Cross-Chain Communication and Interoperability Protocols BBLC Practice Questions (Page 6)

Questions 26–30

1. 26expert · hard

   A bank is considering a blockchain bridge to transfer tokenized bonds between a private permissioned network and a public Ethereum network. The bank's compliance team requires that the bridge cannot rely on a single point of failure and that the security model must be auditable by external regulators. Which bridge design should the bank select?

   • AA single notary operated by the bank itself
   • BAn optimistic bridge with fraud proofs and a 7-day challenge period
   • CA hash-locked atomic swap for each bond transfer
   • DA multi-signature notary bridge controlled by three independent institutions
   Reveal Solution Discussion Select an answer first
2. 27foundation · easy

   Which interoperability mechanism involves a trusted third party that attests to events on one blockchain to another blockchain?

   • ASidechain
   • BNotary scheme
   • CRelay chain
   • DHash-locking
   Reveal Solution Discussion Select an answer first
4. 28foundation · easy

   What is a fundamental challenge of achieving interoperability between different blockchain networks?

   • AEach blockchain has its own consensus rules, data formats, and trust assumptions
   • BInteroperability is impossible because each blockchain is completely isolated by design
   • CAll blockchains use the same programming language, making integration trivial
   • DBlockchains cannot store any form of data other than transaction records
   Reveal Solution Discussion Select an answer first
5. 29application · medium

   A developer needs to enable cross-chain token transfers between two networks that both support smart contracts. The developer wants a solution that does not require a trusted third party and where the security is based on the underlying chains' consensus. Which interoperability type should they use?

   • AA relay chain that requires a central coordinator
   • BA sidechain with a federated validator set
   • CA hash-locked atomic swap
   • DA notary scheme with a single trusted operator
   Reveal Solution Discussion Select an answer first
6. 30application · medium

   A developer wants to build a new blockchain that can communicate with existing networks in the Cosmos ecosystem. The developer wants to use a standardized protocol for transferring tokens and data between zones without building custom bridge code. Which approach should they take?

   • ABuild a custom notary bridge to each other zone
   • BUse a hash-locked atomic swap for each token transfer
   • CImplement the Inter-Blockchain Communication (IBC) protocol
   • DDeploy a sidechain that replicates all other zones' state
   Reveal Solution Discussion Select an answer first