288,230,376,151,711,740

288 quadrillion attempts with a 50% luck factor

that's exa in greek unit notation as in giga peta exa

bitcoin hashrate in the whole world right now, is at 600M terahash so yeah... a million times the current bitcoin hash rate to discover this key is the cost, not gonna happen in less than 100 years

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also, just to note, deriving the private key of a public key is a lot more computation than an SHA256 hash - there still isn't ASICs to do this afaik, though i think there is probably work being done, since elliptic curve modular arithmetic is becoming more and more important to security