Interoperability Innovations BDC Practice Questions (Page 9)

Questions 41–45

1. 41expert · medium

   A bridge has been exploited, and the team needs to recover funds and prevent future attacks. The bridge uses a federated validator set and a smart contract that mints wrapped tokens. Which immediate action is most appropriate?

   • AImmediately mint new wrapped tokens to compensate users.
   • BIgnore the exploit and hope the attacker does not return.
   • CDelete the bridge contract to prevent further use.
   • DPause the bridge contract and rotate all validator keys.
   Reveal Solution Discussion Select an answer first
2. 42expert · medium

   A developer needs to enable a cross-chain token swap between Bitcoin and Ethereum without using a centralized exchange or a bridge that holds funds in custody. The swap must be atomic: either both sides settle or neither does. Which mechanism should be used?

   • AA federated bridge with a multisig wallet that holds the Bitcoin and mints an ERC-20 token.
   • BHash time-locked contract (HTLC) atomic swap between the two chains.
   • CA relay chain that processes the swap as a single transaction across both chains.
   • DAn oracle that confirms the Bitcoin transaction and then triggers the Ethereum transaction.
   Reveal Solution Discussion Select an answer first
4. 43application · medium

   A developer wants to build a new blockchain that can natively communicate with other chains in the Cosmos ecosystem and also plans to support smart contracts. Which framework should they choose?

   • AHyperledger Fabric with a custom bridge.
   • BSubstrate with the Cumulus library for parachains.
   • CCosmos SDK with the IBC module enabled.
   • DA custom EVM fork with no interoperability modules.
   Reveal Solution Discussion Select an answer first
5. 44expert · hard

   A developer is evaluating IBC and a custom bridge for a new application. The application requires high throughput and low latency. The developer is concerned about the overhead of IBC's consensus verification. What should they consider?

   • AA custom bridge can be optimized for the specific chains, potentially offering lower latency
   • BIBC is always slower than a custom bridge
   • CThe developer should always choose IBC because it is standardized
   • DIBC is not suitable for high-throughput applications
   Reveal Solution Discussion Select an answer first
6. 45foundation · easy

   What is validator collusion in the context of cross-chain bridges?

   • AWhen validators increase the transaction fees on a bridge
   • BWhen a group of validators controlling a bridge conspires to approve fraudulent transactions
   • CWhen validators automatically approve all transactions without checking
   • DWhen validators from different blockchains share their private keys with each other
   Reveal Solution Discussion Select an answer first