Cross-Chain Communication and Interoperability Protocols BBLC Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A fintech startup is building a platform that connects multiple independent blockchain networks, each with its own consensus mechanism. They want to use a hub-and-spoke model where a central chain provides shared security and validates messages between the connected chains. Which interoperability architecture should they adopt?

   • AA relay chain with parachains, similar to Polkadot's design
   • BA hash-locking protocol for each pair of chains
   • CA notary scheme with a single trusted validator for all chains
   • DA federated bridge with a different validator set for each chain pair
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   A gaming company wants to let players transfer in-game items between a Polygon sidechain and an Ethereum mainnet. The company needs a solution that does not require players to trust a central operator and where the security of the sidechain is ultimately anchored to Ethereum's security. Which interoperability approach fits this requirement?

   • AA hash-locked atomic swap for each item transfer
   • BA notary scheme with a single trusted validator
   • CA federated bridge operated by the gaming company
   • DA sidechain with its own consensus secured by a relay chain
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   A company wants to transfer data between a private Hyperledger Fabric network and a public Ethereum network. The company wants to minimize the trust placed in any single entity and wants the transfer to be verifiable by both networks' participants. Which bridge mechanism should they choose?

   • AA sidechain that replicates both networks' state
   • BAn atomic swap for each data transfer
   • CA multi-signature notary bridge with signers from multiple organizations
   • DA single notary operated by the company
   Reveal Solution Discussion Select an answer first
5. 4expert · hard

   A bank is evaluating a bridge to move tokenized securities between a private permissioned network and a public blockchain. The bank's risk team requires that a compromise of the bridge operator cannot result in the loss of user funds, and the bank wants to minimize the number of trusted parties. Which bridge design best satisfies both constraints?

   • AA federated bridge with a 3-of-5 multi-signature scheme
   • BA light-client bridge that verifies the source chain's consensus rules on the destination chain
   • CA notary bridge operated by a single trusted custodian
   • DA sidechain with a centralized operator that holds all bridged assets
   Reveal Solution Discussion Select an answer first
6. 5expert · hard

   A consortium is choosing between Polkadot and Cosmos for connecting multiple enterprise blockchains. They require that each member chain can have its own governance and validator set, but they also want a shared security model to reduce the cost of securing each chain. Which architecture best meets both requirements?

   • AA single shared blockchain with all members as validators
   • BCosmos with independent zones connected via IBC
   • CPolkadot's relay chain with connected parachains
   • DA network of notary bridges between each pair of chains
   Reveal Solution Discussion Select an answer first