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Bitcoin mining is profitable only for those who run multiple computers with high-performance video processing cards and who join a group of miners to combine hardware power.Researchers Neil Gandal, JT Hamrick, Tyler Moore, and Tali Oberman claimed that in late 2013, price manipulation by one person likely caused a price spike from US$150 to more than US$1000.A multisignature wallet is one where multiple private keys are required to move the bitcoins instead of a single key.