Decentralization in Bitcoin
Problems to be solved Who maintains the ledger of transactions? Who has authority over which transactions are valid? Who creates new bitcoins? General Distributed consensusThere are n nodes that each have an input value
simple cryptography tools in blockchain
Hash Functiontakes any string as inputfixed-sized output(usually 256 bits)efficiently computable security properties:collision-freehidingpuzzle-friendly SHA-256 Hash Pointer Merkle Tree Digital signature schemeOnly you c