Consider the following scenario: A large department store chain is being pressured by lawmakers to provide evidence that proves the store's clothing is not produced through child labor. This is no easy task currently due to the store's clothing being transferred between at least 6 different parties in between creation and placement at the storefront. The store chain is considering the use of blockchain to solve their problem. Discretion in the reading and writing of transactions is highly important to the store chain to protect its proprietary interests.
Which solution would best solve the product need?
A. Use a public blockchain that supports assets, then create a new clothing asset for each item created. When the clothing item is transferred to the next party in the process, require that the associated blockchain asset be transferred to the next party's blockchain account with relevant metadata. The lawmakers can now view the transactions and transfers at any time.
B. Use a permissioned blockchain to build the technology. Require every party involved in the process to host a node on you network. Create a new clothing asset for each item created. When the clothing item is transferred to the next party in the process, have the previous party use your web portal to initialize a chaincode Smart Contract to transfer control of the asset. When the next party receives the asset have them use your web portal to initialize a chaincode Smart Contracts to acknowledge receipt of the asset. Provide read-only permissions to the lawmakers so they can receive the evidence they are looking for.
C. Both options are equally suitable
D. None of the above
A private blockchain like Hyperledger would be the right choice for which scenario:
A. An enterprise that needs to build a scalable, secure, permissioned blockchain application
B. A network of family members who want to share passwords and other secure information with one another
C. Developers who want to rapidly prototype public blockchain solutions
D. A startup that desires to build a token and blockchain application for their users
E. All of the above
Consider the following scenario: A solo app developer wants to create their own cryptocurrency and build a blockchain based that allows users to buy and sell second-hand items with that cryptocurrency from each other. Before the transaction is considered complete, the purchaser must put the funds in an escrow service and the sender must enter the courier tracking number into that same escrow. Time is of the essence and this developer doesn't want to worry about networking of infrastructure. This app must be fully autonomous or "decentralized".
Which architecture would best solve the product need?
A. Ethereum for token creation and escrow service; User-facing features built with web technologies and deployed through IPFS
B. Ethereum for token creation; Traditional multitier API and database for escrow service; User-facing features built in web technologies then minified unto a String and deployed to an Ethereum Smart Contract
C. Hyperledger Fabric for the escrow service and token creation using chaincode; User-facing features built with Hyperledger Composer
D. The product cannot be built. Fully decentralized apps are not yet possible for user interface
Taking a series of unrelated transactions and writing them to a particular block is:
A. Highly insecure and considered bad practice
B. Most common in public blockchain
C. Most common in permissioned blockchains
D. Required among all blockchains
If a product's requirements call for public autonomous on-chain code, only using open source code, using cryptographic tokens, and allowing its users the ability to earn tokens, this product should be launched on the Ethereum blockchain.
A. FALSE
B. TRUE
If a company desires to create a unique cryptocurrency and launch a new blockchain network to host it.
A. They must use ERC20 standard for the token, clone the Ethereum Virtual Machine, then launch a series of nodes
B. They must use ERC20 standard for the token and can use any open source blockchain tool/system to launch a series of nodes
C. They can both create their own cryptocurrency and launch their own blockchain network with any common open source blockchain tool/system
D. None of the above
Consider the following scenario: Due to consistent inaccuracies and outdated real estate listings, a residential real estate company wants to build a blockchain solution that accurately depicts which homes (assets) are available for purchase across all countries/provinces. All available homes should be publicly viewable by the general consumer audience, but certain details of the home, such as history of maintenance, should only be viewable by licensed real estate professionals.
Which architecture would best solve the product need?
A. Public data hosted on a public blockchain, Privileged data security hoisted on a private database
B. The entire solution built on a private blockchain with proper permissions for both public and privileged data
C. Public and privileged data on hybrid blockchain will Proof of Stake consensus
D. Public data hosted on a public blockchain; Privileged data hosted on a private blockchain
Pending transactions on the Ethereum blockchain are always ordered by highest fee paid to lowest, and then written to the block in that order.
A. FALSE
B. TRUE
Which technical feature of blockchain best promotes the notion of a blockchain being "censorship resistant"?
A. An immutable ledger of transactions
B. Permissions-based transactions
C. Smart Contracts/transactional code that is executed "on chain"
D. Consensus systems through Proof of Work and Proof of Stake
In what way(s) can Ethereum Smart Contract functions be invoked?
A. Only through code executed in other Smart Contracts and XML-RPC
B. Through code executed in other Smart Contracts and through web3.js or any JSON-RPC library
C. Only through code executed in another Smart Contract
D. Smart Contracts cannot be externally invoked. They become autonomous at launch and cannot be called.
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