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      "author": "steemitboard",
      "permlink": "steemitboard-notify-rtrade-20190524t003230000z",
      "title": "",
      "body": "Congratulations @rtrade! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@rtrade/birthday1.png</td><td>Happy Birthday! - You are on the Steem blockchain for 1 year!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@rtrade) and compare to others on the [Steem Ranking](http://steemitboard.com/ranking/index.php?name=rtrade)_</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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      "author": "steemitboard",
      "permlink": "steemitboard-notify-rtrade-20190511t081150000z",
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      "body": "Congratulations @rtrade! You have completed the following achievement on the Steem blockchain and have been rewarded with new badge(s) :\n\n<table><tr><td><img src=\"https://steemitimages.com/60x70/http://steemitboard.com/@rtrade/posts.png?201905110719\"></td><td>You published more than 20 posts. Your next target is to reach 30 posts.</td></tr>\n</table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@rtrade) and compare to others on the [Steem Ranking](http://steemitboard.com/ranking/index.php?name=rtrade)_</sub>\n<sub>_If you no longer want to receive notifications, reply to this comment with the word_ `STOP`</sub>\n\n\nTo support your work, I also upvoted your post!\n\n\n**Do not miss the last post from @steemitboard:**\n<table><tr><td><a href=\"https://steemit.com/steemitboard/@steemitboard/steemitboard-witness-update-2019-05\"><img src=\"https://steemitimages.com/64x128/http://i.cubeupload.com/7CiQEO.png\"></a></td><td><a href=\"https://steemit.com/steemitboard/@steemitboard/steemitboard-witness-update-2019-05\">SteemitBoard - Witness Update</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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      "parent_permlink": "cryptocurrency",
      "author": "rtrade",
      "permlink": "run-your-own-ipfs-search-engine-with-lens",
      "title": "Run Your Own IPFS Search Engine With Lens",
      "body": "# Run Your Own IPFS Search Engine With Lens\n\n\n\n[Lens](https://github.com/RTradeLtd/Lens) is another one of our open-source IPFS tools under the Temporal umbrella, allowing you to take content from IPFS, and index it to be searchable at a later date. Currently Lens can index the following mime-types:\n\n* text/*\n\n* image/*\n\n* application/pdf\n\nThe one requirement is that all your data exists on IPFS, and is discoverable by the running Lens instance. In the future we may add support for other distributed networks, such as DAT or SWARM. To interact with Lens we have a simple, but robust gRPC API that supports both simple and complex queries.\n\n## How Does Indexing Work\n\nWe have a few different methods of analyzing data that we’ll chain together. When given PDFs we first attempt to extract images and text from the pages. The text is fed into bleve which is capable of handling simple and complex search queries. The images are also analyzed, using a combination of Tesseract for optical character recognition to extract searchable text, and Tensorflow for rudimentary classification of images. When analyzing other mime types such as image/* we attempt to perform the same Tesseract, and image classification analysis as we do with images extracted from PDFs. When analyzing mime types like text/* we feed the text directly into bleve.\n\n## How Does Searching Work\n\nSearching at the most basic level consists of taking a query, ranging from single words like blockchain all the way up to search phrases like blockchain data storage. We also support more complex queries, like filtering against specific tags, categories, mime types, and more however these are entirely optional.\n\nThe response to your query is an array of documents that contains the IPFS hash of the content that matched your query, as well as the mimetype of the content, and a score displaying the relevance this content has to your search query.