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      "body": "Congratulations @sansteem! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@sansteem/birthday2.png</td><td>Happy Steem 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/@sansteem) and compare to others on the [Steem Ranking](https://steemitboard.com/ranking/index.php?name=sansteem)_</sub>\n\n\n**Do not miss the last post from @steemitboard:**\n<table><tr><td><a href=\"https://steemit.com/steemitboard/@steemitboard/downvote-challenge-add-up-to-3-funny-badges-to-your-board\"><img src=\"https://steemitimages.com/64x128/https://steemitimages.com/0x0/![](https://cdn.steemitimages.com/DQmUuJkZdnSpHVWssxF82ntymqXg4Pvk6K6bYvckUYVRsnj/image.png)\"></a></td><td><a href=\"https://steemit.com/steemitboard/@steemitboard/downvote-challenge-add-up-to-3-funny-badges-to-your-board\">Downvote challenge - Add up to 3 funny badges to your board</a></td></tr></table>\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": "## Smart Security?\n**Smart Security** represents a financial instrument with rights to an underlying asset, equity, cash flow or profit. Unlike traditional securities, **Smart Securities** take advantage of *automation, decentralization, liquidity and transparency* offered by the distributed ledger.\n\n![IMG_2741.jpg](https://cdn.steemitimages.com/DQmVSYK3b2KAPnDLyLJdWLuDLXBTC7wa9rFqXnhhHXKnYpc/IMG_2741.jpg)\n\n![IMG_2742.jpg](https://cdn.steemitimages.com/DQmbmA2WLZQe6ue6UvytbYgnPYGDqDcRdEqGi5NPVdAwVMR/IMG_2742.jpg)\n\n## Type of Smart Securities \n1. **Tokenized VC fund** - claim to a share of a fund. Each token is a unit that represents a fixed amount of investor rights. Tokens are tradable, and liquid.\n2. **Share-like tokens** - features such as ownership in an entity, voting rights, dividends, profit shares, or some interest in the success of a future entity. A subset of these are *'Revenue-Share'* tokens.\n3. **Asset-bakced tokens** - constitute an economic right to a real-world asset, such as art, real estate, power plants, etc.\n4. **Crypto-bonds** - debt tokens, can act as bonds, constituting a fixed claim on future streams of income.\n\n![IMG_2744.jpg](https://cdn.steemitimages.com/DQmfZJkGnA3rtSVqjp4N8owGRRFYgXQ3gt1QrpyhyPymdcQ/IMG_2744.jpg)\n\n## Benefits\n1. **Liquidity** - 24/7 global trading market\n2. **Transparency** - global pool of capital (as long as it's compliant) increases investment and reduces price arbitrage\n3. **Fair Pricing** - efficient trading creates less opportunities for arbitrage and spread taken by banks\n4. **Lower Fees** - smart contracts decrease fees paid to middlemen such as bankers, lawyers, accountants, etc.\n5. **Faster deal execution & settlement** - automated issuance and trade settlement on secondary markets\n6. **Democratization of investment** - global pool of capital\n7. **Decentralization** - removing concentration of power from banks and credit rating agencies\n8. **Smart design**\n\n![IMG_2745.jpg](https://cdn.steemitimages.com/DQmcGZrsa17ipVnUnXqTNe6FmEVS2pivw9DeH8f189Y5kHG/IMG_2745.jpg)\n\n![IMG_2746.jpg](https://cdn.steemitimages.com/DQmdSQCLh3aCzmJTD7JCQ3yvYazto1YXbVxmjBt3iogEYmh/IMG_2746.jpg)\n\n## 2019: The Year of Security Tokens\n\n1. **$1.6 trillion** private placement market **DISRUPTED**\n2. NASDAQ and other major exchanges adopt blockchain\n3. Democratization of Investment\n\n![IMG_2747.jpg](https://cdn.steemitimages.com/DQmbGEXzihd4wyUL15A8Gr4Ebpc6nWJZ7MLVAyWW5r5U6q4/IMG_2747.jpg)\n\nKeep up on Medium & Twitter for more information.\n@TatianaKoffman\nhttps://twitter.com/tatianakoffman\nhttps://medium.com/@tatianakoffman",
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      "body": "## Smart Security?\n**Smart Security** represents a financial instrument with rights to an underlying asset, equity, cash flow or profit. Unlike traditional securities, **Smart Securities** take advantage of *automation, decentralization, liquidity and transparency* offered by the distributed ledger.\n\n![IMG_2741.jpg](https://cdn.steemitimages.com/DQmVSYK3b2KAPnDLyLJdWLuDLXBTC7wa9rFqXnhhHXKnYpc/IMG_2741.jpg)\n\n![IMG_2742.jpg](https://cdn.steemitimages.com/DQmbmA2WLZQe6ue6UvytbYgnPYGDqDcRdEqGi5NPVdAwVMR/IMG_2742.jpg)\n\n## Type of Smart Securities \n1. **Tokenized VC fund** - claim to a share of a fund. Each token is a unit that represents a fixed amount of investor rights. Tokens are tradable, and liquid.\n2. **Share-like tokens** - features such as ownership in an entity, voting rights, dividends, profit shares, or some interest in the success of a future entity. A subset of these are *'Revenue-Share'* tokens.\n3. **Asset-bakced tokens** - constitute an economic right to a real-world asset, such as art, real estate, power plants, etc.\n4. **Crypto-bonds** - debt tokens, can act as bonds, constituting a fixed claim on future streams of income.\n\n![IMG_2744.jpg](https://cdn.steemitimages.com/DQmfZJkGnA3rtSVqjp4N8owGRRFYgXQ3gt1QrpyhyPymdcQ/IMG_2744.jpg)\n\n## Benefits\n1. **Liquidity** - 24/7 global trading market\n2. **Transparency** - global pool of capital (as long as it's compliant) increases investment and reduces price arbitrage\n3. **Fair Pricing** - efficient trading creates less opportunities for arbitrage and spread taken by banks\n4. **Lower Fees** - smart contracts decrease fees paid to middlemen such as bankers, lawyers, accountants, etc.\n5. **Faster deal execution & settlement** - automated issuance and trade settlement on secondary markets\n6. **Democratization of investment** - global pool of capital\n7. **Decentralization** - removing concentration of power from banks and credit rating agencies\n8. **Smart design**\n\n![IMG_2745.jpg](https://cdn.steemitimages.com/DQmcGZrsa17ipVnUnXqTNe6FmEVS2pivw9DeH8f189Y5kHG/IMG_2745.jpg)\n\n![IMG_2746.jpg](https://cdn.steemitimages.com/DQmdSQCLh3aCzmJTD7JCQ3yvYazto1YXbVxmjBt3iogEYmh/IMG_2746.jpg)\n\n## 2019: The Year of Security Tokens\n\n1. **$1.6 trillion** private placement market **DISRUPTED**\n2. NASDAQ and other major exchanges adopt blockchain\n3. Democratization of Investment\n\n![IMG_2747.jpg](https://cdn.steemitimages.com/DQmbGEXzihd4wyUL15A8Gr4Ebpc6nWJZ7MLVAyWW5r5U6q4/IMG_2747.jpg)\n\nKeep up on Medium & Twitter for more information.\n@TatianaKoffman\nhttps://twitter.com/tatianakoffman\nhttps://medium.com/@tatianakoffman",
