NIP-73
======

External Content IDs
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`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 [ISANs](https://en.wikipedia.org/wiki/International_Standard_Audiovisual_Number)

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", "isbn:9780765382030"]` - https://isbnsearch.org/isbn/9780765382030

Book ISBNs MUST be referenced _**without hyphens**_ as many book search APIs return the ISBNs without hyphens. Removing hypens from ISBNs is trivial, whereas adding the hyphens back in is non-trivial requiring a library.

### Podcasts:

- Podcast RSS Feed GUID: `["i", "podcast:guid:c90e609a-df1e-596a-bd5e-57bcc8aad6cc"]` - https://podcastindex.org/podcast/c90e609a-df1e-596a-bd5e-57bcc8aad6cc
- Podcast RSS Item GUID: `["i", "podcast:item:guid:d98d189b-dc7b-45b1-8720-d4b98690f31f"]`
- Podcast RSS Publisher GUID: `["i", "podcast:publisher:guid:18bcbf10-6701-4ffb-b255-bc057390d738"]`

### Movies:

- Movie ISAN: `["i", "isan:0000-0000-401A-0000-7"]` - https://web.isan.org/public/en/isan/0000-0000-401A-0000-7

Movie ISANs SHOULD be referenced  _**without the version part**_ as the versions / edits of movies are not relevant. More info on ISAN parts here -  https://support.isan.org/hc/en-us/articles/360002783131-Records-relations-and-hierarchies-in-the-ISAN-Registry

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### Optional URL Hints

Each `i` tag MAY have a url hint as the second argument to redirect people to a website if the client isn't opinionated about how to interpret the id:

`["i", "podcast:item:guid:d98d189b-dc7b-45b1-8720-d4b98690f31f", https://fountain.fm/episode/z1y9TMQRuqXl2awyrQxg]`

`["i", "isan:0000-0000-401A-0000-7", https://www.imdb.com/title/tt0120737]`