Overview
Max Total Supply
239,408,476.781161533706831966 KNC
Holders
17,885 ( 0.006%)
Market
Price
$0.43 @ 0.000180 ETH (-3.07%)
Onchain Market Cap
$101,778,289.28
Circulating Supply Market Cap
$72,156,236.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
119 KNCValue
$50.59 ( ~0.0213754140949284 Eth) [0.0000%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | ![]() | KNC-USDT | $0.4255 0.0001798 Eth | $3,632,018.00 8,458,745.250 KNC | 29.6128% |
2 | ![]() | KNC-USDT | $0.4258 0.0001799 Eth | $2,191,291.00 5,096,391.003 KNC | 17.8417% |
3 | ![]() | KNC-USDT | $0.4258 0.0001799 Eth | $1,594,994.00 3,746,186.000 KNC | 13.1148% |
4 | ![]() | KNC-USDT | $0.4253 0.0001796 Eth | $1,215,728.00 2,858,809.960 KNC | 10.0083% |
5 | ![]() | KNC-USDT | $0.4257 0.0001799 Eth | $1,094,915.00 2,551,006.350 KNC | 8.9307% |
6 | ![]() | KNC-USDT | $0.4229 0.0001785 Eth | $585,878.00 1,367,936.100 KNC | 4.7889% |
7 | ![]() | KNC-USDT | $0.4249 0.0001796 Eth | $445,057.00 1,038,063.600 KNC | 3.6341% |
8 | ![]() | KNC-USDT | $0.4354 0.0001728 Eth | $241,725.00 0.000 KNC | 0.0000% |
9 | ![]() | KNC-USDT | $0.4246 0.0001794 Eth | $236,371.00 556,736.970 KNC | 1.9491% |
10 | ![]() | KNC-KRW | $0.4316 0.0001824 Eth | $202,032.00 468,129.799 KNC | 1.6389% |
11 | ![]() | KNC-USDT | $0.4249 0.0001795 Eth | $175,880.00 410,123.300 KNC | 1.4358% |
12 | ![]() | KNC-USDT | $0.4254 0.0001798 Eth | $125,434.00 292,213.800 KNC | 1.0230% |
13 | ![]() | KNC-USDT | $0.4248 0.0001792 Eth | $81,822.00 192,628.097 KNC | 0.6744% |
14 | ![]() | KNC-USDT | $0.4254 0.0001798 Eth | $78,638.00 184,871.230 KNC | 0.6472% |
15 | ![]() | KNC-USDT | $0.4242 0.0001785 Eth | $75,499.00 178,000.900 KNC | 0.6232% |
16 | ![]() | KNC-USDT | $0.4256 0.0001799 Eth | $73,075.00 170,138.661 KNC | 0.5956% |
17 | ![]() | KNC-USDT | $0.4247 0.0001792 Eth | $72,849.00 169,625.400 KNC | 0.5938% |
18 | ![]() | KNC-USDT | $0.4247 0.0001792 Eth | $72,031.00 169,625.400 KNC | 0.5938% |
19 | ![]() | KNC-USDT | $0.4244 0.0001791 Eth | $58,506.00 137,866.064 KNC | 0.4826% |
20 | ![]() | KNC-USDT | $0.4248 0.0001793 Eth | $54,807.00 129,008.500 KNC | 0.4516% |
21 | ![]() | KNC-USD | $0.422 0.0001783 Eth | $48,761.00 115,547.100 KNC | 0.4045% |
22 | ![]() | KNC-USDT | $0.424 0.0001791 Eth | $46,217.00 108,943.300 KNC | 0.3814% |
23 | ![]() | KNC-USD | $0.4238 0.0001790 Eth | $27,540.00 64,992.000 KNC | 0.2275% |
24 | ![]() | KNC-USDT | $0.4257 0.0001799 Eth | $24,777.00 58,207.600 KNC | 0.2038% |
25 | ![]() | KNC-USDT | $0.4248 0.0001793 Eth | $22,299.00 52,489.865 KNC | 0.1838% |
26 | ![]() | KNC-USDT | $0.4252 0.0001794 Eth | $21,910.00 51,522.908 KNC | 0.1804% |
27 | ![]() | KNC-USDT | $0.4245 0.0001794 Eth | $21,822.00 50,992.202 KNC | 0.1785% |
28 | ![]() | KNC-KRW | $0.4312 0.0001819 Eth | $20,192.00 46,828.336 KNC | 0.1639% |
29 | ![]() | KNC-USDT | $0.4248 0.0001793 Eth | $19,096.72 44,825.348 KNC | 0.1569% |
30 | ![]() | KNC-PHP | $0.4242 0.0001790 Eth | $17,858.73 41,365.050 KNC | 0.1448% |
31 | ![]() | KNC-USDT | $0.4248 0.0001793 Eth | $16,482.00 38,795.620 KNC | 0.1358% |
32 | ![]() | KNC-TRY | $0.4266 0.0001800 Eth | $13,906.73 32,310.007 KNC | 0.1131% |
33 | ![]() | KNC-BTC | $0.4243 0.0001792 Eth | $10,042.19 23,753.900 KNC | 0.0832% |
34 | ![]() | KNC-USDT | $0.4245 0.0001791 Eth | $8,822.28 20,582.729 KNC | 0.0721% |
35 | ![]() | KNC-USDT | $0.4251 0.0001794 Eth | $8,362.40 19,459.300 KNC | 0.0681% |
36 | ![]() | KNC-USDT | $0.424 0.0001796 Eth | $7,704.70 17,879.000 KNC | 0.0626% |
37 | ![]() | 0X1C954E8FE737F99F68FA1CCDA3E51EBDB291948C-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39 | $0.7087 0.0003431 Eth | $5,898.07 5.206 0X1C954E8FE737F99F68FA1CCDA3E51EBDB291948C | 0.0000% |
