Bitcoin plunged more than 10 per cent Thursday, sparking a hunt for reasons the notoriously volatile asset was selling off. One that captured attention questioned the very viability of the token itself -- though it turned out not to be cause for concern. A report in a trade blog suggested that there had been what’s known as a double-spend, where the same token is used by the same person in two transactions. It’s like if someone bought a car, paid the seller, drove off with their brand new wheels and then later yanked back all the money. In the case of the blockchain -- or the software that underlies Bitcoin and other ... (full story)