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What is blockchain consensus mechanism?

6 cited papers · March 16, 2026 · Powered by Researchly AI

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A blockchain consensus mechanism is a distributed algorithm applied in blockchain networks to enable nodes to agree on the validity of transactions and the stat…

A blockchain consensus mechanism is a distributed algorithm applied in blockchain networks to enable nodes to agree on the validity of transactions and the state of the ledger.¹Consensus algorithms improve fault tolerance in distributed computer systems, and the explosive development of distributed ledger technology following Bitcoin led to a sharp increase in research activity in this area.¹²

1

Sybil in the Haystack: A Comprehensive Review of Blockchain Consensus Mechanisms in Search of Strong Sybil Attack ResistanceMoritz Platt, Peter McBurney2023Algorithms

2

A Comprehensive Review of Blockchain Consensus MechanismsBahareh Lashkari, Petr Musı́lek2021IEEE Access

Proof-of-Work (PoW) — A consensus mechanism requiring nodes to expend significant computational power to mine blocks; it is energy-intensive and offers only probabilistic finality guarantees.

¹²³

1

SklCoin: Toward a Scalable Proof-of-Stake and Collective Signature Based Consensus Protocol for Strong Consistency in BlockchainZakwan Jaroucheh, Baraq Ghaleb et al.2020arXiv

2

Proof of Previous Transactions (PoPT): An Efficient Approach to Consensus for JCLedgerXiang Fu, Huaimin Wang et al.2019IEEE Transactions on Systems Man and Cybernetics Systems

3

Theoretical Analysis on Block Time Distributions in Byzantine Fault-Tolerant Consensus BlockchainsAkihiro Fujihara2024arXiv

Proof-of-Stake (PoS) — A greener alternative to PoW where validators are selected based on their stake; it reduces energy consumption but is susceptible to long-range attacks.

⁴¹

4

A Survey on Long-Range Attacks for Proof of Stake ProtocolsEvangelos A. Deirmentzoglou, Georgios Papakyriakopoulos et al.2019IEEE Access

Byzantine Fault Tolerance (BFT) — A class of consensus protocols designed to function correctly even when some nodes behave maliciously or fail arbitrarily; PBFT-based algorithms are a prominent example.

²¹³

Sybil Attack Resistance — A critical property of public, permissionless blockchain consensus mechanisms, requiring robust leader selection strategies to prevent attackers from presenting bogus identities to induce faults.

¹³

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Diagram

 BLOCKCHAIN CONSENSUS PIPELINE
 ================================

 [User / Application Layer]
 |
 | (Transaction Submitted)
 v
 +---------------------+
 | Transaction Pool | <-- Unconfirmed transactions
 | (Mempool) | broadcast to all nodes
 +---------------------+
 |
 | (Broadcast via P2P Network)
 v
 +-------------------------------+
 | Node / Validator Layer |
 | +----------+ +----------+ |
 | | Node A | | Node B | |... N nodes
 | | (Miner / | | (Miner / | |
 | | Validator)| | Validator)| |
 | +----------+ +----------+ |
 +-------------------------------+
 |
 | (Leader / Miner Selected)
 | PoW --> Solve cryptographic puzzle
 | PoS --> Stake-weighted random selection
 | BFT --> Committee-based voting rounds
 v
 +------------------------------+
 | Block Proposal Stage |
 | - Collect valid txns |
 | - Form candidate block |
 | - Attach previous block hash|
 +------------------------------+
 |
 | (Proposed Block Broadcast)
 v
 +------------------------------+
 | Consensus / Voting Stage |
 | PoW: Other nodes verify |
 | hash puzzle solution |
 | PoS: Validators vote on |
 | proposed block |
 | BFT: Multi-round message |
 | exchange (prepare, |
 | pre-commit, commit) |
 +------------------------------+
 |
 | (Supermajority Agreement Reached)
 v
 +------------------------------+
 | Block Finalization |
 | - PoW: Probabilistic |
 | finality (longest chain) |
 | - PoS/BFT: Immediate or |
 | deterministic finality |
 +------------------------------+
 |
 v
 +------------------------------+
 | Distributed Ledger Update |
 | - Block appended to chain |
 | - All nodes sync state |
 | - Immutable record stored |
 +------------------------------+
 |
 v
 [Confirmed Transaction / State]

