financial data security

Technologists, entrepreneurs, and some big companies are busy dreaming up new ways of using the core of Bitcoin—a distributed cryptographic ledger, or blockchain—to reinvent everything from business contracts and health records to carbon credits and new trading platforms (see “Why Bitcoin Could Be Much More Than a Currency”). However, one expert warns that they may be building their dreams on top of a precarious foundation. Emin Gün Sirer, an associate professor at Cornell University, has been researching ways in which Bitcoin and blockchains can fail...

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