Address Contract Verified
Address
0xE61a4c119408ecD8764b6DCf877f6b4c07A21EE4
Balance
0 ETH
Nonce
1
Code Size
12967 bytes
Creator
0x24500FFD...c516 at tx 0x5b3c6292...22cf03
Indexed Transactions
0
Contract Bytecode
12967 bytes
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Verified Source Code Full Match
Compiler: v0.5.16+commit.9c3226ce
EVM: istanbul
Optimization: No
chiToken.sol 359 lines
// SPDX-License-Identifier: MIT
pragma solidity ^0.5.16;
contract chiToken {
/// @notice EIP-20 token name for this token
string public constant name = "DragonDAO";
/// @notice EIP-20 token symbol for this token
string public constant symbol = "CHI";
/// @notice EIP-20 token decimals for this token
uint8 public constant decimals = 18;
/// @notice Total number of tokens in circulation
uint128 private _totalSupply = 10_000_000_000e18; // 10 billion Dragon
/// @notice Allowance amounts on behalf of others
mapping (address => mapping (address => uint128)) internal allowances;
/// @notice Official record of token balances for each accountƒ
mapping (address => uint128) internal balances;
/// @notice A record of each accounts delegate
mapping (address => address) public delegates;
/// @notice A checkpoint for marking number of votes from a given block
struct Checkpoint {
uint32 fromBlock;
uint128 votes;
}
/// @notice A record of votes checkpoints for each account, by index
mapping (address => mapping (uint32 => Checkpoint)) public checkpoints;
/// @notice The number of checkpoints for each account
mapping (address => uint32) public numCheckpoints;
/// @notice The EIP-712 typehash for the contract's domain
bytes32 public constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");
/// @notice The EIP-712 typehash for the delegation struct used by the contract
bytes32 public constant DELEGATION_TYPEHASH = keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");
/// @notice A record of states for signing / validating signatures
mapping (address => uint) public nonces;
/**
* @notice Construct a new TT token
* @param account The initial account to grant all the tokens
*/
constructor(address account) public {
balances[account] = uint128(_totalSupply);
emit Transfer(address(0), account, _totalSupply);
}
/** ========== token functions ========== */
function totalSupply() public view returns (uint128) {
return _totalSupply;
}
/**
* @notice Get the number of tokens `spender` is approved to spend on behalf of `account`
* @param account The address of the account holding the funds
* @param spender The address of the account spending the funds
* @return The number of tokens approved
*/
function allowance(address account, address spender) public view returns (uint128) {
return allowances[account][spender];
}
/**
* @notice Approve `spender` to transfer up to `amount` from `src`
* @dev This will overwrite the approval amount for `spender`
* and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
* @param spender The address of the account which may transfer tokens
* @param rawAmount The number of tokens that are approved (2^256-1 means infinite)
* @return Whether or not the approval succeeded
*/
function approve(address spender, uint rawAmount) public returns (bool) {
uint128 amount;
if (rawAmount == uint(-1)) {
amount = uint128(-1);
} else {
amount = safe128(rawAmount, "approve: amount exceeds 128 bits");
}
allowances[msg.sender][spender] = amount;
emit Approval(msg.sender, spender, amount);
return true;
}
/**
* @notice Get the number of tokens held by the `account`
* @param account The address of the account to get the balance of
* @return The number of tokens held
*/
function balanceOf(address account) public view returns (uint) {
return balances[account];
}
/**
* @notice Transfer `amount` tokens from `msg.sender` to `dst`
* @param dst The address of the destination account
* @param rawAmount The number of tokens to transfer
* @return Whether or not the transfer succeeded
*/
function transfer(address dst, uint rawAmount) external returns (bool) {
uint128 amount = safe128(rawAmount, "transfer: amount exceeds 128 bits");
_transferTokens(msg.sender, dst, amount);
return true;
}
/**
* @notice Transfer `amount` tokens from `src` to `dst`
* @param src The address of the source account
* @param dst The address of the destination account
* @param rawAmount The number of tokens to transfer
* @return Whether or not the transfer succeeded
*/
function transferFrom(address src, address dst, uint rawAmount) external returns (bool) {
address spender = msg.sender;
uint128 spenderAllowance = allowances[src][spender];
uint128 amount = safe128(rawAmount, "approve: amount exceeds 128 bits");
if (spender != src && spenderAllowance != uint128(-1)) {
uint128 newAllowance = sub128(spenderAllowance, amount, "transferFrom: transfer amount exceeds spender allowance");
allowances[src][spender] = newAllowance;
emit Approval(src, spender, newAllowance);
}
_transferTokens(src, dst, amount);
return true;
}
/**
* @dev Destroys `amount` tokens from the caller.
