ETH Price: $2,733.06 (+0.50%)
Gas: 0.822 Gwei

Transaction Details

Sponsored
ads MoonPay
Buy, sell and swap Ethereum with MoonPay.Buy Now!

Spend less on fees, more on crypto. Buy crypto easily with MoonPay Balance. 20M+ users trust MoonPay worldwide.

ads MetaMask
Manage your web3 everything with MetaMask. Try Now!

Ready to onboard to Ethereum? With MetaMask, you're in control.

ads eToro
One-stop crypto shop: trusted, simple & safe.

Don’t invest unless you’re prepared to lose all the money you invest.

Sponsored
ads Uphold
Trade, Swap & Manage 300+ Crypto Trade Now

Don’t invest unless you’re prepared to lose all the money you invest.

Sponsored
ads Сoins.game
100 free spins for registration. Spin now!

Everyday giveaways up to 100 ETH, Lucky Spins. Deposit BONUS 300% and Cashbacks!

ads BC.GAME
The Best ETH Casino Claim Now!

5000+ Slots & Live Casino Games, 50+cryptos. Register with Etherscan and get 760% deposit bonus. Win Big$, withdraw it fast.

ads Stake
200% Bonus, 100K Daily Giveaways, Instant Withdrawals Play Now!

Slots, Roulette, Poker & more - Proud sponsors of UFC, Everton & StakeF1 team!

Sponsored
ads BC.GAME
- The Best ETH Casino Claim Now!

5000+ Slots & Live Casino Games, 50+cryptos. Register with Etherscan and get 760% deposit bonus. Win Big$, withdraw it fast.

ads CryptoSlots
Play & Get 25 Free Spins at CryptoSlots Play Now

Anonymous play on awesome games - sign up now for 25 free jackpot spins - worth $100s!

ads CryptoWins
200% More Funds to Play on Us up to 4 BTC! Claim Now!

100s of games, generous bonuses, 20+ years of trusted gaming. Join CryptoWins & start winning today!

Transaction Hash:
0x342d2e4b2910c78250237ed91c3bb5da9c0351abe6a25614264e640be54b5e1a
Status:
Success
Block:
665359215237796 Block Confirmations
Timestamp:
2298 days ago (Nov-06-2018 10:39:38 AM UTC)
Sponsored:
From:
0x6f71c6581B4677D690892bdBE106Cd45F6c7665c
Interacted With (To):
0xc2239a0E1b0EB98d331D2887bac8858De308bFd3
[ 0xf8051700688b93b545b8be69a724d78ea62e98f4 Created ] 
[ 0xbde9a30faf48c487d3df556a6aa184a62bafaa2c Created ] 
[ 0x492caff826390d6b908e0c7042bae5c5e948b5b7 Created ] 
[ 0x65d8ef6d0f64772a54fe7ddff1a754329a47fa8d Created ] 
[ 0x38a846df1a820a8521d84ea6f06a42edf3ae0ab1 Created ] 
[ 0x07dd81881b72540411d320a73ae2f3854d3e69ef Created ] 
[ 0xc316415c0263c6cf0513f7909f0f08a21ff4962d Created ] 
[ 0xb1f3961d007c7d61a7f983dc47652deca74c99d7 Created ] 
[ 0x13a3402eb0b3dbdfa2a29a63f974c6bea113b8b8 Created ] 
[ 0x2e35556cc8f1286797029a908b96b5d84ad1d1aa Created ] 
[ 0x9ab5fd1a1685aa671cf37eed83fb6d73c1f5c2e0 Created ] 
[ 0xb0e1da357b0d19ca78440a4a57d981dd358f5f9f Created ] 
[ 0x0324f16eab392acde3b90442e703ee33b7c36b69 Created ] 
[ 0xf5051fe8ad4e94a75a8cde647d980a80c3ed2621 Created ] 
[ 0x91e5f17397162da6af03288545228e70fe75b9b2 Created ] 
[ 0x4511d0e88ab99f77848106fa39b33f283deced3d Created ] 
[ 0xc24fd8a87f5de0b36f5af03ec1f1d3063b0d9a3f Created ] 
[ 0xb60d06b474940ac77ab5a17c8d6caa4556cd28c6 Created ] 
[ 0xa3cebc360b52f07b50c2242e9548bb8565c65f3f Created ] 
[ 0xa32ff56f869034f5156fe28163895857720b8aca Created ] 
[ 0xe0c9685a9ebc357932fd0dce07091c2773983d7f Created ] 
SELF DESTRUCT
0xf8051700...EA62E98f4
SELF DESTRUCT
0xBdE9A30f...62BaFAa2c
SELF DESTRUCT
0x492CafF8...5E948B5B7
SELF DESTRUCT
0x65D8eF6d...29a47FA8d
SELF DESTRUCT
0x38a846Df...DF3AE0ab1
SELF DESTRUCT
0x07dd8188...54d3e69EF
SELF DESTRUCT
0xc316415C...21Ff4962D
SELF DESTRUCT
0xb1F3961D...CA74c99d7
SELF DESTRUCT
0x13a3402E...eA113b8B8
SELF DESTRUCT
0x2E35556C...84ad1D1aa
SELF DESTRUCT
0x9ab5Fd1A...3C1f5c2e0
SELF DESTRUCT
0xB0E1Da35...D358f5f9F
SELF DESTRUCT
0x0324f16E...3b7c36B69
SELF DESTRUCT
0xf5051fe8...0C3ED2621
SELF DESTRUCT
0x91e5f173...0fe75B9b2
SELF DESTRUCT
0x4511d0E8...83DecEd3d
SELF DESTRUCT
0xc24fD8a8...63b0D9A3f
SELF DESTRUCT
0xb60D06b4...556cD28C6
SELF DESTRUCT
0xA3cEBC36...565c65f3F
SELF DESTRUCT
0xA32Ff56F...7720B8aCa
SELF DESTRUCT
0xE0C9685a...773983d7f
ERC-20 Tokens Transferred: 42
Value:
0 ETH ($0.00)
Transaction Fee:
0.0161259 ETH $44.07
Gas Price:
10 Gwei (0.00000001 ETH)
Ether Price:
$219.56 / ETH
Gas Limit & Usage by Txn:
3,000,000 | 1,612,590 (53.75%)
Other Attributes:
Nonce: 102 Position In Block: 7
Input Data:
Private Note:
To access the Private Note feature, you must be Logged In

