.
I also had to specify a 105 gwei gasPrice in the deployment and contribution transactions - a leftover from the recent Ropsten network attack.
From MyCrowdsale.sol:
pragma solidity ^0.4.16;
// ----------------------------------------------------------------------------
// MYT 'MyToken' crowdsale/token contract sample contract.
//
// NOTE: Use at your own risk as this contract has not been audited
//
// Deployed to :
// Symbol : MYT
// Name : MyToken
// Total supply: Unlimited
// Decimals : 18
//
// Enjoy.
//
// (c) BokkyPooBah / Bok Consulting Pty Ltd 2017. The MIT Licence.
// ----------------------------------------------------------------------------
// ----------------------------------------------------------------------------
// ERC Token Standard #20 Interface
// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md
// ----------------------------------------------------------------------------
contract ERC20Interface {
uint public totalSupply;
function balanceOf(address account) public constant returns (uint balance);
function transfer(address to, uint value) public returns (bool success);
function transferFrom(address from, address to, uint value)
public returns (bool success);
function approve(address spender, uint value) public returns (bool success);
function allowance(address owner, address spender) public constant
returns (uint remaining);
event Transfer(address indexed from, address indexed to, uint value);
event Approval(address indexed owner, address indexed spender, uint value);
}
// ----------------------------------------------------------------------------
// Owned contract
// ----------------------------------------------------------------------------
contract Owned {
// ------------------------------------------------------------------------
// Current owner, and proposed new owner
// ------------------------------------------------------------------------
address public owner;
address public newOwner;
// ------------------------------------------------------------------------
// Constructor - assign creator as the owner
// ------------------------------------------------------------------------
function Owned() public {
owner = msg.sender;
}
// ------------------------------------------------------------------------
// Modifier to mark that a function can only be executed by the owner
// ------------------------------------------------------------------------
modifier onlyOwner {
require(msg.sender == owner);
_;
}
// ------------------------------------------------------------------------
// Owner can initiate transfer of contract to a new owner
// ------------------------------------------------------------------------
function transferOwnership(address _newOwner) public onlyOwner {
newOwner = _newOwner;
}
// ------------------------------------------------------------------------
// New owner has to accept transfer of contract
// ------------------------------------------------------------------------
function acceptOwnership() public {
require(msg.sender == newOwner);
OwnershipTransferred(owner, newOwner);
owner = newOwner;
newOwner = 0x0;
}
event OwnershipTransferred(address indexed from, address indexed to);
}
// ----------------------------------------------------------------------------
// Safe maths, borrowed from OpenZeppelin
// ----------------------------------------------------------------------------
library SafeMath {
// ------------------------------------------------------------------------
// Add a number to another number, checking for overflows
// ------------------------------------------------------------------------
function add(uint a, uint b) pure internal returns (uint) {
uint c = a + b;
assert(c >= a && c >= b);
return c;
}
// ------------------------------------------------------------------------
// Subtract a number from another number, checking for underflows
// ------------------------------------------------------------------------
function sub(uint a, uint b) pure internal returns (uint) {
assert(b <= a);
return a - b;
}
// ------------------------------------------------------------------------
// Multiply two numbers
// ------------------------------------------------------------------------
function mul(uint a, uint b) pure internal returns (uint) {
uint c = a * b;
assert(a == 0 || c / a == b);
return c;
}
// ------------------------------------------------------------------------
// Multiply one number by another number
// ------------------------------------------------------------------------
function div(uint a, uint b) pure internal returns (uint) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
uint c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
}
// ----------------------------------------------------------------------------
// ERC20 Token, with the addition of symbol, name and decimals
// ----------------------------------------------------------------------------
contract MyToken is ERC20Interface, Owned {
using SafeMath for uint;
// ------------------------------------------------------------------------
// Token parameters
// ------------------------------------------------------------------------
string public constant symbol = "MYT";
string public constant name = "MyToken";
uint8 public constant decimals = 18;
uint public totalSupply = 0;
// ------------------------------------------------------------------------
// Balances for each account
// ------------------------------------------------------------------------
mapping(address => uint) balances;
// ------------------------------------------------------------------------
// Owner of account approves the transfer tokens to another account
// ------------------------------------------------------------------------
mapping(address => mapping (address => uint)) allowed;
// ------------------------------------------------------------------------
// Constructor
// ------------------------------------------------------------------------
function MyToken() public Owned() {
}
// ------------------------------------------------------------------------
// Get the account balance of another account with address account
// ------------------------------------------------------------------------
function balanceOf(address account) public constant returns (uint balance) {
return balances[account];
}
// ------------------------------------------------------------------------
// Transfer the balance from owner's account to another account
// ------------------------------------------------------------------------
function transfer(address to, uint tokens) public returns (bool success) {
balances[msg.sender] = balances[msg.sender].sub(tokens);
balances[to] = balances[to].add(tokens);
Transfer(msg.sender, to, tokens);
return true;
}
// ------------------------------------------------------------------------
// Allow spender to withdraw from your account, multiple times, up to the
// value tokens. If this function is called again it overwrites the
// current allowance with value.
