pragma solidity ^0.4.21;
// ----------------------------------------------------------------------------
// 'PoWEth Token' contract
// Mineable ERC20 Token using Proof Of Work
//
// Symbol : PoWEth
// Name : PoWEth Token
// Total supply: 100,000,000.00
// Decimals : 8
//
// ----------------------------------------------------------------------------
// ----------------------------------------------------------------------------
// Safe maths
// ----------------------------------------------------------------------------
library SafeMath {
function add(uint a, uint b) internal pure returns (uint c) {
c = a + b;
require(c >= a);
}
function sub(uint a, uint b) internal pure returns (uint c) {
require(b <= a);
c = a - b;
}
function mul(uint a, uint b) internal pure returns (uint c) {
c = a * b;
require(a == 0 || c / a == b);
}
}
library ExtendedMath {
//return the smaller of the two inputs (a or b)
function limitLessThan(uint a, uint b) internal pure returns (uint c) {
if(a > b) return b;
return a;
}
}
contract ERC20Interface {
function totalSupply() public constant returns (uint);
function balanceOf(address tokenOwner) public constant returns (uint balance);
function allowance(address tokenOwner, address spender) public constant returns (uint remaining);
function transfer(address to, uint tokens) public returns (bool success);
function approve(address spender, uint tokens) public returns (bool success);
function transferFrom(address from, address to, uint tokens) public returns (bool success);
event Transfer(address indexed from, address indexed to, uint tokens);
event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
}
contract ApproveAndCallFallBack {
function receiveApproval(address from, uint256 tokens, address token, bytes data) public;
}
// ----------------------------------------------------------------------------
// ERC20 Token, with the addition of symbol, name and decimals and an
// initial fixed supply
// ----------------------------------------------------------------------------
contract _0xEtherToken is ERC20Interface {
using SafeMath for uint;
using ExtendedMath for uint;
string public symbol = "PoWEth";
string public name = "PoWEth Token";
uint8 public decimals = 8;
uint public _totalSupply = 10000000000000000;
uint public maxSupplyForEra = 5000000000000000;
uint public latestDifficultyPeriodStarted;
uint public tokensMinted;
uint public epochCount; //number of 'blocks' mined
uint public _BLOCKS_PER_READJUSTMENT = 1024;
uint public _MINIMUM_TARGET = 2**16;
uint public _MAXIMUM_TARGET = 2**234;
uint public miningTarget = _MAXIMUM_TARGET;
bytes32 public challengeNumber; //generate a new one when a new reward is minted
uint public rewardEra;
address public lastRewardTo;
uint public lastRewardAmount;
uint public lastRewardEthBlockNumber;
mapping(bytes32 => bytes32) solutionForChallenge;
mapping(address => uint) balances;
mapping(address => mapping(address => uint)) allowed;
address private owner;
event Mint(address indexed from, uint reward_amount, uint epochCount, bytes32 newChallengeNumber);
function _0xEtherToken() public {
owner = msg.sender;
latestDifficultyPeriodStarted = block.number;
_startNewMiningEpoch();
//The owner gets nothing! You must mine this ERC20 token
//balances[owner] = _totalSupply;
//Transfer(address(0), owner, _totalSupply);
}
function mint(uint256 nonce, bytes32 challenge_digest) public returns (bool success) {
//the PoW must contain work that includes a recent ethereum block hash (challenge number) and the msg.sender's address to prevent MITM attacks
bytes32 digest = keccak256(challengeNumber, msg.sender, nonce );
//the challenge digest must match the expected
if (digest != challenge_digest) revert();
//the digest must be smaller than the target
if(uint256(digest) > miningTarget) revert();
//only allow one reward for each challenge
bytes32 solution = solutionForChallenge[challengeNumber];
solutionForChallenge[challengeNumber] = digest;
if(solution != 0x0)
revert(); //prevent the same answer from awarding twice
uint reward_amount = getMiningReward();
balances[msg.sender] = balances[msg.sender].add(reward_amount);
tokensMinted = tokensMinted.add(reward_amount);
//Cannot mint more tokens than there are
assert(tokensMinted <= maxSupplyForEra);
//set readonly diagnostics data
lastRewardTo = msg.sender;
lastRewardAmount = reward_amount;
lastRewardEthBlockNumber = block.number;
_startNewMiningEpoch();
emit Mint(msg.sender, reward_amount, epochCount, challengeNumber );
return true;
}
//a new 'block' to be mined
function _startNewMiningEpoch() internal {
//if max supply for the era will be exceeded next reward round then enter the new era before that happens
//20 is the final reward era, almost all tokens minted
//once the final era is reached, more tokens will not be given out because the assert function
// 1 era is estimated 1,5y, 20 era is roughly 60y of mining time
if( tokensMinted.add(getMiningReward()) > maxSupplyForEra && rewardEra < 19)
{
rewardEra = rewardEra + 1;
}
maxSupplyForEra = _totalSupply - _totalSupply / (2**(rewardEra + 1));
epochCount = epochCount.add(1);
//every so often, readjust difficulty. Dont readjust when deploying
if(epochCount % _BLOCKS_PER_READJUSTMENT == 0)
{
_reAdjustDifficulty();
}
//make the latest ethereum block hash a part of the next challenge for PoW to prevent pre-mining future blocks
//do this last since this is a protection mechanism in the mint() function
challengeNumber = block.blockhash(block.number - 1);
}
//https://en.bitcoin.it/wiki/Difficulty#What_is_the_formula_for_difficulty.3F
//as of 2017 the bitcoin difficulty was up to 17 zeroes, it was only 8 in the early days
//readjust the target by 5 percent
function _reAdjustDifficulty() internal {
uint ethBlocksSinceLastDifficultyPeriod = block.number - latestDifficultyPeriodStarted;
//assume 240 ethereum blocks per hour
//we want miners to spend ~7,5 minutes to mine each 'block', about 30 ethereum blocks = 1 PoWEth epoch
uint targetEthBlocksPerDiffPeriod = _BLOCKS_PER_READJUSTMENT * 30; //should be 30 times slower than ethereum
//if there were less eth blocks passed in time than expected
if(ethBlocksSinceLastDifficultyPeriod < targetEthBlocksPerDiffPeriod)
