ERC-20
Overview
Max Total Supply
3,835.950572882477450908 CNCETH-f
Holders
46
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Minimal Proxy Contract for 0xc08550a4cc5333f40e593ecc4c4724808085d304
Contract Name:
Vyper_contract
Compiler Version
vyper:0.3.1
Contract Source Code (Vyper language format)
# @version 0.3.1 """ @title Curve LP Token V5 @author Curve.Fi @notice Base implementation for an LP token provided for supplying liquidity @dev Follows the ERC-20 token standard as defined at https://eips.ethereum.org/EIPS/eip-20 """ from vyper.interfaces import ERC20 implements: ERC20 interface ERC1271: def isValidSignature(_hash: bytes32, _signature: Bytes[65]) -> bytes32: view event Approval: _owner: indexed(address) _spender: indexed(address) _value: uint256 event Transfer: _from: indexed(address) _to: indexed(address) _value: uint256 EIP712_TYPEHASH: constant(bytes32) = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)") PERMIT_TYPEHASH: constant(bytes32) = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)") # keccak256("isValidSignature(bytes32,bytes)")[:4] << 224 ERC1271_MAGIC_VAL: constant(bytes32) = 0x1626ba7e00000000000000000000000000000000000000000000000000000000 VERSION: constant(String[8]) = "v5.0.0" name: public(String[64]) symbol: public(String[32]) DOMAIN_SEPARATOR: public(bytes32) balanceOf: public(HashMap[address, uint256]) allowance: public(HashMap[address, HashMap[address, uint256]]) totalSupply: public(uint256) minter: public(address) nonces: public(HashMap[address, uint256]) @external def __init__(): self.minter = 0x0000000000000000000000000000000000000001 @external def transfer(_to: address, _value: uint256) -> bool: """ @dev Transfer token for a specified address @param _to The address to transfer to. @param _value The amount to be transferred. """ # NOTE: vyper does not allow underflows # so the following subtraction would revert on insufficient balance self.balanceOf[msg.sender] -= _value self.balanceOf[_to] += _value log Transfer(msg.sender, _to, _value) return True @external def transferFrom(_from: address, _to: address, _value: uint256) -> bool: """ @dev Transfer tokens from one address to another. @param _from address The address which you want to send tokens from @param _to address The address which you want to transfer to @param _value uint256 the amount of tokens to be transferred """ self.balanceOf[_from] -= _value self.balanceOf[_to] += _value _allowance: uint256 = self.allowance[_from][msg.sender] if _allowance != MAX_UINT256: self.allowance[_from][msg.sender] = _allowance - _value log Transfer(_from, _to, _value) return True @external def approve(_spender: address, _value: uint256) -> bool: """ @notice Approve the passed address to transfer the specified amount of tokens on behalf of msg.sender @dev Beware that changing an allowance via this method brings the risk that someone may use both the old and new allowance by unfortunate transaction ordering. This may be mitigated with the use of {increaseAllowance} and {decreaseAllowance}. https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 @param _spender The address which will transfer the funds @param _value The amount of tokens that may be transferred @return bool success """ self.allowance[msg.sender][_spender] = _value log Approval(msg.sender, _spender, _value) return True @external def permit( _owner: address, _spender: address, _value: uint256, _deadline: uint256, _v: uint8, _r: bytes32, _s: bytes32 ) -> bool: """ @notice Approves spender by owner's signature to expend owner's tokens. See https://eips.ethereum.org/EIPS/eip-2612. @dev Inspired by https://github.com/yearn/yearn-vaults/blob/main/contracts/Vault.vy#L753-L793 @dev Supports smart contract wallets which implement ERC1271 https://eips.ethereum.org/EIPS/eip-1271 @param _owner The address which is a source of funds and has signed the Permit. @param _spender The address which is allowed to spend the funds. @param _value The amount of tokens to be spent. @param _deadline The timestamp after which the Permit is no longer valid. @param _v The bytes[64] of the valid secp256k1 signature of permit by owner @param _r The