Whenever you need to build a decentralized system that stores unalterable data records, blockchain is the answer. A blockchain is a type of distributed ledge, consisting of blocks of data that maintain a permanent and tamper$-$proof record of transactional data. A blockchain is formed by linking together blocks, which are data structures containing a hash, previous hash, and data.

The goal of this activity is for you to identify terms associated with blocks in a blockchain.

Instructions: Match each term to its correct definition.

$1$

Previous hash

$2$

Data

$3$

Hash

Match each of the options above to the items below.

Transactional data$-$sender$,$ receiver, number of coins

Hash of the previous block in the blockchain

The block's unique identifier$-$like a fingerprint