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Step 1: purchase, borrow, or steal enough hash power to reach 51% for a short while

Step 2: use this power to force enough transactions to make yourself rich enough to keep 51% power indefinitely

Step 3: profit

51% hash power lets you doublespend coins. It does not let you steal from wallets or change the block reward rules.

Which is sufficient to allow you to do what I suggested. Spend coin once on paying for everything, and again on yourself to keep all the money to spend again later.

So you become like a government, able to print more currency at will?

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