What Is the Role of Cryptocurrency Exchanges in Protecting against 51% Attacks?

Cryptocurrency exchanges play an important role in protecting against 51% attacks. They can monitor the networks of the cryptocurrencies they list for signs of an attack.

If an attack is detected, they can halt trading of the affected cryptocurrency to protect their users. Exchanges can also increase the number of confirmations required for a deposit, which makes it more difficult for an attacker to double-spend their coins.