A gaming company wants to allow players to use in-game items across multiple games built on different blockchains. They want to avoid a centralized marketplace. Which solution is most aligned with their goal?

Use cross-chain bridges to transfer the game items as NFTs between the different blockchains.

Use a single blockchain for all games and migrate existing games to that chain.

Create a centralized database that tracks item ownership across all games.

Issue a fungible token that can be used in all games.

A global remittance company wants to use a blockchain to reduce transfer costs. They must comply with anti-money laundering (AML) and know-your-customer (KYC) regulations in every country they operate. Which approach best balances regulatory compliance with the efficiency gains of blockchain?

Use a permissioned blockchain where all participants are vetted and transactions are only visible to authorized parties.

Use a public blockchain and rely on third-party analytics to identify suspicious transactions.

Use a public blockchain with pseudonymous addresses to avoid KYC requirements.

Use a private blockchain with no external access and manually verify each transaction.

A developer is building a dApp for a decentralized marketplace where users can list items and pay with cryptocurrency. The dApp must ensure that the seller receives payment only when the buyer confirms receipt. Which smart contract pattern is most appropriate?

Use a direct payment from buyer to seller without any intermediary.

Use a multi-signature wallet that requires both buyer and seller to approve the payment.

Use an escrow smart contract that holds the funds and releases them upon buyer confirmation.

Use a smart contract that automatically pays the seller after a fixed time period.

A food retailer wants to use blockchain to trace the origin of produce from farm to store. They need to share traceability data with customers and regulators, but also want to keep supplier pricing confidential. Which design is most effective?

Use a private blockchain with no external access and share data only with regulators.

Store all data on a public blockchain to maximize transparency.

Use a centralized database and publish a hash of the data on a public blockchain.

Store traceability data on a permissioned blockchain and provide customers with a public-facing verification portal.

EC-CouncilBlockchain Developer Certification

Domain 1Objective 2

Blockchain Ecosystem and Use Cases BDC Practice Questions (Page 3)

Part of the Blockchain Fundamentals and Architecture domain, which makes up ~14% of our current practice bank.

50questions here

10free pages

8concepts

Questions 11–15

11application · medium
A gaming company wants to allow players to use in-game items across multiple games built on different blockchains. They want to avoid a centralized marketplace. Which solution is most aligned with their goal?
Select an answer first
12foundation · easy
In the blockchain ecosystem, which component is primarily responsible for validating and adding new blocks to the distributed ledger?
Select an answer first
13expert · hard
A global remittance company wants to use a blockchain to reduce transfer costs. They must comply with anti-money laundering (AML) and know-your-customer (KYC) regulations in every country they operate. Which approach best balances regulatory compliance with the efficiency gains of blockchain?
Select an answer first
14application · medium
A developer is building a dApp for a decentralized marketplace where users can list items and pay with cryptocurrency. The dApp must ensure that the seller receives payment only when the buyer confirms receipt. Which smart contract pattern is most appropriate?
Select an answer first
15application · medium
A food retailer wants to use blockchain to trace the origin of produce from farm to store. They need to share traceability data with customers and regulators, but also want to keep supplier pricing confidential. Which design is most effective?
Select an answer first

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