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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.

What Is a ‘Data Integrity’ Issue for Oracles?
How Does a Mining Pool Divide the Work of Finding a Valid Nonce?
What Is the Concept of ‘Stale Shares’ and How Do They Affect a Miner’s Profitability?
What Is the Potential for ‘Share Manipulation’ and How Is It Prevented?