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      "body": "# How to create a blockchain with javascript.\n\nA chain of blocks or also known as blockchain is a data structure in which the information is stored in sets (blocks), to which meta information is added relative to another block of the previous chain in a time line, which means that its content can only be edited by modifying all the previous blocks.\n\n> In this post we will learn how to create a blockchain with javascript and nodejs.\n\n1.- We will create a folder with the name of our choice in this case we will call it \"blockchain\", inside it we will create a file that will be called main.js.\n\n2.- Now we will open this folder with the code editor of our preference.\n\n## Well now let's start with the code !!\n\n1.- First we will create a class called Block which will contain a constructor function, we will also create the functions calculateHash, mineBlock, the constructor function will create the instances of the objects of the block and will provide them with their properties.\n\n```javascript\nclass Block {\n    constructor(data) {\n        this.index = 0;\n        this.date = new Date();\n        this.data = data;\n        this.previousHash = \"0\";\n        this.hash = this.calculateHash();\n        this.nonce = 0;\n    }\n\n    calculateHash() {\n\t\n    }\n\n    mineBlock(difficulty) {\n\t\n}\n```\n\n2.- We start npm, open the terminal and we are located in our project, now we will only execute the following command and it only remains to configure the project to our liking.\n\n```\n$ npm init\n```\n\n3.- Now we are using a npm module called crypto-js, this can be installed with the following command.\n\n```\n$ npm install –save crypto-js\n```\n\n4.- Now that the library is installed we will create a constant called SHA265 that requires crypto-js / sha265, this we will use to create the calculation function.\n\n```javascript\nconst SHA256 = require('crypto-js/sha256');\n\nclass Block {\n    constructor(data) {\n        this.index = 0;\n        this.date = new Date();\n        this.data = data;\n        this.previousHash = \"0\";\n        this.hash = this.calculateHash();\n        this.nonce = 0;\n    }\n\n    calculateHash() {\n        return SHA256(this.index + this.previousHash + this.date + this.data + this.nonce).toString();\n    }\n\n    mineBlock(difficulty) {\n    \twhile(!this.hash.startsWith(difficulty)) {\n    \t\tthis.nonce++;\n    \t\tthis.hash = this.calculateHash();\n    \t}\n    }\n}\n```\n\n  - The function calculateHash we will use to give each block its own hash, it takes each piece of the Block object, throws it in a SHA256 function and converts it to a string.\n\n  - The second mineBlock function will be used to safely process transactions in blockchain networks adding difficulty to the process of generating the hash, in this case the difficulty will be the number of zeros with which the hash will begin.\n\n5.- Now that we create the structure of our individual block, we need to create a structure an object of class Blockchain this will have the following functions, constructor, createGenesis, latestBlock, addBlock, checkValid.\n\n  - Our Blockchain class needs to have the capacity to create instances, to initiate, access the most recent information of the block and expand by adding a new block.\n\n```javascript\nclass Blockchain {\n\tconstructor(difficulty = '00') {\n\t\tthis.chain = [this.createGenesis()];\n\t\tthis.difficulty = difficulty;\n\t}\n\n\tcreateGenesis() {\n\t\treturn new Block(0, {amount: 100});\n\t}\n\n\tlatestBlock() {\n\t\treturn this.chain[this.chain.length - 1];\n\t}\n\n\taddBlock(newBlock) {\n\t\tnewBlock.index = this.latestBlock().index + 1;\n\t\tnewBlock.previousHash = this.latestBlock().hash;\n\t\tnewBlock.hash = newBlock.calculateHash();\n\t\tnewBlock.mineBlock(this.difficulty);\n\t\tconsole.log('Mined! '+ newBlock.hash+' with nonce'+ newBlock.nonce);\n\t\tthis.chain.push(newBlock);\n\t}\n\n\tcheckValid() {\n\t\tfor (let i = 1; i < this.chain.length; i++) {\n\t\t\tconst currentBlock = this.chain[i];\n\t\t\tconst previousBlock = this.chain[i - 1];\n\n\t\t\tif (currentBlock.hash !