Once upon a time, there was a man who thought it would be cool to give Bitcoin (BTC) a physical form. That was Mike Caldwell. He created Casascius coins, which were physical metal tokens with real Bitcoin value embedded into a tamper-evident hologram sticker stuck on the token. Currently, Caldwell is a Managing Partner at Utah-based Casascius Capital LLC. Issued in a range of denominations and materials, from solid brass 1 BTC coins to gold-plated 100 BTC savings bars, Casascius coins were a novel form of cold storage in the years before hardware wallets came into the picture. But Caldwell suspended sales on November ... (full story)