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    <subfield code="a">Beyond bitcoin</subfield>
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    <subfield code="e">the economics of digital currencies</subfield>
    <subfield code="f">Hanna Halaburda, Miklos Sarvary</subfield>
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    <subfield code="a">1 Introduction. 2 Medium of Exchange: Ever-Present Competition. 2.1. The Medium of Exchange&#x2014;Historical Overview. 2.2. What Roles Does Money Serve? 2.3. Competing Money. 2.3.1. Coexistence Is Costly. 2.3.2. Network Effects. 2.3.3. The Difficulty of Introducing New Currency: Excess Inertia. 2.3.4. Coexistence of Various Currencies. 2.4. Virtual Money? 3 Platform-Based Currencies. 3.1. Special Currencies of the Off-Line World. 3.2. Platform-Based Currencies in the Digital Era. 3.2.1. Online Video Games and World of Warcraft Gold. 3.2.2. Virtual Worlds and Linden Dollars. 3.2.3. Social Networks and Facebook Credits. 3.2.4. Promotion Platforms and Amazon Coins 3.3. The Future of Platform-Based Currencies. 4 Cryptocurrencies. 4.1. The Double-Spending Problem. 4.2. How Does Bitcoin Work? Brief Overview. 4.3. Not the First One&#x2014;Predecessors of Bitcoin. 4.4. New Challenges. 4.5. Competition against Other Cryptocurrencies. 4.6. More than Just a Currency. 4.7. Trading Cryptocurrencies. 4.8. How Do Cryptocurrencies&#x2019; Attributes Compare with Earlier Money? 4.9. Competition against State-Issued Currencies. 5 The Road Ahead. Notes. References. Index.</subfield>
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