The contract call From 0x6f71c658...5F6c7665c To 0xc2239a0E...De308bFd3 produced 42 Internal Transactions

Type Trace Address From   To Value Gas Limit
create_00xc2239a0E...De308bFd3 0xf8051700...EA62E98f40 ETH2,900,711
self_destruct_0_30xf8051700...EA62E98f4 0x175e8ca2...733e0B6e10 ETH0
create_10xc2239a0E...De308bFd3 0xBdE9A30f...62BaFAa2c0 ETH2,787,720
self_destruct_1_30xBdE9A30f...62BaFAa2c 0x175e8ca2...733e0B6e10 ETH0
create_20xc2239a0E...De308bFd3 0x492CafF8...5E948B5B70 ETH2,674,728
self_destruct_2_30x492CafF8...5E948B5B7 0x175e8ca2...733e0B6e10 ETH0
create_30xc2239a0E...De308bFd3 0x65D8eF6d...29a47FA8d0 ETH2,561,737
self_destruct_3_30x65D8eF6d...29a47FA8d 0x175e8ca2...733e0B6e10 ETH0
create_40xc2239a0E...De308bFd3 0x38a846Df...DF3AE0ab10 ETH2,448,746
self_destruct_4_30x38a846Df...DF3AE0ab1 0x175e8ca2...733e0B6e10 ETH0
create_50xc2239a0E...De308bFd3 0x07dd8188...54d3e69EF0 ETH2,335,754
self_destruct_5_30x07dd8188...54d3e69EF 0x175e8ca2...733e0B6e10 ETH0
create_60xc2239a0E...De308bFd3 0xc316415C...21Ff4962D0 ETH2,222,763
self_destruct_6_30xc316415C...21Ff4962D 0x175e8ca2...733e0B6e10 ETH0
create_70xc2239a0E...De308bFd3 0xb1F3961D...CA74c99d70 ETH2,109,771
self_destruct_7_30xb1F3961D...CA74c99d7 0x175e8ca2...733e0B6e10 ETH0
create_80xc2239a0E...De308bFd3 0x13a3402E...eA113b8B80 ETH1,996,780
self_destruct_8_30x13a3402E...eA113b8B8 0x175e8ca2...733e0B6e10 ETH0
create_90xc2239a0E...De308bFd3 0x2E35556C...84ad1D1aa0 ETH1,883,788
self_destruct_9_30x2E35556C...84ad1D1aa 0x175e8ca2...733e0B6e10 ETH0
create_100xc2239a0E...De308bFd3 0x9ab5Fd1A...3C1f5c2e00 ETH1,770,797
self_destruct_10_30x9ab5Fd1A...3C1f5c2e0 0x175e8ca2...733e0B6e10 ETH0
create_110xc2239a0E...De308bFd3 0xB0E1Da35...D358f5f9F0 ETH1,657,805
self_destruct_11_30xB0E1Da35...D358f5f9F 0x175e8ca2...733e0B6e10 ETH0
create_120xc2239a0E...De308bFd3 0x0324f16E...3b7c36B690 ETH1,544,814
self_destruct_12_30x0324f16E...3b7c36B69 0x175e8ca2...733e0B6e10 ETH0
create_130xc2239a0E...De308bFd3 0xf5051fe8...0C3ED26210 ETH1,431,822
self_destruct_13_30xf5051fe8...0C3ED2621 0x175e8ca2...733e0B6e10 ETH0
create_140xc2239a0E...De308bFd3 0x91e5f173...0fe75B9b20 ETH1,318,831
self_destruct_14_30x91e5f173...0fe75B9b2 0x175e8ca2...733e0B6e10 ETH0
create_150xc2239a0E...De308bFd3 0x4511d0E8...83DecEd3d0 ETH1,205,839
self_destruct_15_30x4511d0E8...83DecEd3d 0x175e8ca2...733e0B6e10 ETH0
create_160xc2239a0E...De308bFd3 0xc24fD8a8...63b0D9A3f0 ETH1,092,848
self_destruct_16_30xc24fD8a8...63b0D9A3f 0x175e8ca2...733e0B6e10 ETH0
create_170xc2239a0E...De308bFd3 0xb60D06b4...556cD28C60 ETH979,856
self_destruct_17_30xb60D06b4...556cD28C6 0x175e8ca2...733e0B6e10 ETH0
create_180xc2239a0E...De308bFd3 0xA3cEBC36...565c65f3F0 ETH866,865
self_destruct_18_30xA3cEBC36...565c65f3F 0x175e8ca2...733e0B6e10 ETH0
create_190xc2239a0E...De308bFd3 0xA32Ff56F...7720B8aCa0 ETH753,873
self_destruct_19_30xA32Ff56F...7720B8aCa 0x175e8ca2...733e0B6e10 ETH0
create_200xc2239a0E...De308bFd3 0xE0C9685a...773983d7f0 ETH640,875
self_destruct_20_30xE0C9685a...773983d7f 0x175e8ca2...733e0B6e10 ETH0
AA Txn Hash Method Position From Internal Txns Token Txns NFT Txns Txn Fee (ETH) Gas Limit
Transaction Receipt Event Logs
2
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
3
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
4
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
5
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
6
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
7
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
8
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
9
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
10
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
11
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
12
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
13
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
14
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
15
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
16
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
17
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
18
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
19
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
20
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
21
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
22
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
23
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
24
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
25
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
26
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
27
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
28
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
29
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
30
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
31
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
32
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
33
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
34
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
35
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
36
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
37
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
38
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
39
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
40
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
41
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
42
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
43
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
44
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
45
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
46
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
47
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
48
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
49
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
50
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
51
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
52
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
53
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
54
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
55
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
56
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
57
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
58
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
59
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
60
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
61
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
62
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Distr (index_topic_1 address to, uint256 amount)View Source

Topics
Data
  • amount :250000000000
63
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000
64
Address
0x399934a1b63154c825e518c68b7da2147d6cb0c9
Name

Transfer (index_topic_1 address _from, index_topic_2 address _to, uint256 _value)View Source

Topics
Data
  • _value :250000000000

                

            


            

                

                    

                        
Loading

                    

                    

                        
                    

                

            


            
            

                

                    

                        
Loading

                    

                    

                        
                    

                

            

            

            

                

                    

                        
Loading

                    

                    

                        
                    

                

            


            
        

        

        
        

            

                 
                A transaction is a cryptographically signed instruction that changes the blockchain state. Block explorers track the details of all transactions in the network. Learn more about transactions in our Knowledge Base.