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      "title": "去中心化交易所必将前程似锦",
      "body": "进入2018年，虽然只有短短1个多月的时间，但是已经有两家大型的数字资产交易所受到攻击，导致大量用户数字资产遭受损失：\n\n2月中旬，意大利的一家数字货币交易所BitGrail，由于受到黑客攻击，损失了价值1.7亿美元的NANO代币。\n\n1月中旬，日本交易所Coincheck的钱包，遭受到网络攻击损失了价值5.34亿美元的数字代币。\n\n可见安全性对于区块链资产交易所是多么地重要！\n\n区块链资产交易所，作为链接法定货币和数字货币，帮助客户保存数字资产，为客户提供资产兑换的场所，其安全性、可靠性极为重要，一旦发生风险，极有可能导致大量的财产损失。\n\n当前主流的区块链资产交易所，如poloniex、Binance、bitfinex等，与传统的金融机构类似，作为核心的交易节点，保存用户大量的资金，必然会受社会的高度关注，容易受到黑客的攻击。\n\n区块链技术，本身就具有去中心化、分布式存储的特点，区块链资产交易所，理所当然地可以利用区块链技术打造。\n\n如能充分利用区块链技术优势，打造去中心化的数字资产交易所，让客户自己真正保管自己的资产，必然具有极大的优势。\n\n1.去中心化交易所数据公开透明，安全可靠\n在去中心化交易所中，交易所无法触碰用户的区块链资产，所有数据公开透明，交易所也无法实时了解交易用户手中的筹码，因而无法设定或者影响交易价格，避免了传统的中心化交易所中时常发生的坐庄，操纵市场，赚取差价的可能。\n\n基于区块链技术的去中心化交易所，通过把交易信息写入区块链，实现了公开透明、自证公平的交易机制，来确保平台用户自身保管用户资产。\n\n2. 去中心化交易所业务模式简单，成本低\n去中心化交易所，通过智能合约，确保交易规则公开公正地执行，业务模式简单清晰。\n去中心化交易只需承担主要的资产托管、撮合交易及资产清算。而不需要承担像中心化交易所所需要承担的非交易的功能像账户体系、KYC、法币兑换等等，用户的操作成本很低。\n\n所有的交易都通过自动化的智能合约来实现，通过区块链技术可以将资产托管、撮合交易、资产清算都放在区块链上，交易成本很低。\n\n3. 去中心化交易所通过发行代币，提高竞争力\n\n以往，我们大多人可能会想：如果交易所是去中心化了，那么交易所怎么赚钱呢？\n\n现在基于区块链技术的通行证模式，为交易所业务创新和盈利增长，提供了创新的解决方案。\n\n去中心化数字资产交易所，可以利用ETH发行基于区块链技术的代币，创新区块链资产交易所业务模式。\n\n一来，代币可以作为交易所的基础货币，与其它数字资产形成比对；二来交易所依然可以利用自己发行的代币收取手续费。\n\n去中心化交易所发行的代币，像血液一样，在整个交易所内循环流动。项目团队作为代币的最大持有者，必然能获得极大的利益。\n\n目前由于区块链技术仍然还处于发展的初级阶段，去中心化交易所还存在很多不确定性。\n\n未来随着区块链技术的不断成熟，去中心化交易所必将在安全、效率和用户体验等方面拥有很大的提升空间，迎来更加广阔的发展空间！",
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      "title": "现在，就是参与区块链的好时机",
      "body": "最近币圈大幅调整，相信很多币圈的投资者都难以沉浸在春节的欢乐气氛中。\n\n有不少投资者，由于账户市值缩水严重，信心已经开始动摇，甚至怀疑区块链行业的未来。\n\n其实数字货币作为一个新生事物，截止目前仍然是区块链最成功的应用，其涨跌受市场多方面的影响。只要区块链行业有价值，数字货币就不会消失。\n\n\n在行情大跌的时候，我们不妨静下心来，深入研究一下区块链行业的本质和内涵，做好行业研究和分析，努力抓住下一波的发展机会。\n\n这里我们不妨梳理一下最近发生的一些重大事项，帮助我们更好地认识区块链行业的发展。\n\n1.主权国家发行数字货币\n\n2018年2月20日，全球第一个法定数字货币诞生。\n\n委内瑞拉正式预售该国发行的“石油币”(Petro)，这是目前人类历史上的第一个主权国家发行的法定数字货币。\n\n委内瑞拉利用区块链技术发行数字货币，势必会引发全球各国政府的的密切关注。\n\n2. 互联网巨头涉足区块链\n\n在最近一个多月内，我们看到国内互联网巨头纷纷涉足区块链行业。\n\n百度推出基于区块链技术的莱茨狗，与以太坊上的CryptoKitties 类似。\n\n网易金融发布网易星球，与公信宝布洛克城类似。\n\n美图发行代币BEC，遨游推出浏览器挖矿。\n\n顶级的互联网公司都在积极参与区块链应用，这势必吸引更多产业资源涌入区块链。\n\n3. 传统资本大鳄跑步入场\n\n关注区块链行业的朋友，一定会被春节期间国内第一大区块链社群：「三点钟区块链」刷爆朋友圈。很多媒体对其中讨论，给与了大量的报道，其中我们能看到蔡文胜、薛蛮子、李开复等知名大咖都纷纷看好区块链，甚至要Allin 其中。\n\n就在不久前，国内知名投资人徐小平，曾在真格内部呼吁被投公司去拥抱区块链革命、学习区块链技术。他建议各大创业者们，在立身自身业务的同时，要了解区块链，理解ICO，进入区块链时代。对区块链不要有怀疑，不要有迟疑，立即动员全体员工拥抱区块链。\n\n通过以上梳理的事件，我们可以明确的看到，区块链行业已经得到上层建筑和主流资本的高度认可，可以预计未来区块链行业将进入快速发展期。\n\n自2016 年，区块链第一次出现在 Gartner 曲线上，区块链行业正在沿着Gartner曲线快速向前推进。\n\n从2009年初比特币诞生至2015年中旬以太坊Frontier版本发布，大致可以认定区块链处于科技诞生的促动期。\n\n2015年下半年后到至今，随着ICO的大爆发，大量DAPP涌现，大致可以认定区块链处于期望高峰期。\n\n2017 年下半年 94事件后，各类交易所被盗事件的爆发，数字资产大幅下跌，大致可以认定区块链正在滑向泡沫破裂的谷底期。\n![gartner.png](https://steemitimages.com/DQmUP1bV2zjZCmbTQwmYjDRnroegVot7z9Bwyd5oA9vab8a/gartner.png)\n当前随着数字货币的大幅调整，市场将挤掉部分泡沫，区块链行业即将进入发展的深水区，在一定程度上有利于区块链行业未来发展更加健康更加理性。\n进入2018年以来，随着主流媒体的不断报道，产业不断融合促进，资本的推动，社会各界都在纷纷讨论区块链的内涵和应用场景，区块链行业将会比互联网行业具有更快的发展速度，更大的爆发力，快速向前推进。\n\n一旦区块链领域出现PayPal、微信、twitter等简单易用的杀手级产品，将会迅速席卷市场，打开区块链行业快速发展的大门。\n\n由于目前仍旧有大量新人涌入，预计此次调整不会持续很长时间。一旦调整结束，区块链将进入快速增长阶段，普通人将很难有机会再参与其中。\n\n因此，强烈建议大家抓住机会，莫失良机，积极参与。",
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      "body": "it is very excited to me .",
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      "body": "Hi! I am a robot. I just upvoted you! I found similar content that readers might be interested in:\nhttps://www.reddit.com/r/siacoin/comments/6inbcl/the_efficacy_of_sybil_attacks_on_sia_eli5/",
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      "body": "Excellent breakdown of SIA. Thanks!",
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      "title": "How sia works",
