[deepblueocean]

Why? Why not simply set a minimum quantum for transactions in Zerocoin, like the penny or the satoshi? Or why not redeem the Zerocoin for a Bitcoin, which is divisible and which would be free of (traceable) history.

[emin_gun_sirer]

Because each coin transaction entails a 40KB zero knowledge proof. So a Satoshi will require 40*10^8 KB transferred for a 1BTC transaction.