This is a quote from the book "Bitcoin: A Peer-to-Peer Electronic Cash System" by Satoshi Nakamoto
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As an additional firewall, a new key pair should be used for each transaction to keep them from being linked
to a common owner. Some linking is still unavoidable with multi-input transactions, which necessarily reveal that their inputs were owned by the same owner. The risk is that if the owner of a ke
y is revealed, linking could reveal other transactions that belonged to the same owner.
We consider the scenario of an attacker trying to generate an a...