Hello at all.
A few days ago I saw some videos on instagram ( but couldn't find it anymore),with a nice coin production.4 cards are turned over( like the roll over aces), an one coin after another appear under every single card. Could somebody tell me the name if it? Or where I find a tutorial of it?

Unless you can show us the instragram video, it's really hard to say what it is. There are probably a number of card -> coin productions like that.

A trick called Circles by Bob Fitch , Apocalypse in 1979. One card is rolled over four times and a coin appears each time. If I recall, you must be able to classic palm four coins and let them drop one at a time:

Thanks to both of you! I will check it!

Greg Gleason has a very similar routine also, if you search it you will find it.

I found one of the Videos!
https://www.instagram.com/reel/C4fatYCPg......cjB3eA==

Yes, looks like Fitch’s Circles effect.

That's a neat effect, but is very different from your original description of "4 cards are turned over( like the roll over aces), an one coin after another appear under every single card."

Yes. Normaly what I saw in one of the Videos was made with 4 cards. But I think it's the same principle.

There is a routine taught by Dan Fleshman (Rollover Coins) where a card is rolled over revealing 4 coins. It is in his book Coin Miracles, as well as on one of his dvds as Rollover Production (Restaurant Magic 3), and is also taught in Rubinstein Coin Magic in Leonard Rangel's trick, Three Flight, that appears in the Friends section on page 436.