

But what if, not one member, but some group of members try to alter blockchain?
Will the system still remain immutable?
The attackers then can manipulate the transactions.
This attack occurs when blockchain is not fairly distributed across multiple independent nodes and miners.
It becomes very easy for miners to launch a 51% attack because they will be very few in numbers.
If any blockchain network is fairly distributed then there is a good chance that it is not prone to 51% attack.





