The BFT blockchain consensus protocol prevents integrity attacks by miners as long as _______. Select one: a. none of th

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The BFT blockchain consensus protocol prevents integrity attacks
by miners as long as _______.
Select one:
a. none of the above
b. the proportion of miner computational power controlled by the
attacker is less than 1/2
c. the proportion of miners controlled by the attacker is less
than 1/3
d. the proportion of wealth controlled by the attacker is less
than 1/2
In the bitcoin blockchain system, the purpose of the miner Proof
of Work protocol is to prevent __________ as long as the majority
of miner computational power is controlled by honest miners.
Select one:
a.
none of the above
b.
addition of new block transactions
c.
making an unauthorised payment on behalf of another user
d.
modification of past block transactions