So, if any of the values are changed, the hash will no more be valid and hence the entire block will be invalid. It is generated using the values of all the other attributes of the block. And this hash is generated only once when the block is created. The hash of each block gives it a unique identity like a fingerprint. The special thing about the blockchain is that it cannot easily be tampered with. But it didn’t get much attention as timestamping documents is not as cool as bitcoins. In a cryptocurrency, the data is the details of the transaction like sender’s username, receiver’s username and amount.īlockchain was initially implemented in 1991 to timestamp digital documents, to make sure they are not backdated or tampered with. In a blockchain, each node is called a “block” and each block has an index, timestamp, hash of itself, hash of the previous block and of course the data. So, the blockchain is a slightly more complex data structure. Each node has several attributes including id, data, next node’s address etc. Most of us would have learned about linked lists in school. So basically, a blockchain is a data structure like linked lists with a growing set of nodes or blocks. But I know how the data structure works and that is what we will deal with in this blog post.Ī blockchain is a continuously growing list of records, called blocks, which are linked and secured using cryptography. I personally also don’t clearly understand how blockchain is implemented to solve actual problems. But it’s like the movie interstellar, everyone thinks its cool but no one really gets it. Blockchain is a big buzz word which is heard a lot these days.
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