      "body": "Sia is a network for remotely storing data. Typically called 'cloud storage', the core feature is that you can put data on the network and it will be available from anywhere in the world at a later date. Putting data onto a network means that someone else - a 'host' - is going to be storing the data, and is going to be responsible for returning the data when requested. Sia makes several key assumptions about the network:\n\nHosts cannot be trusted - if they are able, they will spy, steal, and cheat. Strong mechanisms must be used to discourage and prevent malice.\nHosts are not charitable - hosts need to be paid, especially if the data is private or is large in volume. Payment must be guaranteed.\nHosts are unstable - a single host, and even a group of hosts, is liable to go offline even if they have a history of 100% reliability\nThe network is hostile - if there is a way to be abusive, someone will discover it and cause abuse.\nSia is able to safely store data on a network that has the above properties. There are three core strategies employed by Sia to ensure the safety of data. The first is encryption, which serves to protect the privacy of the data even when the hosts are trying to view the data. All data on Sia is encrypted before it is ever sent over the network, and it is only decrypted after it has been downloaded. The hosts will never be able to view decrypted data. The second strategy is redundancy. Data is not given to one or two or three hosts, but instead a myriad of hosts. Using erasure coding techniques such as Reed-Solomon coding, a high reliability can be achieved even without a high redundancy. The final strategy is to align the incentives of the hosts by paying them only if they store the data, but also by guaranteeing that they will get paid for storing the data, even if the renter is not online to make the payment. This can be achieved using a file contract, and a file contract can be achieved using a blockchain.\n\nA file contract is an agreement between a renter and a host. The renter agrees to pay the host for storing a file, and the host agrees to store the file for a certain period of time. The renter and the host both put money into the file contract at the beginning. The money from the renter will be payment for the host after the contract is fulfilled. The money from the host is collateral that the host will forfeit if the contract is not completed. The file contract goes onto the blockchain, which will serve as escrow. When the file contract is over, the host must provide a proof of storage to the blockchain proving that the file is still being stored. After the proof of storage is provided, the host's collateral is returned and the renter's payment is made to the host. If the proof of storage is not provided in time, the money is forfeit.\n\nThe file contract is enough to provide strong incentives that the host keep the file. Keeping the file provides a financial income, and losing the file results in a financial penalty. For the act of storing data, a combination of encryption and the file contract covers the first two bullet points (hosts cannot be trusted and are not charitable). There is still no guarantee that the host will not be holding the data hostage, protections against this are discussed later.