Proof of Burn (PoB) is not a consensus mechanism used in blockchain networks. It is a method of destroying cryptocurrency tokens to demonstrate commitment to the network.

In a Proof of Work (PoW) consensus mechanism, miners are responsible for solving complex mathematical puzzles to validate transactions and add new blocks to the blockchain.

One of the key advantages of the Proof of Stake (PoS) consensus mechanism is its significantly reduced energy consumption compared to Proof of Work (PoW), as it does not require intensive computational power for mining.

In a Delegated Proof of Stake (DPoS) consensus mechanism, token holders elect representatives (known as delegates) to validate transactions and maintain the blockchain on their behalf.

Proof of Authority (PoA) is commonly used in permissioned blockchain networks, where participants are known and trusted. It relies on a set of pre-approved validators to validate transactions and maintain the blockchain.

In a Proof of Elapsed Time (PoET) consensus mechanism, the next block creator is determined by measuring the time elapsed since the last block was created. The node that has waited the longest is selected to create the next block.

GHOST (Greedy Heaviest Observed Sub-Tree) is a consensus mechanism designed to be resistant to attacks by large mining pools or cartels. It selects the longest chain based on the cumulative weight of the blocks, rather than just the length of the chain.

The Bitcoin blockchain uses the Proof of Work (PoW) consensus mechanism, where miners compete to solve complex mathematical puzzles to validate transactions and add new blocks to the blockchain.

In a Proof of Stake (PoS) consensus mechanism, the primary factor that determines a node's chance of creating the next block is the amount of stake held by the node.

Byzantine Fault Tolerance (BFT) is known for its fast transaction processing times and high scalability. It can tolerate up to one-third of the network participants acting maliciously or failing.

The Ethereum blockchain currently uses the Proof of Work (PoW) consensus mechanism, but it is transitioning to a Proof of Stake (PoS) consensus mechanism known as Casper.

In a Delegated Proof of Stake (DPoS) consensus mechanism, delegates are selected to validate transactions and maintain the blockchain through a voting process, where token holders vote for the delegates they trust.

All of the mentioned consensus mechanisms (Proof of Work, Proof of Stake, Delegated Proof of Stake, Proof of Authority, and Proof of Elapsed Time) are designed to prevent double-spending in a blockchain network by ensuring that each transaction is validated and recorded only once.

Proof of Authority (PoA) is commonly used in private blockchain networks, where participants are known and trusted. It relies on a set of pre-approved validators to validate transactions and maintain the blockchain.

In a Proof of Work (PoW) consensus mechanism, the primary purpose of mining is to validate transactions and add new blocks to the blockchain. Miners compete to solve complex mathematical puzzles to earn the right to add the next block to the blockchain.