Address Contract Verified
Address
0xF5c583AffDA8DFbEFec2cd5c072Dc78e9250CcE5
Balance
0 ETH
Nonce
1
Code Size
16111 bytes
Creator
0x3170E695...D3e4 at tx 0xe7e61f71...f8bf02
Indexed Transactions
0
Contract Bytecode
16111 bytes
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Verified Source Code Full Match
Compiler: v0.7.6+commit.7338295f
EVM: istanbul
Optimization: No
YFLOW.sol 458 lines
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;
pragma experimental ABIEncoderV2;
import "./SafeMath.sol";
contract YFLOW {
/// @notice EIP-20 token name for this token
string public constant name = "Yieldflow";
/// @notice EIP-20 token symbol for this token
string public constant symbol = "YFLOW";
/// @notice EIP-20 token decimals for this token
uint8 public constant decimals = 18;
/// @notice Address which may mint new tokens
address public minter;
/// @notice The timestamp after which minting may occur
uint256 public mintingAllowedAfter;
/// @notice Cap on the percentage of totalSupply that can be minted at each mint
uint8 public constant mintCap = 10;
/// @notice Minimum time between mints
uint32 public constant minimumTimeBetweenMints = 90 days;
/// @notice Total number of tokens in circulation
uint256 public totalSupply = 50_000_000e18;
mapping(address => mapping(address => uint96)) internal allowances;
mapping(address => uint96) internal balances;
mapping(address => address) public delegates;
struct Checkpoint {
uint32 fromBlock;
uint96 votes;
}
mapping(address => mapping(uint32 => Checkpoint)) public checkpoints;
mapping(address => uint32) public numCheckpoints;
bytes32 public constant DOMAIN_TYPEHASH = keccak256(
"EIP712Domain(string name,uint256 chainId,address verifyingContract)"
);
bytes32 public constant DELEGATION_TYPEHASH = keccak256(
"Delegation(address delegatee,uint256 nonce,uint256 expiry)"
);
bytes32 public constant PERMIT_TYPEHASH = keccak256(
"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
);
mapping(address => uint256) public nonces;
/// @notice An event thats emitted when the minter address is changed
event MinterChanged(address minter, address newMinter);
event DelegateChanged(
address indexed delegator,
address indexed fromDelegate,
address indexed toDelegate
);
event DelegateVotesChanged(
address indexed delegate,
uint256 previousBalance,
uint256 newBalance
);
event Transfer(address indexed from, address indexed to, uint256 amount);
event Approval(
address indexed owner,
address indexed spender,
uint256 amount
);
constructor(address account, address minter_, uint256 mintingAllowedAfter_) {
require(
mintingAllowedAfter_ >= block.timestamp,
"yflow::constructor: minting can only begin after deployment"
);
balances[account] = uint96(totalSupply);
emit Transfer(address(0), account, totalSupply);
minter = minter_;
emit MinterChanged(address(0), minter);
mintingAllowedAfter = mintingAllowedAfter_;
}
/**
* @notice Change the minter address
* @param minter_ The address of the new minter
*/
function setMinter(address minter_) external {
require(msg.sender == minter, "yflow::setMinter: only the minter can change the minter address");
emit MinterChanged(minter, minter_);
minter = minter_;
}
/**
* @notice Mint new tokens
* @param dst The address of the destination account
* @param rawAmount The number of tokens to be minted
*/
function mint(address dst, uint rawAmount) external {
require(msg.sender == minter, "yflow::mint: only the minter can mint");
require(block.timestamp >= mintingAllowedAfter, "yflow::mint: minting not allowed yet");
require(dst != address(0), "yflow::mint: cannot transfer to the zero address");
// record the mint
mintingAllowedAfter = SafeMath.add(block.timestamp, minimumTimeBetweenMints);
// mint the amount
uint96 amount = safe96(rawAmount, "yflow::mint: amount exceeds 96 bits");
require(amount <= SafeMath.div(SafeMath.mul(totalSupply, mintCap), 100), "yflow::mint: exceeded mint cap");
totalSupply = safe96(SafeMath.add(totalSupply, amount), "yflow::mint: totalSupply exceeds 96 bits");
// transfer the amount to the recipient
balances[dst] = add96(balances[dst], amount, "yflow::mint: transfer amount overflows");
emit Transfer(address(0), dst, amount);
// move delegates
_moveDelegates(address(0), delegates[dst], amount);
