Overview
Max Total Supply
3,485,003.208736930378122263 wstETH
Holders
13,959 ( 0.136%)
Market
Price
$2,695.75 @ 1.177213 ETH (+0.81%)
Onchain Market Cap
$9,394,697,399.95
Circulating Supply Market Cap
$9,412,270,929.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
0.00060173414867446 wstETHValue
$1.62 ( ~0.000707441203283174 Eth) [0.0000%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $2,695.30 1.1770570 Eth | $77,748,667.00 28,852.078 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.2505% |
2 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $2,699.37 1.1779480 Eth | $24,825,653.00 9,202.364 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.0799% |
3 | ![]() | 0XD9A442856C234A39A81A089C06451EBAA4306A72-0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | $2,697.10 1.1769570 Eth | $9,276,516.00 4,033.758 0XD9A442856C234A39A81A089C06451EBAA4306A72 | 0.0350% |
4 | ![]() | 0X5979D7B546E38E414F7E9822514BE443A4800529-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1 | $2,697.73 1.1766760 Eth | $8,044,056.00 2,981.332 0X5979D7B546E38E414F7E9822514BE443A4800529 | 0.0259% |
5 | ![]() | 0X1F32B1C2345538C0C6F582FCB022739C4A194EBB-0X4200000000000000000000000000000000000006 | $2,697.75 1.1766870 Eth | $7,813,946.00 2,897.940 0X1F32B1C2345538C0C6F582FCB022739C4A194EBB | 0.0252% |
6 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0XD9A442856C234A39A81A089C06451EBAA4306A72 | $2,699.27 1.1779060 Eth | $5,783,491.00 2,095.640 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.0182% |
7 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0X7FC66500C84A76AD7E9C93437BFC5AC33E2DDAE9 | $2,699.27 1.1779060 Eth | $4,963,552.00 1,832.992 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.0159% |
8 | ![]() | 0X35751007A407CA6FEFFE80B3CB397736D2CF4DBE-0X5979D7B546E38E414F7E9822514BE443A4800529 | $2,696.85 1.1768490 Eth | $4,784,449.00 1,992.504 0X35751007A407CA6FEFFE80B3CB397736D2CF4DBE | 0.0173% |
9 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0XBF5495EFE5DB9CE00F80364C8B423567E58D2110 | $2,698.23 1.1768940 Eth | $4,732,311.00 1,751.848 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.0152% |
10 | ![]() | 0X5979D7B546E38E414F7E9822514BE443A4800529-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1 | $2,697.73 1.1766760 Eth | $4,166,166.00 1,544.165 0X5979D7B546E38E414F7E9822514BE443A4800529 | 0.0134% |
11 | ![]() | 0X5979D7B546E38E414F7E9822514BE443A4800529-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1 | $2,697.96 1.1773320 Eth | $3,763,355.00 1,394.980 0X5979D7B546E38E414F7E9822514BE443A4800529 | 0.0121% |
12 | ![]() | 0X2416092F143378750BB29B79ED961AB195CCEEA5-0X5979D7B546E38E414F7E9822514BE443A4800529 | $2,697.47 1.1771210 Eth | $2,094,956.00 900.167 0X2416092F143378750BB29B79ED961AB195CCEEA5 | 0.0078% |
13 | ![]() | 0XC1CBA3FCEA344F92D9239C08C0568F6F2F0EE452-0X4200000000000000000000000000000000000006 | $2,692.31 1.1757550 Eth | $2,008,905.00 746.160 0XC1CBA3FCEA344F92D9239C08C0568F6F2F0EE452 | 0.0065% |
14 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $2,696.28 1.1760460 Eth | $1,871,953.00 694.434 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.0060% |
15 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0XAC3E018457B222D93114458476F3E3416ABBE38F | $2,699.27 1.1779060 Eth | $1,546,442.00 572.467 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.0050% |
16 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $2,695.87 1.1758640 Eth | $1,462,094.00 542.570 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.0047% |
17 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0XAC3E018457B222D93114458476F3E3416ABBE38F | $2,699.32 1.1779260 Eth | $1,375,336.00 508.659 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.0044% |
