ETH Price: $2,367.30 (-4.21%)

Token

ChainLink Token (LINK)
 

Overview

Max Total Supply

1,000,000,000 LINK

Holders

721,137 ( 0.008%)

Market

Price

$10.55 @ 0.004457 ETH (-3.98%)

Onchain Market Cap

$10,550,000,000.00

Circulating Supply Market Cap

$6,608,024,837.00

Other Info

Token Contract (WITH 18 Decimals)

Filtered by Token Holder
HashKey Exchange 2
Balance
492.30694563461218606 LINK

Value
$5,193.84 ( ~2.1940 Eth) [0.0000%]
0xcbea7739929cc6a2b4e46a1f6d26841d8d668b9e
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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 9490.91% |ETH 0.0003846 1058.87%

Market

Volume (24H):$487,532,423.00
Market Capitalization:$6,608,024,837.00
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
LBank
LINK-USDT$10.54
0.0044442 Eth
$37,039,847.00
3,515,041.300 LINK
15.8559%
2
Binance
LINK-USDT$10.56
0.0044537 Eth
$33,764,204.00
3,101,859.480 LINK
13.9921%
3
WhiteBIT
LINK-USDT$10.55
0.0044457 Eth
$21,215,692.00
2,010,335.990 LINK
9.0683%
4
Bybit
LINK-USDT$10.55
0.0044479 Eth
$19,877,828.00
1,820,512.535 LINK
8.2121%
5
Coinbase Exchange
LINK-USD$10.54
0.0044461 Eth
$17,683,691.00
1,677,451.200 LINK
7.5668%
6
HTX
LINK-USDT$10.53
0.0044414 Eth
$16,472,838.00
1,496,021.974 LINK
6.7483%
7
Bitget
LINK-USDT$10.56
0.0044467 Eth
$9,272,676.00
847,155.777 LINK
3.8214%
8
Slex
LINK-USDT$10.57
0.0044510 Eth
$6,526,984.00
593,324.530 LINK
2.6764%
9
P2B
LINK-USDT$10.54
0.0044442 Eth
$6,456,241.00
612,690.260 LINK
2.7638%
10
OKX
LINK-USDT$10.57
0.0044446 Eth
$6,005,373.00
550,172.491 LINK
2.4818%
11
Azbit
LINK-USDT$10.56
0.0044463 Eth
$5,326,626.00
484,110.862 LINK
2.1838%
12
DigiFinex
LINK-USDT$10.54
0.0044405 Eth
$4,271,664.00
405,241.580 LINK
1.8280%
13
Biconomy.com
LINK-USDT$10.59
0.0044537 Eth
$4,185,677.00
380,359.440 LINK
1.7157%
14
KuCoin
LINK-USDT$10.56
0.0044453 Eth
$3,914,452.00
370,739.830 LINK
1.6724%
15
XT.COM
LINK-USDT$10.55
0.0044409 Eth
$3,186,034.00
293,095.390 LINK
1.3221%
16
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$10.53
0.0044304 Eth
$2,678,085.00
253,044.239 0X514910771AF9CA656AF840DFF83E8264ECF986CA
1.1414%
17
ProBit Global
LINK-USDT$10.56
0.0044482 Eth
$2,623,841.00
248,484.801 LINK
1.1209%
18
CoinW
LINK-USDT$10.56
0.0044406 Eth
$2,530,761.00
239,697.360 LINK
1.0812%
19
Coinstore
LINK-USDT$10.57
0.0044445 Eth
$2,062,629.00
189,042.330 LINK
0.8527%
20
Trubit
LINK-USDT$10.59
0.0044523 Eth
$1,776,098.00
162,963.410 LINK
0.7351%
21
Kraken
LINK-USD$10.56
0.0044445 Eth
$1,754,491.00
166,197.522 LINK
0.7497%
22
WhiteBIT
LINK-BTC$10.58
0.0044548 Eth
$1,707,393.00
161,454.950 LINK
0.7283%
23
AscendEX (BitMax)
LINK-USDT$10.58
0.0044635 Eth
$1,633,983.00
154,394.400 LINK
0.6965%
24
BYDFi
LINK-USDT$10.58
0.0044524 Eth
$1,594,355.00
150,765.080 LINK
0.6801%
25
Bitunix
LINK-USDT$10.55
0.0044446 Eth
$1,593,620.00
151,112.630 LINK
0.6816%
26
FameEX
LINK-USDT$10.56
0.0044419 Eth
$1,346,428.00
123,718.668 LINK
0.5581%
27
BTSE
LINK-USDT$10.55
0.0044438 Eth
$1,220,634.00
115,681.108 LINK
0.5218%
28
Dex-Trade
LINK-USDT$10.59
0.0044569 Eth
$1,088,336.00
102,723.630 LINK
0.4634%
29
FMCPAY
LINK-USDT$10.55
0.0044425 Eth
$1,035,402.00
94,603.898 LINK
0.4267%
30
Azbit
LINK-ETH$10.57
0.0044487 Eth
$893,024.00
83,830.532 LINK
0.3781%
31
Bitexen
LINK-USDT$10.58
0.0044501 Eth
$842,749.00
79,665.190 LINK
0.3594%
32
Bitvavo
LINK-EUR$10.56
0.0044481 Eth
$791,484.00
74,958.076 LINK
0.3381%
33
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$10.54
0.0044352 Eth
$762,528.00
70,550.101 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.3182%
34
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$10.51
0.0044202 Eth
$743,465.00
70,186.702 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.3166%
35
Bitexen
LINK-TRY$10.59
0.0044542 Eth
$702,461.00
66,343.060 LINK
0.2993%
36
FMCPAY
LINK-BTC$10.55
0.0044443 Eth
$636,946.00
