“The authors are particularly concerned about the Bitcoin Payment Messages system scheduled for release along with version 0.9 of the cryptocurrency. That mechanism would allow merchants to request payment from customers, rather than simply providing them with an address to send payments to. Payments would be completed using digital certificates owned by the merchants, and would contain customer and merchant metadata linked to specific transactions. [The paper] worries that Bitcoin Payment Messages will make it possible – and therefore mandatory – to issue receipts, playing further into the hands of the regulators.”
