Measuring 25mm across, the hand-beaten coins were identified as silver groats by auctioneer Gordon Brockman.
Scotland's Stephanie Twell took bronze in the women's 1500m and England's Martin Brockman won decathlon bronze.
Brockman, 18, Pinpoint's chief technological officer, has done computer programming since he was 10.
Kent's Brockman stayed at the front throughout the race and finished more than 20 seconds ahead of Sempers.
Brockman has deferred his entrance to North Carolina State University's honors program until a later date as well.
The event was won by Canada's Jamie Adjetey-Nelson with 8, 070 points, New Zealand's Brent Newdick took silver after scoring 7, 899 points and Brockman scored 7, 712.
"It's unbelievable, " said 22-year-old Brockman, of the Medway and Maidstone club.
It was a remarkable end to the decathlon with Brockman needing to finish 16 seconds ahead of team-mate Kevin Sempers in the final event, then 1500m.
Richard II reigned for 22 years from 1377 to 1399 which, according to Mr Brockman, could mean that as few as 800 coins are still in existence.
While Brockman began solving the problems related to narrowing searches on the World Wide Web, Bowman drafted a business plan and studied other companies that went public.
Mr Brockman said the idea that the Spitfires were hidden to stay out of enemy hands was not necessarily correct because Japanese forces would have not been in a position to use them at that point.
Other conference goers, many of whom are Gadgetoff regulars, also shone: including Amazon's Jeff Bezos, TED conference founder Richard Saul Wurman, computer engineer Danny Hillis, polymathic inventor Dean Kamen, sly literary agent John Brockman and Creative Good's Mark Hurst.
"It's going to be a little bit different in a couple of years, waking up in the morning and sitting in a freshman English class rather than going to my computer workstation and hacking code all day, " Brockman said.
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