Table

Property	Proof-of-Work (PoW)	Proof-of-Stake (PoS)	BFT-Based (e.g., PBFT)
Resource Used	Computational power	Staked tokens	Voting rounds
Finality	Probabilistic	Deterministic/Immediate	Immediate
Energy Use	Very High	Low	Low
Sybil Resistance	Strong	Strong	Moderate
Scalability	Low throughput	Higher throughput	High (small committees)

In BFT-based systems like SklCoin, scalable collective signing is used to commit transactions irreversibly, achieving immediate finality where all miners instantly agree on block validity.¹A comprehensive review of 130 consensus algorithms using a novel architectural classification has been conducted, analyzing their applicability across the top 10 blockchain platforms.²³

1

SklCoin: Toward a Scalable Proof-of-Stake and Collective Signature Based Consensus Protocol for Strong Consistency in BlockchainZakwan Jaroucheh, Baraq Ghaleb et al.2020arXiv

2

A Comprehensive Review of Blockchain Consensus MechanismsBahareh Lashkari, Petr Musı́lek2021IEEE Access

3

Sybil in the Haystack: A Comprehensive Review of Blockchain Consensus Mechanisms in Search of Strong Sybil Attack ResistanceMoritz Platt, Peter McBurney2023Algorithms

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PoW energy waste and low throughput: The proof-of-work consensus protocol suffers from waste of energy and offers only probabilistic guarantees about the status of the blockchain.

¹²

PoS vulnerability to long-range attacks: In PoS protocols, successful long-range attacks may take over the main chain and partially or even completely rewrite the history of transactions stored in the blockchain.

¹

1

SklCoin: Toward a Scalable Proof-of-Stake and Collective Signature Based Consensus Protocol for Strong Consistency in BlockchainZakwan Jaroucheh, Baraq Ghaleb et al.2020arXiv

2

A Comprehensive Review of Blockchain Consensus MechanismsBahareh Lashkari, Petr Musı́lek2021IEEE Access

Blockchain consensus mechanisms enable decentralized agreement on transaction validity across distributed nodes, forming the backbone of blockchain security.

¹²³⁴

PoW is energy-intensive and provides only probabilistic finality, making it unsuitable for high-throughput or energy-sensitive applications.

²

PoS-based and BFT-based mechanisms offer immediate finality and higher transaction rates as alternatives to PoW.

²¹

Public permissionless blockchains require strong Sybil attack resistance, commonly achieved through PoW or PoS principles.

³²⁴

Over 130 distinct consensus algorithms have been proposed, reflecting the diversity of design trade-offs across application domains.

¹

1

A Comprehensive Review of Blockchain Consensus MechanismsBahareh Lashkari, Petr Musı́lek2021IEEE Access

2

SklCoin: Toward a Scalable Proof-of-Stake and Collective Signature Based Consensus Protocol for Strong Consistency in BlockchainZakwan Jaroucheh, Baraq Ghaleb et al.2020arXiv

3

Sybil in the Haystack: A Comprehensive Review of Blockchain Consensus Mechanisms in Search of Strong Sybil Attack ResistanceMoritz Platt, Peter McBurney2023Algorithms

4

Theoretical Analysis on Block Time Distributions in Byzantine Fault-Tolerant Consensus BlockchainsAkihiro Fujihara2024arXiv

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"Comparison of Proof-of-Stake vs Proof-of-Work scalability and security in public blockchains"
"Byzantine Fault Tolerant consensus protocols for permissioned blockchain networks"
"Energy consumption reduction strategies in blockchain consensus mechanisms"

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