jm °è¦ªÝÔ,Mw#Ém¹ø%²£ é4y!x:^üßå·L4. David Chaum, Amos Fiat, and Moni Naor, Untraceable Electronic Cash, Advances in Cryptology CRYPTO '88, Springer-Verlag, pp. 319-327.
https://whatsonchain.com/tx/79f9b325cbe9c766388f34f403ba59242360fb7063ead489a2a5cc3b07c17656