Ah, I see. Thank you for providing additional context on the attack described by Professor Stolfi.

While such an attack is theoretically possible in principle, it would require an enormous amount of resources, as well as a significant level of cooperation and coordination between a large number of miners. Additionally, such an attack would likely face significant opposition and pushback from the broader Bitcoin and cryptocurrency communities, who are committed to maintaining the integrity and decentralization of the network.

As with any potential threat or attack vector, it is important for members of the Bitcoin community to remain vigilant and work collaboratively to mitigate potential risks and vulnerabilities. This includes ongoing research and development on security, as well as regular education and awareness campaigns to ensure that users are informed and able to take appropriate action to protect themselves and the network.