*
* See {ERC20-_burn}.
* votes will be updated after burn() whoever the delegator is.
*/
function burn(uint256 rawAmount) external returns (bool) {
uint128 amount = safe128(rawAmount, "_burn: amount exceeds 128 bits");
require(_burn(msg.sender, amount), "burn: fail to burn");
return true;
}
/**
* @dev Destroys `amount` tokens from `account`, deducting from the caller's
* allowance.
*
* See {ERC20-_burn} and {ERC20-allowance}.
*
* Requirements:
*
* - the caller must have allowance for ``accounts``'s tokens of at least
* `amount`.
*/
function burnFrom(address account, uint256 rawAmount) external returns (bool) {
uint128 amount = safe128(rawAmount, "_burn: amount exceeds 128 bits");
uint128 decreasedAllowance = sub128(allowance(account, msg.sender), amount, "ERC20: burn amount exceeds allowance");
allowances[account][msg.sender] = decreasedAllowance;
require(_burn(account, amount), "burn: fail to burn");
return true;
}
/** ========== voting functions ========== */
/**
* @notice Delegate votes from `msg.sender` to `delegatee`
* @param delegatee The address to delegate votes to
*/
function delegate(address delegatee) public {
return _delegate(msg.sender, delegatee);
}
/**
* @notice Delegates votes from signatory to `delegatee`
* @param delegatee The address to delegate votes to
* @param nonce The contract state required to match the signature
* @param expiry The time at which to expire the signature
* @param v The recovery byte of the signature
* @param r Half of the ECDSA signature pair
* @param s Half of the ECDSA signature pair
*/
function delegateBySig(address delegatee, uint nonce, uint expiry, uint8 v, bytes32 r, bytes32 s) public {
bytes32 domainSeparator = keccak256(abi.encode(DOMAIN_TYPEHASH, keccak256(bytes(name)), getChainId(), address(this)));
bytes32 structHash = keccak256(abi.encode(DELEGATION_TYPEHASH, delegatee, nonce, expiry));
bytes32 digest = keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
address signatory = ecrecover(digest, v, r, s);
require(signatory != address(0), "delegateBySig: invalid signature");
require(nonce == nonces[signatory]++, "delegateBySig: invalid nonce");
require(now <= expiry, "delegateBySig: signature expired");
return _delegate(signatory, delegatee);
}
/**
* @notice Gets the current votes balance for `account`
* @param account The address to get votes balance
* @return The number of current votes for `account`
*/
function getCurrentVotes(address account) external view returns (uint128) {
uint32 nCheckpoints = numCheckpoints[account];
return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
}
/**
* @notice Determine the prior number of votes for an account as of a block number
* @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
* @param account The address of the account to check
* @param blockNumber The block number to get the vote balance at
* @return The number of votes the account had as of the given block
*/
function getPriorVotes(address account, uint blockNumber) public view returns (uint128) {
require(blockNumber < block.number, "getPriorVotes: not yet determined");
uint32 nCheckpoints = numCheckpoints[account];
if (nCheckpoints == 0) {
return 0;
}
// First check most recent balance
if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
return checkpoints[account][nCheckpoints - 1].votes;
}
// Next check implicit zero balance
if (checkpoints[account][0].fromBlock > blockNumber) {
return 0;
}
uint32 lower = 0;
uint32 upper = nCheckpoints - 1;
while (upper > lower) {
uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
Checkpoint memory cp = checkpoints[account][center];
if (cp.fromBlock == blockNumber) {
return cp.votes;
} else if (cp.fromBlock < blockNumber) {
lower = center;
} else {
upper = center - 1;
}
}
return checkpoints[account][lower].votes;
}
/** ========== internal mutative functions ========== */
/**
* @notice burn token and decrease user's votes
* @param src The address of the account burning token
* @param rawAmount The amount of burning token
*/
function _burn(address src, uint256 rawAmount) internal returns (bool) {
require(src != address(0), "_burn: burn from the zero address");
uint128 amount = safe128(rawAmount, "_burn: amount exceeds 128 bits");
balances[src] = sub128(balances[src], amount, "_burn: burn amount exceeds balance");
_totalSupply = sub128(_totalSupply, amount, "_burn: all token have been burnt");
_moveDelegates(delegates[src], address(0), amount);
emit Transfer(src, address(0), amount);