\n\nThe renter does not want to rely on a single host, even with all of the financial incentives and commitments in place. The inescapable truth is that a single host is always at risk of unexpected downtime or failure (even if the host is trustworthy). This risk can be minimized by storing the data on multiple hosts. If the full data is stored on 3 hosts, then all 3 hosts would need to go offline simultaneously in order for the data to be lost. It turns out however, that we can do substantially better than 1-of-3. Reed Solomon coding provides a way to store data such that M-of-N hosts can be used to recover data, and the redundancy is only N/M (which is theoretically perfect). Instead of 1-of-3, we can do 10-of-30 for the same redundancy of 3x. Switching to 10-of-30 gives us enormous reliability benefits - the chances that 21 drives out of 30 fail is substantially lower than the chances that 3 out of 3 drives fail. It turns out that if your hosts have 95% uptime, a 10-of-30 scheme provides a file uptime exceeding 99.999999999%. This math does assume that the hosts will be failing independently, but carefully selecting hosts by region should provide reasonable independence. If the hosts have 98% uptime (allowing for 30 minutes of down time every day, or 15 hours every month), the file can hit 99.999999999% with a 18-of-30 scheme, only 1.66x redundancy. This allows for incredible cost savings, greater insulation against attackers, and provides a large pool of hosts that can be used to download files with high parallelism.\n\nThis redundancy also provides insulation against hosts who may try to hold data hostage. In a 10-of-30 scheme, you only need 10 hosts to recover your data. Downloads on Sia are paid, which means a host gets revenue every time you download data from them. If 1 or even 15 hosts are malicious and try to hold data hostage, they can be fully ignored and instead the non-malicous hosts can be used. This has a direct opportunity cost for the malicious hosts - they lose revenue from the downloads. Even further, the renters will blacklist hosts if their download prices are consistently too high. The combined pressures of being unlikely to succeed, losing out on immediate revenue, and losing out on future revenue (in the form of future uploads + downloads) means that hosts are unlikely to perform this attack (and even if they do, it's not a big deal - just ignore them and use the honest hosts). Highly paranoid renters can get further protections by using a 3-of-30 or even something like a 2-of-100 scheme (which has high redundancy overhead) to protect their most sensitive files. In all likelihood though, 10-of-30 is already sufficient even for the most sensitive files. In practice, we've seen files maintain perfect reliability even during buggy prototype releases where average host reliability was below 50%.\n\nRenters continuously observe the blockchain and the network to verify the uptime and reliability of hosts. Renters have a strong preference for hosts that are reliable, fast, and low-cost. Additionally, the renter typically only ever uploads to a small percentage of the total number of hosts. This creates a heavy pressure on hosts to perform better. The exact algorithm is still being determined.\n\nAt this point we've covered our bases for 3 of the original points (untrustworthy hosts, non-charitable hosts, and unstable hosts), both for uploading data and for being able to retrieve it. The vast majority of Sia heavily protected against malicious attackers. The Sia blockchain very closely resembles the Bitcoin blockchain, preserving the Proof-of-Work consensus mechanism, preserving the 10 minute blocktimes, and in general copying the Bitcoin blockchain wherever possible. A few well-known bugs (such as transaction malleability) have been fixed, but otherwise the design decisions of the Sia blockchain match the Bitcoin blockchain as much as possible. A strong form of encryption is used (Twofish with 256 bit keys), and all protocols in Sia assume that the other party is going to start behaving maliciously at any moment.