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The DAO was a digital decentralized autonomous organization [5] and a form of investor-directed venture capital fund. [6] After launching in April 2016 via a token sale, it became one of the largest crowdfunding campaigns in history, [6] but it ceased activity after much of its funds - in the form of US$ exchanged for "Ether-crypto coins" - were taken in a hack in June 2016.
The Bitfinex cryptocurrency exchange was hacked in August 2016. [1] 119,756 bitcoins, worth about US$72 million at the time, was stolen.[1]In February 2022, the US government recovered and seized a portion of the stolen bitcoin, then worth US$3.6 billion, [2] by decrypting a file owned by Ilya Lichtenstein (born 1989) that contained addresses and private keys associated with the stolen funds. [3]
IPOPT is part of the COIN-OR project. IPOPT is designed to exploit 1st derivative and 2nd derivative information if provided (usually via automatic differentiation routines in modeling environments such as AMPL). If no Hessians are provided, IPOPT will approximate them using a quasi-Newton methods, specifically a BFGS update.