bytes[0:32] of the valid secp256k1 signature of permit by owner @param _s The bytes[32:64] of the valid secp256k1 signature of permit by owner @return True, if transaction completes successfully """ assert _owner != ZERO_ADDRESS assert block.timestamp <= _deadline nonce: uint256 = self.nonces[_owner] digest: bytes32 = keccak256( concat( b"\x19\x01", self.DOMAIN_SEPARATOR, keccak256(_abi_encode(PERMIT_TYPEHASH, _owner, _spender, _value, nonce, _deadline)) ) ) if _owner.is_contract: sig: Bytes[65] = concat(_abi_encode(_r, _s), slice(convert(_v, bytes32), 31, 1)) # reentrancy not a concern since this is a staticcall assert ERC1271(_owner).isValidSignature(digest, sig) == ERC1271_MAGIC_VAL else: assert ecrecover(digest, convert(_v, uint256), convert(_r, uint256), convert(_s, uint256)) == _owner self.allowance[_owner][_spender] = _value self.nonces[_owner] = nonce + 1 log Approval(_owner, _spender, _value) return True @external def increaseAllowance(_spender: address, _added_value: uint256) -> bool: """ @notice Increase the allowance granted to `_spender` by the caller @dev This is alternative to {approve} that can be used as a mitigation for the potential race condition @param _spender The address which will transfer the funds @param _added_value The amount of to increase the allowance @return bool success """ allowance: uint256 = self.allowance[msg.sender][_spender] + _added_value self.allowance[msg.sender][_spender] = allowance log Approval(msg.sender, _spender, allowance) return True @external def decreaseAllowance(_spender: address, _subtracted_value: uint256) -> bool: """ @notice Decrease the allowance granted to `_spender` by the caller @dev This is alternative to {approve} that can be used as a mitigation for the potential race condition @param _spender The address which will transfer the funds @param _subtracted_value The amount of to decrease the allowance @return bool success """ allowance: uint256 = self.allowance[msg.sender][_spender] - _subtracted_value self.allowance[msg.sender][_spender] = allowance log Approval(msg.sender, _spender, allowance) return True @external def mint(_to: address, _value: uint256) -> bool: """ @dev Mint an amount of the token and assigns it to an account. This encapsulates the modification of balances such that the proper events are emitted. @param _to The account that will receive the created tokens. @param _value The amount that will be created. """ assert msg.sender == self.minter self.totalSupply += _value self.balanceOf[_to] += _value log Transfer(ZERO_ADDRESS, _to, _value) return True @external def mint_relative(_to: address, frac: uint256) -> uint256: """ @dev Increases supply by factor of (1 + frac/1e18) and mints it for _to """ assert msg.sender == self.minter supply: uint256 = self.totalSupply d_supply: uint256 = supply * frac / 10**18 if d_supply > 0: self.totalSupply = supply + d_supply self.balanceOf[_to] += d_supply log Transfer(ZERO_ADDRESS, _to, d_supply) return d_supply @external def burnFrom(_to: address, _value: uint256) -> bool: """ @dev Burn an amount of the token from a given account. @param _to The account whose tokens will be burned. @param _value The amount that will be burned. """ assert msg.sender == self.minter self.totalSupply -= _value self.balanceOf[_to] -= _value log Transfer(_to, ZERO_ADDRESS, _value) return True @view @external def decimals() -> uint8: """ @notice Get the number of decimals for this token @dev Implemented as a view method to reduce gas costs @return uint8 decimal places """ return 18 @view @external def version() -> String[8]: """ @notice Get the version of this token contract """ return VERSION @external def initialize(_name: String[64], _symbol: String[32], _pool: address): assert self.minter == ZERO_ADDRESS # dev: check that we call it from factory self.name = _name self.symbol = _symbol self.minter = _pool self.DOMAIN_SEPARATOR = keccak256( _abi_encode(EIP712_TYPEHASH, keccak256(_name), keccak256(VERSION), chain.id, self) ) # fire a transfer event so block explorers identify the contract as an ERC20 log Transfer(ZERO_ADDRESS, msg.sender, 0)
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