Ключевые слова: anonymous, back, background, bank, banking, bit, bit coin, bitcoin, black, blockchain, business, cash, coin, commerce, concept, conceptual, crypto, crypto currency, cryptocurrency, cryptography, currency, digital, e business, e commerce, ecommerce, economy, electronic, exchange, finance, financial, front, gold, golden, icon, international, internet, isolated, market, mining, monetary, money, net, network, payment, reflection, shopping, sign, symbol, virtual, web,