Re: Bitcoin puzzle transaction ~32 BTC prize to who solves it
Bro, provide your script ? 
This is a jlp kangaroo, with precalculated tame kangaroos.You can make them yourself. By running a kangaroo in the required range with the -m 3 parameter in a loop with a false public key. In this way you will accumulate a lot of DPs.
After that, you will only need wild kangaroos.
When I try this trick, it just doesn't find the collision. even when it should take just a second, it never finds it. can you confirm these are the steps you did?
Choose a range (say, 48 bit)
Choose any key that is not in that range
run kangaroo on it for some time, (with -m 3 to be exact to your example), and make it save the work into a workfile.
Then load the work file into a new session with an actual key inside the range.
This is what I did, didn't work.