ETH Price: $3,589.53 (-5.37%)

Token

Wrapped BTC (WBTC)
 

Overview

Max Total Supply

136,273.62508145 WBTC

Holders

104,414 ( 0.010%)

Market

Price

$94,698.00 @ 26.381706 ETH (-3.26%)

Onchain Market Cap

$12,904,839,747.96

Circulating Supply Market Cap

$12,972,454,679.00

Other Info

Token Contract (WITH 8 Decimals)

Filtered by Token Holder
Premia: Multisig
Balance
2.74553581 WBTC

Value
$259,996.75 ( ~72.4319 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):$1,004,730,248.00
Market Capitalization:$12,972,454,679.00
Circulating Supply:136,274.00 WBTC
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Uniswap V3 (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XDAC17F958D2EE523A2206206994597C13D831EC7$94,992.00
26.4698140 Eth
$215,978,487.00
2,233.000 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0007%
2
Uniswap V3 (Ethereum)
0XCBB7C0000AB88B473B1F5AFD9EF808440EED33BF-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$95,059.00
26.4906200 Eth
$162,236,648.00
1,703.542 0XCBB7C0000AB88B473B1F5AFD9EF808440EED33BF
0.0005%
3
Binance
WBTC-BTC$94,870.00
26.5167590 Eth
$63,216,812.00
666.317 WBTC
0.0002%
4
Binance
WBTC-USDT$95,196.00
26.5316300 Eth
$33,106,138.00
344.496 WBTC
0.0001%
5
Bybit
WBTC-USDT$95,004.00
26.4780940 Eth
$27,435,948.00
283.862 WBTC
0.0001%
6
Dexalot
WBTC-USDC$95,001.00
26.5373800 Eth
$23,892,176.00
247.095 WBTC
0.0001%
7
Tokenize
WBTC-BTC$94,115.00
26.2225310 Eth
$12,780,643.00
135.798 WBTC
0.0000%
8
Bybit
WBTC-BTC$94,951.00
26.4633090 Eth
$11,541,773.00
121.395 WBTC
0.0000%
9
Curve (Ethereum)
0XCBB7C0000AB88B473B1F5AFD9EF808440EED33BF-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$94,593.00
26.3971590 Eth
$7,685,041.00
81.027 0XCBB7C0000AB88B473B1F5AFD9EF808440EED33BF
0.0000%
10
Uniswap V3 (Ethereum)
0X8236A87084F8B84306F72007F36F2618A5634494-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$95,059.00
26.4906200 Eth
$6,605,091.00
69.374 0X8236A87084F8B84306F72007F36F2618A5634494
0.0000%
11
Uniswap V3 (Ethereum)
0XCBB7C0000AB88B473B1F5AFD9EF808440EED33BF-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$95,220.00
26.5332280 Eth
$3,792,631.00
39.767 0XCBB7C0000AB88B473B1F5AFD9EF808440EED33BF
0.0000%
12
Coinbase Exchange
WBTC-BTC$94,880.00
26.5202250 Eth
$3,244,231.00
34.193 WBTC
0.0000%
13
Bitunix
WBTC-USDT$95,282.00
26.5544720 Eth
$3,221,267.00
33.788 WBTC
0.0000%
14
Tokpie
WBTC-USDT$94,501.00
26.3552080 Eth
$2,585,634.00
27.361 WBTC
0.0000%
15
Uniswap V3 (Ethereum)
0X18084FBA666A33D37592FA2633FD49A74DD93A88-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$95,204.00
26.5287880 Eth
$2,252,123.00
23.660 0X18084FBA666A33D37592FA2633FD49A74DD93A88
0.0000%
16
Sushiswap
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$95,071.00
26.4917250 Eth
$1,628,725.00
17.267 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
17
DigiFinex
WBTC-BTC$95,041.00
26.4882650 Eth
$1,261,136.00
13.269 WBTC
0.0000%
18
DeGate
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$95,424.00
26.5925860 Eth
$951,963.00
9.821 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
19
Azbit
WBTC-ETH$94,884.00
26.4702150 Eth
$949,853.00
10.146 WBTC
0.0000%
20
Pionex
WBTC-BTC$94,829.00
26.5058780 Eth
$946,968.00
9.986 WBTC
0.0000%
21
Coinbase Exchange
WBTC-USD$94,937.00
26.5360570 Eth
$904,367.00
9.526 WBTC
0.0000%
22
Uniswap V3 (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$95,011.00
26.4749890 Eth
$884,987.00
