Ключевые слова: abstract, anonymity, anonymous, background, bank, bit, bitcoin, block, blockchain, blue, business, chain, coin, commerce, communication, concept, cryptocurrency, cryptography, currency, data, decentralized, digital, digital ledger, distributed database, economy, electronic, encrypted, exchange, finance, financial, green, hub, innovation, internet, money, net, network, networks, payment, security, sign, symbol, technology, transaction, virtual, web, white, world wide,