This is a quote from the book "Bitcoin: A Peer-to-Peer Electronic Cash System" by Satoshi Nakamoto
...urning the change, if any, back to the sender.

It should b
e noted that fan-out, where a transaction depends on several transactions, and those transactions depend on many more, is not a problem here. There is never the need to extract a complete standa lone copy of a transaction's history.

10. Privacy
The traditional banking model achieves a level of privacy by limiting access to information to the parties involv...
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