{
uint excess_block_pct = (targetEthBlocksPerDiffPeriod.mul(100)) / ethBlocksSinceLastDifficultyPeriod;
uint excess_block_pct_extra = excess_block_pct.sub(100).limitLessThan(1000);
//make it harder
miningTarget = miningTarget.sub((miningTarget/2000).mul(excess_block_pct_extra));
}else{
uint shortage_block_pct = (ethBlocksSinceLastDifficultyPeriod.mul(100)) / targetEthBlocksPerDiffPeriod;
uint shortage_block_pct_extra = shortage_block_pct.sub(100).limitLessThan(1000);
//make it easier
miningTarget = miningTarget.add((miningTarget/2000).mul(shortage_block_pct_extra));
}
latestDifficultyPeriodStarted = block.number;
if(miningTarget < _MINIMUM_TARGET) //very difficult
{
miningTarget = _MINIMUM_TARGET;
}
if(miningTarget > _MAXIMUM_TARGET) //very easy
{
miningTarget = _MAXIMUM_TARGET;
}
}
//this is a recent ethereum block hash, used to prevent pre-mining future blocks
function getChallengeNumber() public constant returns (bytes32) {
return challengeNumber;
}
//the number of zeroes the digest of the PoW solution requires. Auto adjusts
function getMiningDifficulty() public constant returns (uint) {
return _MAXIMUM_TARGET / miningTarget;
}
function getMiningTarget() public constant returns (uint) {
return miningTarget;
}
//100m coins total
//reward begins at 250 and is cut in half every reward era (as tokens are mined)
function getMiningReward() public constant returns (uint) {
return 25000000000/(2**rewardEra);
}
// ------------------------------------------------------------------------
// Total supply
// ------------------------------------------------------------------------
function totalSupply() public constant returns (uint) {
return _totalSupply - balances[address(0)];
}
// ------------------------------------------------------------------------
// Get the token balance for account `tokenOwner`
// ------------------------------------------------------------------------
function balanceOf(address tokenOwner) public constant returns (uint balance) {
return balances[tokenOwner];
}
// ------------------------------------------------------------------------
// Transfer the balance from token owner's account to `to` account
// - Owner's account must have sufficient balance to transfer
// - 0 value transfers are allowed
// ------------------------------------------------------------------------
function transfer(address to, uint tokens) public returns (bool success) {
balances[msg.sender] = balances[msg.sender].sub(tokens);
balances[to] = balances[to].add(tokens);
emit Transfer(msg.sender, to, tokens);
return true;
}
// ------------------------------------------------------------------------
// Token owner can approve for `spender` to transferFrom(...) `tokens`
// from the token owner's account
//
// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md
// recommends that there are no checks for the approval double-spend attack
// as this should be implemented in user interfaces
// ------------------------------------------------------------------------
function approve(address spender, uint tokens) public returns (bool success) {
allowed[msg.sender][spender] = tokens;
emit Approval(msg.sender, spender, tokens);
return true;
}
// ------------------------------------------------------------------------
// Transfer `tokens` from the `from` account to the `to` account
//
// The calling account must already have sufficient tokens approve(...)-d
// for spending from the `from` account and
// - From account must have sufficient balance to transfer
// - Spender must have sufficient allowance to transfer
// - 0 value transfers are allowed
// ------------------------------------------------------------------------
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);
emit Transfer(from, to, tokens);
return true;
}
// ------------------------------------------------------------------------
// Returns the amount of tokens approved by the owner that can be
// transferred to the spender's account
// ------------------------------------------------------------------------
function allowance(address tokenOwner, address spender) public constant returns (uint remaining) {
return allowed[tokenOwner][spender];
}
// ------------------------------------------------------------------------
// Token owner can approve for `spender` to transferFrom(...) `tokens`
// from the token owner's account. The `spender` contract function
// `receiveApproval(...)` is then executed
// ------------------------------------------------------------------------
function approveAndCall(address spender, uint tokens, bytes data) public returns (bool success) {
allowed[msg.sender][spender] = tokens;
emit Approval(msg.sender, spender, tokens);
ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, this, data);
return true;
}
// ------------------------------------------------------------------------
// Don't accept ETH
// ------------------------------------------------------------------------
function () public payable {
revert();
}
// ------------------------------------------------------------------------
// Owner can transfer out any accidentally sent ERC20 tokens
// ------------------------------------------------------------------------
function transferAnyERC20Token(address tokenAddress, uint tokens) public returns (bool success) {
require(msg.sender == owner);
return ERC20Interface(tokenAddress).transfer(owner, tokens);
}
//help debug mining software
function getMintDigest(uint256 nonce, bytes32 challenge_number) public view returns (bytes32 digesttest) {
bytes32 digest = keccak256(challenge_number,msg.sender,nonce);
return digest;
}
//help debug mining software
function checkMintSolution(uint256 nonce, bytes32 challenge_digest, bytes32 challenge_number, uint testTarget) public view returns (bool success) {
bytes32 digest = keccak256(challenge_number,msg.sender,nonce);
if(uint256(digest) > testTarget)
revert();
return (digest == challenge_digest);
}
}
{
"compilationTarget": {
"_0xEtherToken.sol": "_0xEtherToken"
},
"evmVersion": "byzantium",
"libraries": {},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
}
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