18 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0XAE78736CD615F374D3085123A210448E74FC6393 | $2,694.37 1.1766520 Eth | $1,322,487.00 491.029 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.0043% |
19 | ![]() | 0XC1CBA3FCEA344F92D9239C08C0568F6F2F0EE452-0X4200000000000000000000000000000000000006 | $2,691.38 1.1772080 Eth | $1,237,053.00 459.565 0XC1CBA3FCEA344F92D9239C08C0568F6F2F0EE452 | 0.0040% |
20 | ![]() | 0X5979D7B546E38E414F7E9822514BE443A4800529-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1 | $2,697.44 1.1771050 Eth | $889,499.00 329.728 0X5979D7B546E38E414F7E9822514BE443A4800529 | 0.0029% |
21 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0XCD5FE23C85820F7B72D0926FC9B05B43E359B7EE | $2,699.96 1.1776490 Eth | $882,360.00 327.003 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.0028% |
22 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0XAE78736CD615F374D3085123A210448E74FC6393 | $2,700.93 1.1786280 Eth | $857,252.00 328.512 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.0029% |
23 | ![]() | 0X5979D7B546E38E414F7E9822514BE443A4800529-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1 | $2,697.46 1.1771160 Eth | $723,943.00 268.348 0X5979D7B546E38E414F7E9822514BE443A4800529 | 0.0023% |
24 | ![]() | 0X0B2C639C533813F4AA9D7837CAF62653D097FF85-0X1F32B1C2345538C0C6F582FCB022739C4A194EBB | $2,693.34 1.1762050 Eth | $718,698.00 702,295.729 0X0B2C639C533813F4AA9D7837CAF62653D097FF85 | 6.0968% |
25 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0XAC3E018457B222D93114458476F3E3416ABBE38F | $2,699.27 1.1779060 Eth | $581,401.00 215.077 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.0019% |
26 | ![]() | 0X1F32B1C2345538C0C6F582FCB022739C4A194EBB-0X4200000000000000000000000000000000000006 | $2,704.71 1.1802810 Eth | $546,544.00 202.157 0X1F32B1C2345538C0C6F582FCB022739C4A194EBB | 0.0018% |
27 | ![]() | 0X5979D7B546E38E414F7E9822514BE443A4800529-0XAF88D065E77C8CC2239327C5EDB3A432268E5831 | $2,698.95 1.1777640 Eth | $498,745.00 189.396 0X5979D7B546E38E414F7E9822514BE443A4800529 | 0.0016% |
28 | ![]() | 0XCD5FE23C85820F7B72D0926FC9B05B43E359B7EE-0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | $2,693.89 1.1750030 Eth | $419,652.00 175.147 0XCD5FE23C85820F7B72D0926FC9B05B43E359B7EE | 0.0015% |
29 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $2,688.52 1.1767860 Eth | $305,841.00 113.758 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.0010% |
30 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0XBE9895146F7AF43049CA1C1AE358B0541EA49704 | $2,699.27 1.1779060 Eth | $207,612.00 76.968 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.0007% |
31 | ![]() | 0X1F32B1C2345538C0C6F582FCB022739C4A194EBB-0X4200000000000000000000000000000000000006 | $2,702.25 1.1764510 Eth | $192,194.00 71.145 0X1F32B1C2345538C0C6F582FCB022739C4A194EBB | 0.0006% |
32 | ![]() | 0X8C9532A60E0E7C6BBD2B2C1303F63ACE1C3E9811-0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | $2,693.85 1.1755420 Eth | $187,826.00 69.893 0X8C9532A60E0E7C6BBD2B2C1303F63ACE1C3E9811 | 0.0006% |
33 | ![]() | 0XB79DD08EA68A908A97220C76D19A6AA9CBDE4376-0XC1CBA3FCEA344F92D9239C08C0568F6F2F0EE452 | $2,692.31 1.1757550 Eth | $162,855.00 159,196.968 0XB79DD08EA68A908A97220C76D19A6AA9CBDE4376 | 1.3820% |
34 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0XAE78736CD615F374D3085123A210448E74FC6393 | $2,699.71 1.1780970 Eth | $150,234.00 55.684 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.0005% |
35 | ![]() | 0X1F32B1C2345538C0C6F582FCB022739C4A194EBB-0X4200000000000000000000000000000000000042 | $2,692.17 1.1756920 Eth | $140,683.00 51.343 0X1F32B1C2345538C0C6F582FCB022739C4A194EBB | 0.0004% |
36 | ![]() | 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $2,699.31 1.1779240 Eth | $136,785.00 50.685 0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | 0.0004% |
