What Is the Difference between a ‘Valid Share’ and an ‘Invalid Share’?

A 'valid share' is a proof-of-work submitted by a miner that meets the pool's difficulty target and is submitted before a block is found. An 'invalid share' is one that fails the pool's validation checks, often due to incorrect data, high latency (stale share), or submission after the pool has already solved the block.

Invalid shares earn no reward.

How Is the Difficulty of a pool’S’share’ Target Set Relative to the Network Difficulty?
How Does the Concept of a “Block Race” Relate to the Generation of Stale Shares?
How Does the Distance between the Miner and the Pool Server Affect the Stale Share Rate?
Does a Pool Operator Benefit from a High Number of Stale Shares Submitted by Miners?
What Is the Risk of Setting the Pool Share Difficulty Too Low?
Why Is the Probability of a Single Share Being a Valid Block Extremely Low?
What Happens If a Miner Submits a Share That Meets the Network Difficulty but Not the Pool’s Target Difficulty?
Why Is It Important for a Pool Operator to Detect and Reject “Invalid Shares”?

Glossar