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To get most out of the blockchain, it is best:


A) to use it for the whole business logic. It's always best to have everything in once place.
B) to use it only for things which need the benefits of the blockchain.

C) A) and B)
D) undefined

Correct Answer

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Variables of the type address store:


A) a 20 bytes value
B) a 32 bytes value
C) a string
D) a 20 characters long hex number

E) A) and B)
F) C) and D)

Correct Answer

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Truffle:


A) is a framework that helps developers with Testing, Deployment and Management of Smart Contracts and Distributed Applications.
B) is a library that helps developers to connect to Ethereum nodes, because it abstracts the JSONRPC interface.
C) is a framework for Java, similar to Web3.js for JavaScript. It's a great way to develop distributed Java enterprise applications.

D) A) and C)
E) B) and C)

Correct Answer

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If a User calls contract A and that calls Contract B, then msg.sender in Contract B will contain the address of:


A) the User.
B) contract A.

C) A) and B)
D) undefined

Correct Answer

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Having a bug-bounty program early on:


A) can help to engage the community in testing your smart contracts and therefore help to find bugs early.
B) might be a burden as it is an administrative overhead mainly.
C) is completely useless. Who wants to test beta-ware software? It's better to start with the bug-bounty program after the contract is released on the main-net.

D) All of the above
E) B) and C)

Correct Answer

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