a certain document existed at a certain time in the past
February 27, 2009 From : Hal Finney
"BTW I don't remember if we talked about this, but the other day some people were mentioning secure timestamping. You want to be able to prove that a certain document existed at a certain time in the past. Seems to me that bitcoin's stack of blocks would be perfect for this. "
Hal Finney
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