Proof of Work vs Proof of Stake in Blockchain / Solidity - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the consensus mechanism used in Proof of Work.

Blockchain / Solidity

consensus = "[1]"

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

AProof of Stake

BProof of Work

CDelegated Proof

DByzantine Fault

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing Proof of Work with Proof of Stake.

Using unrelated consensus mechanisms.

The consensus mechanism for Proof of Work is called "Proof of Work" itself, where miners solve puzzles to validate transactions.

2fill in blank

medium

Complete the code to define the consensus mechanism used in Proof of Stake.

Blockchain / Solidity

consensus = "[1]"

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

AProof of Stake

BProof of Work

CProof of Authority

DProof of Capacity

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing Proof of Stake with Proof of Work.

Choosing unrelated consensus types.

Proof of Stake uses the "Proof of Stake" consensus mechanism where validators are chosen based on their stake.

3fill in blank

hard

Fix the error in the code that calculates the mining reward for Proof of Work.

Blockchain / Solidity

reward = base_reward [1] difficulty

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A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition instead of multiplication.

Using division or subtraction which do not make sense here.

The mining reward is typically calculated by multiplying the base reward by the difficulty factor.

4fill in blank

hard

Fill both blanks to complete the code that selects a validator in Proof of Stake based on stake and random chance.

Blockchain / Solidity

selected_validator = validators[[1]] if stake [2] threshold else None

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Aindex

B>

C<

Drandom()

Attempts:

3 left

💡 Hint

Common Mistakes

Using random() as index which is incorrect.

Using wrong comparison operators.

The validator is selected by index if their stake is greater than the threshold.

5fill in blank

hard

Fill all three blanks to complete the code that calculates the chance to validate a block in Proof of Stake.

Blockchain / Solidity

chance = ([1] / total_stake) [2] random.random() and chance [3] threshold

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

Auser_stake

B>

C<

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using division instead of multiplication.

Using wrong comparison operators in conditions.

The chance is calculated by multiplying user stake over total stake by a random number, then checking if chance is less than threshold.