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      "body": "Great post! I'm just wondering, may I use the image from the top of the page for a video presentation?",
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      "body": "Today's lesson was simple but powerful. \n\n# _\"Sometimes the only true answer is that we just do not know.\"_\n\nhttps://cdn.technologyreview.com/i/images/essay_x392.png?sw=1140&cx=0&cy=0&cw=392&ch=392\n\n> Even here, though, the scientific method is instructive, not for eliciting answers but rather for highlighting the limits of what can be known. We can’t help asking why Apple became so successful, or what caused the last financial crisis, or why “Gangnam Style” was the most viral video of all time. Nor can we stop ourselves from coming up with plausible answers. But in cases where we cannot test our hypothesis many times, the scientific method teaches us not to infer too much from any one outcome. Sometimes the only true answer is that we just do not know.\n\nhttps://www.technologyreview.com/s/523661/scientific-thinking-in-business/",
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      "permlink": "singularitynet-a-blockchain-based-open-market-for-interoperating-ais",
      "title": "SingularityNET - a blockchain-based open market for interoperating AIs",
      "body": "# SingularityNET?\nSingularityNET is an open and decentralized network of AI services made accessible through the blockchain. AI developers publish their services onto the SingularityNET network where they can be used by anyone with an internet connection. AI deveopers are able to charge for the use of their services using the native AGI token -- an ERC20 token hosted on Ethereum.\n\n# Key Objectives\n1. Transitioning from Narrow AI to Artificial General Intelligence (AGI)\n2. Providing business with Smarter, Broader, more Automated AI Services\n3. Ensuring AI is applied for the common good\n\n# SingularityNET and OpenCog\n\nSingularityNET loosely couples multiple AI algorithms, methods and solutions - enabling them to cooperate as a society and economy of minds.\n\nIt believes that __intelligence__ exists on the emergent level of the multi-agent network, as well as on the level of the individual AI agent in the network.\n\nThe OpenCog framework approaches AGI by tightly integrating multiple AI methods, enabling them all to use a common dynamic knowledge hypergraph. OpenCog instances, neural networks, and other types of AI agents co-exist and inter-operate within the SingularityNET decentralized cognitive compute fabric.\n\n![image.png](https://cdn.steemitimages.com/DQmReEm5HnchVnj9E1qf8xBinzNGu9daCxpxmM4LXukEKw3/image.png)\n\n# AGI and NarrowAI to GeneralAI\n* AGIs must learn from experience\n* An AI should assign meaning to all its idea, abstraction and hypotheses via extrapolation from its observations\n* An AGI must build its own model of itself and the world\n\n## Multiple narrow AI approaches can play a role in creating AGI\n* __Evolutionary Learning__: Genetic Programming, MOSES, CMA-ES, …\n* __Logic Systems__: Markov Logic Networks, PLN, theorem-provers, …\n* __Neural Networks__: deep and shallow hierarchical networks, heterarchical attractor neural networks (e.g., ECAN), …\n* __Stochastic Local Search__: SAT solvers, SMT, …\n* And plenty more ...\n\n## Narrow AI General AI\n\n|Narrow AI|\tGeneral AI|\n|-------------|---------------|\n|Trained or just Programmed|Educated|\n|Can only do one thing| Learn to do anything a human can learn and more|\n|(e.g., Deep Blue can’t drive a car; Google Car can’t play chess)\tCan (in principle)|-|\n|* Deep Blue  * AlphaGo * Facebook Face Recognizer * Google Self Driving Car * IBM Watson for Jeopardy * IBM Watson for Medical |__OpenCog__ and __SingularityNET__ are aimed here|\n\n# SingularityNET - The Decentralized AGI Mind-Cloud\n\n## SingularityNET Conceptual workflow\n![image.png](https://cdn.steemitimages.com/DQmTUZhTpuwgS5jXtJLHPms4nTsC1zrpCMKgPQ6BVR9smq1/image.png)\n\nAI nodes in the SingularityNET carry out diverse cognitive and analytic operations, and exchange diverse types of data.\nAI nodes may join together into \"federation\" - subnetworks of nodes that habitually work together to carry out particular sorts of tasks.\n\n_This is a \"network effect\" from both business and cognitive perspectives_\n\n# OpenCog applications\n- applying OpenCog to challenging practical problems, helps bridge the gap between here and AGI\n- The OpenCog AGI engine is already a core component underlying Sophia, SingularityNET's humanoid spokesperson, built by Hanson Robotics.\n![Screen Shot 2018-05-27 at 11.19.21 AM.jpg](https://cdn.steemitimages.com/DQmPtdAFNkCHAJPWEEykBPziotBUHuS1eE8p9ntzWWPx9My/Screen%20Shot%202018-05-27%20at%2011.19.21%20AM.jpg)\n- OpenCog powers the genomic and biomedical inference engine underlying Mozi AI Health, a cutting-edge decentralized cloud service providing advanced intelligence to the discovery of therapeutics and diagnostics and the control of systems biology simulations.