Why blockchain exists - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the main purpose of blockchain.

Blockchain / Solidity

purpose = "Blockchain exists to provide [1] and transparency."

Drag options to blanks, or click blank then click option'

Aspeed

Bcomplexity

Csecurity

Dcentralization

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing speed or centralization as the main purpose.

Blockchain is mainly used to provide security and transparency in transactions.

2fill in blank

medium

Complete the code to show what blockchain removes from traditional systems.

Blockchain / Solidity

blockchain_removes = "[1] trust in a central authority"

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Aremoves

Bignores

Cincreases

Drequires

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'increases' or 'requires' trust in central authority.

Blockchain removes the need to trust a central authority by using decentralized verification.

3fill in blank

hard

Fix the error in the statement about blockchain's data structure.

Blockchain / Solidity

blockchain_structure = "Blockchain stores data in [1] that are linked together."

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Afiles

Bblocks

Cdatabases

Dfolders

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'files' or 'databases' which are not specific to blockchain.

Blockchain stores data in blocks that are linked in a chain.

4fill in blank

hard

Fill both blanks to complete the sentence about blockchain's verification process.

Blockchain / Solidity

Verification in blockchain is done by [1] and recorded in [2].

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Anodes

Bminers

Cblocks

Dusers

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing nodes or users with miners, or folders with blocks.

Blockchain transactions are verified by miners and recorded in blocks.

5fill in blank

hard

Fill all three blanks to complete the code describing blockchain's key features.

Blockchain / Solidity

features = {"[1]": "decentralized", "[2]": "immutable", "[3]": "transparent"}

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Asecurity

Bconsensus

Cdata

Dledger

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up ledger with security or consensus with data.

The blockchain ledger is consensus-based, data is immutable and transparent.