Remember that the bitcoin exchange and the bitcoin wallet are not the same things. Bitcoin exchanges are similar to foreign exchange markets. The exchanges are digital platforms where Bitcoin is exchanged for fiat currency—for example, bitcoin (BTC) for U.S. dollars (USD). While exchanges offer wallet capabilities to users, it is not their primary business. Since wallets must be secure, exchanges do not encourage storing large amounts of bitcoin or for long periods. Therefore, it is advisable to transfer your bitcoins to a secure wallet. Because security must be your top priority when choosing a bitcoin wallet, opt for one with a multi-signature facility.
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In order to conduct transactions on the bitcoin network, participants need to run a program called a “wallet.” Bitcoin is not technically “coins,” so it only seems right that a bitcoin wallet would not actually be a wallet. Bitcoin balances are maintained using public and private “keys,” which are long strings of numbers and letters linked through the mathematical encryption algorithm used to create them.