Consensus mechanisms are the rules that determine how blockchain networks agree on the state of the ledger.
1. Proof of Work (PoW)
| Aspect | Details |
|---|
| How it works | Miners solve complex mathematical puzzles |
| Energy Usage | Very high |
| Security | Extremely secure |
| Speed | Slower transaction processing |
| Examples | Bitcoin, Litecoin, Dogecoin |
| Hardware Required | Specialized mining equipment (ASICs, GPUs) |
| Reward | Block rewards + transaction fees |
2. Proof of Stake (PoS)
| Aspect | Details |
|---|
| How it works | Validators stake coins as collateral |
| Energy Usage | Very low |
| Security | Secure with economic incentives |
| Speed | Faster transaction processing |
| Examples | Ethereum, Cardano, Polkadot |
| Hardware Required | Standard computer |
| Reward | Staking rewards + transaction fees |
3. Delegated Proof of Stake (DPoS)
| Aspect | Details |
|---|
| How it works | Token holders vote for delegates to validate |
| Energy Usage | Low |
| Security | Democratic but can centralize |
| Speed | Very fast |
| Examples | EOS, TRON, Lisk |
4. Proof of History (PoH)
| Aspect | Details |
|---|
| How it works | Creates a historical record proving time passage |
| Energy Usage | Low |
| Security | Secure with time verification |
| Speed | Extremely fast (65,000+ TPS) |
| Examples | Solana |
5. Proof of Authority (PoA)
| Aspect | Details |
|---|
| How it works | Approved validators with known identities |
| Energy Usage | Very low |
| Security | Relies on validator reputation |
| Speed | Fast |
| Examples | VeChain, some private blockchains |
6. Other Consensus Mechanisms:
- Proof of Burn (PoB) – Coins are burned to earn mining rights
- Proof of Space/Storage – Uses storage capacity for consensus
- Proof of Elapsed Time (PoET) – Random waiting time for fairness
- Byzantine Fault Tolerance (BFT) – Tolerates malicious nodes
🔗 Types of Blockchains
| Type | Access | Speed | Decentralization | Examples |
|---|
| Public | Open to everyone | Moderate | Fully decentralized | Bitcoin, Ethereum |
| Private | Restricted access | Fast | Centralized | Hyperledger |
| Consortium | Group of organizations | Fast | Semi-decentralized | R3 Corda |
| Hybrid | Mix of public/private | Varies | Partial | Dragonchain |