38 | ![]() | KNC-THB | $0.4303 0.0001818 Eth | $5,742.62 13,344.581 KNC | 0.0467% |
39 | ![]() | KNC-BTC | $0.4241 0.0001782 Eth | $5,624.18 14,007.700 KNC | 0.0490% |
40 | ![]() | KNC-AUD | $0.4199 0.0001665 Eth | $5,550.17 13,216.291 KNC | 0.0463% |
41 | ![]() | KNC-USDT | $0.4249 0.0001796 Eth | $4,996.18 11,676.229 KNC | 0.0409% |
42 | ![]() | KNC-USDT | $0.425 0.0001793 Eth | $4,810.74 0.000 KNC | 0.0000% |
43 | ![]() | 0XA00E3A3511AAC35CA78530C85007AFCD31753819-0X4200000000000000000000000000000000000006 | $0.43 0.0001816 Eth | $4,445.32 11,128.311 0XA00E3A3511AAC35CA78530C85007AFCD31753819 | 0.0390% |
44 | ![]() | KNC-EUR | $0.4198 0.0001665 Eth | $3,976.13 9,471.391 KNC | 0.0332% |
45 | ![]() | KNC-USDT | $0.4256 0.0001796 Eth | $3,905.04 9,100.890 KNC | 0.0319% |
46 | ![]() | KNC-GBP | $0.4214 0.0001671 Eth | $3,688.31 8,753.455 KNC | 0.0306% |
47 | ![]() | 0XDEFA4E8A7BCBA345F687A2F1456F5EDD9CE97202-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $0.4239 0.0001791 Eth | $3,376.90 7,886.140 0XDEFA4E8A7BCBA345F687A2F1456F5EDD9CE97202 | 0.0276% |
48 | ![]() | KNC-BTC | $0.4249 0.0001793 Eth | $3,148.81 7,410.190 KNC | 0.0259% |
49 | ![]() | 0X1F32B1C2345538C0C6F582FCB022739C4A194EBB-0XA00E3A3511AAC35CA78530C85007AFCD31753819 | $0.4286 0.0001810 Eth | $2,884.71 1.157 0X1F32B1C2345538C0C6F582FCB022739C4A194EBB | 0.0000% |
50 | ![]() | KNC-USDT | $0.4251 0.0001795 Eth | $2,882.73 6,781.984 KNC | 0.0237% |
51 | ![]() | KNC-USDT | $0.4257 0.0001799 Eth | $2,599.56 6,107.048 KNC | 0.0214% |
52 | ![]() | KNC-USDT | $0.4225 0.0001791 Eth | $2,441.07 5,777.600 KNC | 0.0202% |
53 | ![]() | 0X1C954E8FE737F99F68FA1CCDA3E51EBDB291948C-0XD6DF932A45C0F255F85145F286EA0B292B21C90B | $0.7087 0.0003431 Eth | $2,360.96 10.855 0X1C954E8FE737F99F68FA1CCDA3E51EBDB291948C | 0.0000% |
54 | ![]() | KNC-USD | $0.4258 0.0001799 Eth | $2,073.01 4,868.500 KNC | 0.0170% |
55 | ![]() | KNC-USDT | $0.4239 0.0001790 Eth | $2,042.03 4,672.431 KNC | 0.0164% |
56 | ![]() | KNC-USD | $0.4198 0.0001666 Eth | $1,874.58 4,465.418 KNC | 0.0156% |
57 | ![]() | 0XA00E3A3511AAC35CA78530C85007AFCD31753819-0X7F5C764CBC14F9669B88837CA1490CCA17C31607 | $0.4258 0.0001794 Eth | $1,307.52 3,055.148 0XA00E3A3511AAC35CA78530C85007AFCD31753819 | 0.0107% |
58 | ![]() | KNC-USDT | $0.4209 0.0001787 Eth | $1,305.44 3,101.345 KNC | 0.0109% |
59 | ![]() | KNC-EUR | $0.4226 0.0001785 Eth | $1,298.84 3,073.637 KNC | 0.0108% |
60 | ![]() | KNC-EUR | $0.4226 0.0001786 Eth | $1,280.90 3,012.164 KNC | 0.0105% |
61 | ![]() | KNC-EUR | $0.4242 0.0001793 Eth | $947.99 2,234.729 KNC | 0.0078% |
62 | ![]() | 0X1C954E8FE737F99F68FA1CCDA3E51EBDB291948C-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619 | $0.4198 0.0001774 Eth | $641.86 1,528.578 0X1C954E8FE737F99F68FA1CCDA3E51EBDB291948C | 0.0054% |
63 | ![]() | 0X1C954E8FE737F99F68FA1CCDA3E51EBDB291948C-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270 | $0.421 0.0001772 Eth | $607.27 1,448.833 0X1C954E8FE737F99F68FA1CCDA3E51EBDB291948C | 0.0051% |
64 | ![]() | KNC-USDT | $0.4248 0.0001793 Eth | $581.85 1,369.569 KNC | 0.0048% |
65 | ![]() | 0XE4DDDFE67E7164B0FE14E218D80DC4C08EDC01CB-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1 | $0.4208 0.0001778 Eth | $561.07 1,342.710 0XE4DDDFE67E7164B0FE14E218D80DC4C08EDC01CB | 0.0047% |
66 | ![]() | KNC-INR | $0.4452 0.0001879 Eth | $509.89 1,133.917 KNC | 0.0040% |
67 | ![]() | 0XFE56D5892BDFFC7BF58F2E84BE1B2C32D21C308B-0X2170ED0880AC9A755FD29B2688956BD959F933F8 | $0.4218 0.0001775 Eth | $487.22 1,266.958 0XFE56D5892BDFFC7BF58F2E84BE1B2C32D21C308B | 0.0044% |