\n\nThere is only one significant remaining problem, which is host selection. Renters are expected to choose their own hosts, and an attacker can attempt to manipulate the renter's selection criteria a number of ways, including by setting the price really low and by performing a Sybil attack. A Sybil attack is an attack where a single person (the attacker) pretends to be many. Online, a single person can fairly easily pretend to be 10 or even 10,000. In Sia, this means that an attacker might be able to spin up 10,000 machines each pretending to be an honest host, and then take advantage of renters.\n\nA key part of Sia's approach to stopping Sybil attackers is proof-of-burn. Hosts burn coins by sending them to a provably unspendable address. Hosts are expected to burn a portion of their revenue (~4%) as a demonstration that they are real. Renters will select hosts that have burned coins with a probability that grows in a linear relationship to the total number of coins burned. Therefore, a host that has burned 2x as many coins will be twice as likely to be selected as another host that has all other factors the same. This provides a very important defence against Sybil attacks. An attacker that is trying to manipulate a renter will need to have all of the excess redundancy of a file before being able to commit an attack. For a file with 3x redundancy, that means the attacker will need to get at least 2.1x of that redundancy, which means that the attacker will need to burn enough coins to look like 67% of the network. That entails burning 1.5x as many coins as the rest of the network has burned combined. Especially as the network grows and matures, collecting that many coins is going to be prohibitive. Unlike proof-of-stake systems, it's not sufficient to just collect those coins, they actually need to be burned, which means there's no chance of recovering that investment. While not wholly infeasible, performing a Sybil attack on Sia should be more expensive than performing a 51% attack on Bitcoin. Even better, paranoid renters can protect themselves more fully by using a higher redundancy. Renters storing at 10x redundancy are safe unless the attacker looks like 91% of the network, requiring the attacker to burn 9x as many coins as the rest of the network combined to be successful.\n\nWhile the exact algorithm for selection has not been finalized, most of the criteria is understood:\n\nHosts are given a score, and then selected randomly according to their score\nThe score goes up linearly with the number of coins burned - a linear relationship is required to prevent Sybil attacks\nHosts are heavily penalized if their uptime is below 95%, and there is not a significant advantage to having an uptime greater than 99%. That is because the trust model explicitly chooses to assume that no host is more reliable than 99% - while the historic reliability is there the chance of betrayal or malice is also always present. 99% reliability across a 20-of-30 scheme is far more than sufficient to guarantee overall file reliability.\nHosts are penalized exponentially for having a price that is higher than expected, but are not preferred exponentially for having a price that is lower than expected. 