\n![Screen Shot 2018-05-27 at 11.20.12 AM.jpg](https://cdn.steemitimages.com/DQmcqTcBYiMsuKkJKSZF8278gUQGbWvDqE4kry548pB8pRk/Screen%20Shot%202018-05-27%20at%2011.20.12%20AM.jpg)\n \n# AGI Alpha dApp\nThis Dapp allows you to browse the list of SingularityNET Agents from the SingularityNET Registry and call them to provide a Service. The Dapp uses the SingularityNET contracts deployed on the Kovan testnet.\n1. get test AGI token from AGI faucet at https://faucet.singularitynet.io (you need to login with GitHub account)\n![Screen Shot 2018-05-24 at 3.59.09 PM.jpg](https://cdn.steemitimages.com/DQmaPnWhoYkhRu8T2YT8CjXp5ispW84q96tLpdrYLDkFyMi/Screen%20Shot%202018-05-24%20at%203.59.09%20PM.jpg)\n2. provide address to get 1 token\n![Screen Shot 2018-05-24 at 4.29.31 PM.jpg](https://cdn.steemitimages.com/DQmYnGrxoAxnYajxFSMWF9zT11aU1U46yUVahYxCVRi9774/Screen%20Shot%202018-05-24%20at%204.29.31%20PM.jpg)\n3. a token is ready to develop dApp\n![Screen Shot 2018-05-24 at 4.32.26 PM.jpg](https://cdn.steemitimages.com/DQmXWms12rXYVVWU8BTiUnL3Vob94NJrLmEq1YZpWSygDF4/Screen%20Shot%202018-05-24%20at%204.32.26%20PM.jpg)\n4. open http://alpha.singularitynet.io/ \n![Screen Shot 2018-05-27 at 11.29.28 AM.jpg](https://cdn.steemitimages.com/DQmRvP1kUokRRBZ2rJnSbB6eL4m53W3cz6HSexaQEYYY8gK/Screen%20Shot%202018-05-27%20at%2011.29.28%20AM.jpg)\n5. Click the \"Create Job\" button to the right of the \"Alpha TensorFlow Agent\"\n![Screen Shot 2018-05-27 at 11.32.10 AM.jpg](https://cdn.steemitimages.com/DQmeAE4rXVXYLcG97omv8m3tj3dRxe1fL5pHU5q2d2Q5MjL/Screen%20Shot%202018-05-27%20at%2011.32.10%20AM.jpg)\n6. Click the \"Create Job Contract\" button at the bottom of the \"Job\" pane\n![Screen Shot 2018-05-27 at 11.51.10 AM.jpg](https://cdn.steemitimages.com/DQmcurusXUiFRZNbnzvecrBgfgp9J7fnRvgi9od2TJHxR2C/Screen%20Shot%202018-05-27%20at%2011.51.10%20AM.jpg)\n![Screen Shot 2018-05-27 at 11.51.34 AM.jpg](https://cdn.steemitimages.com/DQmdo7sMXjhwHwAMrXMwjisNBkKYjnyK9Qp1tFYA7kHeMoL/Screen%20Shot%202018-05-27%20at%2011.51.34%20AM.jpg)\n7. Click the \"SUBMIT\" button in the \"CONFIRM TRANSACTION\" dialogue (repeat until \"Call Agent API\" button appeared)\n![Screen Shot 2018-05-27 at 11.53.08 AM.jpg](https://cdn.steemitimages.com/DQmUf1QENhFPK9NDdbcT88iP4xVNGDaLTQfv5owFYexqABM/Screen%20Shot%202018-05-27%20at%2011.53.08%20AM.jpg)\n8. test API by uploading a file.\n![birthday.jpg](https://cdn.steemitimages.com/DQmYjqPHN53suPweebGDA6ECaXtzoQw9qZXuY5NJojKLjqe/birthday.jpg)\n![Screen Shot 2018-05-27 at 12.32.06 PM.jpg](https://cdn.steemitimages.com/DQmfVydT5pNxj6dJ3LEkWjAKppjFouwPsmVwkLx4gxZhu3h/Screen%20Shot%202018-05-27%20at%2012.32.06%20PM.jpg)\n\n# References\nhttps://github.com/singnet/wiki/wiki/Overview-%5BAlpha%5D\nhttps://github.com/singnet/alpha-dapp\nhttps://public.singularitynet.io/whitepaper.pdf",
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      "permlink": "decentralized-social-network-mastodon",
      "title": "Decentralized Social Network - Mastodon",
      "body": "# What is Mastodon?\n\nMastodon is a free, open-source social network server based on open web protocols like ActivityPub and OStatus. The social focus of the project is a viable decentralized alternative to commercial social media silos that returns the control of the content distribution channels to the people.\n\nIt's a federated social network begun in October 2016 by Eugen Rochko, a 24-year old German software engineer, as an alternative to Twitter.\n* Open-source software package;\n* Anyone with an internet-connected computer to set up an “instance”;\n* Mastodon is less like Facebook and more like email – you can have your own address;\n* Mastodon has to support “federation” to share contents between instances.\n\n![mastodon-map-1024x675.png](https://steemitimages.com/DQmev5iPe37FJgmVYW8z8s49mTqbVUNawY1T74ABxhxp6ba/mastodon-map-1024x675.png)\nMap of Mastodon instances from Mastodon Network Monitoring Project, August 17, 2017\n\n# Install and run Mastodon on Ubuntu Server 16.04\n\nAs it says above, you (anyone technically) can setup your own Mastodon instance and run. First step is install dependencies to make it work. (!!! You need to have a super user (root) privilege, you should know what you are doing!!!)\n\n* Install dependencies as a root user and libraries to run social __media__ and database __postgresql__\n```\n$ sudo su\n$ curl -sL https://deb.nodesource.com/setup_6.x | bash -\n$ curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -\n$ echo \"deb https://dl.yarnpkg.com/debian/ stable main\" | tee /etc/apt/sources.list.d/yarn.list\n$ apt update\n$ apt -y install imagemagick ffmpeg libpq-dev libxml2-dev libxslt1-dev file git-core g++ libprotobuf-dev protobuf-compiler pkg-config nodejs gcc autoconf bison build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm3 libgdbm-dev nginx redis-server redis-tools postgresql postgresql-contrib letsencrypt yarn libidn11-dev libicu-dev \n```\n\n* Install dependencies as a non-root user\n```\n$ adduser mastodon\n$ sudo su - mastodon // log in as the mastodon user \n```\n* Ruby is required to run Mastodon\n```\n$ git clone https://github.com/rbenv/rbenv.git ~/.rbenv\n$ cd ~/.rbenv && src/configure && make -C src\n$ echo 'export PATH=\"$HOME/.rbenv/bin:$PATH\"' >> ~/.bashrc\n$ echo 'eval \"$(rbenv init -)\"' >> ~/.bashrc\n```\n* Restart shell\n```\n$ exec bash\n```\n* Check if rbenv is correctly installed\n```\n$ type rbenv\n```\nYour Ruby environment:\n![Screen Shot 2018-05-19 at 11.23.01 AM.jpg](https://steemitimages.com/DQmdzcZkLPCQV68LGW5aZSMzxsFQS1BKiubCWZTsbBhjLrr/Screen%20Shot%202018-05-19%20at%2011.23.01%20AM.jpg)\n\n* Install