Quote from: Bulista on Today at 09:16:55 AM

Nice to see this puzzle is still on going. It’s been years and I totally forgot about this.

So the conclusion until now is that it is only possible to crack the keys with brute force and no formula was found?

Was thinking to start working on this again but when I think of the amount of brain cells that are going to be destroyed I just shake it off.

What I could eventually do is provide some funds for funding of hardware or something needed.

Anyone thinks that with the help of some funds it can help to crack the case?

OP! Bulista Welcome back! Nice to meet you again mate, Glad to see you alive! Are you doing okay?

There are currently no known formula and will probably not be one to be found for the puzzle private keys which did not reveal its public key. The only way to search and find 66 is the bruteforcing.

HOWEVER: every 5 bits have their public key revealed which makes it easier to solve with a LOT of known formula for example Kangaroo made by Jan or BSGS (Baby Step). Nonetheless recently puzzle 120 and 125 got solved from the same persons or group of people which make us doubt that there are indeed a hidden formula that is being used to solve the puzzles that have their pub keys revealed.
Keep in mined, the possible hidden formula applies only for the puzzles addresses, that haves their pub keys revealed. For 66, there is almost 100% certainty that it will not be possible to solve exepct by bruteforcing. Because the hash cannot be undone, so there is no way to escape.