---
# This file is licensed under the MIT License (MIT) available on
# http://opensource.org/licenses/MIT.

required:
                                           #-------------40 characters-------------#
    title_max_40_characters_no_formatting: Null Data (OP_RETURN) Transaction

    summary_max_255_characters_no_formatting: >
        A standard transaction type which allows adding 40 bytes of
        arbitrary data to the block chain up to once per transaction.

    synonyms_shown_in_glossary_capitalize_first_letter:
        - Null data transaction
        - OP_RETURN transaction
        - Data carrier transaction

optional:
    synonyms_and_pluralizations_not_shown_in_glossary:
        - null data transactions
        - op_return transactions
        - data carrier transactions

    not_to_be_confused_with_capitalize_first_letter:
        - OP_RETURN (an op code used in one of the outputs in an OP_RETURN transaction)

    links_html_or_markdown_style_capitalize_first_letter:
        - "[Null data transaction](/en/developer-guide#term-null-data) --- Bitcoin.org Developer Guide"
        - "[Pull request implement null data transactions](https://github.com/bitcoin/bitcoin/pull/2738) --- GitHub"

---