ETH Price: $2,500.27 (-0.53%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

722,349 ( -0.003%)

Market

Price

$11.18 @ 0.004472 ETH (-1.15%)

Onchain Market Cap

$11,180,000,000.00

Circulating Supply Market Cap

$7,010,624,194.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 LINK

Value
$0.00
0x1bc071743a2473884d58c6ef28777867ce53c3d0
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OVERVIEW

A blockchain-based middleware, acting as a bridge between cryptocurrency smart contracts, data feeds, APIs and traditional bank account payments.

Profitability / Loss

Since Initial Offer Price
:$0.11 10063.64% |ETH 0.0003846 1062.77%

Market

Volume (24H):$411,979,136.00
Market Capitalization:$7,010,624,194.00
Circulating Supply:626,849,971.00 LINK
Market Data Source: Coinmarketcap

ICO Information

ICO Start Date : Sep 19, 2017   
Total Cap : $32,000,000
ICO Price  : $0.11 | 0.0003846 ETH
Country : USA

# Exchange Pair Price  24H Volume % Volume
1
WhiteBIT
LINK-USDT$11.17
0.0044663 Eth
$33,669,658.00
3,014,161.890 LINK
16.7048%
2
Binance
LINK-USDT$11.19
0.0044758 Eth
$31,766,278.00
2,794,176.490 LINK
15.4856%
3
HTX
LINK-USDT$11.17
0.0044642 Eth
$12,617,055.00
1,113,326.982 LINK
6.1702%
4
Coinbase Exchange
LINK-USD$11.17
0.0044667 Eth
$11,274,006.00
1,009,130.520 LINK
5.5927%
5
Bitget
LINK-USDT$11.19
0.0044735 Eth
$10,075,590.00
888,796.043 LINK
4.9258%
6
Bybit
LINK-USDT$11.20
0.0044757 Eth
$9,948,843.00
877,133.024 LINK
4.8611%
7
BTSE
LINK-USDT$11.17
0.0044659 Eth
$7,336,734.00
656,957.402 LINK
3.6409%
8
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$11.15
0.0044572 Eth
$7,329,078.00
650,839.304 0X514910771AF9CA656AF840DFF83E8264ECF986CA
3.6070%
9
Gate.io
LINK-USDT$11.20
0.0044756 Eth
$7,032,285.00
617,698.340 LINK
3.4233%
10
OKX
LINK-USDT$11.20
0.0044752 Eth
$6,304,239.00
554,491.152 LINK
3.0730%
11
P2B
LINK-USDT$11.17
0.0044644 Eth
$5,631,715.00
504,269.290 LINK
2.7947%
12
Slex
LINK-USDT$11.17
0.0044679 Eth
$5,476,414.00
483,027.490 LINK
2.6770%
13
DigiFinex
LINK-USDT$11.19
0.0044739 Eth
$4,240,942.00
379,027.820 LINK
2.1006%
14
Biconomy.com
LINK-USDT$11.19
0.0044738 Eth
$3,890,648.00
343,088.200 LINK
1.9014%
15
Azbit
LINK-USDT$11.18
0.0044714 Eth
$3,734,915.00
329,761.770 LINK
1.8276%
16
XT.COM
LINK-USDT$11.19
0.0044812 Eth
$3,165,031.00
278,367.820 LINK
1.5427%
17
Bitunix
LINK-USDT$11.20
0.0044772 Eth
$3,108,530.00
277,666.950 LINK
1.5389%
18
CoinW
LINK-USDT$11.18
0.0044685 Eth
$2,744,180.00
245,539.170 LINK
1.3608%
19
Hotcoin
LINK-USDT$11.16
0.0044611 Eth
$2,715,216.00
243,368.840 LINK
1.3488%
20
Coinstore
LINK-USDT$11.18
0.0044709 Eth
$2,087,122.00
183,713.080 LINK
1.0182%
21
ProBit Global
LINK-USDT$11.16
0.0044638 Eth
$1,971,301.00
176,564.611 LINK
0.9785%
22
HashKey Global
LINK-USDT$11.17
0.0044760 Eth
$1,912,666.00
168,841.827 LINK
0.9357%
23
LBank
LINK-USDT$11.19
0.0044753 Eth
$1,817,358.00
162,338.480 LINK
0.8997%
24
AscendEX (BitMax)
LINK-USDT$11.15
0.0044571 Eth
$1,696,016.00
152,116.000 LINK
0.8430%
25
Trubit
LINK-USDT$11.20
0.0044782 Eth
$1,602,257.00
140,659.010 LINK
0.7795%
26
KuCoin
LINK-USDT$11.16
0.0044630 Eth
$1,600,020.00
143,311.764 LINK
0.7942%
27
BYDFi
LINK-USDT$11.18
0.0044705 Eth
$1,499,449.00
134,176.760 LINK
0.7436%
28
WhiteBIT
LINK-BTC$11.18
0.0044704 Eth
$1,205,816.00
107,852.100 LINK
0.5977%
29
Dex-Trade
LINK-USDT$11.18
0.0044825 Eth
$1,040,613.00
93,036.790 LINK
0.5156%
30
Azbit
LINK-ETH$11.19
0.0044762 Eth
$718,586.00
63,825.792 LINK
0.3537%
31
Bitvavo
LINK-EUR$11.24
0.0044959 Eth
$694,385.00
61,783.478 LINK
0.3424%
32
EXMO
LINK-USDT$11.17
0.0044663 Eth
$621,577.00
55,642.239 LINK
0.3084%
33
LATOKEN
LINK-USDT$11.17
0.0044671 Eth
$599,824.00
53,676.384 LINK
0.2975%
34
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.18
0.0044680 Eth
$535,745.00
47,485.822 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.2632%
35
PointPay
LINK-USDT$11.17
0.0044646 Eth
$526,408.00
46,276.884 LINK
