The Blockchains Technologies for Cryptocurrencies: A Review

A blockchain is a decentralized architecture that most cryptocurrencies rely on duplicating and distributing a digital ledger of transactions across a peer-to-peer network with built in security to increase the trust and integrity of the transactions. Due the benefits of this technology, we review Recently published papers to explain its main types (public, private, hybrid) and extract the main characteristics of each one separately to know what is the suitable type depended on environment conditions and predefined requirements. and review of the popular cryptocurrencies working environments, which are generally considered one of the basic applications depended on the blockchain.