// ------------------------------------------------------------------------
function approve(address spender, uint tokens) public returns (bool success) {
allowed[msg.sender][spender] = tokens;
Approval(msg.sender, spender, tokens);
return true;
}
// ------------------------------------------------------------------------
// Spender of tokens transfer an tokens of tokens from the token owner's
// balance to another account. The owner of the tokens must already
// have approve(...)-d this transfer
// ------------------------------------------------------------------------
function transferFrom(address from, address to, uint tokens) public
returns (bool success)
{
balances[from] = balances[from].sub(tokens);
allowed[from][msg.sender] = allowed[from][msg.sender].sub(tokens);
balances[to] = balances[to].add(tokens);
Transfer(from, to, tokens);
return true;
}
// ------------------------------------------------------------------------
// Returns the number of tokens approved by the owner that can be
// transferred to the spender's account
// ------------------------------------------------------------------------
function allowance(address owner, address spender ) public
constant returns (uint remaining)
{
return allowed[owner][spender];
}
// ------------------------------------------------------------------------
// Mint coins for a single account
// ------------------------------------------------------------------------
function mint(address to, uint tokens) internal {
require(to != 0x0 && tokens != 0);
balances[to] = balances[to].add(tokens);
totalSupply = totalSupply.add(tokens);
Transfer(0x0, to, tokens);
}
// ------------------------------------------------------------------------
// Owner can transfer out any accidentally sent ERC20 tokens
// ------------------------------------------------------------------------
function transferAnyERC20Token(address tokenAddress, uint tokens)
public onlyOwner returns (bool success)
{
return ERC20Interface(tokenAddress).transfer(owner, tokens);
}
}
contract MyCrowdsale is MyToken {
// ------------------------------------------------------------------------
// Start Date
// > new Date('2017-10-03T08:00:00+11:00').getTime()/1000
// 1506978000
// > new Date(1506978000 * 1000).toString()
// "Tue, 03 Oct 2017 08:00:00 AEDT"
// End Date
// Start Date + 2 weeks
// ------------------------------------------------------------------------
uint public constant START_DATE = 1506978000;
uint public constant END_DATE = START_DATE + 2 weeks;
// Hard cap
uint public constant ETH_HARD_CAP = 5 ether;
// Tokens per 1,000 ETH
uint public constant tokensPerKEther = 1000000;
// Keep track of ETH raised
uint public ethersRaised;
// Crowdsale finalised?
bool public finalised;
// Tokens transferable?
bool public transferable;
// My coffer
address public wallet;
// ------------------------------------------------------------------------
// Constructor
// ------------------------------------------------------------------------
function MyCrowdsale() public MyToken() {
wallet = msg.sender;
}
// ------------------------------------------------------------------------
// Add precommitment funding token balance and ether cost before the
// crowdsale commences
// ------------------------------------------------------------------------
function addPrecommitment(address participant, uint tokens, uint ethers) public onlyOwner {
// Can only add precommitments before the crowdsale starts
require(block.timestamp < START_DATE);
// Check tokens > 0
require(tokens > 0);
// Mint tokens
mint(participant, tokens);
// Keep track of ethers raised
ethersRaised = ethersRaised.add(ethers);
// Log event
PrecommitmentAdded(participant, tokens, ethers);
}
event PrecommitmentAdded(address indexed participant, uint tokens, uint ethers);
// ------------------------------------------------------------------------
// Fallback function to receive ETH contributions send directly to the
// contract address
// ------------------------------------------------------------------------
function() public payable {
proxyPayment(msg.sender);
}
// ------------------------------------------------------------------------
// Receive ETH contributions. Can use this to send tokens to another
// account
// ------------------------------------------------------------------------
function proxyPayment(address contributor) public payable {
// Check we are still in the crowdsale period
require(block.timestamp >= START_DATE && block.timestamp <= END_DATE);
// Check for invalid address
require(contributor != 0x0);
// Check that contributor has sent ETH
require(msg.value > 0);
// Keep track of ETH raised
ethersRaised = ethersRaised.add(msg.value);
// Check we have not exceeded the hard cap
require(ethersRaised <= ETH_HARD_CAP);
// Calculate tokens for contributed ETH
uint tokens = msg.value.mul(tokensPerKEther).div(1000);
// Mint tokens for contributor
mint(contributor, tokens);
// Log ETH contributed and tokens generated
TokensBought(contributor, msg.value, tokens);
// Transfer ETH to coffer
wallet.transfer(msg.value);
}
event TokensBought(address indexed contributor, uint ethers, uint tokens);
// ------------------------------------------------------------------------
// Finalise crowdsale, 20% of tokens for myself
// ------------------------------------------------------------------------
function finalise() public onlyOwner {
// Can only finalise once
require(!finalised);
// Can only finalise if we are past end date, or hard cap reached
require(block.timestamp > END_DATE || ethersRaised == ETH_HARD_CAP);
// Mark as finalised
finalised = true;
// Allow tokens to be transferable
transferable = true;
// Mint tokens for my coffer, being 20% of crowdsold tokens
uint myTokens = totalSupply.mul(20).div(80);
mint(owner, myTokens);
}
// ------------------------------------------------------------------------
// transfer tokens, only transferable after the crowdsale is finalised
// ------------------------------------------------------------------------
function transfer(address to, uint tokens) public returns (bool success) {
// Can only transfer after crowdsale completed
require(transferable);
return super.transfer(to, tokens);
}
// ------------------------------------------------------------------------
// transferFrom tokens, only transferable after the crowdsale is finalised
// ------------------------------------------------------------------------
function transferFrom(address from, address to, uint tokens) public
returns (bool success)
{
// Can only transfer after crowdsale completed
require(transferable);
return super.transferFrom(from, to, tokens);
}
}I compiled the code in Remix and copied the deployment
script below, set the from account, and added gasPrice: web3.toWei(105, "gwei") as the Ropsten network is still recovering from the recent
attack.
