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1) Describe the selfish mining strategy below, and also provide the state machine in their analysis from the Financial Cryptography 2014 paper, Majority is not

1) Describe the selfish mining strategy below, and also provide the state machine in their analysis from the Financial Cryptography 2014 paper, "Majority is not Enough: Bitcoin Mining is Vulnerable" by Ittay Eyal , Emin Gun Sirer.

2) Describe the common prefix property for Bitcoin blockchain.

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