9.205 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
23
OKX
WBTC-USDT$94,837.00
26.4256260 Eth
$829,725.00
8.587 WBTC
0.0000%
24
Uniswap V2 (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$94,942.00
26.5324940 Eth
$735,900.00
7.835 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
25
OKX
WBTC-BTC$95,061.00
26.4879660 Eth
$713,965.00
7.511 WBTC
0.0000%
26
MEXC
WBTC-USDT$95,173.00
26.5200240 Eth
$677,612.00
7.120 WBTC
0.0000%
27
Curve (Ethereum)
0XDAC17F958D2EE523A2206206994597C13D831EC7-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$94,654.00
26.3804340 Eth
$597,173.00
611,379.743 0XDAC17F958D2EE523A2206206994597C13D831EC7
0.1945%
28
Uniswap V3 (Ethereum)
0X661C70333AA1850CCDBAE82776BB436A0FCFEEFB-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$95,059.00
26.4906200 Eth
$592,733.00
6.239 0X661C70333AA1850CCDBAE82776BB436A0FCFEEFB
0.0000%
29
Curve (Ethereum)
0X657E8C867D8B37DCC18FA4CAEAD9C45EB088C642-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$94,414.00
26.3809200 Eth
$493,593.00
5.236 0X657E8C867D8B37DCC18FA4CAEAD9C45EB088C642
0.0000%
30
FMFW.io
WBTC-ETH$95,047.00
26.5616500 Eth
$485,754.00
5.111 WBTC
0.0000%
31
Azbit
WBTC-USDT$95,065.00
26.5035180 Eth
$462,902.00
4.786 WBTC
0.0000%
32
Tokpie
ETH-WBTC$95,121.00
26.5666880 Eth
$427,499.00
120.135 ETH
0.0000%
33
Uniswap V3 (Ethereum)
0XC96DE26018A54D51C097160568752C4E3BD6C364-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$95,059.00
26.4906200 Eth
$415,149.00
4.358 0XC96DE26018A54D51C097160568752C4E3BD6C364
0.0000%
34
BingX
WBTC-USDT$95,089.00
26.4958330 Eth
$405,477.00
4.213 WBTC
0.0000%
35
Curve (Ethereum)
0XDAC17F958D2EE523A2206206994597C13D831EC7-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$94,654.00
26.3804340 Eth
$382,280.00
389,713.287 0XDAC17F958D2EE523A2206206994597C13D831EC7
0.1240%
36
Curve (Ethereum)
0X657E8C867D8B37DCC18FA4CAEAD9C45EB088C642-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$94,530.00
26.4036750 Eth
$379,412.00
4.021 0X657E8C867D8B37DCC18FA4CAEAD9C45EB088C642
0.0000%
37
Tokpie
BNB-WBTC$94,833.00
26.5069410 Eth
$364,797.00
552.800 BNB
0.0002%
38
Azbit
WBTC-BTC$95,028.00
26.4845480 Eth
$362,742.00
3.817 WBTC
0.0000%
39
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$95,035.00
26.4817040 Eth
$359,802.00
23,703.395 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0075%
40
Kraken
WBTC-XBT$94,885.00
26.4423420 Eth
$352,773.00
3.718 WBTC
0.0000%
41
Curve (Ethereum)
0X8236A87084F8B84306F72007F36F2618A5634494-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$94,664.00
26.3761620 Eth
$341,446.00
3.601 0X8236A87084F8B84306F72007F36F2618A5634494
0.0000%
42
Osmosis
IBC/D1542AA8762DB13087D8364F3EA6509FD6F009A34F00426AF9E4F9FA85CBBF1F-UOSMO$95,225.00
26.5395230 Eth
$304,505.00
3.198 IBC/D1542AA8762DB13087D8364F3EA6509FD6F009A34F00426AF9E4F9FA85CBBF1F
0.0000%
43
Curve (Ethereum)
0X18084FBA666A33D37592FA2633FD49A74DD93A88-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$94,654.00
26.3804340 Eth
$273,591.00
2.891 0X18084FBA666A33D37592FA2633FD49A74DD93A88
0.0000%
44
Binance
WBTC-ETH$95,247.00
26.5164210 Eth
$251,424.00
2.663 WBTC
0.0000%
45
Curve (Ethereum)
0X8236A87084F8B84306F72007F36F2618A5634494-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$94,570.00
26.3559820 Eth
$222,873.00
2.353 0X8236A87084F8B84306F72007F36F2618A5634494
0.0000%
46
BitMart
WBTC-USDT$95,204.00
26.5337990 Eth
$209,948.00
2.205 WBTC
0.0000%
47
Osmosis