0.2565%
36
BigONE
LINK-USDT$11.18
0.0044738 Eth
$524,598.00
46,925.890 LINK
0.2601%
37
CoinEx
LINK-USDT$11.19
0.0044720 Eth
$520,595.00
45,829.289 LINK
0.2540%
38
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.17
0.0044671 Eth
$510,276.00
45,231.735 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2507%
39
Bybit
LINK-USDC$11.20
0.0044765 Eth
$481,936.00
42,438.585 LINK
0.2352%
40
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.18
0.0044687 Eth
$415,087.00
36,878.336 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.2044%
41
Coinbase Exchange
LINK-USDT$11.17
0.0044650 Eth
$414,948.00
37,161.269 LINK
0.2060%
42
tanX
LINK-USDC$11.17
0.0044738 Eth
$397,711.00
35,049.100 LINK
0.1942%
43
WhiteBIT
LINK-EUR$11.20
0.0044783 Eth
$388,810.00
34,712.180 LINK
0.1924%
44
LATOKEN
LINK-BTC$11.17
0.0044645 Eth
$340,205.00
30,467.632 LINK
0.1689%
45
Phemex
LINK-USDT$11.18
0.0044705 Eth
$314,751.00
28,161.820 LINK
0.1561%
46
WhiteBIT
LINK-TRY$11.24
0.0044928 Eth
$304,465.00
27,096.710 LINK
0.1502%
47
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.25
0.0044960 Eth
$276,941.00
24,520.561 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1359%
48
ProBit Global
LINK-BTC$11.17
0.0044646 Eth
$274,218.00
24,556.831 LINK
0.1361%
49
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.19
0.0044732 Eth
$214,418.00
18,964.458 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1051%
50
Gemini
LINK-USD$11.19
0.0044736 Eth
$210,708.00
18,828.310 LINK
0.1043%
51
BitMart
LINK-BTC$11.17
0.0044662 Eth
$195,811.00
17,526.580 LINK
0.0971%
52
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$11.18
0.0044701 Eth
$180,496.00
15,855.722 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0879%
53
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$11.23
0.0044872 Eth
$172,487.00
15,195.583 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0842%
54
OKX
LINK-USDC$11.17
0.0044664 Eth
$166,214.00
14,589.989 LINK
0.0809%
55
Coinbase Exchange
LINK-GBP$11.19
0.0044762 Eth
$165,614.00
14,793.820 LINK
0.0820%
56
BitDelta
LINK-USDT$11.18
0.0044686 Eth
$154,866.00
13,659.000 LINK
0.0757%
57
Coinbase Exchange
LINK-EUR$11.23
0.0044897 Eth
$153,729.00
13,690.100 LINK
0.0759%
58
BYDFi
LINK-USDC$11.17
0.0044682 Eth
$151,172.00
13,528.710 LINK
0.0750%
59
Bitbank
LINK-JPY$11.22
0.0044870 Eth
$137,430.00
12,246.782 LINK
0.0679%
60
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.17
0.0044658 Eth
$133,453.00
136,034.771 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.7539%
61
Binance
LINK-TRY$11.26
0.0045054 Eth
$104,958.00
9,149.920 LINK
0.0507%
62
Slex
LINK-BTC$11.18
0.0044729 Eth
$100,600.00
8,903.800 LINK
0.0493%
63
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.17
0.0044672 Eth
$82,572.00
83,846.921 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4647%
64
PointPay
LINK-BTC$11.17
0.0044644 Eth
$66,381.00
5,870.771 LINK
0.0325%
65
Bitkub
LINK-THB$11.22
0.0044834 Eth
$63,171.00
5,632.482 LINK
0.0312%
66
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$11.17
0.0044651 Eth
$62,802.00
5,534.846 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0307%
67
Slex
LINK-ETH$11.18
0.0044686 Eth
$53,461.00
4,740.960 LINK
0.0263%
68
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.17
0.0044669 Eth
$50,057.00
4,398.077 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0244%
69
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$11.16
0.0044619 Eth
$48,156.00
4,291.130 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0238%
70
Bitso
LINK-USD$11.19
0.0044751 Eth
$44,576.00
3,982.899 LINK
0.0221%
71
Binance US
LINK-USDT$11.16
0.0044630 Eth
$40,303.00
3,609.852 LINK
0.0200%
72
Coinbase Exchange
LINK-BTC$11.22
0.0044862 Eth
$37,770.00
3,366.340 LINK
0.0187%
73
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$11.19
0.0044720 Eth
$37,609.00
3,304.056 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0183%
74
KuCoin