== currentBlock.calculateHash()) {\n\t\t\t\treturn false;\n\t\t\t}\n\n\t\t\tif (currentBlock.previousHash !== previousBlock.hash) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\t\treturn true;\n\t}\n}\n```\n\n6.- Well let's explain what we did in this code.\n\n### Constructor function.\n\nThis function creates an instance in our chain of blocks with a property in a list structure, that is why our Block object has indexes this property is used to find its position in our list of chains, it also defines the difficulty of initial mining.\n\n### CreateGenesis function.\n\nOur block chain needs the createGenesis function since it creates the first block of our chain. Usually in blockchain the first block of any is known as \"Genesis block\", that is why the name of createGenesis, normally the information of the genesis block is entered manually. Since it is the first block of the chain, its index will be 0, the date and time will be the current ones, as far as the previous hash will be 0 since there is no other hash that does it.\n\n### LatestBlock function.\n\nThis function obtains the information of the most recent block and will also be necessary in the following function.\n\n### AddBlock function.\n\nIn order for our block to have the capacity to extend continuously, it needs this function, the block chains have this functionality, the best known is Bitcoin (BTC), which is responsible for creating new blocks every 10 minutes with the information of the transactions made in It is time frame.\nIts implementation of the addBlock function is simple, it takes the Block object as an input which has a timestamp and data. Then, our addBlock function will use the latestBlock function to give it an index and a hash before our new block, after that we give it its own hash using the function calculateHash, we will also pass the difficulty of mining defined in the property difficulty, and finally we push this block in our chain, now we have a new block.\n\n### CheckValid function.\n\nThis function verifies the integrity of the block chain and detects if something has been tampered with.\nYou should know that the hashes are critical to detect changes in our chain since even the smallest change in an object will result in a completely different hash, so this function uses a for loop to traverse the string and try to match its hashes to detect changes.\nThere are 2 parts in our loop the first is to match currentBlock.hash with currentBlock.calculateHash and the second is to match currentBlock.previousHash with previousBlock.hash, the first one is used to check if the currentBlock information has been manipulated without updating currentBlock. hash The second is used to verify if a previous block has been modified.\n\n7.- Finally we will add these lines at the end of our code that add two blocks with data, validate them and show them in the console.\n\n  - Note: Blockchain class receives the difficulty of mining in this case the difficulty is 3 zeros, the more zeros more difficult will be the mining of the blocks.\n\n**Be careful not to add many zeros or your equipment could stop!**\n\n```javascript\nlet myCoin = new Blockchain('000');\nmyCoin.addBlock(new Block({amount: 50}));\nmyCoin.addBlock(new Block({amount: 25}));\n\nconsole.log(\"The block chain is valid?\", myCoin.checkValid());\n```\n\n8.- Now our final code will look like this.