ruby-build as rbenv plugin\n```\n$ git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build\n```\n* Enable ruby\n```\n$ rbenv install 2.5.0\n$ rbenv global 2.5.0\n```\n\n* node.js And Ruby Dependencies\n1) Return to mastodon user's home directory\n```$ cd ~```\n2) Clone the __Mastodon__ git repository into ~/live\n```$ git clone https://github.com/tootsuite/mastodon.git live```\n3) Change directory to ~/live\n```$ cd ~/live```\n4) Checkout to the latest stable branch\n```$ git checkout $(git tag -l | grep -v 'rc[0-9]*$' | sort -V | tail -n 1)```\n\n![Screen Shot 2018-05-19 at 11.59.22 AM.jpg](https://steemitimages.com/DQmeREVp4vC5PazWXmASwEMGnQWpw8gGUJRoY7iy4RVSHxv/Screen%20Shot%202018-05-19%20at%2011.59.22%20AM.jpg)\n\n* Install bundler\n``$ gem install bundler```\n* Use bundler to install the rest of the Ruby dependencies\n```$ bundle install -j$(getconf _NPROCESSORS_ONLN) --deployment --without development test```\n* Use yarn to install node.js dependencies\n```$ yarn install --pure-lockfile```\n\n```$ exit```  // -> back to root\n\n## PostgreSQL database setup for contents\n\nCreate a user for a PostgreSQL instance:\n1) Launch psql as the postgres user\n```$ sudo -u postgres psql```\n2) In the following prompt\n```\nCREATE USER mastodon CREATEDB;\n\\q\n```\n\n![Screen Shot 2018-05-19 at 12.22.37 PM.jpg](https://steemitimages.com/DQmcQYZeKn74xPf8yo2GM1NXVWGH9F1rS84H3N8kadYzxPz/Screen%20Shot%202018-05-19%20at%2012.22.37%20PM.jpg)\n\n* nginx web server Configuration\n\n1) edit configuration file to fit your environment: ex. for domain ```isaif.space``` (it would be our Mastodon instance)\n```$ cd /etc/nginx/sites-available```\n2) create a file name ```isaif.space.conf```\n3) add following configuration \n```\nmap $http_upgrade $connection_upgrade {\n  default upgrade;\n  ''      close;\n}\n\nserver {\n  listen 80;\n  listen [::]:80;\n  server_name isaif.space;\n  root /home/mastodon/live/public;\n  # Useful for Let's Encrypt\n  location /.well-known/acme-challenge/ { allow all; }\n  location / { return 301 https://$host$request_uri; }\n}\n\nserver {\n  listen 443 ssl http2;\n  listen [::]:443 ssl http2;\n  server_name isaif.space;\n\n  ssl_protocols TLSv1.2;\n  ssl_ciphers HIGH:!MEDIUM:!LOW:!aNULL:!NULL:!SHA;\n  ssl_prefer_server_ciphers on;\n  ssl_session_cache shared:SSL:10m;\n\n  ssl_certificate     /etc/letsencrypt/live/isaif.space/fullchain.pem;\n  ssl_certificate_key /etc/letsencrypt/live/isaif.space/privkey.pem;\n\n  keepalive_timeout    70;\n  sendfile             on;\n  client_max_body_size 8m;\n\n  root /home/mastodon/live/public;\n\n  gzip on;\n  gzip_disable \"msie6\";\n  gzip_vary on;\n  gzip_proxied any;\n  gzip_comp_level 6;\n  gzip_buffers 16 8k;\n  gzip_http_version 1.1;\n  gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;\n\n  add_header Strict-Transport-Security \"max-age=31536000\";\n\n  location / {\n    try_files $uri @proxy;\n  }\n\n  location ~ ^/(emoji|packs|system/accounts/avatars|system/media_attachments/files) {\n    add_header Cache-Control \"public, max-age=31536000, immutable\";\n    try_files $uri @proxy;\n  }\n  \n  location /sw.js {\n    add_header Cache-Control \"public, max-age=0\";\n    try_files $uri @proxy;\n  }\n\n  location @proxy {\n    proxy_set_header Host $host;\n    proxy_set_header X-Real-IP $remote_addr;\n    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;\n    proxy_set_header X-Forwarded-Proto https;\n    proxy_set_header Proxy \"\";\n    proxy_pass_header Server;\n\n    proxy_pass http://127.0.0.1:3000;\n    proxy_buffering off;\n    proxy_redirect off;\n    proxy_http_version 1.1;\n    proxy_set_header Upgrade $http_upgrade;\n    proxy_set_header Connection $connection_upgrade;\n\n    tcp_nodelay on;\n  }\n\n  location /api/v1/streaming {\n    proxy_set_header Host $host;\n    proxy_set_header X-Real-IP $remote_addr;\n    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;\n    proxy_set_header X-Forwarded-Proto https;\n    proxy_set_header Proxy \"\";\n\n    proxy_pass http://127.0.0.1:4000;\n    proxy_buffering off;\n    proxy_redirect off;\n    proxy_http_version 1.1;\n    proxy_set_header Upgrade $http_upgrade;\n    proxy_set_header Connection $connection_upgrade;\n\n    tcp_nodelay on;\n  }\n\n  error_page 500 501 502 503 504 /500.html;\n}\n```\n* Activate the configuration\n```\n$ cd /etc/nginx/sites-enabled\n$ ln -s ../sites-available/isaif.space.conf\n```\n\n## Make it secure by SSL encryption\n\n* configure Let’s Encrypt (free SSL)\n```\n# systemctl stop nginx // stop nginx service first\n# letsencrypt certonly --standalone -d isaif.space\n```\n\n![Screen Shot 2018-05-19 at 1.13.46 PM.jpg](https://steemitimages.com/DQmfCT4NGVUpWFCZfcVmBHAGkJiD8mTiwGSBAtzF2HHK1nr/Screen%20Shot%202018-05-19%20at%201.13.46%20PM.jpg)\n\n![Screen Shot 2018-05-19 at 5.02.01 PM.jpg](https://steemitimages.com/DQmZMJrSQnz7Y5nuw3fK7bSF1MWpXztQrdbqgQHgH59XjgZ/Screen%20Shot%202018-05-19%20at%205.02.01%20PM.jpg)\n\n* restart nginx server\n```# systemctl start nginx```\n* The letsencrypt tool will ask if you want issue a new cert, please choose that option\n```$ letsencrypt certonly --webroot -d isaif.space -w /home/mastodon/live/public/```\n![Screen Shot 2018-05-19 at 5.12.46 PM.jpg](https://steemitimages.com/DQmY4m8ZtebfZMeBF61imn8GQWJ2nkxCJVXjAKpBzs2u5d7/Screen%20Shot%202018-05-19%20at%205.12.46%20PM.jpg)\n\nNow you have working nginx web server, open isaif.space with a browser:\n![Screen Shot 2018-05-19 at 5.14.03 PM.jpg](https://steemitimages.com/DQmP7JP8xitxwYJaGQgYNpCpYCqpFjJ6XRfVv1JdFLDxXhs/Screen%20Shot%202018-05-19%20at%205.14.03%20PM.jpg)\n\n## Mastodon Application Configuration\n\nNow, you need to activate Mastodon instance, setup as mastodon user:\n```\n$ sudo su - mastodon\n$ cd ~/live\n```\n* Run Mastodon setup wizard:\n\n```RAILS_ENV=production bundle exec rake mastodon:setup```\n\n![Screen Shot 2018-05-19 at 5.23.25 PM.jpg](https://steemitimages.com/DQmRBuuZzXi8bJXKr7CpHoXgxXhAQWLbmWaGR53onpfNPes/Screen%20Shot%202018-05-19%20at%205.23.25%20PM.jpg)\n...