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      "body": "Congratulations @berkes! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@berkes/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/@berkes)_</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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      "title": "The Private Blockchain Fallacy",
      "body": "In all the blockchain hype, a simple, yet self-refuting idea\nkeeps popping up: a *Private Blockchain*.\n\n**This post originally appeared [on my blog](https://berk.es/2018/09/19/the-private-blockchain-fallacy/)**\n\nIn order to understand why a *private blockchain* is nonsense, we must\nfirst define what a block chain is and what it is not. Since Nakamoto\n[coined (PDF)](https://bitcoin.org/bitcoin.pdf) the term, lets see if\nhis description helps:\n\n> a peer-to-peer distributed timestamp server to generate computational\n> proof of the chronological order of transactions\n\nIt does highlight some important traits of \"a block chain\" (Nakamoto\nused a space between both words, I use the current popular term\nblockchain):\n\n* peer-to-peer: implying distribution; at least ruling out a central\n    authority\n* computational proof: implying it to be verifiable\n* timestamp-server/chronological ordering: it's goal, but also implying\n    permanence\n\nMarco Iansiti and Karim R Lakhani have a [more accessible explanation](https://en.wikipedia.org/wiki/Blockchain):\n\n> an open, distributed ledger that can record transactions between two\n> parties efficiently and in a verifiable and permanent way.\n\n* open (often called *permissionless*)\n* distributed (often called *decentralized*)\n* verifiable\n* permanent (often called *immutable*)\n\nIn other words: anything that does not match those criteria, is by\ndefinition, not a blockchain. It may be something similar, or even\nsomething using similar techniques, but not *a blockchain*. This is\nimportant.\n\nWe can also look at it from the other side: if a blockchain offers these\ntraits, when do we need a blockchain?:\n\n![logical graph to determine if one needs a blockchain](/images/inline/do_you_need_a_blockchain.png).\n\n(I downloaded this image years ago and forgot to note the author.\nSorry.)\n\nThis has the same treats, but turns the argument around: if your\nrequirements don't fit the exact things that blockchain offer: you don't\nneed a blockchain. In the case of a *private blockchain*: if it is not\npublic, you don't need a blockchain. We could stop here.\n\n## Reasons for wanting a *private blockchain*\n\nSo, why do people come up with private blockchains in the first place?  We can group the arguments into three main arguments. I'll add a fourth.\n\n1. So we can store private data or other kinds of data that should not\nbe public. (We scrap the *open* and *verifiable* parts for privacy)\n1. So we can control who has read/write access (We scrap the *open*\npart for control)\n1. So we can scale better (We scrap the *distributed* part for speed). \n1. Because we are not yet confident enough about the security and exact\ntraits to release on a public platform (We scrap the *permanent* part\nfor flexibility)\n\nThe fourth is the only valid argument to ever use a private blockchain:\nas a temporary phase because you are still developing and finding out\nthe ins- and outs of your blockchain-application: very similar to how\nyou first release an app to your five friends and not upload it\nimmediately to an app store. \n\nAll others reasons are pure nonsense, because they don't *need a\nblockchain* to get the exact same outcome. Or because by definition,\ndeploying that way, makes it *not a blockchain*. One could say, that by\ndeploying a blockchain in a private environment, it stops being a\nblockchain.\n\nBut, there is more than just a play of words. Keep tuned.\n\n## Private data: public.\n\nA blockchain has to be public in order to ensure *permanence* or\n*immutability*.\n\nLet's compare a blockchain to a household book. When I have such a book,\nin a drawer in my office, I'm the only one who can read it and change\nit.\n\nSo, when for some reason I bought a pair of expensive shoes, and a week\nlater want to hide that fact, I can simply remove that line from the\nbook. Or overwrite it with \"pair of scissors\". And boom. I never bought\nshoes (according to the book).\n\nBut if that book is accessible amongst family members, for everyone to\nreview, or copy, it becomes a little more \"immutable\".  I can still\nremove the \"expensive shoes\" line, but people might know, and\nfamily-members can call me out on it. With even more people who can\naccess the book (why not mail a weekly copy to all family and friends?)\nthe harder it becomes to change stuff afterwards.