CBSP

In which of the following attacks targeting Proof of Stake does an attacker create a divergent chain and race to make their chain longer than the real chain?A . Selfish Mining AttackB . Long-Range AttackC . Double-Spend AttackD . 51% AttackView AnswerAnswer: B

Both sidechains and slate channels rely on the original blockchain for security and as a fallback if issues occur.A . TrueB . FalseView AnswerAnswer: B

Proof of Work never guarantees that the blockchain network has reached consensusA . TrueB . FalseView AnswerAnswer: B

Which type of attack misuses Internet protocols to attack the blockchain? Select all that apply.A . Denial of ServiceB . EclipseC . SybilD . RoutingView AnswerAnswer: A,B,C

In which blockchain consensus algorithm does a user pay (give up coin forever) to participate in consensus?A . Proof of BurnB . Proof of WorkC . Proof of StakeD . Proof of ActivityE . None of the aboveView AnswerAnswer: A

Ring signatures are designed to do which of the following?A . Conceal transaction amountB . Conceal transaction recipientC . Conceal shared secretD . Conceal transaction senderView AnswerAnswer: D

If an attacker can find two values that hash to the same output what is it called?A . MatchB . IntersectionC . CollisionD . CorrelationView AnswerAnswer: C

Which of the following blockchains has a built-in consensus algorithm?A . EthereumB . CordaC . HyperledgerView AnswerAnswer: A

Which smart contract vulnerability allows an attacker to make a profit off a smart contract cryptocurrency exchange like Bancor?A . ArithmeticB . Access ControlC . Race ConditionsD . ReentrancyView AnswerAnswer: C

What is the easiest way to steal cryptocurrency from a user?A . Private key theftB . Double-spend attackC . Consensus hijackingD . Eclipse attackE . None of the aboveView AnswerAnswer: A