\n\n```javascript\nconst SHA256 = require('crypto-js/sha256');\n\nclass Block {\n    constructor(data) {\n        this.index = 0;\n        this.date = new Date();\n        this.data = data;\n        this.previousHash = \"0\";\n        this.hash = this.calculateHash();\n        this.nonce = 0;\n    }\n\n    calculateHash() {\n        return SHA256(this.index + this.previousHash + this.date + this.data + this.nonce).toString();\n    }\n\n    mineBlock(difficulty) {\n    \twhile(!this.hash.startsWith(difficulty)) {\n    \t\tthis.nonce++;\n    \t\tthis.hash = this.calculateHash();\n    \t}\n    }\n}\n\nclass Blockchain {\n\tconstructor(difficulty = '00') {\n\t\tthis.chain = [this.createGenesis()];\n\t\tthis.difficulty = difficulty;\n\t}\n\n\tcreateGenesis() {\n\t\treturn new Block(0, {amount: 100});\n\t}\n\n\tlatestBlock() {\n\t\treturn this.chain[this.chain.length - 1];\n\t}\n\n\taddBlock(newBlock) {\n\t\tnewBlock.index = this.latestBlock().index + 1;\n\t\tnewBlock.previousHash = this.latestBlock().hash;\n\t\tnewBlock.hash = newBlock.calculateHash();\n\t\tnewBlock.mineBlock(this.difficulty);\n\t\tconsole.log('Mined! '+ newBlock.hash+' with nonce '+ newBlock.nonce);\n\t\tthis.chain.push(newBlock);\n\t}\n\n\tcheckValid() {\n\t\tfor (let i = 1; i < this.chain.length; i++) {\n\t\t\tconst currentBlock = this.chain[i];\n\t\t\tconst previousBlock = this.chain[i - 1];\n\n\t\t\tif (currentBlock.hash !== currentBlock.calculateHash()) {\n\t\t\t\treturn false;\n\t\t\t}\n\n\t\t\tif (currentBlock.previousHash !== previousBlock.hash) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\t\treturn true;\n\t}\n}\n\nlet myCoin = new Blockchain('0000');\nmyCoin.addBlock(new Block({amount: 50}));\nmyCoin.addBlock(new Block({amount: 25}));\n\nconsole.log(\"The block chain is valid?\", myCoin.checkValid());\n```\n\n9.- Now we just have to try our blockchain open the terminal, locate yourself at the root of your project and execute the following command.\n\n```\n$ node main.js\n```\n\n10.- You will see something like this.\n\n```\nMined! 00000e0d4ead0b3bf31acc6af0b09ead1924442ae26b0ba7e7d6900176eec17e with nonce 24943\nMined! 0000d038ac586662b838055f1b6687b6d213fa1dd78fee947be5184b6853920e with nonce 44157\nThe block chain is valid? True\n```\n\n11.- To see the information contained in each block, add the following line of code at the end.\n\n```javascript\nconsole.log(JSON.stringify(myCoin, null, 4));\n```\n\n12.- Now you should see something like this.\n\n```\nMined! 0000f66f662e39a11b318ba7cf2667615a19fed11384c6a09c7d52a44f47a07d with nonce 89368\nMined! 0000be061e6026fff3471a18627d033cdd969c1f16e99f59ac6957e616d1905f with nonce 159427\nThe block chain is valid? true\n{\n    \"chain\": [\n        {\n            \"index\": 0,\n            \"date\": \"2018-10-18T23:26:40.639Z\",\n            \"data\": 0,\n            \"previousHash\": \"0\",\n            \"hash\": \"660ea1d34ab625219001fcc5c698acf9d1208f73d1dba7272e89ec8ebcf3e019\",\n            \"nonce\": 0\n        },\n        {\n            \"index\": 1,\n            \"date\": \"2018-10-18T23:26:40.643Z\",\n            \"data\": {\n                \"amount\": 50\n            },\n            \"previousHash\": \"660ea1d34ab625219001fcc5c698acf9d1208f73d1dba7272e89ec8ebcf3e019\",\n            \"hash\": \"0000f66f662e39a11b318ba7cf2667615a19fed11384c6a09c7d52a44f47a07d\",\n            \"nonce\": 89368\n        },\n        {\n            \"index\": 2,\n            \"date\": \"2018-10-18T23:26:49.377Z\",\n            \"data\": {\n                \"amount\": 25\n            },\n            \"previousHash\": \"0000f66f662e39a11b318ba7cf2667615a19fed11384c6a09c7d52a44f47a07d\",\n            \"hash\": \"0000be061e6026fff3471a18627d033cdd969c1f16e99f59ac6957e616d1905f\",\n            \"nonce\": 159427\n        }\n    ],\n    \"difficulty\": \"0000\"\n}\n```\n\nReady now you have already created a chain of blocks (Blockchain) in javascript and nodejs, in future post we will learn more about blockchain and javascript.\n\nThe code repository: [GitHub](https://github.com/Stricker66/My-Blockchain)",
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      "title": "Como crear un Blockchain con JavaScript y NodeJS.",
