Header Chain, Best Header Chain
This definition comes from the technical glossary.
Definition
A chain of block headers with each header linking to the header that preceded it; the most-difficult-to-recreate chain is the best header chain
Synonyms
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Header chain
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Best header chain
Not To Be Confused With
Links
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Header chain — Bitcoin.org Developer Guide
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Is it a chain of headers rather than a chain of blocks? — Bitcoin StackExchange