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      "body": "Congratulations @holaqtal! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@holaqtal/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/@holaqtal) and compare to others on the [Steem Ranking](https://steemitboard.com/ranking/index.php?name=holaqtal)_</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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      "body": "Gracias!",
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      "body": "Como es obvio, por el nombre sabemos que es una cadena de bloques.\nPero, ¿qué tipo de cadena de bloques? Bueno, esta cadena de bloques contiene información.\nOriginalmente, blockchain se creó para marcar el tiempo de los documentos digitales en otro momento para no retrocederlos o manipularlos.\nBlockchain se hizo muy popular, cuando Satochi Nakamoto lo adaptó para crear una criptomoneda digital llamada Bitcoin, en 2009.\nAhora bien, una cadena de bloques no está corrompida (es muy difícil de modificar una vez que los datos se han grabado dentro de la cadena de bloques) y se distribuye l (está abierta para cualquiera)\n\nEstructura de un bloque\nCada bloque contiene: datos almacenados, hash del bloque real y el hash del bloque anterior\n\n![](https://cdn.steemitimages.com/DQmU2ruHouHabqkZC6F8rZUN6ABeDNbAnniseFD7r7Wotc9/image.png)\n\nLos datos almacenados: estos datos podrían tener detalles sobre transacciones, contratos, notarios, registros médicos, lo que sea. Eso depende del tipo de blockchain\n\nHash: el hash es en realidad una función computable que funciona a través de un algoritmo que, como entrada, tiene un conjunto de elementos, que generalmente son cadenas y luego los convierte\nen un rango finito de salidas, normalmente cadenas de longitud fija. La idea básica de un valor hash es que nos da un resultado con una representación compacta de la cadena.\nEl hash se calcula cuando se crea el bloque. \nEl hash identifica un bloque y todo su contenido y este hash siempre será único, por esta razón, es posible decir que un hash es como la huella dactilar de la cadena. Cada vez que se realiza un cambio dentro del bloque; El hash también cambia. Y esta es la gran utilidad del hash, gracias a él, podemos detectar cambios en el bloque.\n\nEl hash del bloque anterior: Primero que nada, como podemos imaginar, la cadena de bloques comienza en cierto punto. Asi pues, el bloque con el que se comienza se llama bloque Genesis, que tiene su propio hash. Naturalmente, este bloque no tiene hash previo (por ser el primer bloque)\nLos siguientes bloques tendrán su propio hash y el hash del bloque anterior.\n\nPreviniendo la manipulación\n\nComo se dijo antes, los bloques heredarán el hash del bloque anterior. Por lo tanto, esa es una forma de prevenir la manipulación\nPero, ¿y si algo se modifica en un bloque terminado?\nEl hash también se modifica.\n¡Observe! El hash del siguiente bloque no coincide con el hash de mi bloque modificado.\n\n![](https://cdn.steemitimages.com/DQmWZJXyB8iF4oDTvk6sx7os1nF1besaMdQ6D7GvPQwkaEf/image.png)\n\nPor lo tanto, el cambio de un solo bloque hará que todos los siguientes bloques no sean válidos, pero las computadoras pueden volver a calcular el hash de los siguientes bloques de manera rápida y fácil para hacer que el blockchain sea válido nuevamente.\nHouston, tenemos un problema! Si es así, la incorruptibilidad se vería afectada. Cualquiera podría inventar datos falsos, cualquiera podría usar computadoras para recalcular nuevos hashes, ¡oh no, esto es un caos!\nEntonces blockchain ya no estaría seguro.\n\nNo se preocupe, ya que usar hashes no es suficiente, Blockchain usa un mecanismo llamado: PRUEBA DE TRABAJO. (PROOF OF WORK)\n\nLa prueba de trabajo ralentiza la creación de nuevos bloques, tomando un  cierto tiempo para calcular la prueba de trabajo y luego agregar un nuevo bloque a la cadena. Esto se hace para dificultar la manipulación de bloques. porque si se manipula un bloque, será necesario volver a calcular la prueba de trabajo para el bloque y los bloques siguientes. Y como esto lleva tiempo, la red p2p puede detectar que algo no está bien.\n\nQué alivio, la afirmación de que blockchain es incorruptible es respalda gracias a el hash más PROOF OF WORK.\n\nPero eso no es todo, recuerde que acabo de mencionar arriba la red p2p  y, al principio, también se dijo que  blockchain es distribuida, que es otra forma en que Blockchain se asegura\nEsto se hace mediante el uso de una red Peer to Peer (de igual a igual) , lo que significa que cualquier persona puede unirse a la red y la persona que se une a la red obtiene la copia completa de la cadena de bloques.\nCuando se crea un nuevo bloque, este se envía a todos los miembros de la red. \nCada persona o nodo  verifica el bloque para verificar que no haya sido manipulado. Un Nodo , viene siendo como un contador publico, un gestor ellos poseen y verifican todas las transacciones realizadas desde el comienzo de la moneda.\nPara validar los bloques, todos los nodos aceptan si un bloque es válido o no. Esto lo realizan a través de lo que se denomina consenso\nAquellos bloques que se consideran manipulados son rechazados por otros nodos en la red y los que se dan por buenos son agregados a la blockchain.\n\n![](https://cdn.steemitimages.com/DQmV5F97xn6KYZmMFqAR6wZbqms3KvPFJp4YjKAgYTcF79g/image.png)\n\nEn consecuencia, para manipular una cadena de bloques, tendrá que pasar por la molestia de alterar todos los bloques de la cadena, volver a hacer la prueba de trabajo. Además, toma el control de más de la mitad de la red P2P. En otras palabras, será casi imposible hacer tal cosa.\n\nEn conclusión, la seguridad y la incorruptibilidad son gracias al uso inteligente de hashing, el mecanismo de prueba de trabajo y el uso de nodos con protocolo P2P.",
