What does a P2Pool side chain mean?

A P2Pool side chain is a separate record that tracks miners’ contributions so they can share Monero mining rewards fairly. It runs alongside Monero’s main blockchain, but it is not another coin and does not hold your XMR. Think of it as a shared work log rather than a wallet.

Why P2Pool needs a separate record

When you mine with other people, you need a way to show how much work each person contributed. A traditional mining pool uses a central operator’s records to decide who gets paid.

P2Pool replaces that private record with a side chain: a sequence of records that participating computers share and check together. Each record is called a share.

A share proves that a miner completed some valid mining work. It is easier to produce than a full Monero block, so the group can record contributions without waiting for someone to win a reward on Monero’s main network.

P2Pool aims to produce a side-chain share about every 10 seconds. That is separate from Monero’s roughly two-minute block time.

How shares connect to real XMR rewards

Your mining software repeatedly tries calculations, looking for a result that meets a required target. That target is called difficulty.

There are two relevant targets:

• P2Pool’s share target: Meeting this lets your contribution become a share on the side chain.
• Monero’s network target: Meeting this harder target produces a candidate Monero block that can earn an actual mining reward.

A result that meets only the share target does not create XMR. It records work that may qualify you for part of a later reward.

When a miner finds a block that Monero accepts, its reward is split among eligible miners according to the recent shares recorded on that P2Pool side chain. The payment goes directly to their Monero wallets through the block’s reward transaction. There is no pool operator holding a balance for you to withdraw.

What the payout window means for you

P2Pool uses PPLNS, short for “pay per last N shares.” In everyday terms, rewards depend on your recorded work within a rolling window of recent shares.

This matters because a share is not a promise of payment:

• Your share needs to be included in the eligible side-chain history.
• That side chain needs to find a Monero block while your share is in the payout window.
• Once your share leaves that window, it no longer counts toward future rewards.

Finding shares regularly can make participation steadier, but it does not guarantee a daily payout. Newly mined Monero rewards also remain locked for 60 Monero blocks before you can spend them.

Why different P2Pool side chains exist

You may see options such as P2Pool main, mini, or nano. These are separate work-sharing groups with their own side-chain histories and share difficulties. They all mine the same Monero currency.

A lower-difficulty group can make it easier for you to find shares with a slower computer. However, a group with less total mining power generally finds Monero blocks less often. Easier shares do not automatically mean higher earnings.

Your Monero node checks the main Monero blockchain. Your P2Pool software separately checks the chosen side chain and uses its records to calculate reward splits.

The bottom line

A P2Pool side chain is the group’s publicly checked work log. It records who contributed mining work, while Monero’s main blockchain creates and delivers the actual XMR rewards.