You learned that a bitcoin transaction is a transfer of value over the Bitcoin network, is not encrypted, and can be viewed by anyone using blockchain browsers online. Transactions need to be verified by miners on the Bitcoin network, which are rewarded with bitcoins for doing this work. This is also where and how the bitcoin system creates new bitcoins. The blockchain is a distributed and decentralized database. To achieve independent verification of the chain of ownership of every bitcoin, each network computer stores its own copy of the blockchain.
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