Blockchain Fundamentals

Stale Block

Also: Orphan Block

A valid block that lost the race to be added to the chain because another miner found a block at nearly the same moment. It is discarded, and its transactions return to the pool of waiting transactions.

General education, not investment, legal or tax advice. Markets and regulation change quickly: where a definition depends on current law or on a recent event, check the latest coverage before relying on it.