Blockchain is a trending technology that permits the public to store digital transactions in a business market, decentralized, or centralized ledger for all the customers, with none of the central permissions. The technology is considered to be a “the money machine” and cryptocurrency is a digital currency, which is the most important by-product of the blockchain development. Bitcoin Offering (BO) is a traditional way of raising commercial funds. Newly created cryptocurrencies are being sold to the general public regularly for funding through businesspersons. The main purpose of this book chapter is to elucidate the trends by describing the blockchain technology principles and types of cryptocurrencies.