Why is it difficult to modify records in a blockchain

Blockchain works in a peer to peer network and every new transaction is broadcast to all the nodes so that any one of the nodes could mine it. The process of mining a block involves predicting a nonce value that could satisfy the difficulty level. Read more

Creating a simple Blockchain

A blockchain, originally block chain, is a continuously growing list of records, called blocks, which are linked and secured using cryptography. Read more