      "body": "# Como crear un Blockchain con JavaScript y NodeJS.\n\n![Bitcoin](https://images.unsplash.com/photo-1518546305927-5a555bb7020d?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=20505ab3ec40e93846c7f4340f92ab99&dpr=1&auto=format&fit=crop&w=1000&q=80&cs=tinysrgb)\n\nUna cadena de bloques o también conocida como blockchain es una estructura de datos en la que la información se guarda en conjuntos (bloques), a los que se ánade meta informaciones relativas a otro bloque de la cadena anterior en una linea temporal, lo que significa que su contenido solo puede ser editado modificando todos los bloques anteriores.\n\n> En este post aprenderemos como crear un blockchain con javascript y nodejs.\n\n1. Crearemos una carpeta con el nombre de nuestra elección en este caso la llamaremos “blockchain” , dentro de ella crearemos un archivo que se llamara main.js.\n\n2. Ahora abriremos esta carpeta con el editor de código de nuestra preferencia.\n\n### Bien ahora empecemos con el código!!\n<br>\n\n1.- Primero crearemos una clase llamada Block el cual contendrá una función constructor, también crearemos las funciones calculateHash, mineBlock, la función constructor creara las instancias de los objetos del bloque y les proporcionara sus propiedades.\n\n``` javascript\nclass Block {\n    constructor(data) {\n        this.index = 0;\n        this.date = new Date();\n        this.data = data;\n        this.previousHash = \"0\";\n        this.hash = this.calculateHash();\n        this.nonce = 0;\n    }\n\n    calculateHash() {\n\t\n    }\n\n    mineBlock(difficulty) {\n\t\n}\n```\n<br>\n\n2.- Iniciaremos npm, abriremos el terminal y nos ubicamos en nuestro proyecto ahora solo ejecutaremos en siguiente comando y solo resta configurar el proyecto a nuestro gusto.\n\n`npm init`\n\n3.-  Ahora aremos uso de un modulo de npm llamado crypto-js, este puede ser instalado con el siguiente comando.\n\n`npm install –save crypto-js`\n\n4.-  Ahora que la biblioteca esta instalada crearemos una constante llamada SHA265 que requiere de crypto-js/sha265, esto lo usaremos para crear la función de calculo.\n\n```javascript\nconst SHA256 = require('crypto-js/sha256');\n\nclass Block {\n    constructor(data) {\n        this.index = 0;\n        this.date = new Date();\n        this.data = data;\n        this.previousHash = \"0\";\n        this.hash = this.calculateHash();\n        this.nonce = 0;\n    }\n\n    calculateHash() {\n        return SHA256(this.index + this.previousHash + this.date + this.data + this.nonce).toString();\n    }\n\n    mineBlock(difficulty) {\n    \twhile(!this.hash.startsWith(difficulty)) {\n    \t\tthis.nonce++;\n    \t\tthis.hash = this.calculateHash();\n    \t}\n    }\n}\n```\n<br>\n\n  - La función calculateHash la usaremos para dar a cada bloque su propio hash, este toma cada pieza del objeto Block, lo lanza en una función SHA256 y lo convierte a una cadena.\n\n  - La segunda función mineBlock sera usada para procesar con seguridad las transacciones en redes blockchain agregando dificultad al proceso de generado del hash, en este caso la dificulta sera el numero de ceros con el cual comenzara el hash.\n\n5.- Ahora que creamos la estructura de nuestro bloque individual, necesitamos crear una estructura un objeto de clase Blockchain esta tendrá las siguientes funciones, constructor, createGenesis, latestBlock, addBlock, checkValid.\n\n  - Nuestra clase Blockchain necesita tener la capacidad de crear instancias, de iniciar, acceder a la información mas reciente del bloque y ampliarse agregando un nuevo bloque.\n\n```javascript\nclass Blockchain {\n\tconstructor(difficulty = '00') {\n\t\tthis.chain = [this.createGenesis()];\n\t\tthis.difficulty = difficulty;\n\t}\n\n\tcreateGenesis() {\n\t\treturn new Block(0, {amount: 100});\n\t}\n\n\tlatestBlock() {\n\t\treturn this.chain[this.chain.length - 1];\n\t}\n\n\taddBlock(newBlock) {\n\t\tnewBlock.index = this.latestBlock().index + 1;\n\t\tnewBlock.previousHash = this.latestBlock().hash;\n\t\tnewBlock.hash = newBlock.calculateHash();\n\t\tnewBlock.mineBlock(this.difficulty);\n\t\tconsole.log('Minado!! '+ newBlock.hash+' con nonce '+ newBlock.nonce);\n\t\tthis.chain.push(newBlock);\n\t}\n\n\tcheckValid() {\n\t\tfor (let i = 1; i < this.chain.length; i++) {\n\t\t\tconst currentBlock = this.chain[i];\n\t\t\tconst previousBlock = this.chain[i - 1];\n\n\t\t\tif (currentBlock.hash !