37 | ![]() | 0X8C9532A60E0E7C6BBD2B2C1303F63ACE1C3E9811-0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | $2,695.30 1.1770570 Eth | $123,161.00 45.786 0X8C9532A60E0E7C6BBD2B2C1303F63ACE1C3E9811 | 0.0004% |
38 | ![]() | 0X5979D7B546E38E414F7E9822514BE443A4800529-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1 | $2,697.91 1.1767540 Eth | $113,927.00 42.230 0X5979D7B546E38E414F7E9822514BE443A4800529 | 0.0004% |
39 | ![]() | 0X5979D7B546E38E414F7E9822514BE443A4800529-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1 | $2,698.01 1.1773540 Eth | $112,657.00 41.758 0X5979D7B546E38E414F7E9822514BE443A4800529 | 0.0004% |
40 | ![]() | 0X5979D7B546E38E414F7E9822514BE443A4800529-0XEC70DCB4A1EFA46B8F2D97C310C9C4790BA5FFA8 | $2,697.47 1.1771210 Eth | $111,891.00 41.475 0X5979D7B546E38E414F7E9822514BE443A4800529 | 0.0004% |
41 | ![]() | 0XF939E0A03FB07F59A73314E73794BE0E57AC1B4E-0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | $2,697.10 1.1769570 Eth | $103,913.00 102,627.044 0XF939E0A03FB07F59A73314E73794BE0E57AC1B4E | 0.8909% |
42 | ![]() | 0X5979D7B546E38E414F7E9822514BE443A4800529-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1 | $2,698.56 1.1776590 Eth | $92,573.00 34.308 0X5979D7B546E38E414F7E9822514BE443A4800529 | 0.0003% |
43 | ![]() | 0X5979D7B546E38E414F7E9822514BE443A4800529-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1 | $2,697.56 1.1771600 Eth | $91,138.00 33.777 0X5979D7B546E38E414F7E9822514BE443A4800529 | 0.0003% |
44 | ![]() | 0XB5BEDD42000B71FDDE22D3EE8A79BD49A568FC8F-0XE5D7C2A44FFDDF6B295A15C148167DAAAF5CF34F | $2,697.83 1.1767200 Eth | $84,844.00 31.451 0XB5BEDD42000B71FDDE22D3EE8A79BD49A568FC8F | 0.0003% |
45 | ![]() | 0X1F32B1C2345538C0C6F582FCB022739C4A194EBB-0X7F5C764CBC14F9669B88837CA1490CCA17C31607 | $2,702.79 1.1794430 Eth | $72,207.00 27.516 0X1F32B1C2345538C0C6F582FCB022739C4A194EBB | 0.0002% |
46 | ![]() | 0XC1CBA3FCEA344F92D9239C08C0568F6F2F0EE452-0X4200000000000000000000000000000000000006 | $2,692.29 1.1757450 Eth | $68,057.00 25.276 0XC1CBA3FCEA344F92D9239C08C0568F6F2F0EE452 | 0.0002% |
47 | ![]() | 0X03B54A6E9A984069379FAE1A4FC4DBAE93B3BCCD-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619 | $2,696.85 1.1762910 Eth | $66,808.00 24.775 0X03B54A6E9A984069379FAE1A4FC4DBAE93B3BCCD | 0.0002% |
48 | ![]() | 0X4186BFC76E2E237523CBC30FD220FE055156B41F-0X5979D7B546E38E414F7E9822514BE443A4800529 | $2,697.96 1.1773320 Eth | $65,835.00 28.098 0X4186BFC76E2E237523CBC30FD220FE055156B41F | 0.0002% |
49 | ![]() | 0XB5BEDD42000B71FDDE22D3EE8A79BD49A568FC8F-0XE5D7C2A44FFDDF6B295A15C148167DAAAF5CF34F | $2,693.42 1.1762390 Eth | $54,289.00 20.159 0XB5BEDD42000B71FDDE22D3EE8A79BD49A568FC8F | 0.0002% |
50 | ![]() | 0X44108F0223A3C3028F5FE7AEC7F9BB2E66BEF82F-0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | $2,697.10 1.1769570 Eth | $50,584.00 185,928.859 0X44108F0223A3C3028F5FE7AEC7F9BB2E66BEF82F | 1.6141% |
51 | ![]() | 0X40D16FC0246AD3160CCC09B8D0D3A2CD28AE6C2F-0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | $2,697.10 1.1769570 Eth | $44,408.00 42,908.513 0X40D16FC0246AD3160CCC09B8D0D3A2CD28AE6C2F | 0.3725% |
52 | ![]() | 0X40D16FC0246AD3160CCC09B8D0D3A2CD28AE6C2F-0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | $2,697.10 1.1769570 Eth | $36,812.00 35,433.093 0X40D16FC0246AD3160CCC09B8D0D3A2CD28AE6C2F | 0.3076% |
53 | ![]() | 0XB5BEDD42000B71FDDE22D3EE8A79BD49A568FC8F-0XE5D7C2A44FFDDF6B295A15C148167DAAAF5CF34F | $2,706.43 1.1780930 Eth | $33,578.00 12.408 0XB5BEDD42000B71FDDE22D3EE8A79BD49A568FC8F | 0.0001% |
54 | ![]() | 0X5979D7B546E38E414F7E9822514BE443A4800529-0XFF970A61A04B1CA14834A43F5DE4533EBDDB5CC8 | $2,698.36 1.1775090 Eth | $33,139.00 12.488 0X5979D7B546E38E414F7E9822514BE443A4800529 | 0.0001% |
