ETH Price: $3,931.83 (+5.59%)

Token

Wrapped BTC (WBTC)
 

Overview

Max Total Supply

137,449.75529078 WBTC

Holders

104,352 ( -0.061%)

Market

Price

$102,025.00 @ 25.948490 ETH (+6.31%)

Onchain Market Cap

$14,023,311,283.54

Circulating Supply Market Cap

$14,038,176,262.00

Other Info

Token Contract (WITH 8 Decimals)

Filtered by Token Holder
Premia: Multisig
Balance
2.74553581 WBTC

Value
$280,113.29 ( ~71.2425 Eth) [0.0020%]
0xc22fae86443aeed038a4ed887bba8f5035fd12f0
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OVERVIEW

Wrapped Bitcoin (WBTC) is an ERC20 token backed 1:1 with Bitcoin. Completely transparent. 100% verifiable. Community led.

Market

Volume (24H):$854,033,341.00
Market Capitalization:$14,038,176,262.00
Circulating Supply:137,585.00 WBTC
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Uniswap V3 (Ethereum)
0XCBB7C0000AB88B473B1F5AFD9EF808440EED33BF-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$101,897.00
25.9575500 Eth
$288,209,479.00
2,818.076 0XCBB7C0000AB88B473B1F5AFD9EF808440EED33BF
0.0022%
2
Uniswap V3 (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$102,054.00
26.0058430 Eth
$165,872,468.00
1,627.891 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0013%
3
Binance
WBTC-USDT$102,064.00
25.9858590 Eth
$44,106,154.00
441.406 WBTC
0.0004%
4
Uniswap V3 (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XDAC17F958D2EE523A2206206994597C13D831EC7$101,905.00
25.9711700 Eth
$41,851,624.00
422.463 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0003%
5
Binance
WBTC-BTC$101,976.00
26.0223910 Eth
$39,499,620.00
387.377 WBTC
0.0003%
6
Uniswap V3 (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$102,016.00
25.9993320 Eth
$34,270,562.00
338.369 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0003%
7
Bitrue
WBTC-BTC$101,964.00
26.0197470 Eth
$30,484,072.00
298.970 WBTC
0.0002%
8
Uniswap V3 (Ethereum)
0X18084FBA666A33D37592FA2633FD49A74DD93A88-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$101,873.00
25.9598110 Eth
$26,826,203.00
263.354 0X18084FBA666A33D37592FA2633FD49A74DD93A88
0.0002%
9
Curve (Ethereum)
0X18084FBA666A33D37592FA2633FD49A74DD93A88-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$102,330.00
26.0975810 Eth
$17,724,414.00
173.185 0X18084FBA666A33D37592FA2633FD49A74DD93A88
0.0001%
10
Uniswap V3 (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XDAC17F958D2EE523A2206206994597C13D831EC7$101,873.00
25.9598110 Eth
$12,338,645.00
125.501 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0001%
11
Dexalot
WBTC-USDC$102,288.00
26.0333070 Eth
$6,936,716.00
72.255 WBTC
0.0001%
12
Uniswap V3 (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$101,715.00
25.9226670 Eth
$6,768,304.00
65.203 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0001%
13
Curve (Ethereum)
0XCBB7C0000AB88B473B1F5AFD9EF808440EED33BF-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$103,392.00
26.3240930 Eth
$5,077,616.00
48.915 0XCBB7C0000AB88B473B1F5AFD9EF808440EED33BF
0.0000%
14
Tokpie
WBTC-USDT$102,296.00
26.0586180 Eth
$4,821,055.00
47.129 WBTC
0.0000%
15
Bitunix
WBTC-USDT$101,953.00
25.9857640 Eth
$4,611,380.00
45.230 WBTC
0.0000%
16
Kraken
WBTC-XBT$102,261.00
26.0502730 Eth
$3,154,354.00
30.846 WBTC
0.0000%
17
Bybit
WBTC-BTC$101,984.00
25.9656570 Eth
$3,048,569.00
29.846 WBTC
0.0000%
18
Uniswap V3 (Ethereum)
