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A comment on Post office stamps as currency (1862). Parent comment

Re:Post office stamps as currency (1862) by lukejduncan on Monday April 17, 2017 @08:53PM (#14135713)
According to Planet Money, an in person block chain is used in at least one prison. http://www.npr.org/sections/money/2017/02/10/514577243/episo...
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