It is evident that miners perform validation of the transaction and build their own block of transactions. Once they solve the puzzle and create a new valid block, they broadcast it to the blockchain network. This is where the consensus algorithm of the blockchain appears, which will ensure that the blockchain network reaches a consensus about the ordering of the transactions and about whose valid block needs to be added to the blockchain. Remember, the decision about whose block to be considered as the next block on the blockchain also determines the reward to the miner. This is taken care of by consensus algorithms such as PoW or PoS.
Ethereum uses PoW and will move to PoS soon. With PoS being the consensus algorithm ...
