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If I have done the math right to come up with this hash, to confirm a true block and this is a confirmed hash. You can look it up here Bitcoin Block #570240

00000000000000000027b68db9d26885fec8dd3e785013f2355271b3ed991829

That should be 64 digits. If I try it on my phone calculator, is it y to the x power the right button to push? That gives a result of 26 lowercase letters + numbers 10 to equal 36. Would I push in 36 y to the 64 power? That gives a result of 4.01199191 to 99 digits long almost 100.

Is that math right for how many combinations there are?

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    It's in hexadecimal, so that's 10 digits and 6 letters. – Jannes Apr 5 at 2:34
  • Plus a valid block hash isn't a predetermined 256-bit (64-hexit) value, which would be completely infeasible; it's any value below the current target, often approximated by a number of leading zero bits or hexits. The target for that block (and all until the next recomputation) requires zeros for about 74 bits, or 18.5 hexits. A more exact cost is obtained by multiplying the difficulty shown at that link by 2^32 = 4294967296. – dave_thompson_085 Apr 5 at 22:44

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