55 | ![]() | 0XAFB89A09D82FBDE58F18AC6437B3FC81724E4DF6-0XC1CBA3FCEA344F92D9239C08C0568F6F2F0EE452 | $2,691.38 1.1772080 Eth | $32,136.00 10,162,690.110 0XAFB89A09D82FBDE58F18AC6437B3FC81724E4DF6 | 88.2246% |
56 | ![]() | 0X703B52F2B28FEBCB60E1372858AF5B18849FE867-0X5AEA5775959FBC2557CC8789BC1BF90A239D9A91 | $2,707.82 1.1757000 Eth | $24,176.00 9.072 0X703B52F2B28FEBCB60E1372858AF5B18849FE867 | 0.0001% |
57 | ![]() | 0X03B54A6E9A984069379FAE1A4FC4DBAE93B3BCCD-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619 | $2,696.84 1.1768470 Eth | $16,080.26 5.962 0X03B54A6E9A984069379FAE1A4FC4DBAE93B3BCCD | 0.0001% |
58 | ![]() | 0X703B52F2B28FEBCB60E1372858AF5B18849FE867-0X5AEA5775959FBC2557CC8789BC1BF90A239D9A91 | $2,731.13 1.1858960 Eth | $15,891.89 5.819 0X703B52F2B28FEBCB60E1372858AF5B18849FE867 | 0.0001% |
59 | ![]() | 0X2AE3F1EC7F1F5012CFEAB0185BFC7AA3CF0DEC22-0XC1CBA3FCEA344F92D9239C08C0568F6F2F0EE452 | $2,691.09 1.1737800 Eth | $15,243.54 6.177 0X2AE3F1EC7F1F5012CFEAB0185BFC7AA3CF0DEC22 | 0.0001% |
60 | ![]() | 0X18084FBA666A33D37592FA2633FD49A74DD93A88-0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0 | $2,697.10 1.1769570 Eth | $13,951.44 0.255 0X18084FBA666A33D37592FA2633FD49A74DD93A88 | 0.0000% |
61 | ![]() | UNTRN-FACTORY/NEUTRON1UG740QRKQUXZRK2HH29QRLX3SKTKFML3JE7JUUSC2TE7XMVSSCNS0N2WRY/WSTETH | $2,694.31 1.1728180 Eth | $13,869.99 41,591.716 UNTRN | 0.3611% |
62 | ![]() | 0X5979D7B546E38E414F7E9822514BE443A4800529-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1 | $2,702.49 1.1765540 Eth | $11,135.70 4.120 0X5979D7B546E38E414F7E9822514BE443A4800529 | 0.0000% |
63 | ![]() | 0X0B2C639C533813F4AA9D7837CAF62653D097FF85-0X1F32B1C2345538C0C6F582FCB022739C4A194EBB | $2,708.74 1.1761710 Eth | $10,275.34 9,951.594 0X0B2C639C533813F4AA9D7837CAF62653D097FF85 | 0.0864% |
64 | ![]() | 0X5979D7B546E38E414F7E9822514BE443A4800529-0X5D3A1FF2B6BAB83B63CD9AD0787074081A52EF34 | $2,691.92 1.1777630 Eth | $9,069.21 3.423 0X5979D7B546E38E414F7E9822514BE443A4800529 | 0.0000% |
65 | ![]() | 0X1F32B1C2345538C0C6F582FCB022739C4A194EBB-0X484C2D6E3CDD945A8B2DF735E079178C1036578C | $2,698.23 1.1775120 Eth | $8,057.67 2.988 0X1F32B1C2345538C0C6F582FCB022739C4A194EBB | 0.0000% |
66 | ![]() | 0X703B52F2B28FEBCB60E1372858AF5B18849FE867-0X5AEA5775959FBC2557CC8789BC1BF90A239D9A91 | $2,699.81 1.1753900 Eth | $7,851.63 2.896 0X703B52F2B28FEBCB60E1372858AF5B18849FE867 | 0.0000% |
67 | ![]() | 0XBC7B1FF1C6989F006A1185318ED4E7B5796E66E1-0X1F32B1C2345538C0C6F582FCB022739C4A194EBB | $2,696.35 1.1762690 Eth | $7,171.65 2,688.781 0XBC7B1FF1C6989F006A1185318ED4E7B5796E66E1 | 0.0233% |
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Contract Name:
WstETH
Compiler Version
v0.6.12+commit.27d51765
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2021-08-14 */ // SPDX-License-Identifier: MIT AND GPL-3.0 // File: @openzeppelin/contracts/utils/Context.sol pragma solidity >=0.6.0 <0.8.0; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with GSN meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address payable) { return msg.sender; } function _msgData() internal view virtual returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } } // File: @openzeppelin/contracts/token/ERC20/IERC20.sol pragma solidity >=0.6.0 <0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); } // File: @openzeppelin/contracts/math/SafeMath.sol 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; } } // File: @openzeppelin/contracts/token/ERC20/ERC20.sol pragma solidity >=0.6.0 <0.8.0; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin guidelines: functions revert instead * of returning `false` on failure. This behavior is nonetheless conventional * and does not conflict with the expectations of ERC20 applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20 { using SafeMath for uint256; mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; uint8 