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What is Proof of Work

Proof of Work (PoW) is a blockchain consensus mechanism in which participants perform computational work to validate transactions and create new blocks.

In simple terms, Proof of Work is a system where computers (miners) solve mathematical problems to add blocks to the blockchain and receive rewards.

This mechanism is used in networks such as Bitcoin and provides a high level of security.

How Proof of Work works​

In a Proof of Work system, miners compete to find a valid hash that meets the network’s difficulty requirements.

To achieve this, they repeatedly modify a special value called a nonce.

The process includes:

  • testing many nonce values
  • calculating hashes
  • finding a result that satisfies the network difficulty

This process is known as mining.

For a deeper explanation of hashing and mining, see the hashing and mining guide.

Where Proof of Work is used​

Proof of Work is used in networks such as:

Advantages of Proof of Work​

  • high level of security
  • resistance to attacks (e.g. 51% attack)
  • well-tested technology

Disadvantages​

  • high energy consumption
  • limited scalability
  • slower transaction processing

Learn more about Proof of Work​

A detailed explanation of mining and hashing can be found here:

FAQ​

What is Proof of Work in simple terms?​

It is a system where participants perform computations to validate blocks.

Mining is the process that implements Proof of Work.

Why does Proof of Work consume so much energy?​

Because miners perform a large number of computations to find a valid hash.