How do casascius coins work?
Could you elaborate on the operational mechanism of Casascius coins? As a cryptocurrency enthusiast, I'm curious to understand how these unique physical representations of digital currencies function. Specifically, how are they created, authenticated, and redeemed? Do they have any unique security features or advantages compared to traditional digital coins? I'm also wondering if there are any limitations or risks associated with using Casascius coins. Your insight into this fascinating intersection of physical and digital currencies would be greatly appreciated.