\n\n![](https://cdn-images-1.medium.com/max/2000/1*7gnii4YYVJ_eloYkU27Y6g.jpeg)\n\n## Installing Lens\n\nThere are a few different ways you can go about installing Lens, with the simplest way to be using our prebuilt Lens docker image. When using the docker image, the default setting is to start the gRPC server listening on 0.0.0.0:9998, without any encryption, and with a gRPC authentication key of blahblahblah. The docker container will also need a connection to an IPFS HTTP API, with the default being 127.0.0.1:5001. To install this docker image, run the following command docker pull rtradetech/lens:latest\n\nAlternatively for those wanting a more hands off setup, we have a docker-compose setup that also spins up the required IPFS node. To use this docker-compose file, the following set of commands need to be run. These will use the /tmp directory as the base directory for storing all files in.\n\n    $> wget -O lens.yml https://raw.githubusercontent.com/RTradeLtd/Lens/master/lens.yml\n    $> LENS=latest BASE=/tmp docker-compose -f lens.yml up\n\n## Using Lens\n\nBefore we get started with how you can use Lens, we’ve published the existing Lens index as seen on [https://temporal.cloud/lens](https://temporal.cloud/lens) via IPFS that can be downloaded via the CID [QmZqSYDQrtWg4LHnqT6DPqa1XUr7u4oeaGcyaTiGHJY3SR](https://gateway.temporal.cloud/ipfs/QmZqSYDQrtWg4LHnqT6DPqa1XUr7u4oeaGcyaTiGHJY3SR). It’s 1.2GB in size and contains a variety of research papers, crypto whitepapers, and I have submitted, as well as other user submitted documents.\n\nAll Indexing and Searching can be done via the gRPC API, for which we have published protocol buffers on [github](https://github.com/RTradeLtd/grpc/tree/master/lensv2). Using these you can build an API for Lens in *any* language that supports protocol buffers!\n\nFor an example of how we use those protocol buffers to build the Lens API client that is in Temporal, you can check out our Golang example below:\n\n```Golang\n\npackage clients\n\nimport (\n\t\"fmt\"\n\n\t\"github.com/RTradeLtd/config/v2\"\n\t\"github.com/RTradeLtd/grpc/dialer\"\n\tpb \"github.com/RTradeLtd/grpc/lensv2\"\n\t\"google.golang.org/grpc\"\n\t\"google.golang.org/grpc/credentials\"\n)\n\nconst (\n\tdefaultURL = \"127.0.0.1:9998\"\n)\n\n// LensClient is a lens client used to make requests to the Lens gRPC server\ntype LensClient struct {\n\tconn *grpc.ClientConn\n\tpb.LensV2Client\n}\n\n// NewLensClient is used to generate our lens client\nfunc NewLensClient(opts config.Services) (*LensClient, error) {\n\tdialOpts := make([]grpc.DialOption, 0)\n\tif opts.Lens.TLS.CertPath != \"\" {\n\t\tcreds, err := credentials.NewClientTLSFromFile(opts.Lens.TLS.CertPath, \"\")\n\t\tif err != nil {\n\t\t\treturn nil, fmt.Errorf(\"could not load tls cert: %s\", err)\n\t\t}\n\t\tdialOpts = append(dialOpts,\n\t\t\tgrpc.WithTransportCredentials(creds),\n\t\t\tgrpc.WithPerRPCCredentials(dialer.NewCredentials(opts.Lens.AuthKey, true)))\n\t} else {\n\t\tdialOpts = append(dialOpts,\n\t\t\tgrpc.WithInsecure(),\n\t\t\tgrpc.WithPerRPCCredentials(dialer.NewCredentials(opts.Lens.AuthKey, false)))\n\t}\n\tvar url string\n\tif opts.Lens.URL == \"\" {\n\t\turl = defaultURL\n\t} else {\n\t\turl = opts.Lens.URL\n\t}\n\n\tconn, err := grpc.Dial(url, dialOpts...)\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\treturn &LensClient{\n\t\tconn:         conn,\n\t\tLensV2Client: pb.NewLensV2Client(conn),\n\t}, nil\n}\n\n// Close shuts down the client's gRPC connection\nfunc (l *LensClient) Close() { l.conn.Close() }\n\n```\nTo actually index data, once you have your gRPC client up and running, all you need to do is called the Index command, and let Lens do its magic! Depending on where the content is in your network this process can take sometime. Generally speaking, if the content is locally available index analysis shouldn't ever take more than a minute, usually 30 seconds. When submitting data for indexing, you must provide two parameters, the ObjectType, which should be using the IndexReq_IPLDas defined in the protocol buffers. The second parameter is ObjectIdentifier which should be the IPFS hash of the content you want indexed.\n\nSearching for data is extremely simple as well, and requires calling the Search command. The only required parameter is Query which defines how you want to search the data. Optionally you can filter out your search results even more with filters like Hashes to only match specific IPFS hashes, MimeTypes to only match specific mime types. The time it takes for this command to complete will depend on a wide variety of factors, such as the size of your index, the number of objects matched, the speed of your disk that the index resides on.