\n![Screen Shot 2018-05-19 at 5.26.27 PM.jpg](https://steemitimages.com/DQmRW4BiommGQcbQnPEgsP9Y29vJ4mTR4U5EgPoeRu69Mev/Screen%20Shot%202018-05-19%20at%205.26.27%20PM.jpg)\n\n_It takes a while..._\n\n\nAll done! You can now power on the Mastodon server 🐘\n\nDo you want to create an admin user straight away? Yes\nDefault type scope order, limit and offset are ignored and will be nullified\nCreating scope :cache_ids. Overwriting existing method Notification.cache_ids.\nUsername: admin\nE-mail: [email protected]~~\nYou can login with the password: ~~d18443179170cdc1243d61f303a0eaec~~\nYou can change your password once you login.\n\nFinally, you can access your live Mastodon instance by opening https://isaif.space \n![Screen Shot 2018-05-19 at 9.22.06 PM.jpg](https://steemitimages.com/DQmPoXkn1tVBPBq3uNjLUtETjWAveE5F24MCVk43fSvc43u/Screen%20Shot%202018-05-19%20at%209.22.06%20PM.jpg)\n\nYou can configure your instance more.\n\n## Problem of federation and possible solutions using blockchain\n\nUsers still need to be somewhat trustful of their instance administrator. These admins have the ability to delete content and accounts on the local server, and it’s also possible that the entire federation of instances will eventually centralize around a few key servers that make the system look more similar to how Twitter works today. The specific scenario where a user wants to move to another instance without losing all of their followers is where Bitcoin’s blockchain may be helpful. \n\nBy mapping Mastodon addresses to blockchain-based identity systems, a bit more power can be removed from instance administrators. Integration with Keybase or Onename may also remove some of the confusion users have had with Mastodon addresses in the first place. \n\nOf course, it’s still unclear how necessary the use of a blockchain will turn out to be in these sorts of digital identity systems. It’s possible that a trusted third party, such as the Electronic Frontier Foundation, could provide this sort of service for free on a centralized server. There’s also early Bitcoin developer Martti Malmi’s Identifi, which stores public data on the IPFS network.\n\nAnd there is a blockchain-powered social media networking startup called Hiveway platform to address above issues based on Mastodon. It looks like to have a promising but still doesn't prove it's possibility and idea yet.\n\n\n### References\n\nhttps://github.com/tootsuite/documentation/blob/master/Running-Mastodon/Production-guide.md\nhttp://www.ethanzuckerman.com/blog/2017/08/18/mastodon-is-big-in-japan-the-reason-why-is-uncomfortable/\nhttps://medium.com/tootsuite/how-to-start-a-mastodon-server-dea0dec56028\nhttps://github.com/tootsuite/documentation/blob/master/Using-Mastodon/User-guide.md#decentralization-and-federation\nhttps://cryptoinsider.21mil.com/blockchain-may-solve-key-issue-mastodon-new-federated-twitter-alternative/\nhttps://medium.com/we-distribute/hiveway-io-shamelessly-rips-off-of-mastodon-and-slaps-a-blockchain-on-top-for-some-reason-57b7aba3e84f",
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      "body": "감사합니다. 다음에 더 좋은 주제를 준비해보겠습니다.",
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      "author": "sansteem",
      "permlink": "re-hslife-deblock-dapp-business-3-key-pillars-20180506t114500646z",
      "title": "",
      "body": "많은 생각과 경험이 담긴 글입니다. 감사합니다.",
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      "permlink": "re-sansteem-re-gardenpark-lean-startup-and-lean-canvas-20180506t113909656z",
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      "body": "아이고..너무 과한 칭찬이십니다..저는 도전을 멈추었지만 아직 스타트업의 꿈을 버리지는 않았습니다. @sansteem님의 도전을 응원하고 싶습니다. 자주 찾아 뵙고 근황을 살피겠습니다. 부족한 글을 의미있게 읽어 주셔서 너무 힘이 납니다. 감사합니다 ^^",
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      "body": "현재 스타트업을 하고 있습니다. MBA 강의에서 듣던 내용에 필적하네요! 감사합니다.",
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      "body": "@@ -7502,16 +7502,995 @@\n , etc.%0A%0A\n+DAGs have no mining, no blocks and no transaction fees. The security and consensus of the network is not divided among miners, validators, and users. Users of the network validate a number of old transactions (via proof of work) in order to be able to conduct one of their own. No one receives a reward and no one has to pay transaction fees. It also eliminates the need for a miner-centralization like in Bitcoins or in Ethereums network. All users of a given DAG-based ledger confirm transactions for one another rather than rely on outside %E2%80%9Cminers.%E2%80%9D Hashgraph%E2%80%99s ledger doesn%E2%80%99t bundle transactions, while Bitcoin blockchain requires them to be packaged in 1 megabyte blocks, which, during days of heavy traffic, can take days of work by miners to confirm and record.%0A%0AIn spite of its promising future, it is way too early to say that hashgraph will replace blockchain and hashgraph is patented and not open source like blockchain. That's why not everyone is using DAGs for now.\n %0A%0A### Im\n",
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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://hackernoon.com/a-hitchhikers-guide-to-consensus-algorithms-d81aae3eb0e3",