0XCBB7C0000AB88B473B1F5AFD9EF808440EED33BF-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$101,834.00
25.9414740 Eth
$2,784,431.00
27.243 0XCBB7C0000AB88B473B1F5AFD9EF808440EED33BF
0.0000%
19
Uniswap V3 (Ethereum)
0X8236A87084F8B84306F72007F36F2618A5634494-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$101,897.00
25.9575500 Eth
$2,725,395.00
26.697 0X8236A87084F8B84306F72007F36F2618A5634494
0.0000%
20
OKX
WBTC-BTC$101,877.00
25.9479380 Eth
$1,994,051.00
19.541 WBTC
0.0000%
21
Sushiswap
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$101,801.00
25.9445850 Eth
$1,973,419.00
19.493 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
22
Coinbase Exchange
WBTC-BTC$101,862.00
25.9468030 Eth
$1,731,865.00
17.002 WBTC
0.0000%
23
Tokenize
WBTC-BTC$100,912.00
25.7148210 Eth
$1,723,748.00
17.082 WBTC
0.0000%
24
Coinbase Exchange
WBTC-USD$101,912.00
25.9596650 Eth
$1,591,671.00
15.618 WBTC
0.0000%
25
Uniswap V3 (Ethereum)
0X7A56E1C57C7475CCF742A1832B028F0456652F97-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$101,724.00
25.9273860 Eth
$1,388,585.00
13.653 0X7A56E1C57C7475CCF742A1832B028F0456652F97
0.0000%
26
Kraken
WBTC-USD$102,607.00
26.1384820 Eth
$1,318,026.00
12.845 WBTC
0.0000%
27
Uniswap V3 (Ethereum)
0X3472A5A71965499ACD81997A54BBA8D852C6E53D-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$101,783.00
25.9399780 Eth
$1,302,068.00
278,399.634 0X3472A5A71965499ACD81997A54BBA8D852C6E53D
0.2222%
28
Bybit
WBTC-USDT$102,129.00
26.0024630 Eth
$1,190,795.00
12.079 WBTC
0.0000%
29
OKX
WBTC-USDT$102,144.00
26.0160820 Eth
$1,076,975.00
10.847 WBTC
0.0000%
30
Pionex
WBTC-BTC$102,088.00
26.0360010 Eth
$973,531.00
9.537 WBTC
0.0000%
31
Curve (Ethereum)
0XDAC17F958D2EE523A2206206994597C13D831EC7-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$102,551.00
26.1100740 Eth
$965,373.00
941,548.825 0XDAC17F958D2EE523A2206206994597C13D831EC7
0.7516%
32
DeGate
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$102,737.00
26.1565890 Eth
$898,974.00
9.149 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
33
Uniswap V2 (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$102,565.00
26.1338080 Eth
$892,278.00
8.775 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
34
Curve (Ethereum)
0X8236A87084F8B84306F72007F36F2618A5634494-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$102,600.00
26.1188020 Eth
$783,811.00
7.628 0X8236A87084F8B84306F72007F36F2618A5634494
0.0000%
35
MEXC
WBTC-USDT$102,021.00
25.9750010 Eth
$754,958.00
7.400 WBTC
0.0000%
36
DigiFinex
WBTC-BTC$102,045.00
25.9810420 Eth
$736,354.00
7.216 WBTC
0.0000%
37
Uniswap V3 (Ethereum)
0X661C70333AA1850CCDBAE82776BB436A0FCFEEFB-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$101,897.00
25.9575500 Eth
$686,409.00
6.725 0X661C70333AA1850CCDBAE82776BB436A0FCFEEFB
0.0000%
38
Tokpie
ETH-WBTC$102,045.00
25.9947120 Eth
$546,766.00
140.301 ETH
0.0001%
39
BingX
WBTC-USDT$101,972.00
25.9766900 Eth
$527,485.00
5.284 WBTC
0.0000%
40
Curve (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$102,551.00
26.1100740 Eth
$526,111.00
5.151 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
41
Uniswap V3 (Ethereum)
0X18084FBA666A33D37592FA2633FD49A74DD93A88-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$101,873.00
25.9598110 Eth
$515,882.00
5.064 0X18084FBA666A33D37592FA2633FD49A74DD93A88
0.0000%
42
Azbit
WBTC-ETH$102,082.00
26.0021980 Eth
$491,640.00
4.860 WBTC
