Cryptocurrencies were created to solve issues within centralized systems, such as slow processing times, high fees, and centralized authorities, such as banks, having too much control over user funds.

However, one of the key challenges that kept cryptocurrencies behind for years is the issue of “double spending,” or spending the same amount of digital money twice.

This issue was resolved, through the introduction of a consensus mechanism.

Today, there are numerous consensus mechanisms utilized across the blockchain space, however, out of them, two specifically stand out, and these include the Proof-of-Work (PoW) consensus mechanism and the Proof-of-Stake (PoS) consensus mechanism.

As such, today, we will be going over everything you need to know surrounding these consensus models.

Proof-of-Work (PoW) Explained

Proof-of-Work (PoW) is a consensus model where miners need to contribute processing power as well as electricity, where through expensive hardware, they put machines to work with the goal of solving cryptographic puzzles to verify a transaction.

Proof-of-Work (PoW) is one of the most popular types of consensus mechanisms due to the fact that it was introduced and is now being utilized within the Bitcoin (BTC) network with the “Bitcoin: A Peer-to-Peer Electronic Cash System” whitepaper.

Through this consensus model, cryptocurrency miners essentially generate a hash that matches a target hash of the current block. In this case, the hash is a long string of characters, and all of the miners compete against one another to confirm a specific transaction or submit a block on the network.

The miner that ends up winning and adding the block to the blockchain is rewarded in the form of the network’s native cryptocurrency. BTC is the native coin behind Bitcoin. This PoW algorithm then generates a hash for a block and uses SHA-256 as its model. Throughout time, the mining difficulty increases, and the amount of BTC received per block gets halved. This is known as Bitcoin halving.

Also Read: Kadena (KDA) – A Scalable Layer 1 PoW Blockchain

Proof-of-Stake (PoS) Explained

Proof-of-Stake (PoS) is an alternative consensus mechanism where the owners of specific cryptocurrencies native to the blockchain network in question can essentially stake their coins. Through doing so, they have the right to check each new block of transactions that enters the network and are incentivized to do so by receiving staking rewards.

Within this PoS mechanism, instead of using hardware and electricity to process transactions, owners of cryptocurrencies can essentially stake their coins. This provides them with the ability to check the new blocks of transactions before they are added to the blockchain.

Staking is essentially a procedure in which the owner of the native cryptocurrency is required to have a specified amount of coins in their wallet. Once they have that amount, they can pledge them, and as such, they can begin processing the transactions through a verification procedure.

In a majority of blockchains that utilize PoS, when a block of transactions needs to be processed, the cryptocurrency’s protocol then determines which validator can review the block, which is based on the number of coins that they have staked. The validator has the main role of checking if the transactions in the block are accurate.

If they are, they get added to the blockchain. Once the procedure is fully completed, the validators get rewarded in the form of the project’s native cryptocurrency.

Those who are bad, and do not correctly verify the data, are discouraged from operating on the network, where they will lose a percentage of their staked holdings as a penalty for misbehaving.

Proof-of-Work (PoW) vs. Proof-of-Stake (PoS): Main Differences

There are numerous differences when it comes to Proof-of-Work (PoW) and Proof-of-Stake (PoS).

Specifically, PoW requires miners to buy expensive hardware, and this can be in the form of Graphics Processing Units (GPUs) or even Application-Specific Integrated Circuit (ASIC) Miners, which are machines that specialize in mining, and all of this aims to confirm transactions by solving cryptographic puzzles, which can take a lot of electricity to power.

In PoW, the miner that solves the cryptographic target hash first is the one that adds a block to the network and earns rewards, and this gives a high level of competition within the sector.

There is a high level of security, and decentralization, due to the fact that each of the mining units is spread out globally. PoW has also proven to be effective when it comes to the prevention of double-spending.

However, PoS does not require this hardware and introduces an eco-friendly alternative known as staking. This puts cryptocurrencies to use and does not put the environment at risk as much as PoW does.

Any member of the network that has a sufficient balance of the network’s native cryptocurrency can stake it and become a validator in the network. This means that the procedure of verifying transactions is a lot more accessible.

PoS miners do not need to spend too much money on mining equipment and do not have to worry about spending too much electricity in the process.

PoW uses a lot of electricity, is expensive, is not beginner-friendly, and is not as efficient as the competition, resulting in higher transaction fees and slower transaction times.

PoS also has disadvantages, as it has been criticized as being more centralized than PoW, and some PoS implementations feature a lock-up period, where cryptocurrencies cannot get unstaked or used for different purposes.

Also Read: Zero Knowledge Proofs (ZKPs) and ZK-Rollups in Crypto: Everything You Need to Know

Moving Forward With Consensus Mechanisms: Which One Is The Future?

Numerous blockchain-based projects have introduced variations of these consensus mechanisms, and some even created alternatives. However, these are the two primary consensus mechanisms utilized by a majority of projects within the crypto space.

These are proven and time-tested consensus mechanisms, and it is likely that they will remain relevant within the blockchain space for years to come.

In any case, both Proof-of-Work (PoW) and Proof-of-Stake (PoS) are solid options for projects, and each of them comes with its own pros, as well as its own cons.