58,409.600 LINK
0.2635%
37
WhiteBIT
LINK-EUR$10.53
0.0044368 Eth
$602,911.00
57,244.370 LINK
0.2582%
38
FMCPAY
LINK-ETH$10.56
0.0044492 Eth
$601,273.00
56,425.920 LINK
0.2545%
39
tanX
LINK-USDC$10.54
0.0044477 Eth
$571,891.00
52,066.690 LINK
0.2349%
40
BigONE
LINK-USDT$10.58
0.0044539 Eth
$557,127.00
52,642.230 LINK
0.2375%
41
PointPay
LINK-USDT$10.56
0.0044400 Eth
$533,715.00
49,071.440 LINK
0.2214%
42
LATOKEN
LINK-USDT$10.55
0.0044401 Eth
$476,772.00
45,171.194 LINK
0.2038%
43
ProBit Global
LINK-BTC$10.55
0.0044455 Eth
$422,010.00
39,990.455 LINK
0.1804%
44
CoinEx
LINK-USDT$10.56
0.0044496 Eth
$405,995.00
37,073.723 LINK
0.1672%
45
Quickswap (v3)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$10.53
0.0044351 Eth
$384,375.00
36,203.639 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1633%
46
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$10.51
0.0044216 Eth
$384,001.00
36,295.073 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.1637%
47
Bybit
LINK-USDC$10.54
0.0044443 Eth
$368,876.00
33,924.382 LINK
0.1530%
48
Phemex
LINK-USDT$10.57
0.0044440 Eth
$356,576.00
33,742.460 LINK
0.1522%
49
EXMO
LINK-USDT$10.57
0.0044493 Eth
$347,370.00
32,856.688 LINK
0.1482%
50
Binance
LINK-BRL$10.65
0.0044860 Eth
$299,524.00
27,538.890 LINK
0.1242%
51
EarnBIT
LINK-USDT$10.61
0.0044606 Eth
$284,443.00
25,998.173 LINK
0.1173%
52
LATOKEN
LINK-BTC$10.55
0.0044448 Eth
$232,051.00
21,992.654 LINK
0.0992%
53
Bitbank
LINK-JPY$10.58
0.0044503 Eth
$209,548.00
19,807.865 LINK
0.0894%
54
BitDelta
LINK-USDT$10.56
0.0044453 Eth
$178,435.00
16,286.000 LINK
0.0735%
55
OKX
LINK-USDC$10.51
0.0044230 Eth
$177,073.00
16,260.819 LINK
0.0734%
56
Nonkyc.io
LINK-USDT$10.54
0.0044358 Eth
$164,762.00
15,054.269 LINK
0.0679%
57
BitMart
LINK-BTC$10.57
0.0044467 Eth
$164,191.00
15,539.160 LINK
0.0701%
58
BYDFi
LINK-USDC$10.55
0.0044442 Eth
$148,701.00
14,094.920 LINK
0.0636%
59
Camelot V3
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$10.56
0.0044467 Eth
$146,944.00
13,907.430 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0627%
60
Uniswap V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$10.56
0.0044444 Eth
$140,951.00
12,929.596 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0583%
61
PancakeSwap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$10.57
0.0044503 Eth
$119,076.00
11,008.733 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0497%
62
Gemini
LINK-USD$10.57
0.0044494 Eth
$118,493.00
11,212.260 LINK
0.0506%
63
Bitci TR
LINK-TRY$10.53
0.0044306 Eth
$109,873.00
9,960.570 LINK
0.0449%
64
Slex
LINK-BTC$10.55
0.0044448 Eth
$106,926.00
9,859.000 LINK
0.0445%
65
Binance
LINK-TRY$10.57
0.0044629 Eth
$106,409.00
9,745.640 LINK
0.0440%
66
Coinbase Exchange
LINK-GBP$10.56
0.0044542 Eth
$104,076.00
9,854.420 LINK
0.0445%
67
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$10.57
0.0044495 Eth
$99,034.00
9,090.508 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0410%
68
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$10.50
0.0044202 Eth
$97,903.00
101,916.917 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.4597%
69
Uniswap V3 (Polygon)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$10.51
0.0044216 Eth
$94,721.00
98,366.019 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.4437%
70
WhiteBIT
LINK-TRY$10.58
0.0044587 Eth
$85,701.00
8,096.970 LINK
0.0365%
71
Coinbase Exchange
LINK-ETH$10.57
0.0044576 Eth
$80,183.00
7,586.500 LINK
0.0342%
72
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X7CEB23FD6BC0ADD59E62AC25578270CFF1B9F619$10.56
0.0044437 Eth
$79,319.00
7,489.515 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0338%
73
GMO Japan
LINK-JPY$10.57
0.0044479 Eth
$75,252.00
7,120.100 LINK
0.0321%
74
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$10.54
0.0044405 Eth
$71,552.00
6,572.813 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0296%