0.0000%
43
Uniswap V3 (Ethereum)
0XC96DE26018A54D51C097160568752C4E3BD6C364-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$101,897.00
25.9575500 Eth
$471,027.00
4.613 0XC96DE26018A54D51C097160568752C4E3BD6C364
0.0000%
44
Curve (Ethereum)
0X657E8C867D8B37DCC18FA4CAEAD9C45EB088C642-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$102,318.00
26.0764230 Eth
$410,783.00
4.019 0X657E8C867D8B37DCC18FA4CAEAD9C45EB088C642
0.0000%
45
Tokpie
BNB-WBTC$102,005.00
25.9708720 Eth
$394,834.00
540.959 BNB
0.0004%
46
KuCoin
WBTC-USDT$102,101.00
26.0095110 Eth
$387,106.00
3.791 WBTC
0.0000%
47
Curve (Ethereum)
0X8236A87084F8B84306F72007F36F2618A5634494-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$102,364.00
26.1201490 Eth
$380,671.00
3.713 0X8236A87084F8B84306F72007F36F2618A5634494
0.0000%
48
Binance
WBTC-ETH$101,444.00
25.8834060 Eth
$367,900.00
3.655 WBTC
0.0000%
49
DeGate
ETH-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$102,580.00
26.1808400 Eth
$322,313.00
80.022 ETH
0.0001%
50
Uniswap V3 (Ethereum)
0X9BE89D2A4CD102D8FECC6BF9DA793BE995C22541-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$103,360.00
26.3386160 Eth
$317,723.00
3.071 0X9BE89D2A4CD102D8FECC6BF9DA793BE995C22541
0.0000%
51
Curve (Ethereum)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$102,478.00
26.1137880 Eth
$311,752.00
301,430.967 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.2406%
52
Curve (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$102,117.00
26.0030210 Eth
$307,477.00
3.041 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
53
Kanga
WBTC-BTC$102,368.00
26.0749650 Eth
$291,474.00
0.000 WBTC
0.0000%
54
Curve (Ethereum)
0XDAC17F958D2EE523A2206206994597C13D831EC7-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$102,356.00
26.1046500 Eth
$287,273.00
277,851.927 0XDAC17F958D2EE523A2206206994597C13D831EC7
0.2218%
55
Kraken
WBTC-EUR$102,023.00
25.9895950 Eth
$263,687.00
2.585 WBTC
0.0000%
56
Curve (Ethereum)
0X657E8C867D8B37DCC18FA4CAEAD9C45EB088C642-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$102,364.00
26.1201490 Eth
$262,247.00
2.565 0X657E8C867D8B37DCC18FA4CAEAD9C45EB088C642
0.0000%
57
Osmosis
IBC/D1542AA8762DB13087D8364F3EA6509FD6F009A34F00426AF9E4F9FA85CBBF1F-UOSMO$102,009.00
25.9720400 Eth
$246,812.00
2.420 IBC/D1542AA8762DB13087D8364F3EA6509FD6F009A34F00426AF9E4F9FA85CBBF1F
0.0000%
58
BitMart
WBTC-USDT$101,993.00
25.9679230 Eth
$243,555.00
2.388 WBTC
0.0000%
59
Azbit
WBTC-USDT$101,981.00
25.9903830 Eth
$234,438.00
2.373 WBTC
0.0000%
60
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$101,715.00
25.9226670 Eth
$215,024.00
13,350.326 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0107%
61
Crypto.com Exchange
WBTC-USD$101,970.00
25.9760200 Eth
$206,121.00
2.021 WBTC
0.0000%
62
Balancer V2
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$102,473.00
26.0900960 Eth
$190,639.00
1.881 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
63
Bancor (V2)
WBTC-BNT$102,673.00
26.1409900 Eth
$189,175.00
1.843 WBTC
0.0000%
64
Curve (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$102,229.00
26.0743130 Eth
$188,408.00
1.849 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
65
Azbit
WBTC-BTC$102,055.00
25.9973210 Eth
$185,714.00
1.819 WBTC
0.0000%
66
Tokpie
DAF-WBTC$102,023.00
25.9806630 Eth
$179,167.00
119,075,570.860 DAF
95.0514%
67
CoinTR
WBTC-USDT$101,965.00
