I have seen similar marks on currency

I was just wondering what purpose the chopmarks serve on the coins? My understanding is that when these marks are made by different countries on paper currency, it is to show that the bill has been verified as genuine and not counterfeit. Is it the same for the coins? And if so, doesn't it seem like a waste of time for coins, as the probability of someone counterfeiting a coin is much less that for paper money. I have never heard of these coins, so I guess you learn something new every day. For some reason these coins have peaked my interest. I like to look for error coins among the thousands of coins I look at each month, but this is different, as they are marked intentionally. Ayway, I was just curious about the reason behind the marks. I look forward to any responses on this.