Malicious miners can cause a little more impact. They can: •Attempt to create blocks that include or exclude specific transactions of their choosing. •Create a double spend by attempting to create a ‘longer chain’ of blocks that make previously accepted blocks become ‘orphans’ and not part of the main chain. They can realistically only do this if they command a significant proportion of the entire network’s hashing power. But they can’t: •Steal bitcoins from your account, because they can’t fake your digital signatures. •Create bitcoins out of thin air, because no other miners or bookkeepers
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