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NIP-XX
======
External Content IDs
-------------------------
`draft` `optional`
There are certain established global content identifiers that would be useful to reference in nostr events so that clients can query all events assosiated with these ids.
- Book [ISBNs](https://en.wikipedia.org/wiki/ISBN)
- Podcast [GUIDs](https://podcastnamespace.org/tag/guid)
- Movie [EIDRs](https://www.eidr.org)
Since the `i` tag is already used for similar references in kind-0 metadata events it makes sense to use it for these content ids as well.
## Supported IDs
### Books:
- Book ISBN: `["i", "book:isbn:123"]`
### Podcasts:
- Podcast Feed GUID: `["i", "podcast:guid:123"]`
- Podcast Item GUID: `["i", "podcast:item:guid:123"]`
### Movies:
- Movie EIDR: `["i", "movie:eidr:123"]`
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