The double spending problem refers to the risk that a digital currency can be spent more than once. Since digital assets can be easily copied, there’s a possibility that someone could make multiple transactions using the same digital token.This issue is particularly critical for decentralized systems, where there’s no central authority to verify transactions. If a user attempts to spend the same coin in two different places simultaneously, without a mechanism to prevent this, it could lead to fraud.To combat this problem, most cryptocurrencies use blockchain technology. Each transaction is recorded on a public ledger, which ensures that the network participants can see and verify the record of ownership. Once a transaction is confirmed, it becomes part of the chain, making it nearly impossible to alter.By relying on consensus mechanisms and cryptographic techniques, systems can effectively prevent double spending. This ensures trust and security, allowing users to transact confidently.