25.9705410 Eth
$176,073.00
1.780 WBTC
0.0000%
68
Bitget
WBTC-USDT$101,938.00
25.9540020 Eth
$160,595.00
1.627 WBTC
0.0000%
69
Tokpie
CAKE-WBTC$102,048.00
26.0401030 Eth
$141,478.00
35,570.923 CAKE
0.0284%
70
Osmosis
IBC/D1542AA8762DB13087D8364F3EA6509FD6F009A34F00426AF9E4F9FA85CBBF1F-UOSMO$102,174.00
26.0140430 Eth
$119,682.00
1.171 IBC/D1542AA8762DB13087D8364F3EA6509FD6F009A34F00426AF9E4F9FA85CBBF1F
0.0000%
71
ProBit Global
WBTC-USDT$102,023.00
25.9774680 Eth
$115,888.00
1.136 WBTC
0.0000%
72
Gate.io
WBTC-BTC$101,996.00
25.9827350 Eth
$114,184.00
1.117 WBTC
0.0000%
73
Gate.io
WBTC-USDT$102,935.00
26.2218140 Eth
$77,851.00
0.793 WBTC
0.0000%
74
Bitvavo
WBTC-EUR$101,876.00
25.9506040 Eth
$72,129.00
0.708 WBTC
0.0000%
75
FMFW.io
WBTC-ETH$102,378.00
26.0883530 Eth
$58,756.00
0.574 WBTC
0.0000%
76
HitBTC
WBTC-ETH$102,402.00
26.0860810 Eth
$57,497.00
0.574 WBTC
0.0000%
77
KuCoin
WBTC-BTC$101,609.00
25.8702220 Eth
$42,209.00
0.415 WBTC
0.0000%
78
MEXC
WBTC-USDC$102,526.00
26.1318980 Eth
$39,155.00
0.382 WBTC
0.0000%
79
ProBit Global
WBTC-BTC$101,931.00
25.9745660 Eth
$35,166.00
0.345 WBTC
0.0000%
80
Bitfinex
WBT-BTC$102,217.00
26.0248480 Eth
$32,616.00
0.319 WBT
0.0000%
81
Osmosis
IBC/498A0751C798A0D9A389AA3691123DADA57DAA4FE165D5C75894505B876BA6E4-IBC/D1542AA8762DB13087D8364F3EA6509FD6F009A34F00426AF9E4F9FA85CBBF1F$102,103.00
25.9960090 Eth
$29,982.00
29,989.615 IBC/498A0751C798A0D9A389AA3691123DADA57DAA4FE165D5C75894505B876BA6E4
0.0239%
82
Tokpie
GEM-WBTC$102,023.00
25.9806630 Eth
$27,899.00
4,312,871.740 GEM
3.4427%
83
Solidly V3 (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$102,509.00
26.1134560 Eth
$27,709.00
0.272 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
84
Phemex
WBTC-USDT$101,893.00
25.9641010 Eth
$23,871.00
0.234 WBTC
0.0000%
85
FMFW.io
WBTC-USDT$102,354.00
26.0984270 Eth
$22,374.00
0.219 WBTC
0.0000%
86
HitBTC
WBTC-USDT$101,916.00
25.9622670 Eth
$21,970.00
0.221 WBTC
0.0000%
87
Kujira Fin
WBTC-MNTA$101,073.00
25.7920150 Eth
$21,646.00
0.219 WBTC
0.0000%
88
Stellaswap (V3)
0XE57EBD2D67B462E9926E04A8E33F01CD0D64346D-0XACC15DC74880C9944775448304B263D191C6077F$103,128.00
26.2711740 Eth
$17,990.55
0.179 0XE57EBD2D67B462E9926E04A8E33F01CD0D64346D
0.0000%
89
OKX
WBTC-USDC$101,848.00
25.9406260 Eth
$12,108.08
0.122 WBTC
0.0000%
90
CoinEx
WBTC-BTC$102,122.00
26.0501050 Eth
$10,273.94
0.101 WBTC
0.0000%
91
Kujira Fin
WBTC-KUJI$102,705.00
26.2355650 Eth
$4,312.20
0.044 WBTC
0.0000%
92
Uniswap V3 (Ethereum)
0X004E9C3EF86BC1CA1F0BB5C7662861EE93350568-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$101,897.00
25.9575500 Eth
$3,584.45
0.037 0X004E9C3EF86BC1CA1F0BB5C7662861EE93350568
0.0000%
93
FMFW.io
WBTC-BTC$102,079.00
26.0014340 Eth
$2,892.52
0.028 WBTC
0.0000%
94
HitBTC
WBTC-BTC$102,073.00
26.0085510 Eth
$2,892.50
0.028 WBTC
0.0000%
95
Coinlist
WBTC-BTC$102,341.00
26.0788820 Eth
$1,095.04
0.011 WBTC
0.0000%
96
Uniswap V2 (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XDAC17F958D2EE523A2206206994597C13D831EC7$102,394.00
26.0717800 Eth
$196.39
0.002 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
97
CEX.IO
WBTC-BTC$102,095.00
25.9989220 Eth
$157.97
0.002 WBTC
0.0000%
98
CEX.IO
WBTC-EUR$102,183.00
26.0303760 Eth
$31.06
0.000 WBTC
0.0000%
99
CEX.IO
WBTC-USDT$102,026.00
25.9903100 Eth
$23.27
0.000 WBTC
0.0000%
100
TokoCrypto
WBTC-BTC$101,970.00
26.0058770 Eth
$16.31
0.000 WBTC
0.0000%