75
PointPay
LINK-BTC$10.58
0.0044501 Eth
$68,202.00
6,282.732 LINK
0.0283%
76
Slex
LINK-ETH$10.55
0.0044452 Eth
$64,597.00
6,072.780 LINK
0.0274%
77
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0XFD086BC7CD5C481DCC9C85EBE478A1C0B69FCBB9$10.51
0.0044202 Eth
$64,393.00
5,940.709 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0268%
78
Solidly V3 (Ethereum)
0X514910771AF9CA656AF840DFF83E8264ECF986CA-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$10.61
0.0044646 Eth
$59,915.00
5,713.052 0X514910771AF9CA656AF840DFF83E8264ECF986CA
0.0258%
79
Bitget
LINK-EUR$10.56
0.0044503 Eth
$53,939.00
4,910.070 LINK
0.0221%
80
LATOKEN
LINK-ETH$10.60
0.0044642 Eth
$53,190.00
5,019.197 LINK
0.0226%
81
Mercado Bitcoin
LINK-BRL$10.64
0.0044727 Eth
$46,262.00
4,349.878 LINK
0.0196%
82
Foxbit
LINK-BRL$10.64
0.0044730 Eth
$45,933.00
4,207.238 LINK
0.0190%
83
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$10.52
0.0044281 Eth
$42,191.00
3,917.351 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0177%
84
EXMO
LINK-BTC$10.58
0.0044475 Eth
$40,510.00
3,830.434 LINK
0.0173%
85
Quickswap (v3)
0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359-0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39$10.53
0.0044283 Eth
$37,808.00
39,205.986 0X3C499C542CEF5E3811E1192CE70D8CC03D5C3359
0.1769%
86
Uniswap V3 (Optimism)
0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6-0X4200000000000000000000000000000000000006$10.53
0.0044286 Eth
$37,274.00
3,553.495 0X350A791BFC2C21F9ED5D10980DAD2E2638FFA7F6
0.0160%
87
Kanga
LINK-PLN$10.56
0.0044452 Eth
$34,152.00
0.000 LINK
0.0000%
88
Bitso
LINK-USD$10.54
0.0044327 Eth
$33,126.00
3,143.698 LINK
0.0142%
89
Uniswap V3 (Arbitrum One)
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X2F2A2543B76A4166549F7AAB2E75BEF0AEFC5B0F$10.55
0.0044384 Eth
$31,351.00
2,899.452 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0131%
90
Uniswap V3 (Polygon)
0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39-0X1BFD67037B42CF73ACF2047067BD4F2C47D9BFD6$10.55
0.0044387 Eth
$19,789.95
1,829.338 0X53E0BCA35EC356BD5DDDFEBBD1FC0FD03FABAD39
0.0083%
91
Binance US
LINK-USDT$10.55
0.0044404 Eth
$19,777.52
1,874.416 LINK
0.0085%
92
THENA FUSION
0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827-0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD$10.54
0.0044398 Eth
$15,041.49
26.154 0X52F24A5E03AEE338DA5FD9DF68D2B6FAE1178827
0.0001%
93
Uniswap V3 (Arbitrum One)
0XAF88D065E77C8CC2239327C5EDB3A432268E5831-0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4$10.51
0.0044202 Eth
$13,539.85
14,053.775 0XAF88D065E77C8CC2239327C5EDB3A432268E5831
0.0634%
94
Pangolin
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$10.55
0.0044414 Eth
$13,051.04
1,240.477 0X5947BB275C521040051D82396192181B413227A3
0.0056%
95
KuCoin
LINK-KCS$10.56
0.0044460 Eth
$12,221.42
1,157.312 LINK
0.0052%
96
LFJ
0X5947BB275C521040051D82396192181B413227A3-0XB31F66AA3C1E785363F0875A1B74E27B85FD66C7$10.55
0.0044438 Eth
$10,483.94
998.321 0X5947BB275C521040051D82396192181B413227A3
0.0045%
97
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X55D398326F99059FF775485246999027B3197955$10.52
0.0044316 Eth
$8,304.16
761.316 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0034%
98
zondacrypto
LINK-PLN$10.58
0.0044543 Eth
$7,726.39
729.988 LINK
0.0033%
99
Ramses V2
0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4-0X82AF49447D8A07E3BD95BD0D56F35241523FBAB1$10.52
0.0044326 Eth
$6,027.33
566.809 0XF97F4DF75117A78C1A5A0DBB814AF92458539FB4
0.0026%
100
Uniswap V3 (BSC)
0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD-0X2170ED0880AC9A755FD29B2688956BD959F933F8$10.58
0.0044711 Eth
$5,205.87
491.602 0XF8A0BF9CF54BB92F17374D9E9A321E6A111A51BD
0.0022%

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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