== currentBlock.calculateHash()) {\n\t\t\t\treturn false;\n\t\t\t}\n\n\t\t\tif (currentBlock.previousHash !== previousBlock.hash) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\t\treturn true;\n\t}\n}\n```\n<br>\n**Bien expliquemos que hicimos en este código.**\n\n- Función Constructor.\n\n  - Esta función crea una instancia en nuestra cadena de bloques con una propiedad en una estructura de lista, por eso nuestro objeto Block tiene índices esta propiedad se utiliza para encontrar su posición en nuestra lista de cadenas, además define la dificultad de minado inicial.\n<br>\n- Función createGenesis.\n\n  - Nuestra cadena de bloques necesita la función createGenesis ya que esta crea el primer bloque de nuestra cadena. Por lo general en blockchain el primer bloque de cualquier se conoce como “Bloque de Génesis” , por eso el nombre de createGenesis, normalmente la información del bloque génesis es introducido manualmente. Como es el primer bloque de la cadena su índice sera 0, la fecha y hora serán los actuales, en cuanto al hash anterior sera 0 ya que no hay otro hash que lo proceda.\n<br>\n- Función  latestBlock.\n\n  - Esta función obtiene la información del bloque mas reciente y también sera necesaria en la siguiente función.\n<br>\n- Función addBlock. \n\n  - Para que nuestro bloque tenga la capacidad de extenderse continuamente necesita esta función, las cadenas de bloque tienen esta funcionalidad, la mas conocida es la del Bitcoin (BTC) esta se encarga de  crear bloques nuevos cada 10 minutos con la información de las transacciones realizadas en se marco de tiempo.\nSu implementación de la función addBlock es sencilla esta toma el objeto Block como una entrada la cual posee una marca de tiempo y datos. Luego, nuestra función addBlock usara la función latestBlock para darla un índice y un hash anterior a nuestro nuevo bloque, después de eso le damos su propio hash usando la función calculateHash, también pasaremos la dificulta de minado definida en la propiedad difficulty, y finalmente empujamos este bloque en nuestra cadena, ahora tenemos un nuevo bloque.\n<br>\n- Función  checkValid.\n\n  - Esta función verifica la integridad de la cadena de bloques y detecta si algo ha sido manipulado.\nDebes saber que los hashes son críticos para detectar cambios en nuestra cadena ya que incluso el cambio mas pequeño en un objeto resultara en un hash completamente diferente, por lo tanto esta función usa un bucle for para recorrer la cadena e intentar coincidir sus hashes para detectar cambios.\nHay 2 partes en nuestro bucle la primera es hacer coincidir currentBlock.hash con currentBlock.calculateHash y la segundo es hacer coincidir currentBlock.previousHash con previousBlock.hash, el primero se usa para verificar si la información de currentBlock ha sido manipulada sin actualizar currentBlock.hash. El segundo se usa para verificar si un bloque anterior ha sido modificado.\n\n6.- Finalmente agregaremos esta lineas al final de nuestro código que añaden dos bloques con datos, los validara y mostraran en consola.\n\n```javascript\nlet myCoin = new Blockchain('000');\nmyCoin.addBlock(new Block({amount: 50}));\nmyCoin.addBlock(new Block({amount: 25}));\n\nconsole.log(\"La cadena de bloques es valida?\", myCoin.checkValid());\n```\n<br>\n**Nota: La clase Blockchain recibe la dificulta de minado en este caso la dificulta son 3 ceros, entre mas ceros mas difícil sera el minado de los bloques.**\n\n7.- Ahora nuestro código final se vera así.