\n\n## Thank you and a big shout out to everyone contributing to IPFS and all the great work that is be done by many different projects!\n\nRTrade’s online community, [Twitter](https://twitter.com/rtradetech) or [Telegram](https://t.me/rtradetech) and [website](http://www.rtradetechnologies.com/en/). Don’t forget to show Temporal some love on [Github](https://github.com/RTradeLtd)!\n\n[v2.1.0 of Temporal is out! ](https://github.com/RTradeLtd/Temporal/releases/tag/v2.1.0)\nHighlights of release:\n- go-ipfs v0.4.20\n- ipfs-cluster v0.10.1\n- gomod support\n\n**Temporal:** A versatile easy to use tool for companies with large amounts of data to secure, store and track. The platform can be used as is, or customarily built to manage and deploy blockchain-based applications and non-blockchain data-storage solutions for any enterprise.\n\n**Temporal Features:**\n\nIf you don’t want to run your own Temporal installation you can use our hosted version[, Full Featured Pinning Service](https://temporal.cloud/) w/ Free 3GB/Monthly, 5 Free IPNS record creation a month, 100 Free pubSub messages a month and 5 Free IPFS keys\n\n[Interface walk-through](https://medium.com/@rtradetech/temporal-cloud-walk-through-c477568be551)\n\n[Full Service IPFS API](https://gateway.temporal.cloud/ipns/docs.api.temporal.cloud/)\n\n[Temporal-JS SDK Full public IPFS and IPNS usage](https://github.com/clemlak/temporal-js)\n\n[IPFS Gateway](https://gateway.temporal.cloud)\n\n[I2P IPFS Gateway access](http://cdii3ou5mve5sfxyirs6kogt4tbvivk2d6o25awbcbazjrlhjeza.b32.i2p)\n \n[Installing your own Temporal](https://rtradetechnologies.atlassian.net/wiki/x/U4JIAw)\n\nAlso the [Usages and Features](https://github.com/RTradeLtd/Temporal) section of the README.md doc on the GitHub repository covers using the docker compose file to spin up the environment.\n\n### **Anything you build or use on our platform is NOT vendor locked-in. All software solutions currently available can be run in your own infrastructure simply by downloading our code off of github**\n\n![](https://cdn-images-1.medium.com/max/2000/1*TRZNxp9hh6ZjZha9R1RmFQ.png)",
      "json_metadata": "{\"tags\":[\"cryptocurrency\",\"blockchain\",\"ipfs\",\"storage\",\"search\"],\"image\":[\"https://cdn-images-1.medium.com/max/2000/1*7gnii4YYVJ_eloYkU27Y6g.jpeg\",\"https://cdn-images-1.medium.com/max/2000/1*TRZNxp9hh6ZjZha9R1RmFQ.png\"],\"links\":[\"https://github.com/RTradeLtd/Lens\",\"https://temporal.cloud/lens\",\"https://gateway.temporal.cloud/ipfs/QmZqSYDQrtWg4LHnqT6DPqa1XUr7u4oeaGcyaTiGHJY3SR\",\"https://github.com/RTradeLtd/grpc/tree/master/lensv2\",\"https://twitter.com/rtradetech\",\"https://t.me/rtradetech\",\"http://www.rtradetechnologies.com/en/\",\"https://github.com/RTradeLtd\",\"https://github.com/RTradeLtd/Temporal/releases/tag/v2.1.0\",\"https://temporal.cloud/\",\"https://medium.com/@rtradetech/temporal-cloud-walk-through-c477568be551\",\"https://gateway.temporal.cloud/ipns/docs.api.temporal.cloud/\",\"https://github.com/clemlak/temporal-js\",\"https://gateway.temporal.cloud\",\"http://cdii3ou5mve5sfxyirs6kogt4tbvivk2d6o25awbcbazjrlhjeza.b32.i2p\",\"https://rtradetechnologies.atlassian.net/wiki/x/U4JIAw\",\"https://github.com/RTradeLtd/Temporal\"],\"app\":\"steemit/0.1\",\"format\":\"markdown\"}"
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      "title": "",
      "body": "I don't know if you have heard about utopian, utopian support open source project like yours. Sorry for cheetah flagging down your post. You can always join utopian discord channel [here](https://discord.gg) good luck and have fun.",
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      "title": "",
      "body": "I was about to rant about plagiarism but holy shit, you're the author indeed. (unless someone compromised this name on Steem)\n\nMaybe try contacting whoever makes this anti-plagiarism measure (not sure if cheetah is the creator or the bot)\n\nPosted using [Partiko Android](https://partiko.app/referral/katamori)",
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      "title": "",
      "body": "!cheetah unban\n\nAccount verified.",
      "json_metadata": "{\"tags\":[\"ethereum\"],\"app\":\"steemit/0.1\"}"
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      "author": "rtrade",
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      "title": "",
      "body": "This is such bullshit, all because I refused to verify my account with some unknown third-party service?",
