To hack a Blockchain, you must have control of at least 51% of its computational power. As a result, attempting a double-spending attack on the Blockchain is considered a hacking attempt. As a result, we may deduce that blockchains can be hacked. However, this is neither a simple nor inexpensive job depending on the Blockchain. Several factors influence the cost of a 51 percent assault on the Blockchain. This suggests that achieving this goal on one's own is unlikely. Furthermore, robust hacking blockchains, such as the ones used by Bitcoin, are exceedingly complicated. It also necessitates the use of numerous powerful mining computers. That's why, in recent years, there haven't been any such occurrences involving the Bitcoin blockchain.