'Expected' is still undefined, but will likely be determined based on the real world cost of hard drives. Low prices cannot be preferred exponentially because this leaves room for Sybil attackers to get preference by setting the price too low. A host that is 2x the reasonable cost will have 1/32 the score, but a host that is 1/2 the reasonable cost will likely only have 2x the score.\nHost scores are increased linearly with the amount of collateral provided on the data, and a minimum amount of collateral is required. (to insulate against things like price volatility).\nHosts that demonstrate dishonesty are blacklisted.\nThe selection algorithm is not a part of any protocol, but is instead determined on a per-renter basis. This means that as our understanding of selection strategies improves, we can push out updates to renters that do not break compatibility with the rest of the network. It also means that renters with special needs (such as EU-only due to data regulations) or heightened paranoia are able to use different selection strategies without friction.",
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      "body": "Where can I vote?",
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    }
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  "op": [
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      "parent_author": "zubair20",
      "parent_permlink": "re-anthonyzhao-i-am-fresh-to-steemit-how-to-get-the-steem-20170624t063042051z",
      "author": "anthonyzhao",
      "permlink": "re-zubair20-re-anthonyzhao-i-am-fresh-to-steemit-how-to-get-the-steem-20170624t062914080z",
      "title": "",
      "body": "OK.\nBut I don't know how to vote for others?",
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      "permlink": "re-anthonyzhao-i-am-fresh-to-steemit-how-to-get-the-steem-20170624t063042051z",
      "title": "",
      "body": "yes you have to vote up , comments other people's post.\nThanks",
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      "permlink": "re-anthonyzhao-i-am-fresh-to-steemit-how-to-get-the-steem-20170624t062852164z",
      "title": "",
      "body": "get heard. follow me, upvote me, and i follow and upvote you back. =)",
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      "parent_permlink": "steem",
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      "permlink": "i-am-fresh-to-steemit-how-to-get-the-steem",
      "title": "I am fresh to steemit. How to get the steem?",
      "body": "Hello，everybody.\nI am fresh to steemit. \n\nHow to get the steem?\nWhere is the rule?",
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      "title": "",
      "body": "Albert Einstein",
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  "virtual_op": 0,
  "timestamp": "2017-06-12T03:56:39",
  "op": [
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  "virtual_op": 0,
  "timestamp": "2017-04-18T11:14:51",
  "op": [
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      "author": "anthonyzhao",
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  "timestamp": "2017-04-18T10:45:45",
  "op": [
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      "parent_permlink": "meet-the-animated-steembots",
      "author": "anthonyzhao",
      "permlink": "re-verelst-meet-the-animated-steembots-20170418t104543674z",
      "title": "",
      "body": "I want to learn more about it .",
      "json_metadata": "{\"tags\":[\"introduceyourself\"],\"app\":\"steemit/0.1\"}"
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  "timestamp": "2017-04-18T10:43:03",
  "op": [
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      "delegation": "220000.000000 VESTS",
      "creator": "steem",
      "new_account_name": "anthonyzhao",
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