Ключевые слова: agreement, background, bitcoin, black, blockchain, business, button, color, colorful, concept, contract, contracts, cryptocoin, cryptocurrency, currency, data, digital, document, electronic, ethereum, finance, icon, illustration, information, internet, isolated, key, lock, mine, miner, mining, money, neon, password, pick, private, protect, protection, safe, safety, secure, security, set, sign, symbol, technology, tool, web,