Introduction to Blockchain

Blocks are used to store __ in blockchain.

• logs

• transactions

• messages

• emails

A transaction can be __.

• fund transfer related

• smart contract deployment related

• smart contract function invocation related

There are many nodes in a blockchain network.

• TRUE

• FALSE

Every node in the blockchain network maintains a __.

• ledger

• common password

• transaction

• state variable

The ledger maintained by every node must be __.

• having same blocks and same transaction in blocks

• different from ledgers of other nodes

• different in length

• having a back-up copy in every node

A new block with transactions will be __ to the ledger.

• inserted

• appended

• projected

• summarized

Blocks are cryptographically linked to provide __.

• scalability

• transparency

• interoperability

• immutability

A __ is needed to ensure the consistency of blockchain state.

• timer

• regulator

• synchronizer

• consensus protocol

No permission is needed to join or leave a __ blockchain.

• private

• public

• consortium

__ blockchain is owned and governed by multiple entities.

• private

• public

• consortium