LINK-USDC$11.19
0.0044729 Eth
$36,857.00
3,293.944 LINK
0.0183%
75
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$11.18
0.0044680 Eth
$33,964.00
34,595.910 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1917%
76
Bybit
LINK-EUR$11.27
0.0045059 Eth
$30,074.00
2,564.590 LINK
0.0142%
77
Coinbase Exchange
LINK-ETH$11.21
0.0044833 Eth
$28,756.00
2,564.660 LINK
0.0142%
78
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$11.19
0.0044719 Eth
$22,924.00
2,030.344 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0113%
79
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$11.23
0.0044903 Eth
$17,347.30
1,535.391 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0085%
80
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.17
0.0044651 Eth
$15,330.42
15,547.935 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0862%
81
PancakeSwap V3 (BSC)
0X0E09FABB73BD3ADE0A17ECC321FD13A19E81CE82-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$11.22
0.0044858 Eth
$15,101.16
8,792.666 0X0E09FABB73BD3ADE0A17ECC321FD13A19E81CE82
0.0487%
82
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$11.17
0.0044649 Eth
$13,796.57
1,228.387 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0068%
83
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$11.19
0.0044718 Eth
$12,134.47
1,076.629 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0060%
84
KuCoin
LINK-BTC$11.19
0.0044713 Eth
$11,271.48
1,007.690 LINK
0.0056%
85
HTX
LINK-BTC$11.26
0.0045011 Eth
$11,176.87
984.120 LINK
0.0055%
86
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$11.25
0.0044952 Eth
$11,131.14
1,006.754 0X5947BB275C521040051D82396192181B413227A3
0.0056%
87
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XD93F7E271CB87C23AAA73EDC008A79646D1F9912$11.26
0.0044998 Eth
$11,084.04
977.079 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0054%
88
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$11.13
0.0044498 Eth
$8,824.39
793.287 0X5947BB275C521040051D82396192181B413227A3
0.0044%
89
KuCoin
LINK-KCS$11.20
0.0044767 Eth
$7,309.00
652.661 LINK
0.0036%
90
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$11.19
0.0044721 Eth
$6,239.10
547.408 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0030%
91
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XC2132D05D31C914A87C6611C10748AEB04B58E8F$11.17
0.0044651 Eth
$4,459.35
392.248 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0022%
92
Uniswap V3 (Ethereum)
0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984-0X514910771AF9CA656AF840DFF83E8264ECF986CA$11.18
0.0044701 Eth
$3,046.70
404.337 0X1F9840A85D5AF5BF1D1762F925BDADDC4201F984
0.0022%
93
CoinEx
LINK-USDC$11.15
0.0044572 Eth
$2,282.99
201.425 LINK
0.0011%
94
CoinEx
LINK-BTC$11.19
0.0044764 Eth
$2,161.81
191.345 LINK
0.0011%
95
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$11.21
0.0044844 Eth
$1,663.64
147.696 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0008%
96
Uniswap V3 (Arbitrum One)
0X0C880F6761F1AF8D9AA9C466984B80DAB9A8C9E8-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$11.24
0.0044941 Eth
$1,241.59
258.430 0X0C880F6761F1AF8D9AA9C466984B80DAB9A8C9E8
0.0014%
97
Balancer V2 (Arbitrum)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$11.26
0.0045013 Eth
$990.16
87.765 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0005%
98
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFA7F8980B0F1E64A2062791CC3B0871572F1F7F0$11.21
0.0044815 Eth
$943.16
86.178 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0005%
99
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X8F3CF7AD23CD3CADBD9735AFF958023239C6A063$11.19
0.0044769 Eth
$537.13
47.404 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0003%
100
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0XB33EAAD8D922B1083446DC23F610C2567FB5180F$11.20
0.0044806 Eth
$151.74
13.824 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0001%

