nBits, Target Threshold
This definition comes from the technical glossary.
Definition
The target is the threshold below which a block header hash must be in order for the block to valid, and nBits is the encoded form of the target threshold as it appears in the block header.
Synonyms
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nBits
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Target
Not To Be Confused With
- Difficulty (a number measuring the difficulty of finding a header hash relative to the difficulty of finding a header hash with the easiest target)
Links
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Target — Developer Guide
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nBits — Developer Reference
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Target — Bitcoin Wiki
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How is the target section of the block header calculated? — Bitcoin StackExchange