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      "title": "Consensus Algorithms in Blockchains",
      "body": "# Consensus Algorithms in Blockchains\n\n## Problems?\n\n![image.png](https://steemitimages.com/DQmZ9aw8uU7x3xGYfAuLqrqhKukQ1cNV2ZEjBfnNbmpKBpd/image.png)\n\nAn overarching problem that cryptocurrencies must address is called the Byzantine General's Problem. The problem is that several Byzantine generals and their respective portions of the Byzantine army and have surrounded a city. They must decide in unison whether or not to attack. If some generals attack without the others, their siege will end in tragedy. The generals are usually separated by distance and have to pass messages to communicate. \n\nThe Byzantine General's Problem essentially simplifies down to: How do you prevent data from being corrupted or falsified in a network where there are nodes that have economic incentive to lie about the data?\n\n## Solutions\n\n### 1. Proof of Work (PoW)\n\n![image.png](https://steemitimages.com/DQmNNHpvoFatuuW1GmbSxMcCqfzPhB1ceHG14rHUunisgW7/image.png)\n\nProof of Work was the first blockchain consensus algorithm. Devised by Satoshi Nakamoto for use in the Bitcoin blockchain, we have PoW to thank for the massive mining operations and power consumption we see around the world.\nPoW operates on the principle that it is expensive to add a tranche of new transactions to the blockchain, but very easy to check if the transactions are valid due to the transparent nature of the ledger. Miners collectively verify the entire blockchain, and transactions aren’t considered to be fully ‘confirmed’ until several new blocks have been added on top of them. \n\n\n\n> Bitcoin uses the SHA-256 Algorithm, which is one of many hashing programs that can hash like that.\n> For example, the SHA-256 hash of the word \"apple\" is \n> `3a7bd3e2360a3d29eea436fcfb7e44c735d117c42d1c1835420b6b9942dd4f1b`\n> yet the SHA-256 hash of \"applf\" (incrementing the 'e' to an 'f') is\n> `75721aa556fe5e5c8dddd399a7ede960b73b619e96b0db1d7b7482ba3b74fd6f`\n> These strings look super different, and that's intended—there's no quick or easy way to go from the first to the second.\n\n\n\nIf a malicious actor tries to spend coins fraudulently, those transactions will be ignored by the rest of the network. The only way that an attacker could commit such a fraud is to possess a huge amount of computational power, such that they could mine block after block, winning the proof of work competition time after time. This is known as a ‘51% attack’ due to the need to possess more than half of total network hashrate. The reality is that no miner has such a proportion of total hashing power. Thus attempting such a fraud is 1) extremely expensive (since it costs as much as the hardware and energy required, plus the opportunity cost of not supporting the valid version of the blockchain and receiving rewards in return) and 2) extremely unlikely to succeed. Consequently it is better (i.e. more profitable) for miners to remain honest.\n\n\n### 2. Proof of Stake (PoS)\n\n![image.png](https://steemitimages.com/DQmQqzKZiEvPvd1Wc7zoKt7gygjLrfEf1HakWX7g51NoVP4/image.png)\n\nProof of Stake (PoS) is similar to PoW except for the fact that participants \"stake\" their holdings in order to get a chance to mine a block. In PoS, participants still require computational power to participate, but the computational power is much less. Instead of using it to solve mathematical problems, participants only need to use computational power to prove how much they have at stake and a well designed random number generator will choose the winning participant.\n\n![image.png](https://steemitimages.com/DQmRttY9He3chu4Qm4SMp92o6ncDtEwS57RPazrqeWZmq3S/image.png)\n\nThe common argument against proof-of-stake is the Nothing at Stake problem. The concern is that since it costs validators almost no computational power to support a fork unlike PoW, validators could vote for both sides of every fork that happens. Forks in PoS could then be much more common than in PoW, which some people worry could harm the credibility of the currency.\n\nSome people, like Ethereum supporters, think Proof of Stake is more efficient and fair compared to Proof of Work for reasons such as the above. Additionally, anyone could become a PoS miner technically given they had some amount of the coin, however getting into Bitcoin mining generally requires expensive hardware and commitment.\n\n### 3. Delegated Proof of Stake (DPoS)\n\n![image.png](https://steemitimages.com/DQmVr4TBVMg1xhXQPmRvfojc9FKfDSm8R1wpL4GRX8Hc4YM/image.png)\n\nDelegated Proof of Stake (DPoS) is the fastest, most efficient, most decentralized, and most flexible consensus model available. DPoS leverages the power of stakeholder approval voting to resolve consensus issues in a fair and democratic way. All network parameters, from fee schedules to block intervals and transaction sizes, can be tuned via elected delegates. Deterministic selection of block producers allows transactions to be confirmed in an average of just 1 second. Perhaps most importantly, the consensus protocol is designed to protect all participants against unwanted regulatory interference.\nDPoS is the brain-child of Daniel Larimer, and is actually very different from PoS. In DPoS, token hodlers don’t vote on the validity of the blocks themselves, but vote to elect delegates to do the validation on their behalf. There are generally between 21–100 elected delegates in a DPoS system. The delegates are shuffled periodically and given an order to deliver their blocks in. Having few delegates allows them to organize themselves efficiently and create designated time slots for each delegate to publish their block. If delegates continually miss their blocks or publish invalid transactions, the stakers vote them out and replace them with a better delegate.