\n\nA blockchain, however, has an additional trait: through\napplied cryptography, it allows one to easily detect when a line is\nchanged. So all people who have a copy can detect with certainty and\neasily that something has been changed that should not have been\nchanged. But this trait is only useful if other stakeholders can get\ncopies. In a private blockchain it is really easy to change something,\neven when that change has a big, clearly visible effect. Simply because\nthere is no-one to witness that clearly visible effect!\n\nThe *public* part, is what ensures the permanency. Not because it is\nimpossible to change something (it is perfectly doable) but because that\nchange, or its cryptographically effects, are seen by, other\nparticipants.\n\nBitcoin, for example is not permanent either, in theoretic sense. If\nenough participants decide that the 0.01 BTC that you paid to John a\nyear ago, is sent to Mallory instead, that is what will happen: [history\nwill be rewritten](https://blog.ethereum.org/2016/07/20/hard-fork-completed/).\nBitcoins *Immutability* stems from the fact that anyone can detect such\na change, and that a vast majority then needs to acknowledge that\nchange.\n\nThe *public* part furthermore ensures that those participants will get\nhurt when making such a retrospective change: they have a stake in the\n(Bitcoin) blockchain, which will decrease in value because they just\nhave proved that this blockchain can be retrospectively mutated.\n\nIn a blockchain, public, or private, *immutability* is more of an\nagreement amongst all participants that *we won't change history.\nPromised!* it is not some magical \"thing that comes from cryptography\".\nIn a private blockchain that promise is easy to make. And even easier to\nenforce: if Mallory changes some old record, just throw him out!\n\nWith that in mind: immutability is an agreement, so you can just choose\nany database, even a shared excel sheet, and then promise each other\nnever to change anything. All you need is detection that something was\nchanged, which most database systems (or logging) will offer. You can\neven add some cryptography to it to make tampering more obvious or\neasier to revert or deal with.\n\n## Permissionless because we need control.\n\nA blockchain has to be permissionless in order to ensure *permanence*.\n\nThis is very simple actually. If you can control who has access, you\ncontrol who decides what the truth is. Therefore, you hold the keys to\nchange history in any way that you want. \n\nIn the analogy of the household book, the person who controls who may\nwrite in the book and who may read from it, is, by extension, the person\nwho controls what will get in the book and what not.\n\nThat person is, by extension, also the one in full control of rewriting\nthe history. Because when the access-controller wants something changed,\nhe can simply remove anyone opposing that change from write (and read)\naccess and then promote himself (or a proxy) to be able to write. And\nthen change it.\n\nIf other people can still read, they might notice that history is\nrewritten, but will lack all power to do something about it. The truth\nis what is in the blockchain, and they cannot change that, because of\nlack of permissions. It matters little how clumsy or detectable such a\nretrospective change is: the one with access control can, through that\npower, make these changes.\n\nImmutability in a blockchain is not something magical that comes from a\nfancy technology . But it comes from the conditions a blockchain requires: the\nenvironment, or \"world\" in which it runs make it immutable.\n\nThe irony is that, actually, there is a magic technology that ensures\nimmutability. And that technology is called blockchain. And hence *has*\nto be a public blockchain. We've come full-circle.\n\n## No Distribution because of scaling or speed.\n\nA blockchain has to be distributed in order to ensure *a verifiable truth*.\n\nThe opposite of distribution is centralization. To follow the \"household\nbook\" analogy, distribution would mean that several times a day (maybe\neven after every change) copies are made and exchanged amongst people.\nMore important, however, is that none of these copies is considered \"The\nTruth\".\n\nIf there is only ever one copy of the household book, changing stuff in\nthere (like ripping out a page) is trivial and -if done well- undetectable.\n\nThe obvious solution would be to photocopy every page (say, daily) and\nkeep those copies in multiple places. This is distribution. This is\ninefficient, slow and expensive, as opposed to having one copy and simply trusting that.\nBut in essence what a blockchain does. Because of the exact reason of\ntrust: so that we don't *have to trust one copyholder to tell us the\ntruth*. This is the *trustless* nature of a blockchain.