Contract Source Code Verified (Exact Match)

Contract Name:
LinkToken

Compiler Version
v0.4.16+commit.d7661dd9

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, Audited

Contract Source Code (Solidity)Audit Report

/**
 *Submitted for verification at Etherscan.io on 2017-09-23
*/

pragma solidity ^0.4.16;


/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
  function mul(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal constant 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 c;
  }

  function sub(uint256 a, uint256 b) internal constant returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}


/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  uint256 public totalSupply;
  function balanceOf(address who) constant returns (uint256);
  function transfer(address to, uint256 value) returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}
/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) constant returns (uint256);
  function transferFrom(address from, address to, uint256 value) returns (bool);
  function approve(address spender, uint256 value) returns (bool);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract ERC677 is ERC20 {
  function transferAndCall(address to, uint value, bytes data) returns (bool success);

  event Transfer(address indexed from, address indexed to, uint value, bytes data);
}

contract ERC677Receiver {
  function onTokenTransfer(address _sender, uint _value, bytes _data);
}

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

  mapping(address => uint256) balances;

  /**
  * @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) returns (bool) {
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    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) constant returns (uint256 balance) {
    return balances[_owner];
  }

}


/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * @dev https://github.com/ethereum/EIPs/issues/20
 * @dev 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)) 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) returns (bool) {
    var _allowance = allowed[_from][msg.sender];

    // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
    // require (_value <= _allowance);

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

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

  function decreaseApproval (address _spender, uint _subtractedValue) 
    returns (bool success) {
    uint oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue > oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

contract ERC677Token is ERC677 {

  /**
  * @dev transfer token to a contract address with additional data if the recipient is a contact.
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  * @param _data The extra data to be passed to the receiving contract.
  */
  function transferAndCall(address _to, uint _value, bytes _data)
    public
    returns (bool success)
  {
    super.transfer(_to, _value);
    Transfer(msg.sender, _to, _value, _data);
    if (isContract(_to)) {
      contractFallback(_to, _value, _data);
    }
    return true;
  }


  // PRIVATE

  function contractFallback(address _to, uint _value, bytes _data)
    private
  {
    ERC677Receiver receiver = ERC677Receiver(_to);
    receiver.onTokenTransfer(msg.sender, _value, _data);
  }

  function isContract(address _addr)
    private
    returns (bool hasCode)
  {
    uint length;
    assembly { length := extcodesize(_addr) }
    return length > 0;
  }

}

contract LinkToken is StandardToken, ERC677Token {

  uint public constant totalSupply = 10**27;
  string public constant name = 'ChainLink Token';
  uint8 public constant decimals = 18;
  string public constant symbol = 'LINK';

  function LinkToken()
    public
  {
    balances[msg.sender] = totalSupply;
  }

  /**
  * @dev transfer token to a specified address with additional data if the recipient is a contract.
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  * @param _data The extra data to be passed to the receiving contract.
  */
  function transferAndCall(address _to, uint _value, bytes _data)
    public
    validRecipient(_to)
    returns (bool success)
  {
    return super.transferAndCall(_to, _value, _data);
  }

  /**
  * @dev transfer token to a specified address.
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint _value)
    public
    validRecipient(_to)
    returns (bool success)
  {
    return super.transfer(_to, _value);
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   * @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
    validRecipient(_spender)
    returns (bool)
  {
    return super.approve(_spender,  _value);
  }

  /**
   * @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
    validRecipient(_to)
    returns (bool)
  {
    return super.transferFrom(_from, _to, _value);
  }


  // MODIFIERS

  modifier validRecipient(address _recipient) {
    require(_recipient != address(0) && _recipient != address(this));
    _;
  }

}

Contract Security Audit

Contract ABI

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Deployed Bytecode

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Swarm Source

bzzr://c5f438ff94e5ddaf2058efa0019e246c636c37a622e04bb67827c7374acad8d6
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