Ooh damn, now I see.
Offcourse, the wallet from the first blockchain definitely won't work on the new CN7 blockchain.
Downloading the latest wallet from github solved the problem.

The old wallet shows me a balance of 0 coins now. Is there any way to solve this?

P.S; Ambitious plan btw. Maybe even damn bright. This could replace these the oldskool plastic tokens which are commonly used for decades.
And that 80's shit, that doesn't fit longer in our digitalized environment.
This might even replace the physical tokens from different clubs across the country.

Thumbs up Devpimps, I'll keep on mining.😉👌👍