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Null data transaction
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<div class="subhead-links sourcefile" data-sourcefile="_data/glossary/en/null-data-transaction.yaml"
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<h1 id="null-data-opreturn-transaction">Null Data (OP_RETURN) Transaction</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>A transaction type that adds arbitrary data to a provably unspendable <a href="/en/glossary/pubkey-script" title="A script included in outputs which sets the conditions that must be fulfilled for those duffs to be spent. Data for fulfilling the conditions can be provided in a signature script. Pubkey Scripts are called a scriptPubKey in code." class="auto-link">pubkey script</a> that full <a href="/en/glossary/node" title="A computer that connects to the Dash network." class="auto-link">nodes</a> don’t have to store in their <a href="/en/glossary/unspent-transaction-output" title="An Unspent Transaction Output (UTXO) that can be spent as an input in a new transaction." class="auto-link">UTXO</a> database.</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>Null data transaction</p>
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</li>
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<li>
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<p>OP_RETURN transaction</p>
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</li>
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<li>
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<p>Data carrier transaction</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>OP_RETURN (an <a href="/en/glossary/op-code" title="Operation codes from the Dash Script language which push data or perform functions within a pubkey script or signature script." class="auto-link">opcode</a> used in one of the <a href="/en/glossary/output" title="An output in a transaction which contains two fields: a value field for transferring zero or more duffs and a pubkey script for indicating what conditions must be fulfilled for those duffs to be further spent." class="auto-link">outputs</a> in an <a href="/en/glossary/null-data-transaction" title="A transaction type that adds arbitrary data to a provably unspendable pubkey script that full nodes don't have to store in their UTXO database." class="auto-link">OP_RETURN transaction</a>)</li>
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</ul>
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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-null-data">Null data transaction</a> — Developer Guide</p>
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</li>
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<li>
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<p><a href="https://github.com/bitcoin/bitcoin/pull/2738">Pull request implement null data transactions</a> — GitHub</p>
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