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Despite it not being legal tender, Bitcoin charts high on popularity, and has triggered the launch of hundreds of other virtual currencies collectively referred to as Altcoins. KEY TAKEAWAYS Launched in 2009, Bitcoin is the world's largest cryptocurrency by market cap.2 Unlike fiat currency, Bitcoin is created, distributed, traded, and stored with the use of a decentralized ledger system known as a blockchain.1 Bitcoin's history as a store of value has been turbulent; the...