\n\nWhen all the copies at all moments can be considered *the truth* any\ndifference between any copy will be detectable and should trigger an\nalarm. We then need a conflict resolution: which one is the truth. \n\nIn Bitcoin, they simply say: what the majority of copy-holders have is\nthe truth. So if your book is copied amongst five people and two have in\nthere \"berkes bought expensive shoes\" but three don't, berkes did not\nbuy expensive shoes.\n\nIf only one book is elected as The Truth, and all others are simply\ncopies that could be used to proof that something was there at some\npoint, that really proves nothing: who is to say the person holding the\ncopy did not forge some records in there?\n\nDistribution amongst all participants is crucial, because any central\nauthority can otherwise change history at will and without detection:\nVerification is not possible and trust in an authority, or even a small\ngroup of authorities, is required.\n\nTo turn it around: when you don't need that trustlessness, when you can\ntrust a central authority, you don't need a blockchain. To turn it\naround again: if it requires trust, has an authority, by nature, it is\nnot a blockchain.\n\n## But what about my favorite coin? \n\nIf it has a \"private\" or \"permissioned\" blockchain, it is not using a\nblockchain. It might still be a cryptographically backed database, a\nsolid cryptocurrency of very modern database, but it simply is not using\na blockchain. And because it is not using it, it lacks one or more of\nthe crucial traits. \n\nWhich means a single company could run away with your coins at any\nmoment (yes, Ripple, looking at you). Or which means it is fundamentally\ninsecure. Or it may offer very interesting solutions nonetheless.\n\nI can probably build a very useful and interesting monetary exchange system\nbased on trust and a Google spreadsheet. But it ain't a blockchain. It's\n\"just\" a spreadsheet on a Google server (with a really novel idea\naround it).\n\n## \"You say tomato, I say tomato\"\n\nSure. If you want to call any *database* a blockchain, go ahead. If you\ninsist on calling a Google spreadsheet a blockchain: fine. Its not some\nprotected or trademarked term. You are even allowed to call my bicycle a\nblockchain. It has a chain after all.\n\nBut this helps no-one. Because you are either reinventing a wheel, or\nyou are using an extremely inefficient technology in a place where far\nbetter fitting, more efficient technologies would help you far better.\n\nSome *private blockchains* are not blockchains because they are simply\nother technologies. \n\nBut unfortunately most *private blockchains* are really just\ninefficient, insecure or simply stupid implementations in which a public\nblockchain-setup is used behind closed doors. This offers none of the\nbenefits of that public version, but all of the downsides. \n\nTake git: git is not a blockchain; git is [a\nDAG](https://medium.com/girl-writes-code/git-is-a-directed-acyclic-graph-and-what-the-heck-does-that-mean-b6c8dec65059);\nso don't call it a blockchain. A DAG is very elegant, efficient\ndata-structure. That could even be used for distributed data-storage\nwithin a small group of participants that need some\ncryptographically-secure tamper-detection of their data. I'm mentioning\ngit, because there are some cryptocurrencies that do exactly this: using\na DAG to share truth amongst a private set of participants.\n\nOr take BitTorrent: BitTorrent is not a blockchain; so don't call it\nthat. BitTorrent is a very neat implementation of Merkle trees, and\nreally brilliant for distributing large amounts of data over a large\namount of participants. Not a blockchain. I'm mentioning it, because\nthis technology is often enough if you need to ensure that all\nparticipants have a copy of the data.\n\nThere are literally thousands of types of databases out there, some\nallow ridiculously [easy syncing](https://couchdb.apache.org/), others\nallow [insane throughput](https://redis.io), again others allow really\nthorough consistency checks. Or cryptographically signed logs. Or\nencryption of the data, or sharing of parts of data, or ... I could go\non. We don't call all these \"blockchains\" because of a hype. They are\nnot: They are proper solutions to a specific use-case. A blockchain is\none such solution, and like most technology, it applies to a very small\nsubset of use-cases. A *private* version, however, can never be such a\nsubset.\n\nPositive feedback, as well as images of cats, calling me names, for\nhating on your beloved altcoins, or other comments are very welcome at\n[my twitter](https://twitter.com/berkes) or [on\nreddit](https://www.reddit.com/u/berkes).",
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      "body": "@@ -724,17 +724,17 @@\n you don'\n-w\n+t\n  have or\n@@ -812,18 +812,18 @@\n or examp\n-e\n l\n+e\n  with:%0A%0A\n@@ -2316,17 +2316,16 @@\n emp%60 att\n-t\n ribute.%0A\n",