68 | ![]() | 0XDD974D5C2E2928DEA5F71B9825B8B646686BD200-0XDEFA4E8A7BCBA345F687A2F1456F5EDD9CE97202 | $0.756 0.0002154 Eth | $429.45 977.366 0XDD974D5C2E2928DEA5F71B9825B8B646686BD200 | 0.0034% |
69 | ![]() | 0X1C954E8FE737F99F68FA1CCDA3E51EBDB291948C-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619 | $0.4223 0.0001777 Eth | $396.18 940.152 0X1C954E8FE737F99F68FA1CCDA3E51EBDB291948C | 0.0033% |
70 | ![]() | 0XDEFA4E8A7BCBA345F687A2F1456F5EDD9CE97202-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $0.4171 0.0001760 Eth | $278.99 671.882 0XDEFA4E8A7BCBA345F687A2F1456F5EDD9CE97202 | 0.0024% |
71 | ![]() | 0XE4DDDFE67E7164B0FE14E218D80DC4C08EDC01CB-0XFF970A61A04B1CA14834A43F5DE4533EBDDB5CC8 | $0.422 0.0001780 Eth | $269.67 631.353 0XE4DDDFE67E7164B0FE14E218D80DC4C08EDC01CB | 0.0022% |
72 | ![]() | KNC-USD | $0.4241 0.0001791 Eth | $187.40 441.866 KNC | 0.0015% |
73 | ![]() | KNC-USDC | $0.4331 0.0001818 Eth | $181.64 419.367 KNC | 0.0015% |
74 | ![]() | KNC-BTC | $0.4386 0.0001737 Eth | $137.65 313.827 KNC | 0.0011% |
75 | ![]() | KNC-ETH | $0.4243 0.0001791 Eth | $121.17 285.545 KNC | 0.0010% |
76 | ![]() | 0X5979D7B546E38E414F7E9822514BE443A4800529-0XE4DDDFE67E7164B0FE14E218D80DC4C08EDC01CB | $0.4208 0.0001778 Eth | $93.00 0.033 0X5979D7B546E38E414F7E9822514BE443A4800529 | 0.0000% |
77 | ![]() | KNC-USD | $0.4386 0.0001844 Eth | $87.71 200.000 KNC | 0.0007% |
78 | ![]() | 0X1C954E8FE737F99F68FA1CCDA3E51EBDB291948C-0XC2132D05D31C914A87C6611C10748AEB04B58E8F | $0.4389 0.0001850 Eth | $79.98 182.238 0X1C954E8FE737F99F68FA1CCDA3E51EBDB291948C | 0.0006% |
79 | ![]() | KNC-USDT | $0.4143 0.0001748 Eth | $62.51 150.896 KNC | 0.0005% |
80 | ![]() | KNC-BTC | $0.4227 0.0001722 Eth | $60.91 144.100 KNC | 0.0005% |
81 | ![]() | KNC-BTC | $0.4227 0.0001722 Eth | $60.90 144.100 KNC | 0.0005% |
82 | ![]() | 0X03B54A6E9A984069379FAE1A4FC4DBAE93B3BCCD-0X1C954E8FE737F99F68FA1CCDA3E51EBDB291948C | $0.4193 0.0001772 Eth | $60.67 0.022 0X03B54A6E9A984069379FAE1A4FC4DBAE93B3BCCD | 0.0000% |
83 | ![]() | KNC-BRL | $0.4181 0.0001750 Eth | $51.15 122.341 KNC | 0.0004% |
84 | ![]() | KNC-BTC | $0.4227 0.0001784 Eth | $48.52 114.801 KNC | 0.0004% |
85 | ![]() | KNC-BTC | $0.4249 0.0001793 Eth | $46.28 109.331 KNC | 0.0004% |
86 | ![]() | KNC-ETH | $0.4235 0.0001789 Eth | $44.23 104.094 KNC | 0.0004% |
87 | ![]() | 0XDEFA4E8A7BCBA345F687A2F1456F5EDD9CE97202-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $0.4259 0.0001761 Eth | $29.79 69.955 0XDEFA4E8A7BCBA345F687A2F1456F5EDD9CE97202 | 0.0002% |
88 | ![]() | KNC-INR | $0.4503 0.0001902 Eth | $29.78 66.135 KNC | 0.0002% |
89 | ![]() | KNC-INR | $0.4463 0.0001884 Eth | $28.17 0.000 KNC | 0.0000% |
90 | ![]() | KNC-EUR | $0.4099 0.0001668 Eth | $27.70 67.568 KNC | 0.0002% |
91 | ![]() | 0XDEFA4E8A7BCBA345F687A2F1456F5EDD9CE97202-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $0.4241 0.0001791 Eth | $19.34 45.445 0XDEFA4E8A7BCBA345F687A2F1456F5EDD9CE97202 | 0.0002% |
92 | ![]() | KNC-USDC | $0.4197 0.0001667 Eth | $19.14 45.600 KNC | 0.0002% |
93 | ![]() | KNC-USDC | $0.4196 0.0001667 Eth | $19.13 45.600 KNC | 0.0002% |
94 | ![]() | 0X4200000000000000000000000000000000000042-0XA00E3A3511AAC35CA78530C85007AFCD31753819 | $0.4312 0.0001816 Eth | $13.33 9.923 0X4200000000000000000000000000000000000042 | 0.0000% |
95 | ![]() | KNC-IDR | $0.4256 0.0001796 Eth | $10.50 22.560 KNC | 0.0001% |
96 | ![]() | KNC-BTC | $0.4246 0.0001793 Eth | $6.47 15.237 KNC | 0.0001% |
