Blockchain BTA Certified Blockchain Developer - Ethereum - CBDE FREE EXAM DUMPS QUESTIONS & ANSWERS

A. to check internal states that should never happen. B. to check input arguments from users.

A. Solidity, Viper, LLL and Serpent, because those are high level languages that are compiled down to bytecode. B. Solidity and JavaScript, because those are the official first implementations for Distributed applications and the Blockchain supports those languages fully. C. Java, C++, Solidity and JavaScript, because the Ethereum Blockchain is completely language agnostic and cross compilers exist for every major language.

A. with external contracts holding those values. This way we can make sure that the information flow is following a clear logic and nobody else can access this information. B. with private state variables. This way nobody else other than the smart contract itself can see the information C. You can't hide anything on the blockchain, because the information is public, just the call is private which means only other smart contracts would be limited in accessing that information.

A. False, it's necessary to use Ganache or even a real private network for testing. B. True, but it's still good to use Ganache, or even a real private network for testing.

A. to hold instances of other contracts. B. to implement pointers to other contracts that can hold new datatypes. C. to define a new datatype in Solidity, so you don't need to use objects of another contract.

A. the timestamp can be influenced by a miner to a certain degree but it's always independent from the time-zone. B. the timestamp can't be influenced by a miner and is generally considered safe to be used for randomness on the blockchain. C. the timestamp is based on the time zone of the miner, that is why it changes the difficulty continuously to reflect network latency.

A. Gwei, Szabo, Finney, Ether. B. Wei, Finney, Szabo, Ether, Tether. C. Finney, Szabo, Mether, Gwei.

A. is used to ensure safe communication between miners. B. is used to communicate between the blockchain node and externally running applications. C. is a mean of dumping the blockchain data in a so-called consensus export. D. is used to communicate between blockchain nodes.