var browser_testi_sol_mycrowdsaleContract = web3.eth.contract([{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"spender","type":"address"},{"name":"tokens","type":"uint256"}],"name":"approve","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"finalised","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"from","type":"address"},{"name":"to","type":"address"},{"name":"tokens","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"START_DATE","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"wallet","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"END_DATE","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"ETH_HARD_CAP","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"account","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"acceptOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"DECIMALSFACTOR","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"transferable","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"participant","type":"address"},{"name":"tokens","type":"uint256"},{"name":"ethers","type":"uint256"}],"name":"addPrecommitment","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":"finalise","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"tokensPerKEther","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"tokens","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"newOwner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"ethersRaised","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"tokenAddress","type":"address"},{"name":"tokens","type":"uint256"}],"name":"transferAnyERC20Token","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"owner","type":"address"},{"name":"spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"contributor","type":"address"}],"name":"proxyPayment","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"participant","type":"address"},{"indexed":false,"name":"tokens","type":"uint256"},{"indexed":false,"name":"ethers","type":"uint256"}],"name":"PrecommitmentAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"contributor","type":"address"},{"indexed":false,"name":"ethers","type":"uint256"},{"indexed":false,"name":"tokens","type":"uint256"}],"name":"TokensBought","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"}],"name":"OwnershipTransferred","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"}]);
var browser_testi_sol_mycrowdsale = browser_testi_sol_mycrowdsaleContract.new(
{
from: "0x74ed6eb23c21403d7a00bf388a2ec691b98ba8ed",
data: '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gas: '4700000',
gasPrice: web3.toWei(105, "gwei")
}, function (e, contract){
console.log(e, contract);
if (typeof contract.address !== 'undefined') {
console.log('Contract mined! address: ' + contract.address + ' transactionHash: ' + contract.transactionHash);
}
})
The transaction 0xb34d1c4f created the contract at 0xa858cc5abf91a7dfcff20ee80859e42d9959df08.
I added the address in the source code and verified the source code at the contract address.
I compiled the code in Remix:
- In Remix, select the Compile tab
- Select browser/name.sol/MyCrowdsale in the dropdown on the top right
- Click on Details
- You will see the BYTECODE section
- Click on the clipboard icon to copy the bytecode to your clipboard. This is the bytecode that you can deploy using MyEtherWallet
Open https://www.myetherwallet.com/ in your browser:
- In the top right of the MEW screen, select the Network: Ropsten (MyEtherWallet)
- In the top right of the MEW screen, select the maximum Gas Price
- Select the Contracts tab
- Click on Deploy Contract
- Paste the bytecode from the previous instructions in the Byte Code text box
- Set your Gas Limit to 2000000 (2 million)
- Select Keystore File (UTC / JSON) or Private Key and unlock your account
- Deploy the transaction and search for the contract by viewing the transactions for your account in https://ropsten.etherscan.io/
- View the code for your contract in https://ropsten.etherscan.io/
- Cick on Verify Source and paste in your source code
- Type MyCrowdsale in the contract name field
- Select the same compiler version as you used in Remix above
- Select optimisation On or Off, the same setting as in the Remix Settings tab, in the Enable Optimisation field
- Confirm with EtherScan that you want the source code verified
- Send some ETH to your crowdsale contract address
- View the transaction in EtherScan and verify that tokens were transferred to your account
Enjoy. (c) BokkyPooBah / Bok Consulting Pty Ltd and other contributors - 2018. The MIT Licence.