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(a) Describe the difference(s) of Gas mechanism in Ethereum before and after 2021 (the so-called London upgrade). (5 Marks) (b) People often criticise Ethereum for

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(a) Describe the difference(s) of Gas mechanism in Ethereum before and after 2021 (the so-called London upgrade). (5 Marks) (b) People often criticise Ethereum for its high transaction fee. Discuss what would happen if we modify Ethereum to completely eliminate transaction fee. (5 Marks) Page 4 of 5 (c) Describe two simple heuristics for bitcoin address ownership deduction. Illustrate your answer with examples. (10 Marks)

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