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      "author": "steemitboard",
      "body": "Congratulations @lkolisko! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@lkolisko/birthday2.png</td><td>Happy Birthday! - You are on the Steem blockchain for 2 years!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@lkolisko) and compare to others on the [Steem Ranking](https://steemitboard.com/ranking/index.php?name=lkolisko)_</sub>\n\n\n###### [Vote for @Steemitboard as a witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1) to get one more award and increased upvotes!",
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      "body": "Congratulations @lkolisko! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@lkolisko/birthday1.png</td><td>1 Year on Steemit</td></tr></table>\n\n<sub>_[Click here to view your Board of Honor](https://steemitboard.com/@lkolisko)_</sub>\n\n\n> Support [SteemitBoard's project](https://steemit.com/@steemitboard)! **[Vote for its witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1)** and **get one more award**!",
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      "author": "lkolisko",
      "body": "The zero-knowledge proof term appears more frequently with the hype of blockchain. It is not a simple concept to understand. Therefore I will try to explain it here in layman terms using an example. The example is based on Quisquater and Guillou (Crypto 89) explanation.\n\n![brangelina_mall_zkp.png](https://steemitimages.com/DQmcjxvFpAYQtnDdqrU2bpMwAR8P2vYZhwyaBGgKHHubHwZ/brangelina_mall_zkp.png)\n\nImagine a shopping mall like on the picture with only one entrance and door in the middle that opens with a secret phrase. Angelina wants to convince Brad she knows the secret without revealing it. She enters the mall leaving Brad outside and picks randomly right or left route until she gets to the door. She calls Brad’s mobile to enter the mall too. Brad does not know if she went right or left. He calls her back and tells her left or right. Angelina can arrive from left or right based on the command from Brad using the door if needed. From now on we will refer to this as the protocol.\n\nFor the first time, Brad has only 50% confidence that Angelina knows the secret. However, they keep repeating the exercise n-times. If she does not know the secret, then she would be able to cheat Brad only with probability 2<sup>-n</sup>. Therefore Brad is constantly gaining confidence, that Angelina knows the secret.\n\nWhy can’t Angelina simply make a round from left to right or vice versa to convince Brad? \n\nThe secret opening the door works only one way, and the whole point is to avoid revealing any other information than Angelina knows the secret. If Angelina would make round walk through the door, then it would be proof of knowledge and not the zero-knowledge proof.\n\nLet’s assume Brad has a video camera to record the protocol. He throws a coin to pick right or left randomly. Jennifer and Justin would like to make a similar tape to fool Brad. They can do guessing the coin throw, and recording Jennifer walk down the guessed path. If they guessed wrong, then they would just rewind the video. Form both videos it must no be possible to tell who knows the secret and which version is staged. The point is if there is indistinguishable simulation possible, then Brad does not learn anything more from the protocol.\n\nIn more formal definition, the protocol has to have the following properties to be considered Zero-knowledge proof.\n\n1. **Security** — Angelina’s impostor can comply with the protocol only overwhelmingly . small probability.\n2. **Completeness** — If Angelina knows the secret, then she passes the test.\n3. **Soundness** — If an impostor can fool Brad, then there must be an alternative way between left and right and anybody can use it.\n4. **Zero-Knowledge Property** — It is possible to create a simulation based on recorded protocol (Jennifer and Justin tape in this case) that Brad is not able to distinguish that from real protocol he executed with Angelina.\n\nHope my explanation helped you a bit to grasp the idea of Zero-Knowledge proof and what is the difference to knowledge-proof. I highly suggest to look around the internet for other examples (e.g., with Color balls… Angelina and colorblind Brad).\n\nSources\n* http://www.cse.scu.edu/~tschwarz/coen350/zkp.html\n* https://en.wikipedia.org/wiki/Talk%3AZero-knowledge_proof\n\nHappy Block Chaining!\n\n — Lukas",
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      "author": "phdmoon",
      "body": "Lukas, this isn't controversial at all and it is becoming a popular topic among consumer data experts. Follow me @phdmoon and understand how health care data is being used to improve health, outcomes and linked to monetary incentives.",
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{
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      "author": "steem-network",
      "body": "<html>\n<p>Congratulations <a href=\"/@lkolisko\" target=\"_blank\">@lkolisko</a>, you have decided to take the next big step with your first post! The Steem Network Team wishes you a great time among this awesome community.</p>\n<hr>\n<div class=\"pull-left\"><img src=\"https://steemitimages.com/DQmaAdLUJ3yaSkmcmWECWyPGPWcjfbCoZ8Tu4RM6H4DbjCi/steem-network-thumbs-up.gif\" alt=\"Thumbs up for Steem Network´s strategy\" title=\"I suggest Steem Network´s strategy\" width=\"320\" height=\"222\"></div>\n<h1>The proven road to boost your personal success in this amazing Steem Network</h1>\n<p>Do you already know that awesome content will get great profits by following these <a href=\"/steem-network/@steem-network/spread-your-posts-through-this-proven-strategy-and-get-great-profits-in-return--for-posts-created-at-2018-02-27\" target=\"_blank\" alt=\"Steem Network\" title=\"Follow Steem Network´s suggestions to boost your success\">simple steps</a>, that have been worked out by experts?</p>\n</html>",
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      "author": "cheetah",
      "body": "Hi! I am a robot. I just upvoted you! I found similar content that readers might be interested in:\nhttps://medium.com/@lkolisko/trading-customer-data-on-blockchain-8430e47178bf",
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      "body": "Customer data is the fuel of the money-making machines like Google and Facebook. Companies invest huge money into technology to collect, connect and understand the data to enable better targeting for the advertising business to sell back to customers.\n\nCustomer data and behavioral patterns are collected typically under the hood through user interaction with different services on the internet. Does blockchain technology have potential to take companies like Facebook and Google out of the picture or at least weaken their position?\n\n>What if customers would be able to trade their personal data same way as coins and tokens are traded today?\n\nCustomers could create profiles describing attributes interesting, e.g. an advertisement or any other research companies. Trusted authorities would verify these profiles (e.g., income, location) or potentially through some decentralized consensus algorithm by the network e.g. through p2p. Part of the profile would be a preference to whom and for how much profile owner is willing to expose the information and potentially which way including some ZKP protocols. Temporal identifier of such profile would be available through browser plugin while a customer is browsing the internet.\n\nSite owners could decide if and how much are willing to pay to get access to personal information and preferences of a person using their site, pay for that on the fly through a micro-transaction and in turn resell this information on advertising exchanges and display advertisement. Such information could be traded same way as today billions of dollars in cryptocurrencies flowing 24 hours a day through exchanges around the world.\n\nCustomers providing information would be gaining profit directly instead of indirectly through the free services today. Information buyers would gain trusted and more fine-grained information that would allow them to do their business better.\n\n>The __blockchain could enable a new incarnation of sharing economy model where__ instead of cars in Uber or apartments in Airbnb __personal information would be the subject of trade__.\n\nThis idea might sound a bit controversial, but the model could bring control over personal information back to people and let them decide if it is for sale and at what price.\n\n— Lukas",
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