97 | ![]() | 0X3B2F62D42DB19B30588648BF1C184865D4C3B1D6-0XE5D7C2A44FFDDF6B295A15C148167DAAAF5CF34F | $0.4206 0.0001742 Eth | $4.52 10.681 0X3B2F62D42DB19B30588648BF1C184865D4C3B1D6 | 0.0000% |
98 | ![]() | 0X39FC9E94CAEACB435842FADEDECB783589F50F5F-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7 | $0.2612 0.0001102 Eth | $1.85 7.078 0X39FC9E94CAEACB435842FADEDECB783589F50F5F | 0.0000% |
99 | ![]() | KNC-ETH | $0.4164 0.0001759 Eth | $1.66 3.991 KNC | 0.0000% |
100 | ![]() | KNC-BRL | $0.4289 0.0001810 Eth | $0.3437 0.795 KNC | 0.0000% |
Similar Match Source Code This contract matches the deployed Bytecode of the Source Code for Contract 0xaC494b69...56048DD42 The constructor portion of the code might be different and could alter the actual behaviour of the contract
Contract Name:
AdminUpgradeabilityProxy
Compiler Version
v0.6.8+commit.0bbfe453
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion, Audited
Contract Source Code (Solidity Standard Json-Input format)Audit Report
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import './UpgradeabilityProxy.sol'; /** * @title AdminUpgradeabilityProxy * @dev This contract combines an upgradeability proxy with an authorization * mechanism for administrative tasks. * All external functions in this contract must be guarded by the * `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity * feature proposal that would enable this to be done automatically. */ contract AdminUpgradeabilityProxy is UpgradeabilityProxy { /** * Contract constructor. * @param _logic address of the initial implementation. * @param _admin Address of the proxy administrator. * @param _data Data to send as msg.data to the implementation to initialize the proxied contract. * It should include the signature and the parameters of the function to be called, as described in * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding. * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped. */ constructor(address _logic, address _admin, bytes memory _data) UpgradeabilityProxy(_logic, _data) public payable { assert(ADMIN_SLOT == bytes32(uint256(keccak256('eip1967.proxy.admin')) - 1)); _setAdmin(_admin); } /** * @dev Emitted when the administration has been transferred. * @param previousAdmin Address of the previous admin. * @param newAdmin Address of the new admin. */ event AdminChanged(address previousAdmin, address newAdmin); /** * @dev Storage slot with the admin of the contract. * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is * validated in the constructor. */ bytes32 internal constant ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103; /** * @dev Modifier to check whether the `msg.sender` is the admin. * If it is, it will run the function. Otherwise, it will delegate the call * to the implementation. */ modifier ifAdmin() { if (msg.sender == _admin()) { _; } else { _fallback(); } } /** * @return The address of the proxy admin. */ function admin() external ifAdmin returns (address) { return _admin(); } /** * @return The address of the implementation. */ function implementation() external ifAdmin returns (address) { return _implementation(); } /** * @dev Changes the admin of the proxy. * Only the current admin can call this function. * @param newAdmin Address to transfer proxy administration to. */ function changeAdmin(address newAdmin) external ifAdmin { require(newAdmin != address(0), "Cannot change the admin of a proxy to the zero address"); emit AdminChanged(_admin(), newAdmin); _setAdmin(newAdmin); } /** * @dev Upgrade the backing implementation of the proxy. * Only the admin can call this function. * @param newImplementation Address of the new