      "json_metadata": "{\"tags\":[\"ethereum\"],\"app\":\"steemit/0.1\"}"
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      "permlink": "cheetah-re-rtradeefficient-usable-and-cheap-storage-of-ipfs-hashes-in-solidity-smart-contracts",
      "title": "",
      "body": "Warning! This user is on my black list, likely as a known plagiarist, spammer or ID thief. Please be cautious with this post!\nIf you believe this is an error, please chat with us in the #cheetah-appeals channel in [our discord](https://discord.gg/7FkETjJ).",
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{
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  "op": [
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    {
      "parent_author": "",
      "parent_permlink": "ethereum",
      "author": "rtrade",
      "permlink": "efficient-usable-and-cheap-storage-of-ipfs-hashes-in-solidity-smart-contracts",
      "title": "Efficient, Usable, And Cheap Storage Of IPFS Hashes In Solidity Smart Contracts",
      "body": "![](https://steemitimages.com/p/C3TZR1g81UNaPs7vzNXHueW5ZM76DSHWEY7onmfLxcK2iP9NnDPd8cYgNcNPAgCHxWtpiRzAc3VPR8tn2BRS41v4wLj1g6J1mqvtWTX7e1pTL9Hbpc4G9mg?format=match&mode=fit&width=640)\n\n# Efficient, Usable, And Cheap Storage Of IPFS Hashes In Solidity Smart Contracts\n\nRecently while working on a new project, I encountered the need to store IPFS Hashes, in particular CIDv1 type on the ethereum blockchain, in a user-friendly but also gas efficient manner. Why CIDv1? Well CIDv0 uses sha2-256, whose output size does not fit into a single `bytes32` storage slot. From what I've seen in the wild, anytime people need to store IPFS hashes in smart contracts, it's almost always a hash of the IPFS CID stored in a `bytes32` storage variable, or the IPFS hash itself stored in a `string` storage variable. Working with CIDv1 does not suffer from this :)\n\nWhile there is nothing wrong with either of those two approaches, they are suboptimal. Hashing a hash simply to fit into a single storage slot makes it significantly harder to consume and is only worthwhile if you need to do so for security reasons. Storing the IPFS hash in a `string` storage variable is very expensive in general, and also suboptimal.\n\nThe trick here is being able to fit into as few, but fully occupied storage slots as possible (efficient), while being easy to consume (usable) and using minimal gas (cheap). This sounds simple in theory as all you need to do is find a hash function that takes up a single `bytes32` storage variable, or two `bytes32` storage variables, but because IPFS uses multiformats (or more appropriately, multihash) this isn't as easy as it sounds. To figure this out, we're going to need to talk a bit about multihash.\n\n## Multihash\n\n[Multihash](https://multiformats.io/multihash/) is a subset of the [multiformat](https://multiformats.io/) specification and allows us to create [self describing hashes](https://github.com/multiformats/multihash). The format for multihash looks like (image is from github.com/multiformats/multiformats):\n\n![](https://raw.githubusercontent.com/multiformats/multiformats/eb22cd807db692877a9094b5bfb4d2997fd0278a/img/multihash.006.jpg)\n\nSo given the above, this means that even if you were able to find a hash function whose output is 32 bytes, multihash would then add an additional 4 bytes onto that for a total of 36 bytes. This means we then need to store it in a `bytes` storage variable which has a single word overhead.\n\n## Solution\n\nThis then lead me to the question, what if we can find a hash function which when in multihash format takes up a single `bytes32` storage slot we would be good to go! Well not quite, the only multihash that did this was `blake2b-136`, which `go-ipfs` nodes don't accept by default due to security risks... yikes!\n\nAfter several hours of different experimentation (aka blindly trying multihashes), I was finally able to find a hash function which when in multihash the output is 64 bytes, which means we can store this in exactly two `bytes32` storage slots, completely filling two slots and not wasting any. The multihash is `blake2b-328`. So to use this, all we need to do is take the 64 bytes output, split it in two and we're good to go!\n\n![](https://gateway.temporal.cloud/ipfs/QmR5uZMmt6rzsyW4iyHjFSb8ieUqqrWJWz7ea2iA6pBV1M)\n\n## Example\n\nTo keep things short, I'll demonstrate the most optimal solution I found after trying a few different combinations and ways to store two `bytes32` storage variables.