According to Investopedia, A consensus mechanism is a fault-tolerant mechanismthat is used in computer and blockchain systems to achieve the necessary agreement on a single data value or a single state of the network among distributed processes or multi-agent systems.
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1. Consensus Mechanism in blockchain
2. Proof of Work
3. Proof of Stake
4. Proof of Elapsed Time
5. Byzantine Fault Tolerance
6. Proof of Burn