\n\nIn DPoS, miners can collaborate to make blocks instead of competing like in PoW and PoS. By partially centralizing the creation of blocks, DPoS is able to run orders of magnitude faster than most other consensus algorithms.\n\n### 4. Byzantine Fault Tolerance\n\n![image.png](https://steemitimages.com/DQmSZCCWTTEyi5Js7WGSbN34yUkHP2HNEgS2Z3TSwqyD4pp/image.png)\n\nPractical Byzantine Fault Tolerance (PBFT): One of the first solutions to this problem was coined Practical Byzantine Fault Tolerance. Currently in use by Hyperledger Fabric, with few (< 20, after that things get a little ) pre-selected generals PBFT runs incredibly efficiently. Pros: High transaction throughput Cons: Centralized/permissioned\n\nFederated Byzantine Agreement (FBA): FBA is another class of solutions to the Byzantine generals problem used by currencies like Stellar and Ripple. The general idea (heh), is that every Byzantine general, responsible for their own chain, sorts messages as they come in to establish truth. In Ripple the generals (validators) are pre-selected by the Ripple foundation. In Stellar, anyone can be a validator so you choose which validators to trust.\n\nFor its incredible throughput, low transaction cost, and network scalability, I believe the FBA class of consensus algorithms are the best we’ve discovered for distributed consensus.\n\n\n### 5. Directed Acylic Graphs (DAGs)\n\n![image.png](https://steemitimages.com/DQmQxLTVba1h5cSSRdgzSCzpccGK4EJkww5i85qGAchWBY8/image.png)\n\nDAGs are a form of consensus that doesn’t use the blockchain data structure and handles transactions mostly asynchronously. The big pro is theoretically infinite transactions per second, but DAGs have strengths and weaknesses like any other consensus.\n\n* Examples: Tangle, Hashgraph, Block-lattice, SPECTRE, etc.\n\n\n\n### Implementations, pros and cons of consensus algorithms\n\n  Name  | Proof of Work | Proof of Stake  | Delegated Proof of Stake | Byzantine Fault Tolerance | Directed Acylic graphs\n- | -  | - | - | - | -\nPopular Examples | Bitcoin, Ethereum, Litecoin, Dogecoin, (Most of them) | Decred, Ethereum (soon), Peercoin | Steemit, EOS, BitShares | Hyperledger, Stellar, Dispatch, Ripple |  Iota, Hashgraph, Raiblocks/Nano\nPros | Most well known | Attacks more expensive; More decentralized; Energy efficient | Cheap transactions; scalable; energy efficient | High throughput; low cost; scalable | Network Scalability; low cost\nCons | Slow throughput; killing the planet | Nothing at Stake | Partially centralized | Semi-trusted | Depends on implementation\n\n### References\n\nhttps://hackernoon.com/a-hitchhikers-guide-to-consensus-algorithms-d81aae3eb0e3\nhttps://steemit.com/bitcoin/@mooncryption/guide-proof-of-work-pow-vs-proof-of-stake-pos-vs-delegated-proof-of-stake-dpos\nhttps://blockgeeks.com/guides/proof-of-work-vs-proof-of-stake/\nhttps://seekingalpha.com/article/4132934-ethereums-casper-protocol-will-address-problems-proof-stake\nhttps://bitshares.org/technology/delegated-proof-of-stake-consensus/\nhttps://medium.com/@DebrajG/how-the-byzantine-general-sacked-the-castle-a-look-into-blockchain-370fe637502c\nhttps://techstartups.com/2018/03/14/future-of-blockchain-will-hashgraph-make-blockchain-obsolete/",
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      "body": "# Many Chains, Many Coins, One Ecosystem\n\n![image.png](https://steemitimages.com/DQmZShsCfxKX4zy5piF21GrKk3Q2B7suCfvDSMmhr4Egmvq/image.png)\n\n* __Cosmos__ - Internet of Blockchains\n* __CosmosHub__ - Internet Service Provider (ISP)\n* __Tendermint__ - Blockchain Consensus \n* __ABCI__ - TCP/IP\n\n## Simplified Architecture of blockchain including Bitcoin\n![image.png](https://steemitimages.com/DQmUhaNbuv9a9BDiFMDXwS1Ked5gbdwvnJXPto5aRVmE3bt/image.png)\n\n* The __network protocol__ is how nodes in the network tell each other about new transactions, blocks, and other nodes; usually a p2p gossip network.\n* The __consensus protocol__ is the set of rules that nodes should follow to determine which particular ordered set of transformations should be in the ledger at a given moment. In Bitcoin, the chain with the highest difficulty seen by a node is treated as authoritatively correct.\n* The __transaction protocol__ describes what makes transactions valid, and how they should mutate the blockchain's state.\n\n## Extended Architecture - __Ethereum__\n![image.png](https://steemitimages.com/DQmSiNsMyndfMXojVSpbizRDKVv3KNNe4PvGqTdFqXvjQxC/image.png)\n* Focus only on Application (EVM) as a state machine\n* Not able to change any deeper level of stacks\n* Poor performance - scalability issue\n\n## Can Tendermint Core resolve those issues?\n![image.png](https://steemitimages.com/DQmeZ2YFyXBgLrgCvAixiuV7SW8tQyy7tYKD1LLFGPxs8b1/image.png) \n\n* Proof of Stake (__PoS__) BFT Consensus algorithm is faster (1-3 sec) than Bitcoin’s synchronous consensus (>10 mins)\n* Interoperable for both Public & Private Chains\n* Instant Finality\n* Highly Scalable\n* Guarantees safety in asynchronous & liveness in weakly synchronous environments\n* Basis for other PoW systems like Casper\n\n## Cosmos Ecosystem\n![image.png](https://steemitimages.com/DQmdS1ajKSmzKr4nUZihh6pmgJBjiEnB2qAP68zkat4koiV/image.png)\n\n## OK, now what?\n_Let’s build something on this cool ecosystem._\n\n### Lotion\nLotion is a new way to create blockchain apps in JavaScript, which aims to make writing new blockchains fast and fun. It builds on top of Tendermint using the ABCI protocol. Lotion lets you write secure, scalable applications that can easily interoperate with other blockchains on the Cosmos Network using IBC.