IBC/D1542AA8762DB13087D8364F3EA6509FD6F009A34F00426AF9E4F9FA85CBBF1F-UOSMO$95,172.00
26.5248000 Eth
$191,568.00
2.013 IBC/D1542AA8762DB13087D8364F3EA6509FD6F009A34F00426AF9E4F9FA85CBBF1F
0.0000%
48
Curve (Ethereum)
0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$94,627.00
26.3815300 Eth
$182,896.00
187,332.728 0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48
0.0596%
49
Tokpie
DAF-WBTC$95,121.00
26.5666880 Eth
$161,558.00
115,163,296.860 DAF
36.6323%
50
Bitfinex
WBT-USD$94,529.00
26.3455970 Eth
$152,207.00
1.610 WBT
0.0000%
51
CoinTR
WBTC-USDT$95,197.00
26.5880990 Eth
$150,701.00
1.557 WBTC
0.0000%
52
Tokpie
CAKE-WBTC$95,028.00
26.4837430 Eth
$148,031.00
47,473.584 CAKE
0.0151%
53
Curve (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$94,408.00
26.2888680 Eth
$132,647.00
1.438 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
54
Bitget
WBTC-USDT$95,078.00
26.4985280 Eth
$123,603.00
1.278 WBTC
0.0000%
55
ProBit Global
WBTC-USDT$94,837.00
26.5030220 Eth
$119,646.00
1.262 WBTC
0.0000%
56
PancakeSwap V3 (Ethereum)
0XCBB7C0000AB88B473B1F5AFD9EF808440EED33BF-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$95,738.00
26.7392760 Eth
$109,209.00
1.141 0XCBB7C0000AB88B473B1F5AFD9EF808440EED33BF
0.0000%
57
Gate.io
WBTC-USDT$95,375.00
26.5756300 Eth
$109,178.00
1.125 WBTC
0.0000%
58
Crypto.com Exchange
WBTC-USD$94,701.00
26.3935090 Eth
$93,366.00
0.986 WBTC
0.0000%
59
Uniswap V2 (Ethereum)
0X3472A5A71965499ACD81997A54BBA8D852C6E53D-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$95,042.00
26.5143240 Eth
$76,423.00
20,861.890 0X3472A5A71965499ACD81997A54BBA8D852C6E53D
0.0066%
60
Sushiswap
0X3472A5A71965499ACD81997A54BBA8D852C6E53D-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$95,071.00
26.4917250 Eth
$65,832.00
17,842.584 0X3472A5A71965499ACD81997A54BBA8D852C6E53D
0.0057%
61
DeGate
ETH-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$95,111.00
26.5335400 Eth
$63,727.00
17.573 ETH
0.0000%
62
Osmosis
IBC/498A0751C798A0D9A389AA3691123DADA57DAA4FE165D5C75894505B876BA6E4-IBC/D1542AA8762DB13087D8364F3EA6509FD6F009A34F00426AF9E4F9FA85CBBF1F$95,167.00
26.5233920 Eth
$49,687.00
49,677.164 IBC/498A0751C798A0D9A389AA3691123DADA57DAA4FE165D5C75894505B876BA6E4
0.0158%
63
Uniswap V3 (Ethereum)
0X7A56E1C57C7475CCF742A1832B028F0456652F97-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$94,928.00
26.4824380 Eth
$47,416.00
0.500 0X7A56E1C57C7475CCF742A1832B028F0456652F97
0.0000%
64
Gate.io
WBTC-BTC$94,770.00
26.4128670 Eth
$47,042.00
0.497 WBTC
0.0000%
65
Verse
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$95,610.00
26.6469100 Eth
$41,353.00
0.439 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
66
Kraken
WBTC-EUR$94,246.00
26.2641670 Eth
$38,641.00
0.410 WBTC
0.0000%
67
MEXC
WBTC-USDC$94,788.00
26.4190230 Eth
$34,323.00
0.362 WBTC
0.0000%
68
Uniswap V3 (Ethereum)
0X9BE89D2A4CD102D8FECC6BF9DA793BE995C22541-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$94,977.00
26.4655480 Eth
$33,165.00
0.350 0X9BE89D2A4CD102D8FECC6BF9DA793BE995C22541
0.0000%
69
Solidly V3 (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$95,696.00
26.6657910 Eth
$31,157.00
0.333 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
70
Bitvavo
WBTC-EUR$94,852.00
26.5103710 Eth
$30,929.00
0.326 WBTC
0.0000%
71
Crypto.com Exchange
WBTC-BTC$95,247.00
26.5456090 Eth
$30,784.00
0.323 WBTC
0.0000%
72
ProBit Global
WBTC-BTC$94,843.00
26.5047290 Eth
$28,567.00
0.301 WBTC
0.0000%
73
Kraken
WBTC-USD$94,839.00
