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  2. Portal, a decentralized Bitcoin exchange, raises $34 million ...

    www.aol.com/finance/portal-decentralized-bitcoin...

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  3. List of bitcoin companies - Wikipedia

    en.wikipedia.org/wiki/List_of_Bitcoin_companies

    cryptocurrency exchange Incorporated in Antigua and Barbuda. Declared bankruptcy in 2022. Ghash.io (CEX.IO) 2013 United Kingdom: London: mining pool (CEX.IO was an exchange) Closed in October 2016 [citation needed] Huobi: 2013 Singapore: bitcoin exchange [citation needed] Kraken: 2011 United States: San Francisco: bitcoin exchange [citation ...

  4. Portal:Numismatics - Wikipedia

    en.wikipedia.org/wiki/Portal:Numismatics

    Numismatics is the study or collection of currency, including coins, tokens, paper money, medals and related objects. Specialists, known as numismatists, are often characterized as students or collectors of coins, but the discipline also includes the broader study of money and other means of payment used to resolve debts and exchange goods .

  5. Portal:Money - Wikipedia

    en.wikipedia.org/wiki/Portal:Money

    The Money Portal. Money is any item or verifiable record that is generally accepted as payment for goods and services and repayment of debts, such as taxes, in a particular country or socio-economic context. The primary functions which distinguish money are: medium of exchange, a unit of account, a store of value and sometimes, a standard of ...

  6. Currency - Wikipedia

    en.wikipedia.org/wiki/Currency

    Currency. A currency [a] is a standardization of money in any form, in use or circulation as a medium of exchange, for example banknotes and coins. [1] [2] A more general definition is that a currency is a system of money in common use within a specific environment over time, especially for people in a nation state. [3]

  7. History of money - Wikipedia

    en.wikipedia.org/wiki/History_of_money

    The history of money is the development over time of systems for the exchange, storage, and measurement of wealth. Money is a means of fulfilling these functions indirectly and in general rather than directly, as with barter . Money may take a physical form as in coins and notes, or may exist as a written or electronic account.

  8. Certified Acceptance Corporation - Wikipedia

    en.wikipedia.org/wiki/Certified_Acceptance...

    Certified Acceptance Corporation (CAC) is a Far Hills, New Jersey third-party coin certification company started in 2007 by coin dealer John Albanese. The firm evaluates certain numismatically valuable U.S. coins already certified by Numismatic Guaranty Corporation (NGC) or Professional Coin Grading Service (PCGS).

  9. Currency Exchange International - Wikipedia

    en.wikipedia.org/wiki/Currency_Exchange...

    Currency Exchange International (CXI) is a foreign currency exchange company in the United States. The company provides wholesale services for financial institutions and other foreign currency exchange companies as well as retail services at branch locations. The company's products and services include the exchange of foreign currencies; wire ...