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The modern bi-fold wallet with multiple “card slots” became standardized in the early with the introduction of the first credit cards. Some innovations include the introduction of the velcro-closure wallet in the Pocket-sized wallets remain extremely popular to this day.

For cryptocurrencies that only exist in cyberspace as entries in some online ledger a “cryptocurrency wallet” is a computing tool whose purpose is to securely keep the owners secret key, authenticate the owner, and let the owner sign transactions securely. A “hardware wallet” is a single purpose computer to do this even more safely.

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