What is the Double Spending Problem?
Double spending, in technical jargon, refers to the same units of a “digital” currency being spent twice. Such a practice can be associated with a high risk of abuse and price manipulation in the volatile world of cryptocurrencies, and can lead to a significant impairment of transaction records in crypto networks.
The blockchain has proven to be a useful tool that avoids such double spending. However, not all coins and tokens are as secure as Bitcoin. How secure a digital asset is depends primarily on the size of the network.