Monero’s Chain Hits Reverse: 18 Blocks Replaced in Deep Reorg
news.bitcoin.com
Learn about the largest reorg in Monero's history and what it means for recent transactions and blockchain integrity.

When Bitcoin was hijacked back in 2017 and most miners were forced to mine BTC instead of the real Bitcoin BCH there was concern of 51% attacks.

Bitcoin Cash implemented rolling checkpoints to protect the chain. A similar strategy can help Monero now.

https://bchfaq.com/knowledge-base/what-are-rolling-checkpoints/

Bitcoin Cash is the bitcoin based cousin of Monero, I recommend the Monero community start getting familiar with Bitcoin Cash just in case XMR is taken down.

Download the premier desktop wallet and start exploring the real Bitcoin. - https://electroncash.org/