Stale Block
This definition comes from the technical glossary.
Definition
Blocks which were successfully mined but which aren’t included on the current best block chain, likely because some other block at the same height had its chain extended first.
Synonyms
- Stale block
Not To Be Confused With
- Orphan block (a block whose previous (parent) hash field points to an unknown block, meaning the orphan can’t be validated)
Links
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Stale blocks — Bitcoin Developer Guide
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What are orphaned and stale blocks? — Bitcoin StackExchange