Question $1$: Having read the excerpt above, choose a consensus mechanism relatively similar

to that used by Polkadot from options below:

a$.$

Proof$-$of$-$work

b$.$

Proof$-$of$-$stake

c$.$

Delegated proof$-$of$-$stake

d$.$

Proof$-$of$-$Capacity

Question $2$: Why would Polkadot choose Proof$-$of$-$Stake over Proof of Work?

a$.$

Lower energy utilization

b$.$

Better decentralization

c$.$

Enhance resistance to $51\%$ attacks

d$.$

Faster transaction speedPolkadot Cryptocurrency Consensus Mechanism

Nominated Proof$-$of$-$Stake $($NPoS$)$

Polkadot implements Nominated Proof$-$of$-$Stake $($NPoS$),$ a relatively novel and sophisticated mechanism to select

the validators who are allowed to participate in its consensus protocol. NPoS encourages DOT holders to participate

as nominators.

Any potential validators can indicate their intention to be a validator candidate. Their candidacies are made public to

all nominators, and a nominator, in turn, submits a list of up to $16$ candidates that it supports, and the network will

automatically distribute the stake among validators in an even manner so that the economic security is maximized.

In the next era, a certain number of validators having the most DOT backing get elected and become active. For

more information about the election algorithm go to this page on the wiki or this research article. As a nominator, a

minimum of $250$ DOT is required to submit an intention to nominate, which can be thought of as registering to be a

nominator. Note that in NPoS the stake of both nominators and validators can be slashed. For an in$-$depth review of

NPoS see this research article.

MINIMUM NOMINATION TO RECEIVE STAKING REWARDS

Although the minimum nomination intent is $250$ DOT, it does not guarantee staking rewards. The nominated

amount has to be greater than minimum active nomination, which is a dynamic value that can be much higher

than $250$ DOT. This dynamic value depends on the amount of DOT being staked, in addition to the selected

nominations.

Note: Each question carries $1$ Mark

Question $1$: Having read the excerpt above, choose a consensus mechanism relatively similar

to that used by Polkadot from options below:

a$.$

Proof$-$of$-$work

b$.$ Proof$-$of$-$stake

c$.,$ Delegated proof$-$of$-$stake

d$.$ Proof$-$of$-$Capacity

Question $2$: Why would Polkadot choose Proof$-$of$-$Stake over Proof of Work?

a$.$ Lower energy utilization

b$.$ Better decentralization

c$.$ Enhance resistance to $51\%$ attacks

d$.$ Faster transaction speed