Page 114 - Handbook of Deep Learning in Biomedical Engineering Techniques and Applications

102 Chapter 4 A critical review on using blockchain technology in education domain

Table 4.4 Comparison of consensus protocols.

Consensus Smart Suitability for e- BC
algorithm Pros Cons contracts governance platforms

PoW Less opportunity for Greater energy No Currently used; less suitable Bitcoin
51% attack consumption
Better security Centralization of
Tolerates upto 25% miners
PoS Energy efficient Nothing-at-stake Yes Currently used; less suitable NXT,
More decentralized problem Ethereum
Tolerates upto 51%
DPoS Energy efficient Partially No Better than PoS Lisk
Scalable centralized
Increased security Double spend
Tolerates upto 51% attack
lPoS Fair usage Decentralization Yes Better than PoS Waves
Lease coins issue
PoET Cheap participation Need for Yes Better than PoS Hyperledger
specialized Sawtooth
hardware
Not good for public
blockchain
PoA Reduces the Greater energy Yes Currently used Decred
probability of the consumption
51% attack Double signing
Equal contribution
PoI Vesting Decentralization Yes Not suitable NEM
Transaction issue
partnership
PoC Cheap Favoring bigger Yes Not suitable Burstcoin
Efficient fishes
Distributed Decentralization
issue
PoBi Preservation of the Not for short-term No Not suitable Slimcoin
network investors
Wasting coins
PoWeight Scalable Issue with Yes Not suitable Filecoin
Customizable incentivization
PBFT No need for Communication Yes Better than proof of methods Hyperledger
confirmation gap Fabric
Reduction in energy Sybil attack
Tolerates upto 33.3%