Contract Source Code Verified (Exact Match)

Contract Name:
WBTC

Compiler Version
v0.4.24+commit.e67f0147

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2018-11-24
*/

pragma solidity 0.4.24;

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20Basic.sol

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * See https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  function totalSupply() public view returns (uint256);
  function balanceOf(address _who) public view returns (uint256);
  function transfer(address _to, uint256 _value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}

// File: openzeppelin-solidity/contracts/math/SafeMath.sol

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
    // Gas optimization: this is cheaper than asserting 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    if (_a == 0) {
      return 0;
    }

    c = _a * _b;
    assert(c / _a == _b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 _a, uint256 _b) internal pure returns (uint256) {
    // assert(_b > 0); // Solidity automatically throws when dividing by 0
    // uint256 c = _a / _b;
    // assert(_a == _b * c + _a % _b); // There is no case in which this doesn't hold
    return _a / _b;
  }

  /**
  * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {
    assert(_b <= _a);
    return _a - _b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
    c = _a + _b;
    assert(c >= _a);
    return c;
  }
}

// File: openzeppelin-solidity/contracts/token/ERC20/BasicToken.sol

/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) internal balances;

  uint256 internal totalSupply_;

  /**
  * @dev Total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

  /**
  * @dev Transfer token for a specified address
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_value <= balances[msg.sender]);
    require(_to != address(0));

    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    emit Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) public view returns (uint256) {
    return balances[_owner];
  }

}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20.sol

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
  function allowance(address _owner, address _spender)
    public view returns (uint256);

  function transferFrom(address _from, address _to, uint256 _value)
    public returns (bool);

  function approve(address _spender, uint256 _value) public returns (bool);
  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}

// File: openzeppelin-solidity/contracts/token/ERC20/StandardToken.sol

/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://github.com/ethereum/EIPs/issues/20
 * Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) internal allowed;


  /**
   * @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
   */
  function transferFrom(
    address _from,
    address _to,
    uint256 _value
  )
    public
    returns (bool)
  {
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);
    require(_to != address(0));

    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    emit Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   * 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
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    emit Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param _owner address The address which owns the funds.
   * @param _spender address The address which will spend the funds.
   * @return A uint256 specifying the amount of tokens still available for the spender.
   */
  function allowance(
    address _owner,
    address _spender
   )
    public
    view
    returns (uint256)
  {
    return allowed[_owner][_spender];
  }

