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Digital Currency (GCSE Computing)

The following is a GCSE Computing test covering 'Digital Currency' from the broader topic 5. The Internet And Its Uses. The test is geared towards the CAMBRIGE-IGCSE exam board style syllabus.
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What does “gas” refer to on the Ethereum network?
What is the main difference between a fiat currency and most cryptocurrencies?
What is meant by “decentralization” in the context of digital currencies?
Which feature of many cryptocurrencies allows anyone to inspect the entire transaction history?
Why are private keys essential for cryptocurrency security?
What is “mining” in the context of cryptocurrencies like Bitcoin?
Which of these is a common use of blockchain beyond currency?
What is a “wallet address” in cryptocurrency systems?
Which regulatory concern is commonly raised about widespread cryptocurrency use on the internet?
What does KYC (Know Your Customer) typically require when using regulated crypto services?
Which practice helps protect a user when sending cryptocurrency to another person online?