implementation. */ function upgradeTo(address newImplementation) external ifAdmin { _upgradeTo(newImplementation); } /** * @dev Upgrade the backing implementation of the proxy and call a function * on the new implementation. * This is useful to initialize the proxied contract. * @param newImplementation Address of the new implementation. * @param data Data to send as msg.data in the low level call. * It should include the signature and the parameters of the function to be called, as described in * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding. */ function upgradeToAndCall(address newImplementation, bytes calldata data) payable external ifAdmin { _upgradeTo(newImplementation); (bool success,) = newImplementation.delegatecall(data); require(success); } /** * @return adm The admin slot. */ function _admin() internal view returns (address adm) { bytes32 slot = ADMIN_SLOT; assembly { adm := sload(slot) } } /** * @dev Sets the address of the proxy admin. * @param newAdmin Address of the new proxy admin. */ function _setAdmin(address newAdmin) internal { bytes32 slot = ADMIN_SLOT; assembly { sstore(slot, newAdmin) } } /** * @dev Only fall back when the sender is not the admin. */ function _willFallback() internal override virtual { require(msg.sender != _admin(), "Cannot call fallback function from the proxy admin"); super._willFallback(); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import './Proxy.sol'; import '@openzeppelin/contracts/utils/Address.sol'; /** * @title UpgradeabilityProxy * @dev This contract implements a proxy that allows to change the * implementation address to which it will delegate. * Such a change is called an implementation upgrade. */ contract UpgradeabilityProxy is Proxy { /** * @dev Contract constructor. * @param _logic Address of the initial implementation. * @param _data Data to send as msg.data to the implementation to initialize the proxied contract. * It should include the signature and the parameters of the function to be called, as described in * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding. * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped. */ constructor(address _logic, bytes memory _data) public payable { assert(IMPLEMENTATION_SLOT == bytes32(uint256(keccak256('eip1967.proxy.implementation')) - 1)); _setImplementation(_logic); if(_data.length > 0) { (bool success,) = _logic.delegatecall(_data); require(success); } } /** * @dev Emitted when the implementation is upgraded. * @param implementation Address of the new implementation. */ event Upgraded(address indexed implementation); /** * @dev Storage slot with the address of the current implementation. * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is * validated in the constructor. */ bytes32 internal constant IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc; /** * @dev Returns the current implementation. * @return impl Address of the current implementation */ function _implementation() internal override view returns (address impl) { bytes32 slot = IMPLEMENTATION_SLOT; assembly { impl := sload(slot) } } /** * @dev Upgrades the proxy to a new implementation. * @param newImplementation Address of the new implementation. */ function _upgradeTo(address newImplementation) internal { _setImplementation(newImplementation); emit Upgraded(newImplementation); } /** * @dev Sets the implementation address of the proxy. * @param newImplementation Address of the new implementation. */ function _setImplementation(address newImplementation) internal { require(Address.isContract(newImplementation), "Cannot set a proxy implementation