  /**
   * @dev Increase the amount of tokens that an owner allowed to a spender.
   * approve should be called when allowed[_spender] == 0. To increment
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _addedValue The amount of tokens to increase the allowance by.
   */
  function increaseApproval(
    address _spender,
    uint256 _addedValue
  )
    public
    returns (bool)
  {
    allowed[msg.sender][_spender] = (
      allowed[msg.sender][_spender].add(_addedValue));
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  /**
   * @dev Decrease the amount of tokens that an owner allowed to a spender.
   * approve should be called when allowed[_spender] == 0. To decrement
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _subtractedValue The amount of tokens to decrease the allowance by.
   */
  function decreaseApproval(
    address _spender,
    uint256 _subtractedValue
  )
    public
    returns (bool)
  {
    uint256 oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue >= oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

// File: openzeppelin-solidity/contracts/token/ERC20/DetailedERC20.sol

/**
 * @title DetailedERC20 token
 * @dev The decimals are only for visualization purposes.
 * All the operations are done using the smallest and indivisible token unit,
 * just as on Ethereum all the operations are done in wei.
 */
contract DetailedERC20 is ERC20 {
  string public name;
  string public symbol;
  uint8 public decimals;

  constructor(string _name, string _symbol, uint8 _decimals) public {
    name = _name;
    symbol = _symbol;
    decimals = _decimals;
  }
}

// File: openzeppelin-solidity/contracts/ownership/Ownable.sol

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;


  event OwnershipRenounced(address indexed previousOwner);
  event OwnershipTransferred(
    address indexed previousOwner,
    address indexed newOwner
  );


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  constructor() public {
    owner = msg.sender;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  /**
   * @dev Allows the current owner to relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
  }

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function transferOwnership(address _newOwner) public onlyOwner {
    _transferOwnership(_newOwner);
  }

  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address _newOwner) internal {
    require(_newOwner != address(0));
    emit OwnershipTransferred(owner, _newOwner);
    owner = _newOwner;
  }
}

// File: openzeppelin-solidity/contracts/token/ERC20/MintableToken.sol

/**
 * @title Mintable token
 * @dev Simple ERC20 Token example, with mintable token creation
 * Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol
 */
contract MintableToken is StandardToken, Ownable {
  event Mint(address indexed to, uint256 amount);
  event MintFinished();

  bool public mintingFinished = false;


  modifier canMint() {
    require(!mintingFinished);
    _;
  }

  modifier hasMintPermission() {
    require(msg.sender == owner);
    _;
  }

  /**
   * @dev Function to mint tokens
   * @param _to The address that will receive the minted tokens.
   * @param _amount The amount of tokens to mint.
   * @return A boolean that indicates if the operation was successful.
   */
  function mint(
    address _to,
    uint256 _amount
  )
    public
    hasMintPermission
    canMint
    returns (bool)
  {
    totalSupply_ = totalSupply_.add(_amount);
    balances[_to] = balances[_to].add(_amount);
    emit Mint(_to, _amount);
    emit Transfer(address(0), _to, _amount);
    return true;
  }

  /**
   * @dev Function to stop minting new tokens.
   * @return True if the operation was successful.
   */
  function finishMinting() public onlyOwner canMint returns (bool) {
    mintingFinished = true;
    emit MintFinished();
    return true;
  }
}

// File: openzeppelin-solidity/contracts/token/ERC20/BurnableToken.sol

/**
 * @title Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
contract BurnableToken is BasicToken {

  event Burn(address indexed burner, uint256 value);

  /**
   * @dev Burns a specific amount of tokens.
   * @param _value The amount of token to be burned.
   */
  function burn(uint256 _value) public {
    _burn(msg.sender, _value);
  }

  function _burn(address _who, uint256 _value) internal {
    require(_value <= balances[_who]);
    // no need to require value <= totalSupply, since that would imply the
    // sender's balance is greater than the totalSupply, which *should* be an assertion failure

    balances[_who] = balances[_who].sub(_value);
    totalSupply_ = totalSupply_.sub(_value);
    emit Burn(_who, _value);
    emit Transfer(_who, address(0), _value);
  }
}

// File: openzeppelin-solidity/contracts/lifecycle/Pausable.sol

/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
  event Pause();
  event Unpause();

  bool public paused = false;


  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   */
  modifier whenNotPaused() {
    require(!paused);
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(paused);
    _;
  }

  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() public onlyOwner whenNotPaused {
    paused = true;
    emit Pause();
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() public onlyOwner whenPaused {
    paused = false;
    emit Unpause();
  }
}

