Data Management & Integration Flashcards

How does Hyperledger Sawtooth store global state?

Answer: In a Merkle-Radix tree

Sawtooth's global state is a Merkle-Radix tree, which enables state root hashes and verification.

In Hyperledger Indy, what should NOT be stored on the public ledger?

Answer: Personally identifiable information (PII)

Indy keeps PII in holders' wallets and puts only public identifiers and metadata on the ledger.

What does the Fabric blockchain (ledger) component contain, compared with the world state?

Answer: An immutable, append-only log of all transactions, valid and invalid

The blockchain records every ordered transaction with its validation flag; world state is a derived view.

After a chaincode calls DelState on a key, what remains?

Answer: The key is removed from world state, but earlier values remain in blocks

Deletion only affects the current state, while the immutable blockchain retains past transactions.

What is a Fabric ledger snapshot used for?

Answer: Joining a channel from a given block height without replaying all earlier blocks

Snapshots (Fabric 2.3+) let a new peer bootstrap from a point-in-time state instead of pulling the full history.

Which Hyperledger project focuses on interoperability between different ledgers through connectors?

Answer: Hyperledger Cactus

Cactus provides pluggable connectors to integrate and transact across heterogeneous blockchains.

In Hyperledger Besu, how are private transactions between a subset of participants handled?

Answer: Via privacy groups with a private transaction manager such as Tessera

Besu stores private payloads off-chain in Tessera and only places a hash marker on the public chain.