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      "title": "Mirror files from the web to IFPS with wget-to-ipfs",
      "body": "In an attempt to make several large files available on IPFS and 'update' them weekly, I wrote  some scripts that I can run a server. It is commandline only. A result can be seen at [IPFS hash QmRfvcwg51iDzmcnkuB6wErAtyUwbgS8VUyT95aHs2AT39](https://ipfs.io/ipfs/QmRfvcwg51iDzmcnkuB6wErAtyUwbgS8VUyT95aHs2AT39) (a short while after releasing this post anyway).\n\nToday we'll focus on the first script: it downloads a file, then adds it to IPFS. Optionally in a directory.  It is available [on my git repo](https://git.webschuur.com/placebazaar/wget-to-ipfs). \n\n## Quick start\n\nYou can clone or download the script, then run it.\n\n    git clone https://git.webschuur.com/placebazaar/wget-to-ipfs.git\n    cd wget-to-ipfs\n\nOr, if you don'w have or know git. Download the wget-to-ipfs.sh file, and make it executable, for exampel with:\n\n     chmod +x wget-to-ipfs.sh\n\nNow run it.\n\n    ./wget-to-ipfs.sh --url=http://example.com/file.pdf\n\nOptions are shown with `wget-to-ipfs.sh --help`\n\n## Why?\n\nWhen you have files locally, there's no need for this wrapper; IPFS has enough tooling to add and manage entire directories. But when the files are only available on the web, downloading and adding them in one go is useful. Especially if they are large files. \n\nI developed this for [placebazaar](https://placebazaar.org) where we want to make weekly Open Street Map database files available on the permanent, uncensurable web: IPFS. Maintaining the database files on a server (next to the IPFS repo) requires large disks, which is expensive. So a script that can run weekly, download the latest files and then publish them on IPFS was developed.\n\nYou too may have a list of URLs which you want to make available on IPFS. If so, this script may help.\n\n## How does it work?\n\nIt needs both  `ipfs` and `wget` to be installed, initialized and runnable.The script has a lot of boilerplate, taken from [bash3boilerplate.sh](http://bash3boilerplate.sh/).\n\n Most Linux/Unix distributions have wget installed by default. And if not, installing it is easy, since wget is one of the most used tools. [Installing  IPFS](https://ipfs.io/docs/install/) is a bit more involved, but should not be too hard. \n\nThe script downloads the file using `wget` and writes it into a temporary file. This file has a default and is settable with the `--temp` atttribute.\n\nIt then reads that file and adds it to IPFS with `ipfs add < /tmp/wget-to-ipfs`. It uses redirection because when IPFS is installed on Ubuntu with snap, the snap-sandbox prohibits reading most files. Redirecting circumvents this: `ipfs add /tmp/wget-to-ipfs` requires that the `ipfs` command (inside the snap sandbox) has access to /tmp/wget-to-ipfs` which is not the case. Whereas `ifps add < /tmp/wget-to-ipfs` requires that the user running the command (and not the command itself) can read the file. Which is the case.\n\nAfter that, the optional `--root` flag allows you to add t he file into a \"directory\". IPFS is a tree-structure, so adding it to a directory is similar to \"linking it to a directory hash\". Which is what the script does with `ipfs object patch [root-hash] add-link [filename] [file-hash]. \n\nIPFS allows creating an empty, then adding a file as follows:\n\n    _dir_hash=$(ipfs object new unixfs-dir)\n    _file_hash=$(ipfs add ./cv.pdf)\n    ipfs object patch ${_dir_hash} add-link file.pdf $_file_hash\n\nThis results in a new hash: IPFS is immutable, so \"adding a file to a directory-hash\" will have to result in a new directory hash. So, if you want to add multiple files, the logic would be:\n\n    _dir_hash=$(ipfs object new unixfs-dir)\n    _file_hash=$(ipfs add ./cv_2017.pdf)\n    _dir_hash=$(ipfs object patch ${_dir_hash} add-link file.pdf $_file_hash) # Overwrite _dir_hash\n    _file_hash=$(ipfs add ./cv_2018.pdf)\n    ipfs object patch ${_dir_hash} add-link file.pdf $_file_hash\n\nThe last result will be the hash of the directory with all the files added. Intermediate hashes are those of directories with fewer files.\n\n## Downloading a set of files and adding those.\n\nKowing this, we can download a list of URLs from a file `urls.txt` and add them, incrementally, to a directory as follows:\n\n    export _dir_hash=$(ipfs object new unixfs-dir)\n    for url in $(cat  urls.txt)\n    do\n       _out=$(wget-to-ipfs --url=\"${url}\" --root=\"${_dir_hash}\" --temp=\"/root/wget-to-ipfs\")\n       _dir_hash=$(echo \"${_out}\" | grep root | cut --delimiter=\" \" --fields=2)\n    done\n    echo \"new dir: ${_dir_hash}\"\n\n## Next\n\nManaging the pins, garbage collection, and publishing the results using DNSLink.",
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