[PhilosAccnting]

I'm probably speaking _way_ out of my league here, but I imagine it's somehow spoofable, kinda like how you can generate fake MACs or IPs, so why not? One terrifying/beautiful element of tech is that where there's a will there's a way!

[wbobeirne]

It's spoofable in the same way that a hash collision or guessing a password is "spoofable", given infinite time and / or energy you could. But the chain would move on while you're generating your spoof, and you're limited by the constraints of the physical world and your available computing power.

[SavantIdiot]

Not exactly... You just need the majority to agree that the new manipulated chain is the real chain. You don't need to find a SHA256 collision.