What is proof of work in Monero?

Proof of work in Monero is a way to make adding new transactions to its shared record require real computing effort. Your computer tries many calculations to find a valid result, and other computers can quickly check that result. This helps Monero agree on payment history without a bank or central company in charge.

What work is your computer doing?

Monero stores its payment history in a blockchain: a shared record made of batches of transactions called blocks. Mining is the process of competing to add the next block.

When you mine, your computer builds or receives a proposed block and repeatedly runs a calculation on it, changing a small input each time. Each attempt produces a hash, a digital result derived from the input.

A block qualifies only if its hash meets the network’s current target. Think of it as drawing numbers until you get one low enough to qualify. There is no guaranteed number of attempts before you succeed.

The useful distinction is:

• Finding a qualifying result takes work. You usually need many attempts.
• Checking that result is quick. Other computers do not have to repeat every failed attempt.

That difference makes proof of work practical.

How Monero sets the challenge

Monero uses RandomX, its proof-of-work algorithm—the rules that define the calculation miners must perform. RandomX replaced Monero’s earlier CryptoNight variants on November 30, 2019.

RandomX favors CPUs, the general-purpose processors inside everyday computers. It combines varied calculations with memory use to reduce the advantage of specialized mining machines. That does not mean every computer performs equally well: processor design, available memory, and cooling all matter.

Monero aims for one new block about every two minutes across the whole network, not one block per miner. Actual gaps vary because finding a valid result involves chance.

The network adjusts difficulty, the measure of how hard it is to find an acceptable result, after every block. If more computing power joins, difficulty generally rises. This keeps blocks from arriving steadily faster as mining power grows.

Why this helps protect your payments

Computers checking Monero’s rules, called nodes, verify both the proof of work and the proposed block’s transactions. A valid proof does not give a miner permission to create invalid payments or spend someone else’s money.

If competing valid histories appear, nodes favor the one with the most accumulated proof of work. Replacing recent payment history therefore requires an attacker to redo work and outpace the honest network.

This makes attacks costly, not impossible. Controlling most of the mining power could let an attacker disrupt confirmations or attempt to reverse their own payments. It would not let them simply take coins from your wallet.

What this means when you mine

Your reward is for contributing computing work, not for lending Monero or keeping a browser tab open by itself. Browser mining must actually perform valid mining work to contribute.

Monero currently creates 0.6 XMR per block through its ongoing “tail emission,” plus transaction fees for the successful miner. If you join a mining pool—a group sharing work and rewards—you receive a share under its rules.

Your computer still uses electricity and produces heat. Proof of work does not promise a profit.

The bottom line

Monero’s proof of work makes valid blocks costly to produce but easy to check. You contribute computing effort; the network uses that effort, together with strict transaction rules, to maintain a shared payment history.