Zuri Ozeomachukwu Njoku Explains 6 Consensus Algorithms That Power Blockchain Networks
                     Zuri 
Ozeomachukwu 
ENxjpolkauins 6 
Consensus 
Algorithms That 
Power Blockchain 
Networks
Blockchain networks work without a central authority like a bank or 
government. So how do they make sure every transaction is correct? The 
answer is consensus algorithms. These are rules that help all computers in 
a blockchain network agree on what is true. Zuri Ozeomachukwu Njoku 
explains six common consensus algorithms in simple terms.
1. Proof of Work 
(PrPooof oWf Wo)rk is the oldest consensus 
method and is used by Bitcoin. In this 
system, computers called miners compete 
to solve difficult math problems. The first 
one to solve the problem gets to add a 
new block to the blockchain.
This method is very secure, but it uses a 
lot of electricity. That is why many people 
look for better alternatives.
2. Proof of Stake 
(PoS)
Proof of Stake is more energy-friendly. 
Instead of solving puzzles, participants 
lock up some of their cryptocurrency as a 
stake. These participants are called 
validators.
The more coins a validator stakes, the 
higher their chance of adding a new 
block. PoS is faster and cheaper to run 
than Proof of Work.
3. Delegated Proof 
of Stake (DPoS)
Delegated Proof of Stake adds voting to the 
process. Token holders vote for a small group of 
trusted representatives called delegates.
These delegates handle transaction validation 
on behalf of everyone. This system is very fast 
and efficient, but it gives more power to a 
smaller group of people.
4. Proof of Authority 
(PoA)
Proof of Authority depends on trust. Only 
approved and known validators can add new 
blocks to the blockchain. Their real-world 
identity and reputation are at stake.
This method is mostly used in private or 
business blockchains where participants 
already trust each other. It is fast, but not 
very decentralized.
5. Practical 
Byzantine Fault 
Tolerance (PBFT)
PBFT is designed to keep the network 
running even if some participants act 
dishonestly. Nodes communicate with 
each other to agree before accepting 
transactions.
This system works well for smaller, 
private blockchains but can become slow 
if too many nodes are involved.
6. Proof of 
Elapsed Time 
(PrPooof oEf ETla)psed Time uses a fair 
waiting system. Each participant waits 
for a randomly chosen amount of 
time. The one whose wait time ends 
first gets to create the next block.
PoET saves energy, but it often needs 
special hardware, which limits where 
it can be used.
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