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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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Question 1
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What is a “wallet address” in cryptocurrency systems?
Why might someone prefer a non-custodial wallet over a custodial wallet on an exchange?
In public-key cryptography used by many digital currencies, what does a private key do?
What is an Initial Coin Offering (ICO)?
What is “mining” in the context of cryptocurrencies like Bitcoin?
What does KYC (Know Your Customer) typically require when using regulated crypto services?
What is a “node” in a cryptocurrency network?
What does “gas” refer to on the Ethereum network?
Which of these is a common use of blockchain beyond currency?
What does “double spending” refer to in digital currency systems?
Which regulatory concern is commonly raised about widespread cryptocurrency use on the internet?