Block Chain

Hashing is key to BlockChain as it generates a unique number for the content in question.
One you have know hash of any text/file you can verify whether content has changed or not, because slightest of change will change the hash and hash generated for verification will not match with hash of original content. 

 After stipulated time all the transaction recorded will be converted into a block which will contain transaction and hash of the transaction . Hence if someone tries to change any transaction hashkey will not match.

First created block is called Genesis block which will not have address to previous block, anyblock created after first block will point to block after/before block and all blocks backward lead to genesis block.
 Centralised ledger is notion for centralised database/controlling authority, in this practice if controlling authority goes out of business everyone suffers, also issuing authority can do frauds as no one verifies what they are doing. Centralised authority charges their client for operation.




Block chain is example of decentralised operation where every node will have all the transaction but no one can change it, also every transaction is verified by all nodes leading to less chances of frauds and hacking.

 Use Case Of Block Chain




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