If a hard fork occurs on a public blockchain software and 20 running nodes choose not to update, what can be said about those 20 nodes?
A. They are effectually now operating on a different blockchain network than the nodes that updated
B. They are considered "out of compliance"
C. They are flagged for removal from the network and can no longer collect fees
D. They are unable to achieve consensus
What is the accepted best practice for preventing contract addresses from changing when a new contract is released?
A. Move your contract to a new blockchain
B. Delete the old contract and add the new version in its place
C. Addresses always change so use a calling contract
D. Use the "- -addressForce" parameter when releasing a new contract
Transactions can only be added to a blockchain.
A. TRUE
B. FALSE
Proof of Stake consensus is most often needed for and implemented by:
A. Blockchain networks with low traffic
B. Permissioned blockchains
C. Blockchains that manage wealth and assets
D. Public blockchains
In common blockchain design, which data structure is used to create a lightweight digital fingerprint of all the transactions within a block?
A. Blockchains are unique in that they utilize no data structures
B. Lexicographic Search Tree
C. Bloom Filter
D. Merkle Tree
To determine the anticipated load on an application, the number of end users should be considered along with?
A. The location of the user
B. The average number of transactions per user
C. The average age of the user
D. The average bandwidth speed of the user
To prevent duplicate addresses/accounts from being generated on the same blockchain network, the input of the hash function that generates the address:
A. Should never be plain text
B. Should always be numerical
C. Should first be encrypted
D. Should contain enough entropy or randomness
In public key cryptography, the private key is used to:
A. Encrypt the public key
B. Generate unique hash values each time it is used
C. Verify the digital signature of a public key
D. Sign/approve any transaction/action that might be made by the holder of the key pair
Records on a public blockchain are deleted by?
A. They cannot be deleted
B. Filing a request with the Ethereum Foundation
C. Recalling the transaction of Etherscan.io
D. Deleting the transaction from the app that sent it
One consideration that should be taken into account when building a product on a public blockchain is:
A. Blockchain fees associated with transactions that both the product and the user may have in order to use the product on that blockchain
B. What countries the blockchain is available in
C. How you can transfer your tokens to another blockchain if you decide to switch
D. How often the blockchain goes offline for maintenance
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