Foundations of Blockchain

Characteristics of blockchain

A blockchain, put simply, is a chain of blocks that are secured to each other via cryptography. Cryptography hash pointers are used as references to link each block in the blockchain of the public ledger. Although this sounds very secure since no intruder would be able to break the blockchain and insert their own versions of the blocks, it's not completely secure. Since the ledger is entirely transparent and public, any node could insert their block to reproduce the entire blockchain and create their own version of it. Eventually, they could later propagate the block to every node in the network and prove that their blockchain is the legitimate one. This shows that immutability cannot be achieved just by connecting ...