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Block and chain as the word suggests a series made of blocks So we know what are these blocks Blocks can be a kind of database People who work with computers know databases perfectly And for those who do not know when we say in simple language then this database is named Collection of Data Data very little else whatever information you type on your computer that information is stored inside electronic form in the computer Similarly every facts about the Internet is a kind of data And this is a collection of data database This database is held in the computer in such a way that it can be easily searched In blocks the database is collected in groups this also group is termed blocks Each block carries a limited space or capacity to collect the database And each time a block is completely filled with all the database its automatically linked to the next block In this way one block gets that come with another block And theres a sequence This is what is termed the chain of blocks that is the blockchain What will be the elements of Blockchain There are three forms of elements in a blockchain Data held in blocks Hash Transition Hash generated from that transition HashPrevious Hash from the first block related to that block Note The first block within the blockchain is named the Genesis Block What are nodes in blockchain The computers on which blockchain details are stored They are called nodes and all sorts of the nodes which might be connected to the blockchain possess a copy from the blockchain Which updates every 10 mins With the help of these nodes it is usually found out by doing a Hash check that there has become no change in it If all the transitions inside the blockchain are licensed by the nodes thats the proof work is approved they are written in blocks With the help of nodes the data from the blockchain is stored spread and preserved A copy of every transition made inside the blockchain on each from the nodes is updated every 10ten minutes Thats why it is considered safe How does blockchain process Each block features a cryptographic hash in the previous block which can be generated on every transition made inside the blockchain Hash is often a string of numbers and letters That is Hash is a mathematical function that encrypts the input data in to the output of a limited length So whatever the size with the input data the Encrypted Unique Hash is usually of a fixed size And at the same time it really is also for this Hash produced from the previous blocks transition Why is blockchain technology considered secure If someone really wants to edit the database of the Blockchain Technology another new hash is generated Due to which the setting of all after blocks is changed and it is easy to know the location where the setting has become changed So there is noone to tamper with the information on this blockchain Now if you already know that you must make some changes in the block chain then you have to show the proof of work that is certainly for whatever changes you are going to make all of the computers Nodes coupled to the blockchain must make this change The information must be sent and just if the majority with the computers approve youll be able to change it Where can blockchain technology be used inside the future In preventing corruption Yes corruption might be prevented by making use of blockchain technology because whatever database is stored in the blockchain is copied on every nodes therefore if anyone would like to change the data then all others will know about it In maintaining government records The utilization of blockchain technology in government offices can be very secure Anyone whose name is kept in the database cannot be easily changed while selling and buying properties using Blockchain technology Due to which any disputes regarding properties should come down Patient record keeping inside the hospital If all of the information in connection with patients is kept inside the blockchain that will be correct and anyone will probably be able to hop on In virtual currency In Cryptocurrency People have previously started investing inside cryptocurrency you happen to be seeing inside online market like bitcoin ethereum dogecoin etc which currency keeps growing faster than gold One advantage of this is that it is decentralized ie no require any middleman like within the ordinary currency we use we have to use banks to transfer money in one place to another And they also charge some fees with this banks will never be needed inside transition to Cryptocurrency And you will likely be able to transact with crypto currency anywhere inside world