As the name blockchain suggests, this is simply a chain of data blocks concatenated together. The concatenation is done using cryptographic methods. The hash—something like a checksum—of the predecessor block is included in the calculation of the current block.
As a result, manipulations in an already existing block from the past are immediately detected because all the hashes are changing across all of the blocks.
Because the blockchain is always stored separately on many thousands of computers, these manipulations would have to be done on these many thousands of computers simultaneously, which is not possible. Therefore, a public chain is a very safe way to store data.
To be active in the emerging world of cryptocurrency, you must first to understand the systems that underpin it and that will help to shape the future. It is vital ...
