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      "body": "The latest [repository](https://github.com/megacortex/scryp)\n\n## Completion\nThe initial stage of Scryp development is complete. The final step was to enhance the user interface (UI) to display transactions involving the client account in a scrolling text box.\n\nTesting revealed that the client is not always able to verify the consensus of the servers because it does not always receive at least two of three torrents fro the servers. There must still be another bug in the NPM bittorrent-dht package or its dependencies, beyond the two I have already found and reported. Evidently, the client is able to retrieve the list of torrents from the fixed server DHT locations, because the .boot file saves frequently visited nodes. But every new torrent is located in another part of the DHT network, which the bittorrent-dht package is unable to find as it should. I'll work on finding that bug next, and maybe even write my own version.\n\nAside from this problem, which is fixable, the Scryp software works well, even with only a one-minute consensus interval when the account balances database is not too large. For a very large number of accounts, it would be sensible to use a greater interval.\n\nFuture development would include:\n* Extensive testing before actual deployment, with special emphasis on security\n* An improved UI with features such as account aliases and a QR code generator/reader\n\nBut I will end this series of articles here.\n\n## Conclusion\nThus far, no one is interested in using this software but I thought it worthwhile to create it for my own education but also to make a point: It's possible to create a simple cryptocurrency consisting of less than one thousand lines of Node.js code, in one month by oneself, with modest programming skills and without using a blockchain.\n\nTherefore, it may be that:\n* Blockchains may be somewhat overrated compared to previously existing breakthrough technologies; digital signatures, crytpographic hashing, distributed hash tables, torrents and the internet itself are perhaps more significant.\n* Blockchain cryptocurrencies, especially those that use vast amounts of electricity, may be displaced by more clever uses of the previously existing technologies.\n* Many of the hundreds of existing cryptocurrencies may be overvalued.\n\nAnother important point is that all of the big cryptos have a significant degree of central control, and in some cases their success is due to a single prominent person, thus defeating one of the original motivations for cryptocurrencies, decentralization.\n\nThe current speculative mania in the crytpo markets is reflective of a mass consciousness still dominated by a belief in scarcity, when real abundance is the result of local communities sharing with each other and caring for their natural environment. Technology such as cryptos can either increase abundance or promote scarcity and wealth inequality, depending on the consciousness of those using them.\n\nHalf of all bitcoins (currently worth about $20 billion) are owned by only a few thousand entities, or less than 0.1% of all bitcoin wallets. Sound familiar?\n\n*Crypt* is available to be used by any local community under the BSD-3 licence.\n\n[< part 13](https://steemit.com/cryptocurrency/@metacortex/creating-a-simple-cryptocurrency-part-13)",
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      "body": "The latest [repository](https://github.com/megacortex/scryp)\n\n## Combining server.js and client.js into scryp.js\n\nThe next stage of development is to enhance client.js to have a user interface (UI) with a form and button for making a payment and server monitor showing the balance of the client account and recent client transactions. Since much of the same code needs to be used, it makes sense to combine server.js and client.js into one program scryp.js, which will be easier to maintain.\n\nIn this article, we concentrate on the UI and payment form/button and leave the server monitor for the future.\n\n## [Electron](https://electron.atom.io/) user interface (UI)\n\nWe are using Javascript/Node.js code for our server program, which does not need a user interface. It can be launched from the command line in a console window, with port numbers as arguments. The program loads the `.seed`, `.keys` and `.boot` files and then logs its activities, which can be redirected to a log file. Javascript was created for browsers, which are user interfaces; then Node.js adapted Javascript to function as a server and/or interact with the operating system/file system, and able to function *headless* (without even a console window).\n\nNode.js has become so popular that naturally attempts have been made to give it a UI. A natural fit with Node.js would seem to be browsers, because they have a UI, visually and structurally controlled by CSS and HTML, with behavior controlled by Javascript. But the technical obstacles are formidable. Electron is the best solution I have found, a relatively clean and complete union of the two technologies; it contains both Node.js and the Chromium browser.\n\nWe will use Electron for our client UI, at first consisting of just a payment form/button.