Problems like Double Spending

Hi guys,

do you know problems like double spending and how the different coins tackle these problems? Is there a good source where I can find everything in one place? I need this for an presentation I have to write. Your help is appreciated.

Edit: An example would be a 51% attack, but there are for sure more problems these different coins have to deal with.

Look at Komodo - they help all POW coins prevent 51% attacks. Komodo uses a DPOW consensus and notarizes everyting to the main BTC chain. By using Komodo, multiple small chains are protecting themselves from 51% attacks.

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Thanks for your answer, maybe I could use that for my presentation. I will have a look at it.