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      "body": "@@ -519,37 +519,9 @@\n rk.%0A\n-For most of the blockchain, y\n+Y\n ou j\n@@ -709,17 +709,27 @@\n a node.%0A\n-D\n+We must als\n o not co\n@@ -1282,20 +1282,39 @@\n edger. %0A\n-Runn\n+The complexity of creat\n ing a pr\n@@ -1330,27 +1330,16 @@\n ckchain \n-complexity \n depends \n@@ -2389,106 +2389,8 @@\n h ?%0A\n-A small remind for people who never used Geth. I will cover deeply geth usage in another article.%0A\n Geth\n@@ -2866,19 +2866,18 @@\n If you w\n-hic\n+is\n h to use\n@@ -6117,56 +6117,8 @@\n ode%0A\n-Remember that blockchain is a P2P kind network.%0A\n Boot\n",
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      "title": "How to mount a private blockchain with Ethereum ?",
      "body": "Hi guys,\nHere we will cover the following subject : How to mount a private blockchain ?\n\n![20180117194441-GettyImages-896355786.jpeg](https://cdn.steemitimages.com/DQma5AwYmn7GXzAKkbMbcC8o7dJSXCSUfXTeLosGKP8xcTK/20180117194441-GettyImages-896355786.jpeg)\n\n## A small remind\nAs a reminder, blockchain is also known as a distributed ledger technologies (at least for some blockchains like bitcoin and monero). It means that the same database is cloned on machines around the world, and synchronized with a P2P-like network.\nFor most of the blockchain, you just need to need to run a node and synchronize the data with the network. Most of the blockchain that are used is public : it means you can replicate the database freely and become a node.\nDo not confuse public and transparency, since some blockchains blur transactions (like blockchains running under cryptonight).\n\n## Running a private blockchain ?\nIf we turn the question, running a private blockchain means that you have control on read and/or write rights of the database. Digging more, it means that you controls nodes (who can replicate ?) and the consensus algorithm  process. For the last one, you need to choose a right one, since it is not especially worth it to choose a Proof-Of-Work  consensus algorithm in a private distributed ledger. \nRunning a private blockchain complexity depends on your choice :\n- Write from scratch your own implementation. Surely the harder way to aim that goal ^^\n- Use  an existing blockchain to create your own and have control on read/write rights. From here, we can subdivide this into :\n  - Forks an existing blockchain and re-work it. This part need to have blockchain and coding knownledge (Since most of blockchain are implemented in C++).\n  - Some blockchains give you the tools to implement your own easily, as for Ethereum.\n\nWe will see here how to create one with Ethereum. \n\n## Ethereum\n\n![ethereum](https://blockchainfrance.files.wordpress.com/2016/03/ethereumpic1.png)\n\nEthereum has appeared with a crowfunding in 2014. One of the main interesting functionnality is to deploy smart contract, a small piece of code that will be run on EVM nodes, a machine turing deterministic. \nTo mount a node, you have many implementation of the Ethereum client. The 2 most used is Parity (Rust Language) and Geth (for Go).\nI will use Geth, since it is the most used and easy to use.\n\n## How to use Geth ?\nA small remind for people who never used Geth. I will cover deeply geth usage in another article.\nGeth is relatively easy to use. you can download it here : https://geth.ethereum.org/downloads/\nYou will see a baunch of tool, but we will use only geth here.\nIf you execute geth without arguments, it will mount a node on the Main network (the production environment in other words).\nYou cannot interact with the node, it will only running it and logging messages on the console.\n```\n# Windows  Command Line - Adapt to your OS\nC:/Users/Defalt/Desktop/Geth/> ./geth.exe\n```\nIf you which to use the console, you have to pass the console argument : \n```\n# Windows  Command Line - Adapt to your OS\nC:/Users/Defalt/Desktop/Geth/> ./geth.exe console\n```\nThen from here, you can interact with the server node.\n\n## So how to mount a private blockchain ?\nFor geth advertised users, as you know, we can mount our node with the network id argument : \n```\n# Windows  Command Line - Adapt to your OS\nC:/Users/Defalt/Desktop/Geth/> ./geth.exe --help\n...\n--networkid value Network identifier (integer, 1=Frontier, 2=Morden (disused), 3=Ropsten, 4=Rinkeby) (default: 1)\n...\n```\nIn fact, creating your own blockchain is to position the networkid with an id that is not used. Think the networkid as a universe, composed by severals nodes that have set this id.\nBut this is not enough to create your own blockchain : we need to create the blockchain database, since it is a new universe.\n\n\n## How to create the database ?\nA blockchain database is chain of block, hence the name. A block contains severals transactions. A transaction represent a exchange between two parties.