I asked for an advice and all you do is trying to discredit me.
For credibility, you can
PM me a signed message from an address with a 17 character prefix. I won't post the address, but if it's real, I can confirm it for you.
I did this for
1NewbornSeatQVC9vegVHnxVseNAhhxewb.
Today I tried creating some cool addresses, 8-9-10 prefix long, got 0 results ...
seems harder then I thought
The "trick" is to create a very long list of prefixes, and use that as input. In my experience, 15,000 prefixes works fine, much higher numbers (say 1 million) give a much lower hash rate.
You won't know up front which one you'll find, but having many prefixes makes it thousands of times more likely to find one of them. That's how I found 1NewbornSeat, which would take me 25000 years for 50% chance to find it again on my laptop.