If you know a little about blockchain, you must be aware of the double-spending problem too which occurs when the blockchain network is disrupted and the crypto is stolen or in other words, double-spent. What happens actually is the thief duplicates the transaction and makes it look legitimate. It is not easy to double spend and hence the practice is not common however it does occur. Blockchain ends the double-spending problem through the use of consensus mechanisms like proof of work that is carried by decentralized networks of miners. The network not only helps maintain fidelity but detects double spending of the coin to prevent stealing.