Ключевые слова: abstract, background, bitcoin, blockchain, blue, business, buy, coin, collectable, crypto, cryptocurrency, currency, cyber, digital, exchange, finance, flat, fungible, future, gold, golden, icon, illustration, innovation, internet, investment, market, metal, mining, modern, money, network, nft, non, nonfungible, pay, payment, sign, symbol, technology, token, transaction, unique, web, yellow,