\n\n## Installing Electron\n\n1. Determine if Electron is already on your system, and which version it is: `$ electron -v`. It will be on your system if you are using [Atom](https://atom.io/), for example, as I do.\n1. If Electron is not on your system, you must install it. It is probably available in your operating system's repository. See below for a way to install it via NPM.\n1. Chances are good that the version of Node.js embedded in your version of Electron is not compatible with the version of Node.js already on your system. To check this, first get the Node.js version: `$ node -v`. Determine the ABI (application binary interface a.k.a NODE_MODULE_VERSION) from [this table](https://nodejs.org/en/download/releases/). Compare it with the Electron ABI like so: `$ electron --abi`. On my system the former is 57 while the latter is 50.\n1. If they are, in fact, incompatible, you must have a separate node_modules directory for downloaded NPM packages needed by the client, including any needed by Electron. In this case, it is best to have a separate client directory containing a node_modules subdirectory and all other programs needed by the client (such as scryp.js), without any other node_modules directory higher in the directory tree.\n1. Place the shell script [npm-electron](https://raw.githubusercontent.com/megacortex/scryp/master/npm-electron) in your directory of executables (which is included in `$PATH`), and make it executable:  `$ chmod +x npm-electron`. This script adapts the npm program to install NPM packages compatible with your version of Electron and its embedded Node.js. Edit it as needed. Probably the only change needed is to replace the version number of Electron with your version.\n1. Create a client directory neither above nor below any server directories in the directory tree. Change into it.\n1. If Electron is not already installed, install it with npm globally and in your directory for executables: `$ npm install electron -g; npm install electron`. Put its version number in the npm-electron script.\n1. Use npm-electron to download the following packages, using commands like `$ npm-electron install package-name`:\n    1. ed25519-supercop \n    1. webtorrent\n    1. jquery (for easier control over the UI)\n    1. object-entries (a shim needed for older versions of Node.js that are not ECMAScript 2017 compatible)\n    1. [email protected] ( needed only for programmatic access to the *remote* module of electron, if it is already installed on your system and has version number x.y.z, which must also match the version number in npm-electron)\n1. Use `npm-electron ls -depth=0` to check the top-level contents of the node_modules directory that has been created in the new client directory.\n1. As explained in a previous article, two of the webtorrent dependencies bittorrent-dht and k-rpc must be overrided or overwritten. Now, download repaired versions of [bittorrent-dht](https://github.com/megacortex/bittorrent-dht/archive/master.zip) and [k-rpc](https://github.com/megacortex/k-rpc/archive/master.zip), rename them without the `-master` extension, then copy them over their buggy counterparts in the node_modules directory (after first saving them somewhere for future use, if needed). Eventually, this step can be skipped.\n1. Put the files [index.js](https://raw.githubusercontent.com/megacortex/scryp/master/index.js), [index.html](https://raw.githubusercontent.com/megacortex/scryp/master/index.html) and [scryp.js](https://raw.githubusercontent.com/megacortex/scryp/master/scryp.js) into the client directory. Note that scryp.js can be used without modification in either a client directory or a server directory. It is best to link scryp.js to the main copy in your executable directory, to avoid out-of-sync files.\n1. Copy or preferably link from a server directory a `.keys` file containing the server public keys to your new client directory. The `.seed` and `.boot` files will be created automatically.\n1. The node_modules directory used by servers should be moved into the directory for executables, after overwritting the bittorrent-dht and k-rpc subdirectories as described above. It should contain the same packages as its client counterpart, except installed by npm rather than npm-electron. And the old server.js program in that directory should be replaced with scryp.js.\n\nThis procedure is rather complicated and it would be unreasonable to expect a typical user of Scryp to follow it. But it should eventually be possible to create a single platform-specific downloadable executable file with the NPM [electron-builder](https://www.npmjs.com/package/electron-builder) package.\n\n## Testing the client\n1. In the console window, change to the new client directory.\n1. Launch the client: `$ electron index.js port-number` or `$ electron .` to use the default torrent/dht port.\n1. A Chrome window opens with a payment form consisting of two entry fields *Payment* and *Payee* and a button *Send Payment*.\n1. Meanwhile, the program continues to log reports to the console, showing the configuration, initialization and which of the servers is the current alpha/beta server. One of the items in the console is a newly created public key.