}
function allowance(address account, address spender)
external
view
returns (uint256)
{
return allowances[account][spender];
}
function approve(address spender, uint256 rawAmount) external returns (bool) {
uint96 amount;
if (rawAmount == uint256(-1)) {
amount = uint96(-1);
} else {
amount = safe96(rawAmount, "yflow::approve: amount exceeds 96 bits");
}
allowances[msg.sender][spender] = amount;
emit Approval(msg.sender, spender, amount);
return true;
}
function permit(
address owner,
address spender,
uint256 rawAmount,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external {
uint96 amount;
if (rawAmount == uint256(-1)) {
amount = uint96(-1);
} else {
amount = safe96(rawAmount, "yflow::permit: amount exceeds 96 bits");
}
bytes32 domainSeparator = keccak256(
abi.encode(
DOMAIN_TYPEHASH,
keccak256(bytes(name)),
getChainId(),
address(this)
)
);
bytes32 structHash = keccak256(
abi.encode(
PERMIT_TYPEHASH,
owner,
spender,
rawAmount,
nonces[owner]++,
deadline
)
);
bytes32 digest = keccak256(
abi.encodePacked("\x19\x01", domainSeparator, structHash)
);
address signatory = ecrecover(digest, v, r, s);
require(signatory != address(0), "yflow::permit: invalid signature");
require(signatory == owner, "yflow::permit: unauthorized");
require(block.timestamp <= deadline, "yflow::permit: signature expired");
allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
function balanceOf(address account) external view returns (uint256) {
return balances[account];
}
function nonceOf(address account) external view returns (uint256) {
return nonces[account];
}
function transfer(address dst, uint256 rawAmount) external returns (bool) {
uint96 amount = safe96(rawAmount, "yflow::transfer: amount exceeds 96 bits");
_transferTokens(msg.sender, dst, amount);
return true;
}
function transferFrom(
address src,
address dst,
uint256 rawAmount
) external returns (bool) {
address spender = msg.sender;
uint96 spenderAllowance = allowances[src][spender];
uint96 amount = safe96(rawAmount, "yflow::approve: amount exceeds 96 bits");
if (spender != src && spenderAllowance != uint96(-1)) {
uint96 newAllowance = sub96(
spenderAllowance,
amount,
"yflow::transferFrom: transfer amount exceeds spender allowance"
);
allowances[src][spender] = newAllowance;
emit Approval(src, spender, newAllowance);
}
_transferTokens(src, dst, amount);
return true;
}
function delegate(address delegatee) public {
return _delegate(msg.sender, delegatee);
}
function delegateBySig(
address delegatee,
uint256 nonce,
uint256 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), "yflow::delegateBySig: invalid signature");
require(nonce == nonces[signatory]++, "yflow::delegateBySig: invalid nonce");
require(block.timestamp <= expiry, "yflow::delegateBySig: signature expired");
return _delegate(signatory, delegatee);
}
function getCurrentVotes(address account) external view returns (uint96) {
uint32 nCheckpoints = numCheckpoints[account];
return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
}
function getPriorVotes(address account, uint256 blockNumber)
public
view
returns (uint96)
{
require(
blockNumber < block.number,
"yflow::getPriorVotes: not yet determined"
);
uint32 nCheckpoints = numCheckpoints[account];
if (nCheckpoints == 0) {
return 0;
}
if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
return checkpoints[account][nCheckpoints - 1].votes;
}
if (checkpoints[account][0].fromBlock > blockNumber) {
return 0;
}
uint32 lower = 0;
uint32 upper = nCheckpoints - 1;
while (upper > lower) {
uint32 center = upper - (upper - lower) / 2;
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;
}
function _delegate(address delegator, address delegatee) internal {
address currentDelegate = delegates[delegator];
uint96 delegatorBalance = balances[delegator];
delegates[delegator] = delegatee;
emit DelegateChanged(delegator, currentDelegate, delegatee);
_moveDelegates(currentDelegate, delegatee, delegatorBalance);
}
function _transferTokens(
address src,
address dst,
uint96 amount
) internal {
require(
src != address(0),
"yflow::_transferTokens: cannot transfer from the zero address"
);
require(
dst != address(0),
"yflow::_transferTokens: cannot transfer to the zero address"
);
balances[src] = sub96(
balances[src],
