In the previous article, Creating a Blockchain Using JavaScript, you learned how to create a simple blockchain application in JavaScript.

Proof-of-Work is one of the most common needs of a blockchain that approves and validates any transactions occurring on the blockchain. We can say, Proof-of-Work, or PoW, is the original consensus algorithm in a Blockchain network.

In Blockchain, this algorithm is used to confirm the transactions and produce new blocks to the chain. With PoW, miners compete against each other to complete transactions on the network and get rewarded. (Ref: https://cointelegraph.com/explained/proof-of-work-explained )
In the following video, Zulfikar Ramzan, a world-leading expert in computer security and cryptography and is currently the Chief Scientist at Sourcefire explains the bitcoin proof of work.

A proof-of-work can be implemented in a blockchain using various programming languages, depending on the project. In this video, developer expalins the basic concent of Proof-of-Work functionality and how to add it to a blockchain using JavaScript.

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