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354                                                 11  Electronic Commerce Payment Systems and Order Fulfillment

           Basically, it only functions as a currency because there is a  comers would experience rapid growth (in the 130–200%
           community of users willing to treat it as such. Finally, digital  range). Yet, the mature markets would still garner the lion’s
           currency is a generic term that refers to the digital representa-  share.
           tion (0 s and 1 s) of either e-money (fiat) or virtual currency   However, the problem with the estimates are that, then
           (non-fiat). So, e-money and virtual currency are types of digi-  and now, it is very difficult to assess the exact values associ-
           tal currency but not vice versa.                   ated with the game-based and Bitcoin currencies, although
              Virtual currency covers two sub-types:  non-convertible  for different reasons. For game-based you not only have to
           (closed)  and  convertible (open).  According  to the U.S.  calculate an exchange rate but many of the game companies
           Treasury’s Financial Crimes Enforcement Network (fincen.  don’t provide the necessary data to do a reasonable assess-
           gov), convertible virtual currency is a virtual currency that  ment. For Bitcoin the number of coins in circulation is
           has “an equivalent value in real currency, or acts as a substi-  known, however their exact value is dependent on exchange
           tute for real currency.” Some examples include the crypto-  rates that can fluctuate substantially at any given time. The
           currencies like Bitcoin and most retail e-coupons. In contrast,  value is subjective and based on market volatility and the
           a  nonconvertible virtual currency is a virtual currency  going rates paid by the Bitcoin exchanges. For example, in
           used in a specific virtual world or domain that cannot (theo-  the spring of 2016 the total number of Bitcoins in circulation
           retically) be exchanged for fiat currency. Many of the better  was around 15.5 billion and the price was fluctuating between
           known examples come from online games. Some examples  $400 and $450. That’s a difference of around $6.2 billion to
           of this would include: World of Warcraft Gold, Farm(ville)  $6.7 billion which is fairly substantial.
           Cash, and Q Coin from TenCent QQ. In these games success
           is based on obtaining virtual money, which is earned by com-
           pleting various tasks or purchased using real money (which   Bitcoin and Other Cryptocurrencies
           is often the primary source of income for the game com-
           pany).  Technically, these currencies cannot be used or  Among the (digital) virtual currencies, the one that has gar-
           exchanged in the outside world. However, it many cases sec-  nered the most attention is Bitcoin. From previous discus-
           ondary markets (black or not) have arisen that are willing to  sion, it was stated that Bitcoin is an encrypted, decentralized
           exchange the nonconvertible currency into a fiat currency or  (peer-to-peer), convertible, virtual currency. Taken together
           some other virtual currency.                       it sounds complex, and it is. That’s why we will simply touch
              A key feature of nonconvertible, virtualized currencies is  the surface of how it works along with its advantages and
           that they are  centralized. This means that there is a single  disadvantages. For those who are interested, there are any
           administrative authority in charge of regulating the currency—  number of books (e.g., Antonopoulos  2015)  and Youtube
           issuing the currency, establishing rules of use and exchange  videos devoted to various aspects of its history, underlying
           rates, tracking payments, and controlling the amount in circu-  mathematics, structure, operation, and uses. Instead, in this
           lation. In contrast, convertible virtual currencies can be either  discussion we’ll hit the highlights of these elements.
           centralized or decentralized. A decentralized virtual currency
           is distributed, open-sourced, and peer-to-peer.  There is no   Bitcoin Background
           single administrate authority who oversees and monitors the
           currency. This is the nature of many of the cryptocurrencies  The origin of Bitcoin comes from a specification and proof
           like Bitcoin which we’ll discuss momentarily.      of concept developed in 2009 by Satoshi Nakamoto and pub-
                                                              lished in a paper entitled “Bitcoin: A Peer-to-Peer Electronic
             Size of the Virtual Currency Market              Cash System.” That’s not his real name, it’s a pen name. The
                                                              real identity of the inventor is still unknown. After the initial
           A couple of years back, the Yankee Group (McKee 2013)  development, Satoshi left the project in the hands of a com-
           accessed the size of the virtual currency market. Their analy-  munity of open source developers (see bitcoin.org), mean-
           sis included both the mature virtual currencies like loyalty  ing that the development and maintenance of the underlying
           points, credit card points, air miles and physical coupons, as  code is being done by a community in much same ways as
           well as the up-and-coming (digital) virtual currencies includ-  projects like Linus and Apache.
           ing app-based coins and tokens, personal information and   Bitcoin was not the first system to propose a decentralized
           time (exchanged) for apps and tokens, and Bitcoins. At that  virtual currency. However, it was the first to come up with a
           time (2012), the total value of all the virtual currency mar-  decentralized system that offered a useable solution to what
           kets was close to $48 billion with the mature currencies mak-  is known as  the  double-spend problem.  As the concept
           ing up close to 97% of the total. They estimated that by 2017,  implies, in a virtual currency double-spending refers to the
           the mature markets would grow steadily, while the up-and-  result of spending the same money more than once. For
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