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  2. Virtual currency - Wikipedia

    en.wikipedia.org/wiki/Virtual_currency

    A virtual currency that can be bought with and sold back is called a convertible currency. A virtual currency can be decentralized, for example bitcoin, a cryptocurrency. Transacting or even holding convertible virtual currency may be illegal in particular jurisdictions and to particular national citizens at particular times and the transactor ...

  3. Bitcoin - Wikipedia

    en.wikipedia.org/wiki/Bitcoin

    Bitcoin (abbreviation: BTC; sign: ₿) is the first decentralized cryptocurrency. Nodes in the peer-to-peer bitcoin network verify transactions through cryptography and record them in a public distributed ledger, called a blockchain, without central oversight.

  4. Virtual currency law in the United States - Wikipedia

    en.wikipedia.org/wiki/Virtual_currency_law_in...

    [21] Although the defendant did not pass the Liberty Dollars currency as a counterfeit, the currency were in close enough "resemblance of coins of the United States or of foreign countries" and consequently fell under the authority of 18 U.S.C.A. § 486.123 The Court has not decided if § 486 includes the power to prohibit VCs, but if a Court ...

  5. Cryptocurrency - Wikipedia

    en.wikipedia.org/wiki/Cryptocurrency

    A cryptocurrency, crypto-currency, or crypto [a] is a digital currency designed to work as a medium of exchange through a computer network that is not reliant on any central authority, such as a government or bank, to uphold or maintain it. [2]

  6. Manipulative (mathematics education) - Wikipedia

    en.wikipedia.org/wiki/Manipulative_(mathematics...

    Mathematical manipulatives play a key role in young children's mathematics understanding and development. These concrete objects facilitate children's understanding of important math concepts, then later help them link these ideas to representations and abstract ideas.

  7. Digital currency - Wikipedia

    en.wikipedia.org/wiki/Digital_currency

    Digital currency can be denominated to a sovereign currency and issued by the issuer responsible to redeem digital money for cash. In that case, digital currency represents electronic money (e-money). Digital currency denominated in its own units of value or with decentralized or automatic issuance will be considered as a virtual currency.

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