Ключевые слова: abstract, background, bank, banking, bit, bitcoin, btc, business, buy, cash, coin, commerce, concept, conceptual, crypto, cryptocurrency, cryptography, currency, cyberspace, digital, ebusiness, ecommerce, economy, electronic, exchange, finance, financial, gold, golden, international, internet, investment, many, market, metal, miner, mining, monetary, money, net, pay, payment, shiny, shopping, symbol, threedimensional, trade, trading, virtual, web,