Christopher Wood, global head of equity strategy at Jefferies, has eliminated Bitcoin from his flagship Greed & Fear model portfolio, citing concerns that developments in quantum computing could pose an existential threat to the cryptocurrency's cryptographic foundations. In the latest edition of the widely followed newsletter, Wood confirmed that Jefferies has removed its entire 10% Bitcoin allocation, replacing it with a split allocation of 5% to physical gold and 5% to gold-mining equities, according to Bloomberg.