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Imagine an attacker has amassed 20% of the network's hash power, and is looking to trick someone by double spending a 1-confirmation transaction. He sends
Imagine an attacker has amassed 20% of the network's hash power, and is looking to trick someone by double spending a 1-confirmation transaction. He sends 10 btc to Bob, Bob waits for 1 confirmation, and sends the attacker some other cryptocurrency in exchange. Now the attacker creates an alternative transaction that spends the same coins to himself instead, and has to create a block containing his double-spend transaction, as well as another block based on that previous one, in order to create a 'longest chain' containing his double spend. What is his probability of succeeding? Enter answer in percents, accurate to two decimal places
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