private _decimals; /** * @dev Sets the values for {name} and {symbol}, initializes {decimals} with * a default value of 18. * * To select a different value for {decimals}, use {_setupDecimals}. * * All three of these values are immutable: they can only be set once during * construction. */ constructor (string memory name_, string memory symbol_) public { _name = name_; _symbol = symbol_; _decimals = 18; } /** * @dev Returns the name of the token. */ function name() public view virtual returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5,05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is * called. * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * Requirements: * * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) { _transfer(sender, recipient, amount); _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance")); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue)); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer(address sender, address recipient, uint256 amount) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance"); _balances[recipient] = _balances[recipient].add(amount); emit Transfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `to` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); emit Transfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance"); _totalSupply = _totalSupply.sub(amount); emit Transfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve(address owner, address spender, uint256 amount) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Sets {decimals} to a value other than the default one of 18. * * WARNING: This function should only be called from the constructor. Most * applications that interact with token contracts will not expect * {decimals} to ever change, and may work incorrectly if it does. */ function _setupDecimals(uint8 decimals_) internal virtual { _decimals = decimals_; } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be to transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { } } // File: @openzeppelin/contracts/drafts/IERC20Permit.sol pragma solidity >=0.6.0 <0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over `owner`'s tokens, * given `owner`'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for `permit`, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); } // File: @openzeppelin/contracts/cryptography/ECDSA.sol pragma solidity >=0.6.0 <0.8.0; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { // Check the signature length if (signature.length != 65) { revert("ECDSA: invalid signature length"); } // Divide the signature in r, s and v variables bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. // solhint-disable-next-line no-inline-assembly assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return recover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover-bytes32-bytes-} that receives the `v`, * `r` and `s` signature fields separately. */ function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) { // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value"); require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value"); // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); require(signer != address(0), "ECDSA: invalid signature"); return signer; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * replicates the behavior of the * https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign[`eth_sign`] * JSON-RPC method. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } } // File: @openzeppelin/contracts/utils/Counters.sol pragma solidity >=0.6.0 <0.8.0; /** * @title Counters * @author Matt Condon (@shrugs) * @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number * of elements in a mapping, issuing ERC721 ids, or counting request ids. * * Include with `using Counters for Counters.Counter;` * Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the {SafeMath} * overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never * directly accessed. */ library Counters { using SafeMath for uint256; struct Counter { // This variable should never be directly accessed by users of the library: interactions must be restricted to // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add // this feature: see https://github.com/ethereum/solidity/issues/4637 uint256 _value; // default: 0 } function current(Counter storage counter) internal view returns (uint256) { return counter._value; } function increment(Counter storage counter) internal { // The {SafeMath} overflow check can be skipped here, see the comment at the top counter._value += 1; } function decrement(Counter storage counter) internal { counter._value = counter._value.sub(1); } } // File: @openzeppelin/contracts/drafts/EIP712.sol pragma solidity >=0.6.0 <0.8.0; /** * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data. * * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible, * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding * they need in their contracts using a combination of `abi.encode` and `keccak256`. * * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA * ({_hashTypedDataV4}). * * The implementation of the domain separator was designed to be as efficient as possible while still properly updating * the chain id to protect against replay attacks on an eventual fork of the chain. * * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask]. * * _Available since v3.4._ */ abstract contract EIP712 { /* solhint-disable var-name-mixedcase */ // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to // invalidate the cached domain separator if the chain id changes. bytes32 private immutable _CACHED_DOMAIN_SEPARATOR; uint256 private immutable _CACHED_CHAIN_ID; bytes32 private immutable _HASHED_NAME; bytes32 private immutable _HASHED_VERSION; bytes32 private immutable _TYPE_HASH; /* solhint-enable var-name-mixedcase */ /** * @dev Initializes the domain separator and parameter caches. * * The meaning of `name` and `version` is specified in * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]: * * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol. * - `version`: the current major version of the signing domain. * * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart * contract upgrade]. */ constructor(string memory name, string memory version) internal { bytes32 hashedName = keccak256(bytes(name)); bytes32 hashedVersion = keccak256(bytes(version)); bytes32 typeHash = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"); _HASHED_NAME = hashedName; _HASHED_VERSION = hashedVersion; _CACHED_CHAIN_ID = _getChainId(); _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion); _TYPE_HASH = typeHash; } /** * @dev Returns the domain separator for the current chain. */ function _domainSeparatorV4() internal view virtual returns (bytes32) { if (_getChainId() == _CACHED_CHAIN_ID) { return _CACHED_DOMAIN_SEPARATOR; } else { return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION); } } function _buildDomainSeparator(bytes32 typeHash, bytes32 name, bytes32 version) private view returns (bytes32) { return keccak256( abi.encode( typeHash, name, version, _getChainId(), address(this) ) ); } /** * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this * function returns the hash of the fully encoded EIP712 message for this domain. * * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example: * * ```solidity * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode( * keccak256("Mail(address to,string contents)"), * mailTo, * keccak256(bytes(mailContents)) * ))); * address signer = ECDSA.recover(digest, signature); * ``` */ function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", _domainSeparatorV4(), structHash)); } function _getChainId() private view returns (uint256 chainId) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 // solhint-disable-next-line no-inline-assembly assembly { chainId := chainid() } } } // File: @openzeppelin/contracts/drafts/ERC20Permit.sol pragma solidity >=0.6.5 <0.8.0; /** * @dev Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. * * _Available since v3.4._ */ abstract contract ERC20Permit is ERC20, IERC20Permit, EIP712 { using Counters for Counters.Counter; mapping (address => Counters.Counter) private _nonces; // solhint-disable-next-line var-name-mixedcase bytes32 private immutable _PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"); /** * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`. * * It's a good idea to use the same `name` that is defined as the ERC20 token name. */ constructor(string memory name) internal EIP712(name, "1") { } /** * @dev See {IERC20Permit-permit}. */ function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public virtual override { // solhint-disable-next-line not-rely-on-time require(block.timestamp <= deadline, "ERC20Permit: expired deadline"); bytes32 structHash = keccak256( abi.encode( _PERMIT_TYPEHASH, owner, spender, value, _nonces[owner].current(), deadline ) ); bytes32 hash = _hashTypedDataV4(structHash); address signer = ECDSA.recover(hash, v, r, s); require(signer == owner, "ERC20Permit: invalid signature"); _nonces[owner].increment(); _approve(owner, spender, value); } /** * @dev See {IERC20Permit-nonces}. */ function nonces(address owner) public view override returns (uint256) { return _nonces[owner].current(); } /** * @dev See {IERC20Permit-DOMAIN_SEPARATOR}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view override returns (bytes32) { return _domainSeparatorV4(); } } // File: contracts/0.6.12/interfaces/IStETH.sol // SPDX-FileCopyrightText: 2021 Lido <[email protected]> pragma solidity 0.6.12; // latest available for using OZ interface IStETH is IERC20 { function getPooledEthByShares(uint256 _sharesAmount) external view returns (uint256); function getSharesByPooledEth(uint256 _pooledEthAmount) external view returns (uint256); function submit(address _referral) external payable returns (uint256); } // File: contracts/0.6.12/WstETH.sol // SPDX-FileCopyrightText: 2021 Lido <[email protected]> /* See contracts/COMPILERS.md */ pragma solidity 0.6.12; /** * @title StETH token wrapper with static balances. * @dev It's an ERC20 token that represents the account's share of the total * supply of stETH tokens. WstETH token's balance only changes on transfers, * unlike StETH that is also changed when oracles report staking rewards and * penalties. It's a "power user" token for DeFi protocols which don't * support rebasable tokens. * * The contract is also a trustless wrapper that accepts stETH tokens and mints * wstETH in return. Then the user unwraps, the contract burns user's wstETH * and sends user locked stETH in return. * * The contract provides the staking shortcut: user can send ETH with regular * transfer and get wstETH in return. The contract will send ETH to Lido submit * method, staking it and wrapping the received stETH. * */ contract WstETH is ERC20Permit { IStETH public stETH; /** * @param _stETH address of the StETH token to wrap */ constructor(IStETH _stETH) public ERC20Permit("Wrapped liquid staked Ether 2.0") ERC20("Wrapped liquid staked Ether 2.0", "wstETH") { stETH = _stETH; } /** * @notice Exchanges stETH to wstETH * @param _stETHAmount amount of stETH to wrap in exchange for wstETH * @dev Requirements: * - `_stETHAmount` must be non-zero * - msg.sender must approve at least `_stETHAmount` stETH to this * contract. * - msg.sender must have at least `_stETHAmount` of stETH. * User should first approve _stETHAmount to the WstETH contract * @return Amount of wstETH user receives after wrap */ function wrap(uint256 _stETHAmount) external returns (uint256) { require(_stETHAmount > 0, "wstETH: can't wrap zero stETH"); uint256 wstETHAmount = stETH.getSharesByPooledEth(_stETHAmount); _mint(msg.sender, wstETHAmount); stETH.transferFrom(msg.sender, address(this), _stETHAmount); return wstETHAmount; } /** * @notice Exchanges wstETH to stETH * @param _wstETHAmount amount of wstETH to uwrap in exchange for stETH * @dev Requirements: * - `_wstETHAmount` must be non-zero * - msg.sender must have at least `_wstETHAmount` wstETH. * @return Amount of stETH user receives after unwrap */ function unwrap(uint256 _wstETHAmount) external returns (uint256) { require(_wstETHAmount > 0, "wstETH: zero amount unwrap not allowed"); uint256 stETHAmount = stETH.getPooledEthByShares(_wstETHAmount); _burn(msg.sender, _wstETHAmount); stETH.transfer(msg.sender, stETHAmount); return stETHAmount; } /** * @notice Shortcut to stake ETH and auto-wrap returned stETH */ receive() external payable { uint256 shares = stETH.submit{value: msg.value}(address(0)); _mint(msg.sender, shares); } /** * @notice Get amount of wstETH for a given amount of stETH * @param _stETHAmount amount of stETH * @return Amount of wstETH for a given stETH amount */ function getWstETHByStETH(uint256 _stETHAmount) external view returns (uint256) { return stETH.getSharesByPooledEth(_stETHAmount); } /** * @notice Get amount of stETH for a given amount of wstETH * @param _wstETHAmount amount of wstETH * @return Amount of stETH for a given wstETH amount */ function getStETHByWstETH(uint256 _wstETHAmount) external view returns (uint256) { return stETH.getPooledEthByShares(_wstETHAmount); } /** * @notice Get amount of stETH for a one wstETH * @return Amount of stETH for 1 wstETH */ function stEthPerToken() external view returns (uint256) { return stETH.getPooledEthByShares(1 ether); } /** * @notice Get amount of wstETH for a one stETH * @return Amount of wstETH for a 1 stETH */ function tokensPerStEth() external view returns (uint256) { return stETH.getSharesByPooledEth(1 ether); } }
Contract Security Audit
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[{"inputs":[{"internalType":"contract IStETH","name":"_stETH","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"DOMAIN_SEPARATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_wstETHAmount","type":"uint256"}],"name":"getStETHByWstETH","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_stETHAmount","type":"uint256"}],"name":"getWstETHByStETH","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"permit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stETH","outputs":[{"internalType":"contract IStETH","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"stEthPerToken","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokensPerStEth","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_wstETHAmount","type":"uint256"}],"name":"unwrap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_stETHAmount","type":"uint256"}],"name":"wrap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]
Contract Creation Code
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Deployed Bytecode
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000ae7ab96520de3a18e5e111b5eaab095312d7fe84
-----Decoded View---------------
Arg [0] : _stETH (address): 0xae7ab96520DE3A18E5e111B5EaAb095312D7fE84
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000ae7ab96520de3a18e5e111b5eaab095312d7fe84
Deployed Bytecode Sourcemap
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Swarm Source
ipfs://186e50b7fede392854c0f7a5c7a0ca06364c7a59f763103f5fdc8e825f75be23
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