CBE Blockchain Interoperability and Scalability 2

Question 1

What is the Lightning Network's approach to scaling Bitcoin transactions?

Accepted Answer

Payment channels that allow off-chain bilateral transactions settled on-chain only when channels close

Answer

Increasing Bitcoin's block size to 4MB

Answer

Using ZK-proofs to batch Bitcoin transactions

Answer

Moving Bitcoin transactions to a Proof of Stake sidechain

Question 2

In Polkadot's architecture, what role does the Relay Chain play?

Accepted Answer

It provides shared security and consensus for all connected parachains

Answer

It hosts all smart contracts for the Polkadot ecosystem

Answer

It acts as a bridge exclusively to the Ethereum mainnet

Answer

It stores all parachain transaction data on-chain

Question 3

What is a 'wrapped token' in the context of blockchain interoperability?

Accepted Answer

A tokenized version of an asset from one blockchain pegged 1:1 and usable on another blockchain

Answer

A token with built-in privacy features using zk-SNARKs

Answer

A token that automatically rebalances across multiple DeFi pools

Answer

An NFT that wraps multiple fungible tokens into a single asset

Question 4

What problem does the 'blockchain trilemma' describe?

Accepted Answer

The difficulty of simultaneously achieving decentralization, security, and scalability in a single blockchain

Answer

The challenge of supporting three different consensus mechanisms at once

Answer

The impossibility of bridging three different blockchain networks reliably

Answer

The trade-off between transaction speed, cost, and privacy

Question 5

Which cross-chain standard does Polkadot use for message passing between parachains?

Accepted Answer

XCM (Cross-Consensus Message Format)

Answer

IBC (Inter-Blockchain Communication)

Answer

HTLC (Hash Time-Locked Contracts)

Answer

ABI (Application Binary Interface)

Question 6

What is a 'state channel' and how does it improve blockchain scalability?

Accepted Answer

A private off-chain communication channel where parties exchange signed state updates, settling only the final state on-chain

Answer

A dedicated high-bandwidth channel between full nodes for faster block propagation

Answer

A smart contract that batches state transitions and submits them hourly

Answer

A sharded partition of the blockchain state assigned to a validator subset