amount,
"yflow::_transferTokens: transfer amount exceeds balance"
);
balances[dst] = add96(
balances[dst],
amount,
"yflow::_transferTokens: transfer amount overflows"
);
emit Transfer(src, dst, amount);
_moveDelegates(delegates[src], delegates[dst], amount);
}
function _moveDelegates(
address srcRep,
address dstRep,
uint96 amount
) internal {
if (srcRep != dstRep && amount > 0) {
if (srcRep != address(0)) {
uint32 srcRepNum = numCheckpoints[srcRep];
uint96 srcRepOld = srcRepNum > 0
? checkpoints[srcRep][srcRepNum - 1].votes
: 0;
uint96 srcRepNew = sub96(
srcRepOld,
amount,
"yflow::_moveVotes: vote amount underflows"
);
_writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
}
if (dstRep != address(0)) {
uint32 dstRepNum = numCheckpoints[dstRep];
uint96 dstRepOld = dstRepNum > 0
? checkpoints[dstRep][dstRepNum - 1].votes
: 0;
uint96 dstRepNew = add96(
dstRepOld,
amount,
"yflow::_moveVotes: vote amount overflows"
);
_writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
}
}
}
function _writeCheckpoint(
address delegatee,
uint32 nCheckpoints,
uint96 oldVotes,
uint96 newVotes
) internal {
uint32 blockNumber = safe32(
block.number,
"yflow::_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(uint256 n, string memory errorMessage)
internal
pure
returns (uint32)
{
require(n < 2**32, errorMessage);
return uint32(n);
}
function safe96(uint256 n, string memory errorMessage)
internal
pure
returns (uint96)
{
require(n < 2**96, errorMessage);
return uint96(n);
}
function add96(
uint96 a,
uint96 b,
string memory errorMessage
) internal pure returns (uint96) {
uint96 c = a + b;
require(c >= a, errorMessage);
return c;
}
function sub96(
uint96 a,
uint96 b,
string memory errorMessage
) internal pure returns (uint96) {
require(b <= a, errorMessage);
return a - b;
}
function getChainId() internal pure returns (uint256) {
uint256 chainId;
assembly {
chainId := chainid()
}
return chainId;
}
}
SafeMath.sol 214 lines
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b > a) return (false, 0);
return (true, a - b);
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) return (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b == 0) return (false, 0);
return (true, a / b);
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b == 0) return (false, 0);
return (true, a % b);
}
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a, "SafeMath: subtraction overflow");
return a - b;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) return 0;
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0, "SafeMath: division by zero");
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0, "SafeMath: modulo by zero");
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
return a - b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryDiv}.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
return a % b;
}
}
Read Contract
DELEGATION_TYPEHASH 0xe7a324dc → bytes32
DOMAIN_TYPEHASH 0x20606b70 → bytes32
PERMIT_TYPEHASH 0x30adf81f → bytes32
allowance 0xdd62ed3e → uint256
balanceOf 0x70a08231 → uint256
checkpoints 0xf1127ed8 → uint32, uint96
decimals 0x313ce567 → uint8
delegates 0x587cde1e → address
getCurrentVotes 0xb4b5ea57 → uint96
getPriorVotes 0x782d6fe1 → uint96
minimumTimeBetweenMints 0x5c11d62f → uint32
mintCap 0x76c71ca1 → uint8
minter 0x07546172 → address
mintingAllowedAfter 0x30b36cef → uint256
name 0x06fdde03 → string
nonceOf 0xed2a2d64 → uint256
nonces 0x7ecebe00 → uint256
numCheckpoints 0x6fcfff45 → uint32
symbol 0x95d89b41 → string
totalSupply 0x18160ddd → uint256
Write Contract 8 functions
These functions modify contract state and require a wallet transaction to execute.
approve 0x095ea7b3
address spender
uint256 rawAmount
returns: bool
delegate 0x5c19a95c
address delegatee
delegateBySig 0xc3cda520
address delegatee
uint256 nonce
uint256 expiry
uint8 v
bytes32 r
bytes32 s
mint 0x40c10f19
address dst
uint256 rawAmount
permit 0xd505accf
address owner
address spender
uint256 rawAmount
uint256 deadline
uint8 v
bytes32 r
bytes32 s
setMinter 0xfca3b5aa
address minter_
transfer 0xa9059cbb
address dst
uint256 rawAmount
returns: bool
transferFrom 0x23b872dd
address src
address dst
uint256 rawAmount
returns: bool
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