26.4295560 Eth
$27,763.00
0.293 WBTC
0.0000%
74
Tokpie
GEM-WBTC$94,875.00
26.5112420 Eth
$25,374.00
4,218,089.660 GEM
1.3417%
75
Phemex
WBTC-USDT$95,230.00
26.5810840 Eth
$22,950.00
0.241 WBTC
0.0000%
76
Stellaswap (V3)
0XE57EBD2D67B462E9926E04A8E33F01CD0D64346D-0XACC15DC74880C9944775448304B263D191C6077F$95,601.00
26.7010030 Eth
$17,205.39
0.190 0XE57EBD2D67B462E9926E04A8E33F01CD0D64346D
0.0000%
77
FMFW.io
WBTC-USDT$95,038.00
26.4873790 Eth
$17,108.88
0.180 WBTC
0.0000%
78
PancakeSwap (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$95,441.00
26.6563750 Eth
$16,250.94
0.173 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
79
Tokenize
WBTC-ETH$94,326.00
26.2852050 Eth
$15,547.11
0.165 WBTC
0.0000%
80
OKX
WBTC-USDC$94,953.00
26.4578890 Eth
$15,242.01
0.157 WBTC
0.0000%
81
Kujira Fin
WBTC-MNTA$94,989.00
26.6074160 Eth
$13,755.26
0.150 WBTC
0.0000%
82
KyberSwap Classic (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XDAC17F958D2EE523A2206206994597C13D831EC7$94,928.00
26.4566780 Eth
$12,160.74
0.126 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
83
CoinEx
WBTC-BTC$94,713.00
26.4660690 Eth
$11,766.49
0.124 WBTC
0.0000%
84
KuCoin
WBTC-USDT$94,727.00
26.3950970 Eth
$11,433.61
0.121 WBTC
0.0000%
85
Uniswap V2 (Ethereum)
0X35A532D376FFD9A705D0BB319532837337A398E7-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$94,942.00
26.5324940 Eth
$7,255.09
18,170.301 0X35A532D376FFD9A705D0BB319532837337A398E7
0.0058%
86
Tokpie
BAMBOO-WBTC$95,121.00
26.5666880 Eth
$5,718.88
11,651,379.614 BAMBOO
3.7062%
87
CEX.IO
WBTC-BTC$94,933.00
26.4571980 Eth
$5,528.83
0.058 WBTC
0.0000%
88
Uniswap V3 (Ethereum)
0X6982508145454CE325DDBE47A25D4EC3D2311933-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$95,013.00
26.4796030 Eth
$4,440.02
181,970,398.160 0X6982508145454CE325DDBE47A25D4EC3D2311933
57.8830%
89
Curve (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0X7F39C581F595B53C5CB19BD0B3F8DA6C935E2CA0$94,664.00
26.3761620 Eth
$3,907.35
0.041 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
90
Uniswap V3 (Ethereum)
0X004E9C3EF86BC1CA1F0BB5C7662861EE93350568-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$94,918.00
26.5329860 Eth
$3,647.30
0.039 0X004E9C3EF86BC1CA1F0BB5C7662861EE93350568
0.0000%
91
Kujira Fin
WBTC-KUJI$95,469.00
26.6334040 Eth
$2,802.60
0.031 WBTC
0.0000%
92
KuCoin
WBTC-BTC$94,356.00
26.2896190 Eth
$2,566.48
0.027 WBTC
0.0000%
93
Stellaswap (V3)
0XE57EBD2D67B462E9926E04A8E33F01CD0D64346D-0XFFFFFFFF5AC1F9A51A93F5C527385EDF7FE98A52$95,257.00
26.6165040 Eth
$2,347.41
0.025 0XE57EBD2D67B462E9926E04A8E33F01CD0D64346D
0.0000%
94
Uniswap V3 (Ethereum)
0XD31A59C85AE9D8EDEFEC411D448F90841571B89C-0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599$95,440.00
26.5968790 Eth
$1,766.68
8.269 0XD31A59C85AE9D8EDEFEC411D448F90841571B89C
0.0000%
95
FMFW.io
WBTC-BTC$95,159.00
26.6451090 Eth
$1,548.23
0.016 WBTC
0.0000%
96
Uniswap V2 (Ethereum)
0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$95,212.00
26.5360820 Eth
$1,478.02
0.015 0X2260FAC5E5542A773AA44FBCFEDF7C193BC2C599
0.0000%
97
CEX.IO
WBTC-EUR$95,338.00
26.5683870 Eth
$50.08
0.001 WBTC
0.0000%
98
CEX.IO
WBTC-USD$95,267.00
26.5502480 Eth
$47.05
0.000 WBTC
0.0000%
99
CEX.IO
WBTC-USDT$95,230.00
26.5668210 Eth
$46.07
0.000 WBTC
0.0000%
100
CEX.IO
WBTC-USDC$95,561.00
26.6589490 Eth
$23.96
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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