"Imagine for puzzle 66, for a single computer that i have, I need about 2,500 years to be able to get one of his lowest easiest puzzles which are 6.6BTC"
Well, yes, the author of Puzzle suggests searching for the key 2 ^ 158. No pub key! As I understand it, we must brute force. ))) Guys, well, you're not idiots! Why did you
2500 years? I have estimated with the help of my mentor, that I need around 40,000 years to brute force 66. So you are way ahead of me.
I guess the point of this "crap" is to show off, here some free bitcoins in the easiest bit ranges for grab, collect them if you can.
It also is an indication to warn people why using addresses more than once is not a good practice, as we all know exposed public keys can endanger the security of private key exponentially.
No, a public key exposed is not even slightly a threat to a wallet address security .. it's as hard as a hidden public key .. don't let puzzles like #120,#125 etc fool you into thinking that solving the key got any easier.. a regular wallet's public key lies in the 253 - 256 bit range .. which is impossible to run bruteforce against and find a private key .. it would take billions of years and maybe more .. even trying to use math and tools to solve a 160 bit public key is impossible in our world .. but in theory, yes, Satoshi designed public keys to be used once then thrown away, just in case.