Is there any particular reason for this?
Because in normal circumstances, this shouldn't be an issue if you're the sole owner of the private key.
Solved puzzle 66 or something?
its about this topic bitcoin puzzle
i saw people talk about things didn't know or hear about beore
Okay, as I thought.
There are actually a few topics here that already addresses that concern and the consensus is:
"
it's not currently possible without the help of a trusted cooperating mining pool/solo miner".
Here's to point you to one of the threads:
solve key 66 67 Puzzle how to avoid double spends the tx?AFAIK, there are other discussions that aren't in the first page or posted as a reply to other topics.