# Libbitcoin for Core people

**URL:** <https://delvingbitcoin.org/t/libbitcoin-for-core-people/1222>\
**Category:** Implementation\
**Tags:** libbitcoin\
**Created:** [October 28, 2024, 7:09pm UTC](https://delvingbitcoin.org/t/libbitcoin-for-core-people/1222 "2024-10-28T19:09:55Z")\
**Posts on this page:** 1\
**Showing post:** 30

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**Author:** ![andrewtoth](https://delvingbitcoin.org/user_avatar/delvingbitcoin.org/andrewtoth/32/576_2.png) [@andrewtoth](https://delvingbitcoin.org/u/andrewtoth)\
**Post date:** [December 2, 2024, 8:03pm UTC](https://delvingbitcoin.org/t/libbitcoin-for-core-people/1222/30 "2024-12-02T20:03:17Z")

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I don’t see how checking if an input exists could be done without chain context.

> [@evoskuil](#):
>
> However you are referring to lookup of previous outputs, not inputs. I was asking why there is an input fetch.

It is fetching the previous outputs of the inputs.

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