Data Management & Integration Flashcards

In a private data collection definition, what does blockToLive = 0 mean?

Answer: Private data is never purged

A value of 0 means the private data is retained indefinitely.

What is recorded on the channel ledger for a private data write?

Answer: A hash of the private data on all channel peers

Only the hash of the key and value goes into the block, while the data stays on authorized peers.

Why is the transient field used when submitting a private data transaction?

Answer: To pass sensitive inputs without recording them in the transaction on the ledger

Transient data is sent to endorsers but excluded from the transaction payload that is ordered.

What does memberOnlyRead = true enforce in a collection?

Answer: Only clients belonging to member orgs can read the private data through chaincode

The chaincode checks that the submitting client's org is a collection member before returning data.

What are implicit private data collections in Fabric 2.x?

Answer: Per-organization collections available without explicit definition, named _implicit_org_

Each org automatically has an implicit collection that chaincode can use without configuration.

How is private data distributed to other authorized peers during endorsement?

Answer: Via peer-to-peer gossip from the endorsing peer

The endorsing peer disseminates private data via gossip to authorized collection members before commit.

Which API lets chaincode verify private data without reading it, by comparing a hash?

Answer: GetPrivateDataHash

GetPrivateDataHash returns the on-ledger hash, which any channel member can use for verification.