Peppercoin
Encyclopedia
Peppercoin is a cryptographic
Cryptography
Cryptography is the practice and study of techniques for secure communication in the presence of third parties...

 system for processing micropayment
Micropayment
A micropayment is a financial transaction involving a very small sum of money and usually one that occurs online. PayPal defines a micropayment as a transaction of less than 12 USD while Visa prefers transactions under 20 Australian dollars, and though micropayments were originally envisioned to...

s. Peppercoin Inc. was a company that offers services based on the peppercoin method.

The peppercoin system was developed by Silvio Micali
Silvio Micali
Silvio Micali is an Italian-born computer scientist at MIT Computer Science and Artificial Intelligence Laboratory and a professor of computer science in MIT's Department of Electrical Engineering and Computer Science since 1983. His research centers on the theory of cryptography and information...

 and Ron Rivest
Ron Rivest
Ronald Linn Rivest is a cryptographer. He is the Andrew and Erna Viterbi Professor of Computer Science at MIT's Department of Electrical Engineering and Computer Science and a member of MIT's Computer Science and Artificial Intelligence Laboratory...

 and first presented at the RSA Conference in 2002 (although it had not yet been named.) The core idea is to bill one randomly selected transaction a lump sum of money rather than bill each transaction a small amount. It uses "universal aggregation", which means that it aggregates transactions over users, merchants as well as payment service providers. The random selection is cryptographically secure -- it cannot be influenced by any of the parties. It is claimed to reduce the transaction cost
Transaction cost
In economics and related disciplines, a transaction cost is a cost incurred in making an economic exchange . For example, most people, when buying or selling a stock, must pay a commission to their broker; that commission is a transaction cost of doing the stock deal...

 per dollar from 27 cents to "well below 10 cents."

Peppercoin, Inc. was a privately held company founded in late 2001 by Micali and Rivest based in Waltham, MA
Waltham, Massachusetts
Waltham is a city in Middlesex County, Massachusetts, United States, was an early center for the labor movement, and major contributor to the American Industrial Revolution. The original home of the Boston Manufacturing Company, the city was a prototype for 19th century industrial city planning,...

. It has secured about $15M in venture capital in two rounds of funding. Its services have seen modest adoption. Peppercoin collects 5-9% of transaction cost from the merchant. Peppercoin, Inc. was bought out in 2007 by Chockstone for an undisclosed amount.
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