Quantum Computing Threatens Blockchain

There is certainly debate over whether quantum computing will be able to hack the blockchain. We know distributed ledger is a very strong form of security, dispersing records across hundreds of thousands or millions of nodes. However quantum computers will be able to accomplish things that as of now, we are not even aware of. It's better to err on the side of being conservative and prepare for post-quantum security now. No harm is done since organizations that install post-quantum security will also protect against current classical threats.

https://www.bbntimes.com/technology/is-quantum-computing-threatening-blockchain