\n\nThe first step is two define two parts of the hash, `hashPart1` and `hashPart2`. In order to store our IFPS hashes here, we need to take the 64 bytes output of the `blake2b-328` multihash, split it in half, storing each half within a 2 element array of `bytes32` type, passing that into the function `updateHash`.\n\nNow, whenever we want to consume this data, all we have to do is call `getHash` which will return the complete hash in `bytes` type. If you're consuming this in a mobile phone DApp, then all you need to do is convert to string, which in golang would be `string(returnedBytes)` and you have your IPFS Hash in plaintext!\n\n\n```solidity\npragma solidity 0.5.7;\n\ncontract Hash {\n    \n    bytes32 public hashPart1;\n    bytes32 public hashPart2;\n\n\n    function updateHash(bytes32[2] memory _hash) public returns (bool) {\n        hashPart1 = _hash[0];\n        hashPart2 = _hash[1];\n        return true;\n    }\n\n    function getHash() public view returns (bytes memory) {\n        bytes memory joined = new bytes(64);\n        bytes32 h1 = link.currentHash[0];\n        bytes32 h2 = link.currentHash[1];\n        assembly {\n            mstore(add(joined, 32), h1)\n            mstore(add(joined, 64), h2)\n        }\n        return joined; \n    }\n\n}\n```\n\nSo does this actually save gas, or did I just waste your time?\n\n\n## Gas Consumption\n\nTo test gas consumption, i wrote the following fairly ugly test contract to measure gas consumption. To get cas costs, I would check the `CumulativeGasUsed` field of the transaction receipt. Tests were ran on a local private PoA chain on my laptop with a 1sec block time, using `geth 1.8.27-stable`.\n\nThe functions `updateLink`, `updateLinkHash` and `updateLinkParts` are used to test gas costs from different ways of storing data in two `bytes32` storage slots. The function `setCID` is used to test gas costs for storing a hashed IPFS hash.. The function `setCIDString` was used to test gas costs from storing the plaintext (aka string) version of the IPFS hash.\n\n```solidity\npragma solidity 0.5.7;\n\ncontract GasTest {\n\n    string public hashString;\n    bytes32 public hash;\n    bytes32[2] public linkHash;\n    bytes32 public linkPart1;\n    bytes32 public linkPart2;\n    LinkObject private link;\n\n    struct LinkObject {\n        bytes32[2] currentHash;\n    }\n\n    function updateLink(bytes32[2] memory _newHash) public returns (bool) {\n        link.currentHash = _newHash;\n        return true;\n    }\n\n    function updateLinkHash(bytes32[2] memory _newHash) public returns (bool) {\n        linkHash = _newHash;\n        return true;\n    }\n\n    function updateLinkParts(bytes32[2] memory _newHash) public returns (bool) {\n        linkPart1 = _newHash[0];\n        linkPart2 = _newHash[1];\n        return true;\n    }\n\n    function setCID(bytes32 _cid) public returns (bool) {\n        hash = _cid;\n        return true;\n    }\n\n\n    function setCIDString(string memory _cid) public returns (bool) {\n        hashString = _cid;\n        return true;\n    }\n}\n```\n\nAnd the results of cumulative gas usage from the above contract is\n\n\n| Function | Cumulative Gas Used |\n|------|---------------------|\n| updateLink | 66360 |\n| updateLinkHash | 66426 |\n| updateLinkParts | 66071 |\n| setCID | 43810 |\n| setCIDString | 86213 |\n\nInitially you might be looking at the gas cost for `setCID` and start thinking that I just wasted your precious time. However, we need to consider the fact that this isn't actually just the IPFS hash. It is a hash, *of* the IPFS hash. So while this may be gas efficient, it is not easy to consume outside of smart contracts, and is abysmal at best to consume within other smart contracts because:\n\n1) We need to store a plaintext copy of the hash somewhere accessible by the smart contract (storage)\n2) We need to read the plaintext data from storage, hash it, then compare the two hashed hashes.\n\nNow after considering that, the gas prices for the hash storage methods being talked about here (66071 -> 66360 depending on the method being used), combined with the fact that there you can store+consume the hashes as is, seems pretty useful in my eyes.\n\n\n\n## Takeways\n\n* Use `blake2b-328`\n* Cast to bytes\n* Store in 2 `bytes32` storage slots\n* ???\n* profit!",
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