\n1. Launch three servers and use pay.js to send a payment to the new account. Or, temporarily substitute the `.seed` file of a server for the newly created `.seed` file and restart the client, just to make a payment to the new account.\n1. Return to the Chrome window and enter a payment amount and a payee public key, belonging to one of the three servers or a random key.\n1. Click the payment button and observe to which server the payment is sent. The client automatically determines the correct server and whether the blackout is in effect. The payment is sent regardless of whether the destination server is running.\n1. Since the client is unaware of its own account balance, it does not yet check if the payment is more than the balance, but it does check that the maximum payment 2^32 -1 is not exceeded.\n1. The *Payee* is verified to be 64 hex-digits.\n1. Notice that the client window has a menu, including *View -> Toggle Developer Tools* which opens the Chrome developer tools including a console window which will display the output of any `console.log` statements in scryp.js.\n\nTo be continued...\n\n[< part 12](https://steemit.com/cryptocurrency/@metacortex/creating-a-simple-cryptocurrency-part-12)",
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      "body": "The latest [repository](https://github.com/megacortex/scryp).\n\n## The wt object (WebTorrent)\n\nIf every member of a Scryp community was a server, the project would be almost complete (except for a convenient user interface). In a practical situation, only a few members are servers and the rest are clients. Clients could now send payments, but they couldn't monitor the servers to see if their payments are processed.\n\nThe servers could operate an HTTP server which responds to requests from clients, but for large communities the request load could be large enough to interfere with essential server processing. This task could be offloaded to dedicated HTTP servers; the servers would only need to update these adjunct servers and let them handle the request load and archival storage, for that matter.\n\nBut instead, we make the design choice to use another breakthrough technology: [WebTorrent](https://webtorrent.io), a version of Bittorrent that can run in some browsers but can also run as a node.js program. WebTorrent makes use of Bittorrent's Mainline DHT, but cannot share files directly with Bittorrent peers, only WebTorrent peers. We already use the same `bittorrent-dht` NPM package that WebTorrent uses, so it is straightforward to add a new `wt` object; they even use the same port, UDP for the DHT and TCP for WebTorrent. Our server is now invoked from the command line with:\n\n```\n$ server.js [torrentPort [serverPort]]\n```\n<br>with the default ports being 6881 and 6882. WebTorrent and DHT work better if the `torrentPort` is forwarded by your router, along with `serverPort`.\n\nFor the reasons discussed in part 11, it is necessary to copy the `$HOME/node_modules/webtorrent` directory to the `node_modules` directory in the directory where you keep your `server.js` file, after first installing it in the `$HOME` directory: `npm install webtorrent`.\n\nOur servers now create a torrent of the balances database and seed it. The infohash of the torrent can be stored in the DHT along with the hash of the current database and a few recent infohashes. Clients only need to retrieve the infohashes from the DHT, knowing the public key of the servers.\n\nThis scheme distributes sharing of the database among all connected clients. Since most clients will not be continuously connected, the community may operate some special clients continuously just for the purpose of reducing the load on the servers.\n\nNow that our basic design is complete, we can summarize the main design features:\n\n* There is no block chain of transactions, only a database of all account balances.\n* A small (odd) number of servers are trusted to maintain the integrity of the database.\n* A failure of a minority of the servers can be tolerated.\n* Decentralization is enhanced by the use of WebTorrent and the Mainline DHT (dynamic hash table)\n* All code is Javascript/Node.js, which is mostly platform independent and even can be run in some browsers.\n\n## Testing\n\nA new file `client.js` has been added to the repository to help with testing the WebTorrent distribution of the balances database.  It simply downloads a torrent from the WebTorrent network, specified by a hex-string infohash given on the command line:\n\n```\n$ client.js infohash\n```\n<br>The hex-string can also be a concatenation of serveral infohashes, in which case only the last (most recent) is downloaded. The current version of `server.js` logs to the console the hex-string retrieved from the DHT every minute, for each other server. Just use this hex-string as the argument to `client.js`, run in any directory, then check the downloaded balances file with the linux utility `od`.\n\n\nTo be continued...\n\n[< part 11](https://steemit.com/cryptocurrency/@metacortex/creating-a-simple-cryptocurrency-part-11)",
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