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nBits
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<div class="subhead-links sourcefile" data-sourcefile="_data/glossary/en/nbits.yaml"
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<br>
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<h1 id="nbits-target-threshold">nBits, Target Threshold</h1>
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<p><span>This definition comes from the <a href="/en/developer-glossary">technical glossary</a>.</span></p>
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<h2 id="definition">Definition</h2>
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<p>The <a href="/en/glossary/nbits" title="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." class="auto-link">target</a> is the threshold below which a <a href="/en/glossary/block-header" title="An 80-byte header belonging to a single block which is hashed repeatedly to create proof of work." class="auto-link">block header</a> hash must be in order for the <a href="/en/glossary/block" title="One or more transactions prefaced by a block header and protected by proof of work. Blocks are the data stored on the block chain." class="auto-link">block</a> to valid, and <a href="/en/glossary/nbits" title="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." class="auto-link">nBits</a> is the encoded form of the <a href="/en/glossary/nbits" title="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." class="auto-link">target threshold</a> as it appears in the <a href="/en/glossary/block-header" title="An 80-byte header belonging to a single block which is hashed repeatedly to create proof of work." class="auto-link">block header</a>.</p>
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<h3 id="synonyms">Synonyms</h3>
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<ul>
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<li>
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<p>nBits</p>
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</li>
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<li>
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<p>Target</p>
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</li>
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</ul>
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<h3 id="not-to-be-confused-with">Not To Be Confused With</h3>
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<ul>
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<li><a href="/en/glossary/difficulty" title="How difficult it is to find a block relative to the difficulty of finding the easiest possible block. The easiest possible block has a proof-of-work difficulty of 1." class="auto-link">Difficulty</a> (a number measuring the <a href="/en/glossary/difficulty" title="How difficult it is to find a block relative to the difficulty of finding the easiest possible block. The easiest possible block has a proof-of-work difficulty of 1." class="auto-link">difficulty</a> of finding a <a href="/en/glossary/block-header" title="An 80-byte header belonging to a single block which is hashed repeatedly to create proof of work." class="auto-link">header</a> hash relative to the <a href="/en/glossary/difficulty" title="How difficult it is to find a block relative to the difficulty of finding the easiest possible block. The easiest possible block has a proof-of-work difficulty of 1." class="auto-link">difficulty</a> of finding a <a href="/en/glossary/block-header" title="An 80-byte header belonging to a single block which is hashed repeatedly to create proof of work." class="auto-link">header</a> hash with the easiest <a href="/en/glossary/nbits" title="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." class="auto-link">target</a>)</li>
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<h3 id="links">Links</h3>
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<ul>
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<li>
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<p><a href="/en/developer-guide#term-target">Target</a> — Developer Guide</p>
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</li>
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<li>
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<p><a href="/en/developer-reference#target-nbits">nBits</a> — Developer Reference</p>
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</li>
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<li>
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<p><a href="https://en.bitcoin.it/wiki/Target">Target</a> — Bitcoin Wiki</p>
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</li>
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<li>
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<p><a href="http://bitcoin.stackexchange.com/q/23912">How is the target section of the block header calculated?</a> — Bitcoin StackExchange</p>
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