> For the complete documentation index, see [llms.txt](https://docs.xchandles.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.xchandles.com/techincal-manual/xchandles/the-oracle-action.md).

# The Oracle Action

*Note*: The oracle action code be found [here](https://github.com/Yakuhito/slot-machine/blob/master/rue-puzzles/actions/xchandles/oracle.rue) ([Chialisp](https://github.com/Yakuhito/slot-machine/blob/master/puzzles/actions/xchandles/oracle.clsp)).

CATalog registrations are forever, which allows one to use uniqueness prelauncher to allow quick on-chain and off-chain validation that an NFT indeed represents the entry for a given CAT. XCHandles, on the other hand, has expiring handles - everyone is free to set the resolved launcher id to any singleton, and entries can expire. The oracle is a very simple action that will announce the value of a given slot on-chain. The announcement prefix, `o`, is concatenated with the slot's value hash. It's simple as that!

*Written by* [*yakuhito*](https://x.com/yakuhito) *from* [*FireAcademy.io*](https://fireacademy.io/) *on Feb 15th, 2025.*


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