// File: openzeppelin-solidity/contracts/token/ERC20/PausableToken.sol

/**
 * @title Pausable token
 * @dev StandardToken modified with pausable transfers.
 **/
contract PausableToken is StandardToken, Pausable {

  function transfer(
    address _to,
    uint256 _value
  )
    public
    whenNotPaused
    returns (bool)
  {
    return super.transfer(_to, _value);
  }

  function transferFrom(
    address _from,
    address _to,
    uint256 _value
  )
    public
    whenNotPaused
    returns (bool)
  {
    return super.transferFrom(_from, _to, _value);
  }

  function approve(
    address _spender,
    uint256 _value
  )
    public
    whenNotPaused
    returns (bool)
  {
    return super.approve(_spender, _value);
  }

  function increaseApproval(
    address _spender,
    uint _addedValue
  )
    public
    whenNotPaused
    returns (bool success)
  {
    return super.increaseApproval(_spender, _addedValue);
  }

  function decreaseApproval(
    address _spender,
    uint _subtractedValue
  )
    public
    whenNotPaused
    returns (bool success)
  {
    return super.decreaseApproval(_spender, _subtractedValue);
  }
}

// File: openzeppelin-solidity/contracts/ownership/Claimable.sol

/**
 * @title Claimable
 * @dev Extension for the Ownable contract, where the ownership needs to be claimed.
 * This allows the new owner to accept the transfer.
 */
contract Claimable is Ownable {
  address public pendingOwner;

  /**
   * @dev Modifier throws if called by any account other than the pendingOwner.
   */
  modifier onlyPendingOwner() {
    require(msg.sender == pendingOwner);
    _;
  }

  /**
   * @dev Allows the current owner to set the pendingOwner address.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    pendingOwner = newOwner;
  }

  /**
   * @dev Allows the pendingOwner address to finalize the transfer.
   */
  function claimOwnership() public onlyPendingOwner {
    emit OwnershipTransferred(owner, pendingOwner);
    owner = pendingOwner;
    pendingOwner = address(0);
  }
}

// File: openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure.
 * To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
  function safeTransfer(
    ERC20Basic _token,
    address _to,
    uint256 _value
  )
    internal
  {
    require(_token.transfer(_to, _value));
  }

  function safeTransferFrom(
    ERC20 _token,
    address _from,
    address _to,
    uint256 _value
  )
    internal
  {
    require(_token.transferFrom(_from, _to, _value));
  }

  function safeApprove(
    ERC20 _token,
    address _spender,
    uint256 _value
  )
    internal
  {
    require(_token.approve(_spender, _value));
  }
}

// File: openzeppelin-solidity/contracts/ownership/CanReclaimToken.sol

/**
 * @title Contracts that should be able to recover tokens
 * @author SylTi
 * @dev This allow a contract to recover any ERC20 token received in a contract by transferring the balance to the contract owner.
 * This will prevent any accidental loss of tokens.
 */
contract CanReclaimToken is Ownable {
  using SafeERC20 for ERC20Basic;

  /**
   * @dev Reclaim all ERC20Basic compatible tokens
   * @param _token ERC20Basic The address of the token contract
   */
  function reclaimToken(ERC20Basic _token) external onlyOwner {
    uint256 balance = _token.balanceOf(this);
    _token.safeTransfer(owner, balance);
  }

}

// File: contracts/utils/OwnableContract.sol

// empty block is used as this contract just inherits others.
contract OwnableContract is CanReclaimToken, Claimable { } /* solhint-disable-line no-empty-blocks */

// File: contracts/token/WBTC.sol

contract WBTC is StandardToken, DetailedERC20("Wrapped BTC", "WBTC", 8),
    MintableToken, BurnableToken, PausableToken, OwnableContract {

    function burn(uint value) public onlyOwner {
        super.burn(value);
    }

    function finishMinting() public onlyOwner returns (bool) {
        return false;
    }

    function renounceOwnership() public onlyOwner {
        revert("renouncing ownership is blocked");
    }
}

Contract Security Audit

Contract ABI

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Swarm Source

bzzr://a1e0f5cdc96081f44eea73f352e7ef8fbfbacd306ec0f0b7275c9752d31fbe32
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