"In carrying out electronic commerce over the Internet, it will be necessary to handle high
volume of small transactions that are of low value; typically, each transaction's value may range from a few cents to a few dollars. With the current transaction fee structure, some of existing credit-card base protocols, such as NetBill [9] and SET [10], do not seem to be suitable for supporting small or micropayments"


Digital Coins based on Hash Chain
1997 09 04 http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.108.1526

https://csrc.nist.gov/csrc/media/publications/conference-paper/1997/10/10/proceedings-of-the-20th-nissc-1997/documents/072.pdf

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