return true;
}
function _delegate(address delegator, address delegatee) internal {
address currentDelegate = delegates[delegator];
uint128 delegatorBalance = balances[delegator];
delegates[delegator] = delegatee;
emit DelegateChanged(delegator, currentDelegate, delegatee);
_moveDelegates(currentDelegate, delegatee, delegatorBalance);
}
function _transferTokens(address src, address dst, uint128 amount) internal {
require(src != address(0), "_transferTokens: cannot transfer from the zero address");
require(dst != address(0), "_transferTokens: cannot transfer to the zero address");
balances[src] = sub128(balances[src], amount, "_transferTokens: transfer amount exceeds balance");
balances[dst] = add128(balances[dst], amount, "_transferTokens: transfer amount overflows");
emit Transfer(src, dst, amount);
_moveDelegates(delegates[src], delegates[dst], amount);
}
function _moveDelegates(address srcRep, address dstRep, uint128 amount) internal {
if (srcRep != dstRep && amount > 0) {
if (srcRep != address(0)) {
uint32 srcRepNum = numCheckpoints[srcRep];
uint128 srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;
uint128 srcRepNew = sub128(srcRepOld, amount, "_moveVotes: vote amount underflows");
_writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
}
if (dstRep != address(0)) {
uint32 dstRepNum = numCheckpoints[dstRep];
uint128 dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;
uint128 dstRepNew = add128(dstRepOld, amount, "_moveVotes: vote amount overflows");
_writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
}
}
}
function _writeCheckpoint(address delegatee, uint32 nCheckpoints, uint128 oldVotes, uint128 newVotes) internal {
uint32 blockNumber = safe32(block.number, "_writeCheckpoint: block number exceeds 32 bits");
if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) {
checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
} else {
checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
numCheckpoints[delegatee] = nCheckpoints + 1;
}
emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
}
function safe32(uint n, string memory errorMessage) internal pure returns (uint32) {
require(n < 2**32, errorMessage);
return uint32(n);
}
function safe128(uint n, string memory errorMessage) internal pure returns (uint128) {
require(n < 2**128, errorMessage);
return uint128(n);
}
function add128(uint128 a, uint128 b, string memory errorMessage) internal pure returns (uint128) {
uint128 c = a + b;
require(c >= a, errorMessage);
return c;
}
function sub128(uint128 a, uint128 b, string memory errorMessage) internal pure returns (uint128) {
require(b <= a, errorMessage);
return a - b;
}
function getChainId() internal pure returns (uint) {
uint256 chainId;
assembly { chainId := chainid() }
return chainId;
}
/// @notice An event thats emitted when an account changes its delegate
event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);
/// @notice An event thats emitted when a delegate account's vote balance changes
event DelegateVotesChanged(address indexed delegate, uint previousBalance, uint newBalance);
/// @notice The standard EIP-20 transfer event
event Transfer(address indexed from, address indexed to, uint256 amount);
/// @notice The standard EIP-20 approval event
event Approval(address indexed owner, address indexed spender, uint256 amount);
}
Read Contract
DELEGATION_TYPEHASH 0xe7a324dc → bytes32
DOMAIN_TYPEHASH 0x20606b70 → bytes32
allowance 0xdd62ed3e → uint128
balanceOf 0x70a08231 → uint256
checkpoints 0xf1127ed8 → uint32, uint128
decimals 0x313ce567 → uint8
delegates 0x587cde1e → address
getCurrentVotes 0xb4b5ea57 → uint128
getPriorVotes 0x782d6fe1 → uint128
name 0x06fdde03 → string
nonces 0x7ecebe00 → uint256
numCheckpoints 0x6fcfff45 → uint32
symbol 0x95d89b41 → string
totalSupply 0x18160ddd → uint128
Write Contract 7 functions
These functions modify contract state and require a wallet transaction to execute.
approve 0x095ea7b3
address spender
uint256 rawAmount
returns: bool
burn 0x42966c68
uint256 rawAmount
returns: bool
burnFrom 0x79cc6790
address account
uint256 rawAmount
returns: bool
delegate 0x5c19a95c
address delegatee
delegateBySig 0xc3cda520
address delegatee
uint256 nonce
uint256 expiry
uint8 v
bytes32 r
bytes32 s
transfer 0xa9059cbb
address dst
uint256 rawAmount
returns: bool
transferFrom 0x23b872dd
address src
address dst
uint256 rawAmount
returns: bool
Recent Transactions
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