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About Bitcoin
Bitcoin is the first decentralized cryptocurrency. Nodes in the peer-to-peer bitcoin network verify transactions through cryptography and record them in a public distributed ledger, called a blockchain, without central oversight. Consensus between nodes is achieved using a computationally intensive process based on proof of work, called mining, that secures the bitcoin blockchain. Mining consumes large quantities of electricity and has been criticized for its environmental impact.
Based on a free market ideology, bitcoin was invented in 2008 by Satoshi Nakamoto, an unknown person. Use of bitcoin as a currency began in 2009, with the release of its open-source implementation. In 2021, El Salvador adopted it as legal tender. It is mostly seen as an investment and has been described by many scholars as an economic bubble. As bitcoin is pseudonymous, its use by criminals has attracted the attention of regulators, leading to its ban by several countries as of 2021. WikipediaAbout Hong Kong Dollar
The Hong Kong dollar is the official currency of Hong Kong. It is subdivided into 100 cents. Historically, it was also subdivided into 1000 mils. The Hong Kong Monetary Authority is the monetary authority of Hong Kong and the Hong Kong dollar.
Three commercial banks are licensed by the Hong Kong Monetary Authority to issue their own banknotes for general circulation in Hong Kong. These banks, HSBC, Bank of China, and Standard Chartered, issue their own designs of banknotes in denominations of HK$20, HK$50, HK$100, HK$150, HK$500, and HK$1000, with all designs being similar to one another in the same denomination of banknote. However, the HK$10 banknote and all coins are issued by the Government of Hong Kong.
As of April 2019, the Hong Kong dollar was the ninth-most traded currency in the world. Hong Kong uses a linked exchange rate system, trading since May 2005 in the range US$1:HK$7.75–7.85.
Apart from its use in Hong Kong, the Hong Kong dollar is also used in neighbouring Macau. It is pegged at 1 Hong Kong dollar to 1.03 Macanese patacas, and is generally accepted at par or MOP 1.00 for retail purchases. Wikipedia