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BITCOIN : BEARISH SIGNAL #bitcoincrash #bitcoinhalving #cryptocrash #btcToday he holds a large percentage of all bitcoins in "existence". Traditionally a currency was backed by something. Gold, silver, copper, or a. Mike Caldwell's Casascius physical bitcoins take rarity to a whole new level. Between and , he endowed over 27, coins and bars with nearly , His name was Mike Caldwell, but on the Bitcointalk forum, he was better known as Casascius. The physical bitcoin creator took a digital.