not any programs pure mathematics

Sure, so pure that thousands of bitcoins gone missing with no clue, lol.

Congrats to solver, make sure to hodl, this is a rare  opportunity.

If the method used was indeed Kangaroo in this case the #125 will not be touched before 10 or 15 years according to current programs and technology  
The smallest keys from 66 are already starting to be unreachable without pubkey

Actually #66 is very feasible. It just needs a little time like puzzle 64. it will eventually be cracked before year 2025.

64 took years .. statistically speaking, 66 will take 4 times that time .. unless someone gets very VERY lucky VERY quickly by using the random range search technique.

Ignore the dude it was his pure speculation for sure.

Now for the serious part, if the puzzle solver is not the creator, then it won't matter who solved it because it means they are using the conventional ways known to all. UNLESS, (and that's a crazy theory) .. the solver was using quantum technology and using it very cleverly. In that case, we're all doomed because it means solving any subsequent puzzle before the guy would be impossible.

Remember Alberto in a post when i said 120 would be easier to solve than 66 because typical brute force cracking can not beat BSGS jumps due to its lack of efficiency? And then you told me that's not correct? Here i am .. right as hell .. but who cares if I'm right when I'm talking to one of my role models lol, I'm a big BIG fan of yours, man .. actually your work plus WanderingPhilosopher's is beating the genius of JeanLuc's, especially your CPU-based BSGS mode.. simply amazing.

people might call me crazy but I strongly believe 125 would still be solved before 66 .. I'm kinda familiar with brute force as a concept since the late 90s .. so i know how inefficient it is.. in fact, even the strongest hardware would struggle to brute force its way into a range as big as 66 .. and if it does, the owner of that hardware would be stupid to spend so much money only to land on 0.66 BTC .. although maths says I'm wrong about which of the two puzzles is easier than the other.. but maths won't solve the dilemma of getting lucky when random searching .. so basically what I'm saying is: i would rather random-BSGS-jump my way to puzzle 125 than just random-brute-force my way to puzzle 66. Someone gets me 100x RTX4090s and only then i would be more than happy to go back to bitcrack. And even then i would still be very pessimistic about the outcome.

I'm looking forward to see a new Kangaroo build from you 😍

#125 & #130 would be solved before #66

I'll put it this way, when you know the public key at 120, it's logically easier to crack than a 64 puzzle address

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the one who broke 120 will be someone new because he forgot to take bitcoin cash and other coin