\nThe first block of a blockchain is named Genesis block. This block init the blockchain database, and the next block that will be mint will be added after this block, and so on. Remember that Ethereum actually use a Proof-Of-Work algorithm consensus and will swap to Proof-Of-Stake. If you are not familiar with these notions, i invite you to search more on internet. \nThankfully, Geth allows us to create easily the genesis block. \n\n### 1. Create genesis file\nCreate the directory context :\n```\n# Windows  Command Line - Adapt to your OS\nmkdir privatechain\ncd privatechain\n```\n\n### 2. Create genesis file\nCreate a new json file (like genesis.json) with the following content : \n\n```\n{\n  \"config\": {\n        \"chainId\": 2000, //  this is the network id\n        \"homesteadBlock\": 0,\n        \"eip155Block\": 0,\n        \"eip158Block\": 0\n    },\n  \"alloc\"      : {  // you can put an empty json here - alloc is used to allocate ether to an address\n      \"8cc64acb321977fe191cbc35728ee0da77989d6b\": { //The address that will receive\n          \"balance\": \"100000000000000000000000\"  //The amount in Wei\n      },\n    },\n  \"coinbase\"   : \"0x0000000000000000000000000000000000000000\",\n  \"difficulty\" : \"0x20000\",\n  \"extraData\"  : \"\",\n  \"gasLimit\"   : \"0x2fefd8\",\n  \"nonce\"      : \"0x0000000000000042\",\n  \"mixhash\"    : \"0x0000000000000000000000000000000000000000000000000000000000000000\",\n  \"parentHash\" : \"0x0000000000000000000000000000000000000000000000000000000000000000\",\n  \"timestamp\"  : \"0x00\"\n}\n```\nIf you want to know more about parameters, follow this link : \nhttps://gist.github.com/0mkara/b953cc2585b18ee098cd#file-genesis-md\n\nThen, we can create the database with the following command : \n```\ngeth --datadir=\"./ethereumdata\" init genesis.json\n```\nThis command is used everytime you mount a new node. So each node need to have the genesis file. If you want to test on the same machine mounting several nodes, change nodes ipc pipelines and ports .\n\ndatadir is the context directory that will store your database as it grows and some stuff like account private keys. By default, it use Roaming appdata user directory on Windows if you don't mention it.\n\n### 3. Setup bootnode\nRemember that blockchain is a P2P kind network.\nBootnode is used to tell for new nodes that will join the blockchain how to find the nearest node to synchronize database. It's like an auto discover tool, think it as a dns server.\nWhitout setting bootnode, we can mount the network, but everytime you will mount a new node, you need to access console and add peers manually, which can be fastidious in a big network (especially in a production environment).\n\nEvery time you launch a new node, it will have an address in order to communicate, like for example this one :\n```\n#Geth console\n> admin.nodeInfo\nenode://865655f2a55c792aa4749d00bf24431fc4b3f686948a047c1f1f3b2569b368900a462cb1658e288f513ab42a3aef74d14d1ee1bac445678aab954ed4b8a90fd8@[::]:30301\n\nNB : you can note the pattern [protocol]://[name]@[ipaddress][port]\n```\nTo create bootnode, there is a tool in the Geth suite called bootnode.exe (at least for Windows, check it out with your OS).\nWe will create firstly the key. the key is simply generating the id of the enode. When you will mount your first node, you will tell him to use this bootnode file, thus the node will always have the same enode id.\n```\nbootnode --genkey bootnode.key //Create the bootnode key\n\n```\n\nThen you can instruct to launch an new node :\n```\nbootnode --nodekey bootnode.key\nI0216 10:01:19.125600 p2p/discover/udp.go:227] Listening, enode://890b6b5367ef6072455fedbd7a24ebac239d442b18c5ab9d26f58a349dad35ee5783a0dd543e4f454fed22db9772efe28a3ed6f21e75674ef6203e47803da682@[::]:30301\n```\n\nYou will see that the enode id is the same as in the key file.\n\nYou can then tell to other nodes that you will mount which bootnodes to use : \n```\ngeth --bootnodes=\"enode://[id]@[ipaddress]:[port]\" ...\n```\n\n### 4. Mount a node\nEvery new node that will join your blockchain should init the database and then contains at least these parameters :\n```\ngeth --datadir=\"./ethereumdata\" --bootnodes=\"enode://........\" --networkid=2000\n```\n\nAdapt parameters to your respective values. you can also add others arguments. Node should connect themselves, and when you are in geth console, you can see which peers are connected with the following command :\n```\n>admin.peers\n[{\n    caps: [\"eth/61\", \"eth/62\", \"eth/63\"],\n    id: \"3f8f61999252251808972871bc810505d5b33f7de761c98810584279dce9ecabb0b7da0836978e6074f48e2b787048739c9dc1f734403c8adafc0716d16f4dcd\",\n    name: \"Geth/v1.3.5-34b622a2/linux/go1.6\",\n    network: {\n      localAddress: \"192.168.0.105:49356\",\n      remoteAddress: \"73.217.192.86:30303\"\n    },\n    protocols: {\n      eth: {\n        difficulty: 10197633442299193000,\n        head: \"8f2c1a08cfc80eff8e2aa601254d6f094e0e801b2e4f0bf2aefffaead93daa41\",\n        version: 63\n      }\n    }\n}, {\n    caps: [\"eth/61\", \"eth/62\", \"eth/63\"],\n    id: \"cae433c8f8890998f9a8694fae57e480ae1b65b40de1d0f6e823941c9d7ce1adae10c00772358e543487bf3b77a4ef9a34dd352b5ab085629df898071f42b8c6\",\n    name: \"Geth/v1.4.0-unstable/linux/go1.5.1\",\n    network: {\n      localAddress: \"192.168.0.105:49340\",\n      remoteAddress: \"122.114.96.120:30303\"\n    },\n    protocols: {\n      eth: {\n        difficulty: 10197633442299193000,\n        head: \"4269eb623e002975e9b097c936d004cdbb6fc4c0527c3ff824d257fc2c472b64\",\n        version: 63\n      }\n    }\n}]\n...\n```\n\nHope you found this useful, and don't hesitate to share your thoughts.\nApologize for my english :)",
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