A cross-chain gaming platform wants to move in-game assets between a high-throughput sidechain and a mainnet. The team is worried about the risk of a bridge exploit and wants to minimize the amount of value at risk in the bridge contract. Which strategy is most effective?

Use a single admin key to pause the bridge in case of an emergency.

Rely on the sidechain's consensus to validate all bridge transactions.

Move all assets to the bridge contract to ensure liquidity for users.

Implement a bridge with a daily transfer limit and a time-delayed withdrawal mechanism.

A consortium of banks wants to create a cross-chain payment system that connects their private permissioned blockchains with public networks. They require that transaction data remain confidential and that only authorized parties can view it. What is the most suitable approach?

Use a trustless bridge with on-chain light-client verification

Use a federated bridge with private channels and encryption

Use a public relay chain that broadcasts all transaction data

A security auditor is reviewing a federated bridge that uses a 7-of-11 multisig. The auditor is concerned about the risk of validator collusion. Which mitigation strategy would be most effective?

Rely on the bridge's reputation and hope validators do not collude.

Use a single hardware security module (HSM) to store all private keys.

Increase the multisig threshold to 9-of-11 and require validators to be from different jurisdictions.

Reduce the number of validators to 3 to make coordination easier.

A cross-chain DeFi protocol wants to offer lending across multiple chains but needs to ensure that the total value locked (TVL) is not double-counted when the same asset is bridged to multiple chains. What is the most effective approach?

Use a federated bridge that locks assets on the source chain and mints on the destination chain.

Rely on oracles to report the total supply of the token on all chains.

Use a canonical bridge that burns tokens on the source chain and mints on the destination chain, with a global accounting system.

Allow each chain to independently report its TVL without coordination.

A cross-chain DeFi platform wants to incorporate real-world asset prices into its smart contracts that run on multiple blockchains. The team needs a solution that is reliable, resistant to manipulation, and works uniformly across all supported chains. What should they implement?

Use a single off-chain API that each blockchain's smart contract calls directly

Use a trusted bridge to fetch prices from a single source chain

Deploy a decentralized oracle network like Chainlink on each supported blockchain

Have each blockchain maintain its own independent price feed from a different data provider

EC-CouncilBlockchain Developer Certification

Domain 9Objective 4

Interoperability Innovations BDC Practice Questions (Page 5)

Part of the Advanced Concepts and Future Innovations domain, which makes up ~12% of our current practice bank.

54questions here

11free pages

6concepts

Questions 21–25

21expert · medium
A cross-chain gaming platform wants to move in-game assets between a high-throughput sidechain and a mainnet. The team is worried about the risk of a bridge exploit and wants to minimize the amount of value at risk in the bridge contract. Which strategy is most effective?
Select an answer first
22application · medium
A consortium of banks wants to create a cross-chain payment system that connects their private permissioned blockchains with public networks. They require that transaction data remain confidential and that only authorized parties can view it. What is the most suitable approach?
Select an answer first
23expert · medium
A security auditor is reviewing a federated bridge that uses a 7-of-11 multisig. The auditor is concerned about the risk of validator collusion. Which mitigation strategy would be most effective?
Select an answer first
24expert · medium
A cross-chain DeFi protocol wants to offer lending across multiple chains but needs to ensure that the total value locked (TVL) is not double-counted when the same asset is bridged to multiple chains. What is the most effective approach?
Select an answer first
25application · medium
A cross-chain DeFi platform wants to incorporate real-world asset prices into its smart contracts that run on multiple blockchains. The team needs a solution that is reliable, resistant to manipulation, and works uniformly across all supported chains. What should they implement?
Select an answer first

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