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Bitcoins can be bought and sold for many different currencies from individuals and from companies. The fastest way to obtain bitcoins is to purchase them in person or at a Bitcoin ATM for cash.29 Bitcoin ATMs allow bitcoins to be purchased for cash,30 and some also allow cash withdrawals from Bitcoin wallets stored on smartphones.3132 Participants in online exchanges offer bitcoin sell bids. Companies bitcoin in bulk on exchanges and offer their customers the option via ATM tor at market price.33 Using an online exchange to obtain bitcoins entails some risk, since according to one study 45% of exchanges have failed and taken client bitcoins with them.34 Since bitcoin transactions are irreversible, sellers of bitcoins must take extra measures to ensure they have received traditional funds from the buyer.Bitcoin payment processing fees are optional, and generally substantially lower than those of credit cards or money transfers.35 Walletsedit Example of Casascius physical bitcoins36
A paper wallet with QR codes Bitcoin uses public-key cryptography, in which a pair of a public and a private cryptographic key is generated.37 A collection of keys is called a wallet. Note that sometimes the term is used to mean the software in the sense of digital wallet. A Bitcoin transaction transfers ownership to a new address, a string having the form of random letters and numbers derived from public keys by application of a hash function and encoding scheme. The corresponding private keys act as a safeguard for the owner; a va home surveillance software.
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