\n\n```javascript\nconst SHA256 = require('crypto-js/sha256');\n\nclass Block {\n    constructor(data) {\n        this.index = 0;\n        this.date = new Date();\n        this.data = data;\n        this.previousHash = \"0\";\n        this.hash = this.calculateHash();\n        this.nonce = 0;\n    }\n\n    calculateHash() {\n        return SHA256(this.index + this.previousHash + this.date + this.data + this.nonce).toString();\n    }\n\n    mineBlock(difficulty) {\n    \twhile(!this.hash.startsWith(difficulty)) {\n    \t\tthis.nonce++;\n    \t\tthis.hash = this.calculateHash();\n    \t}\n    }\n}\n\nclass Blockchain {\n\tconstructor(difficulty = '00') {\n\t\tthis.chain = [this.createGenesis()];\n\t\tthis.difficulty = difficulty;\n\t}\n\n\tcreateGenesis() {\n\t\treturn new Block(0, {amount: 100});\n\t}\n\n\tlatestBlock() {\n\t\treturn this.chain[this.chain.length - 1];\n\t}\n\n\taddBlock(newBlock) {\n\t\tnewBlock.index = this.latestBlock().index + 1;\n\t\tnewBlock.previousHash = this.latestBlock().hash;\n\t\tnewBlock.hash = newBlock.calculateHash();\n\t\tnewBlock.mineBlock(this.difficulty);\n\t\tconsole.log('Minado!! '+ newBlock.hash+' con nonce '+ newBlock.nonce);\n\t\tthis.chain.push(newBlock);\n\t}\n\n\tcheckValid() {\n\t\tfor (let i = 1; i < this.chain.length; i++) {\n\t\t\tconst currentBlock = this.chain[i];\n\t\t\tconst previousBlock = this.chain[i - 1];\n\n\t\t\tif (currentBlock.hash !== currentBlock.calculateHash()) {\n\t\t\t\treturn false;\n\t\t\t}\n\n\t\t\tif (currentBlock.previousHash !== previousBlock.hash) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\t\treturn true;\n\t}\n}\n\nlet myCoin = new Blockchain('0000');\nmyCoin.addBlock(new Block({amount: 50}));\nmyCoin.addBlock(new Block({amount: 25}));\n\nconsole.log(\"La cadena de bloques es valida?\", myCoin.checkValid());\n```\n<br>\n8.- Ahora solo queda probar nuestro blockchain abre el terminal, ubícate en la raíz de tu proyecto y ejecuta el siguiente comando.\n\n```node main.js```\n<br>\n9.- Veras algo como esto.\n\n```\nMinado!! 000020f23e31c8f28fb54adb6754edd4319cb74065663acce78981630077028e con nonce 130611\nMinado!! 000052c92a3c0533f6379bbca7f3096a4aa5cba6b7280761f983284a5680ca8f con nonce 23024\nLa cadena de bloques es valida? true \n```\n<br>\n10.- Para ver la informacion que contiene cada bloque agrega al final la siguiente linea de código.\n\n```javascript\nconsole.log(JSON.stringify(myCoin, null, 4));\n```\n<br>\n- Ahora deberías ver algo como esto.\n\n```javascript\nMinado!! 000004d09ad97f858e05c4b101fce77ae3670f908f820dca5fa5d882f3e284d7 con nonce 63331\nMinado!! 0000b78e1ea385c3d39f83b4d4bf22f53fd675e8b21a4a33afb4ba0d799d34af con nonce 9669\nLa cadena de bloques es valida? true\n{\n    \"chain\": [\n        {\n            \"index\": 0,\n            \"date\": \"2018-10-16T23:41:01.033Z\",\n            \"data\": 0,\n            \"previousHash\": \"0\",\n            \"hash\": \"3b2403dfac8d26ae556adb59f97b6f925d41687e3c436b0d70e09d99d31bf733\",\n            \"nonce\": 0\n        },\n        {\n            \"index\": 1,\n            \"date\": \"2018-10-16T23:41:01.038Z\",\n            \"data\": {\n                \"amount\": 50\n            },\n            \"previousHash\": \"3b2403dfac8d26ae556adb59f97b6f925d41687e3c436b0d70e09d99d31bf733\",\n            \"hash\": \"000004d09ad97f858e05c4b101fce77ae3670f908f820dca5fa5d882f3e284d7\",\n            \"nonce\": 63331\n        },\n        {\n            \"index\": 2,\n            \"date\": \"2018-10-16T23:41:07.385Z\",\n            \"data\": {\n                \"amount\": 25\n            },\n            \"previousHash\": \"000004d09ad97f858e05c4b101fce77ae3670f908f820dca5fa5d882f3e284d7\",\n            \"hash\": \"0000b78e1ea385c3d39f83b4d4bf22f53fd675e8b21a4a33afb4ba0d799d34af\",\n            \"nonce\": 9669\n        }\n    ],\n    \"difficulty\": \"0000\"\n}\n```\n<br>\n**Listo ahora ya has creado una cadena de bloques (Blockchain) en javascript y nodejs, en futuros post aprenderemos mas sobre blockchain y javascript.**\n\nEl repositorio de todo el código: [GitHub](https://github.com/Stricker66/My-Blockchain)",
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