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      "body": "What's blockchain technology?\n\nAs it's obvious, from the name we know that it's a chain of blocks. \nBut, what type of chain of blocks? Well, this chain of blocks contains information. \nOriginally blockchain was created to time-stamp digital documents in orther to not backdate them or to tamper with them.\nBlockchain became very popular, when Satochi Nakamoto adapted it to create a digital Cryptocurrency called Bitcoin, in 2009.\nNow, a blockchain is a  uncorrupted  (very difficult to modify once the data has been recorded inside the blockchain) and is distributed l (it's open for anybody)\n\nStructure of a block\nEach block contains: stored data, hash of the actual block and the hash of the previous block.\n\n![](https://cdn.steemitimages.com/DQmU2ruHouHabqkZC6F8rZUN6ABeDNbAnniseFD7r7Wotc9/image.png)\n\nThe stored data: this data could have details about transactions, contracts, notary,medical records, you name it. That depends on the type of blockchain\n\nHash:  The hash is actually a computable function that works through an algorithm which as input has a set of elements, that are usually chains and then it converts them\nin a finite range of outputs, normally chains of fixed length. The basic idea of a hash value is that it gives us an output with a compact representation of the chain. \nThe hash is calculated when the block is created. The hash identifies a block and all of its content and this hash will be always unique, for this reason,is possible to say that a hash is  like  the finger print of the chain.\nEvery time a change is done inside the block ; The hash also change. And this is the great utility of the hash, thanks to it, we can detect changes in the block.\n\nThe hash of the previous block: First of all, as we can imagine the blockchain starts in a certain point. Well, the block that's starting is called the genesis block, which has its own hash. Naturally this block has none previous hash (by cause of being the first block)\nThe following blocks will have their own hash and the hash of the previous block.\n\nPreventing Tampering\n\nAs it's been said before blocks will inherit the hash of the previous block. Thus, that's a way of preventing tampering\nBut, what if something is modified in a finished block? \nThe hash is modified as well.\nObserve! The hash of the next block doesn't match with the hash of my modified block. \n\n![](https://cdn.steemitimages.com/DQmWZJXyB8iF4oDTvk6sx7os1nF1besaMdQ6D7GvPQwkaEf/image.png)\n\nThus, Changing a single block will make all following blocks invalid, but computers can recalculate the hash of the following blocks fast and easy to make the blockchain valid again.  \nHouston, we have a problem. If so, the incorruptibility would be affected!! Anybody could make up false data, anybody could use computers to recalculate new hashes, oh no, this is chaos!!!\nThen blockchain it wouldn't be any longer secure. \n\nDon't worry, since using hashes is not enough, Blockchain uses a mechanism called:  PROOF OF WORK.\n\nProof of work slows down the creation of new blocks, taking some time to calculate the proof of work and then adding a new block to the chain. This is done in order to make it hard to tamper with blocks. because if a block is tampered with,  it will be needed to recalculate the proof of work for the actual block and  following blocks. And since this takes time, the p2p network can detect that something is not right. \n\nWhat a relief , the statement of blockchain being uncorrupted is supported thanks to the hash plus the proof of work. \n\nBut that's not all, remember I just mention above p2p network and at the beginning it was also said that blockchain is distributed, which is another way that blockchain secure itself\nThis is done by using a peer to peer network, which means that anyone can join the network. The person who joins the network gets the full copy of the blockchain.\nWhen a new block is created, this is sent to everybody of the network. Each node then verifies the block to check that is hasn't been tampered with. So a Node is that Ledger, that contains all transactions done from the beginning of the currency. \nTo validate the blocks all the nodes agree if a block is valid or not through what is called consensus\nThose blocks that are considered to be tampered with are rejected by other nodes in the network\n\n![](https://cdn.steemitimages.com/DQmV5F97xn6KYZmMFqAR6wZbqms3KvPFJp4YjKAgYTcF79g/image.png)\n\nConsequently, to manipulate a blockchain you will have to through the hassel of tamper all the blocks in the chain, do again the proof of work. Plus take control of more than half of the P2P network. In other words it will be almost impossible to do such a thing.\n\nIn conclusion the security and incorruptibility are thanks to the smart use of hashing, the proof of work mechanism and the use of nodes with P2P protocol.",
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