Bitcoin - A Detailed Anaylsis on What Works and What Does not
from web site
To increase financial personal privacy, a new bitcoin address can be produced for each transaction. If the exclusive key is shed, the bitcoin network will not recognize any type of other evidence of possession; the coins are then pointless, and efficiently shed. As an example, in 2013 one user declared to have lost 7,500 bitcoins, worth $7.5 million at the time, when he accidentally threw out a hard disk containing his private key.
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