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What Does ‘N’ Represent in the PPLNS Fee Structure?

'N' in Pay-Per-Last-N-Shares represents the number of shares in the last "window" or "round" of mining that will be considered for a payout when a block is found. This 'N' is typically set to be much larger than the expected number of shares needed to find a block.

It is a moving window that ensures miners who leave the pool immediately after a block is found do not receive a disproportionate share of the next block's reward.

How Does a Pool’s Luck Factor Influence the PPLNS Payout Model?
Why Does Pay-Per-Last-N-Shares (PPLNS) Often Have Lower Fees than PPS?
How Does a Shorter Block Time on a Blockchain Affect the Window of Opportunity for Front-Running?
How Does a Pool’s Payout Method (E.g. PPS) Utilize the Share Count?