I just received an e-mail from the "Bullion Coin" people...
"BullionCoin launch date coincides with Nixon Shock of August 15th 1971. The difference in 2017 is made by bringing back the Gold and Silver Standard."
Their notification says:
Digital Gold Limited introduces BullionCoin Market which constitutes of two closed marketplace ecosystems:
• Primary Marketplace where BullionCoin is created - BullionCoin Exchange (BCX)
• Secondary Marketplace where BullionCoin is traded - BullionCoin System (BCS)
If you want to know more - be looking for tomorrow's launch of bullioncoin.com