to a non-contract address"); bytes32 slot = IMPLEMENTATION_SLOT; assembly { sstore(slot, newImplementation) } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @title Proxy * @dev Implements delegation of calls to other contracts, with proper * forwarding of return values and bubbling of failures. * It defines a fallback function that delegates all calls to the address * returned by the abstract _implementation() internal function. */ abstract contract Proxy { /** * @dev Fallback function. * Implemented entirely in `_fallback`. */ fallback () payable external { _fallback(); } /** * @dev Receive function. * Implemented entirely in `_fallback`. */ receive () payable external { _fallback(); } /** * @return The Address of the implementation. */ function _implementation() internal virtual view returns (address); /** * @dev Delegates execution to an implementation contract. * This is a low level function that doesn't return to its internal call site. * It will return to the external caller whatever the implementation returns. * @param implementation Address to delegate. */ function _delegate(address implementation) internal { assembly { // Copy msg.data. We take full control of memory in this inline assembly // block because it will not return to Solidity code. We overwrite the // Solidity scratch pad at memory position 0. calldatacopy(0, 0, calldatasize()) // Call the implementation. // out and outsize are 0 because we don't know the size yet. let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0) // Copy the returned data. returndatacopy(0, 0, returndatasize()) switch result // delegatecall returns 0 on error. case 0 { revert(0, returndatasize()) } default { return(0, returndatasize()) } } } /** * @dev Function that is run as the first thing in the fallback function. * Can be redefined in derived contracts to add functionality. * Redefinitions must call super._willFallback(). */ function _willFallback() internal virtual { } /** * @dev fallback implementation. * Extracted to enable manual triggering. */ function _fallback() internal { _willFallback(); _delegate(_implementation()); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.2 <0.8.0; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{ value: amount }(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: value }(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } }, "libraries": {} }
Contract Security Audit
- Hacken - May 18th, 2021 - Security Audit Report
[{"inputs":[{"internalType":"address","name":"_logic","type":"address"},{"internalType":"address","name":"_admin","type":"address"},{"internalType":"bytes","name":"_data","type":"bytes"}],"stateMutability":"payable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"previousAdmin","type":"address"},{"indexed":false,"internalType":"address","name":"newAdmin","type":"address"}],"name":"AdminChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"implementation","type":"address"}],"name":"Upgraded","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"admin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newAdmin","type":"address"}],"name":"changeAdmin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"implementation","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"}],"name":"upgradeTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"upgradeToAndCall","outputs":[],"stateMutability":"payable","type":"function"},{"stateMutability":"payable","type":"receive"}]
Contract Creation Code
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Deployed Bytecode
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