Which type of blockchain is defined mainly by its data-visibility architecture — a genuine blend of public and private data in one network?

Hybrid blockchain. PIB defines a hybrid blockchain as a blend of public and private blockchains allowing selective data access. That matches the stem. IBM says a public blockchain is open for anyone to join. PIB says a private blockchain is restricted to selected participants within an organization. PIB says a consortium blockchain is governed jointly by multiple organizations. Neither of those two descriptions is a blend of public and private data.

According to NIST, what happens to the later blocks if a previously published block is changed?

They all end up with different hashes. NIST says a changed block would have a different hash. That would cause all subsequent blocks to also have different hashes. IBM says the hash makes it nearly impossible to alter any block without changing all subsequent blocks. Neither source says later blocks are deleted or copied to a central repository.

Which statement about India's National Blockchain Framework (NBF) is supported by PIB?

It was initiated in March 2021 and officially launched on 4 September 2024. PIB says the NBF was initiated in March 2021 with a budget outlay of Rs 64.76 crore and officially launched on 4 September 2024. PIB's 2024 release says the NBF supports two permissioned platforms. It places the hosting at NIC data centres in Bhubaneswar, Pune and Hyderabad. So the public-only, 2019 and Delhi-Mumbai-Chennai options are unsupported.

Which description does NIST use for blockchain ledgers, rather than calling them completely immutable?

Tamper evident and tamper resistant. NIST says most publications describe blockchain ledgers as immutable, but this is not strictly true. It calls them tamper evident and tamper resistant. PIB uses the word immutable and also says the design makes unauthorized modifications virtually impossible. The other three options are not NIST's description.

According to the RBI's Concept Note on CBDC, what can the technology platform for a CBDC be?

Either a distributed ledger or a centralised system. The Concept Note says the platform can either be a distributed ledger or a centralised system. The Budget Speech 2022-23 said the Digital Rupee would use blockchain and other technologies. Neither source says the platform must be a distributed ledger only, a bank-run database only, or a public blockchain.

NITI Aayog's draft paper on blockchain says the majority of viable use cases will be which kind?

Permissioned ones, not public blockchains. NITI Aayog's draft paper says the majority of viable use cases for blockchain will be permissioned ones, not public blockchains. PIB says the National Blockchain Framework platform is built on a permissioned blockchain. Neither source says use cases will be mostly hybrid or limited to cryptocurrency networks.

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In PIB’s backgrounder on the National Blockchain Framework, which description fits a consortium blockchain?

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In PIB’s backgrounder on the National Blockchain Framework, which description fits a consortium blockchain?

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