ok, I give up so quickly.

)) If the owner of this puzzle confirm is there another way(math way or something) to solve it, not brute force then I will join again. brute force normal bitcoin brain wallet is easy than this one.
why not try last 6 key have pubkey for reference search
read from first page they protect one person solve puzzle can pick all address no match no algorithm all random pick so best method brute force then
I give up method all brute force (scan everything)
but still think figure out about select brute force target may be better but still no idea how to.