\n\nGithub `https://github.com/keppel/lotion`\n\nWhen you're writing a Lotion app, you're only responsible for writing the transaction protocol. Under the hood, Tendermint is handling the consensus and network protocols. When you start your lotion app, a Tendermint node is also started which will handle all of the communication with other nodes running your lotion app.\n\n1. `$ npm install lotion`\n2. Create a javascript file called `my-lotion-app.js` and run it by\n3. $ node my-lotion-app.js\n\ncode for `my-lotion-app.js`\n\n```\nlet app = require('lotion')({\n  initialState: { count: 0 }\n})\n\napp.use((state, tx) => {\n  state.count++\n})\n\napp.listen(3000)\n```\n\n## How to test it? By using `curl`\n\n`$ curl http://localhost:3000/state`\n> {\"count\":0}\n\n`$ curl http://localhost:3000/txs -d '{}'`\n> {\"result\":{\"check_tx\":{\"code\":0,\"data\":\"\",\"log\":\"\",\"gas\":\"0\",\"fee\":\"0\"},\"deliver_tx\":{\"code\":0,\"data\":\"\",\"log\":\"\",\"tags\":[]},\"hash\":\"60A4191756CDAE902D6DF6341F0E31458DB856BB\",\"height\":105}} \n\n`$ curl http://localhost:3000/state`\n> {\"count\":1}\n\nYou can make a working blockchain app with javascript and really easy!\n\n\n## For more information about Cosmos:\nhttps://www.youtube.com/watch?v=LApEkXJR_0M",
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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://lotionjs.com/",
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      "title": "Building dApp on Cosmos SDK, Tendermint",
      "body": "# Many Chains, Many Coins, One Ecosystem\n\n![image.png](https://steemitimages.com/DQmZShsCfxKX4zy5piF21GrKk3Q2B7suCfvDSMmhr4Egmvq/image.png)\n\n* __Cosmos__ - Internet of Blockchains\n* __CosmosHub__ - Internet Service Provider (ISP)\n* __Tendermint__ - Blockchain Consensus \n* __ABCI__ - TCP/IP\n\n## Simplified Architecture of blockchain including Bitcoin\n![image.png](https://steemitimages.com/DQmUhaNbuv9a9BDiFMDXwS1Ked5gbdwvnJXPto5aRVmE3bt/image.png)\n\n* The __network protocol__ is how nodes in the network tell each other about new transactions, blocks, and other nodes; usually a p2p gossip network.\n* The __consensus protocol__ is the set of rules that nodes should follow to determine which particular ordered set of transformations should be in the ledger at a given moment. In Bitcoin, the chain with the highest difficulty seen by a node is treated as authoritatively correct.\n* The __transaction protocol__ describes what makes transactions valid, and how they should mutate the blockchain's state.\n\n## Extended Architecture - __Ethereum__\n![image.png](https://steemitimages.com/DQmSiNsMyndfMXojVSpbizRDKVv3KNNe4PvGqTdFqXvjQxC/image.png)\n* Focus only on Application (EVM) as a state machine\n* Not able to change any deeper level of stacks\n* Poor performance - scalability issue\n\n## Can Tendermint Core resolve those issues?\n![image.png](https://steemitimages.com/DQmeZ2YFyXBgLrgCvAixiuV7SW8tQyy7tYKD1LLFGPxs8b1/image.png) \n\n* Proof of Stake (__PoS__) BFT Consensus algorithm is faster (1-3 sec) than Bitcoin’s synchronous consensus (>10 mins)\n* Interoperable for both Public & Private Chains\n* Instant Finality\n* Highly Scalable\n* Guarantees safety in asynchronous & liveness in weakly synchronous environments\n* Basis for other PoW systems like Casper\n\n## Cosmos Ecosystem\n![image.png](https://steemitimages.com/DQmdS1ajKSmzKr4nUZihh6pmgJBjiEnB2qAP68zkat4koiV/image.png)\n\n## OK, now what?\n_Let’s build something on this cool ecosystem._\n\n### Lotion\nLotion is a new way to create blockchain apps in JavaScript, which aims to make writing new blockchains fast and fun. It builds on top of Tendermint using the ABCI protocol. Lotion lets you write secure, scalable applications that can easily interoperate with other blockchains on the Cosmos Network using IBC.\n\nGithub `https://github.com/keppel/lotion`\n\nWhen you're writing a Lotion app, you're only responsible for writing the transaction protocol. Under the hood, Tendermint is handling the consensus and network protocols. When you start your lotion app, a Tendermint node is also started which will handle all of the communication with other nodes running your lotion app.\n\n1. `$ npm install lotion`\n2. Create a javascript file called `my-lotion-app.js` and run it by\n3. $ node my-lotion-app.js\n\ncode for `my-lotion-app.js`\n\n```\nlet app = require('lotion')({\n  initialState: { count: 0 }\n})\n\napp.use((state, tx) => {\n  state.count++\n})\n\napp.listen(3000)\n```\n\n## How to test it? By using `curl`\n\n`$ curl http://localhost:3000/state`\n> {\"count\":0}\n\n`$ curl http://localhost:3000/txs -d '{}'`\n> {\"result\":{\"check_tx\":{\"code\":0,\"data\":\"\",\"log\":\"\",\"gas\":\"0\",\"fee\":\"0\"},\"deliver_tx\":{\"code\":0,\"data\":\"\",\"log\":\"\",\"tags\":[]},\"hash\":\"60A4191756CDAE902D6DF6341F0E31458DB856BB\",\"height\":105}} \n\n`$ curl http://localhost:3000/state`\n> {\"count\":1}\n\nYou can make a working blockchain app with javascript and really easy!\n\n\n## For more information about Cosmos:\nhttps://www.youtube.com/watch?v=LApEkXJR_0M",
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      "permlink": "re-sansteem-re-hiconcep-distributed-consensus-basic-20180425t144833479z",
      "title": "",
      "body": "감사합니다. 기본에 충실한 강의시리즈를 만들어 보려고 합니다. 너무 피상적인 것들만 많아서요 ...",
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      "body": "매우 전문적이고 유익한 강의입니다. 😊",
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