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Blockchain is a technology in the form of a block mathematical algorithms on the internet that functions as a general ledger system for recording decentralized transactions that are decentralized to all users in the system and secured by an irreplaceable cryptographic key.
All transactions recorded in the blockchain can be seen and managed by system users, but cannot be changed. Security systems and decentralized distributed quickly, making blockchain capable of being a cryptocurrency driving technology that is free from double-spending and third-party dependency to transact.
Cryptocurrency or digital asset is a product created from the process of mathematical and cryptographic algorithms within the blockchain technology. Cryptocurrency helps the process of financial transactions become easier, faster and safer because without going through a third party.
Exchange or more specifically at this time we talk about crypto exchange which is a platform that offers services for trading and exchanging digital currencies with fiat currencies and other currency assets.