Let's say you found a collision for an address on the Bitcoin network. You have its private key.
Will you be able to transfer any money around or will the network prevent it or does it get verified?
Here's another way of putting it: Can the address generated by 2-of-3 pv/pk be accessed by a 4th pv(a collision) or the network always looks for 2 of those 3 signing the transaction. Is that clear now?
Is multisig only a way for shareholders of an address, making sure enough of them are present during a transaction, or does the network actually prevents a transfer without all the necessary signatures?