Ключевые слова: background, bank, banking, bit, bitcoin, business, buy, cash, circle, coin, community, concept, cryptocurrency, cryptography, currency, decentralized, digital, ebusiness, economy, electronic, exchange, finance, financial, gold, golden, graph, international, internet, investment, keyboard, laptop, market, metal, mining, money, object, pay, payment, protocol, rate, savings, sign, stock, symbol, tablet, technology, trade, value, virtual, web,