Ключевые слова: background, bank, banking, bit, bitcoin, block, blockchain, btc, business, buy, cash, chain, coin, commerce, concept, conceptual, crypto, cryptocurrency, cryptography, currency, current, digital, economy, electronic, exchange, finance, flat, gold, golden, internet, isolated, market, monetary, money, net, network, nobody, object, pay, payment, profit, sign, symbol, technology, trade, value, virtual, web,