Ключевые слова: abstract, anonymity, anonymous, background, bank, bill, bitcoin, block, block chain, blue, business, cash, chain, coin, commerce, communication, concept, cryptocurrency, currency, data, decentralized, design, digital, digital ledger, distributed database, dollar, economy, electronic, encrypted, encryption, exchange, finance, financial, gold, icon, illustration, innovation, internet, money, network, payment, salary, security, symbol, technology, transaction, web, world wide,