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NIP-73 - External Content IDs
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24.md
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@ -40,4 +40,5 @@ tags
These tags may be present in multiple event kinds. Whenever a different meaning is not specified by some more specific NIP, they have the following meanings:
- `r`: a web URL the event is referring to in some way
- `i`: an external id the event is referring to in some way - see [NIP-73](73.md)
- `title`: name of [NIP-51](51.md) sets, [NIP-52](52.md) calendar event, [NIP-53](53.md) live event or [NIP-99](99.md) listing

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73.md Normal file
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NIP-73
======
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 [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
---
### 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]`

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README.md
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@ -77,6 +77,7 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
- [NIP-70: Protected Events](70.md)
- [NIP-71: Video Events](71.md)
- [NIP-72: Moderated Communities](72.md)
- [NIP-73: External Content IDs](73.md)
- [NIP-75: Zap Goals](75.md)
- [NIP-78: Application-specific data](78.md)
- [NIP-84: Highlights](84.md)
@ -238,7 +239,7 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
| `-` | -- | -- | [70](70.md) |
| `g` | geohash | -- | [52](52.md) |
| `h` | group id | -- | [29](29.md) |
| `i` | identity | proof | [39](39.md) |
| `i` | external identity | proof, url hint | [39](39.md), [73](73.md) |
| `k` | kind number (string) | -- | [18](18.md), [25](25.md), [72](72.md) |
| `l` | label, label namespace | -- | [32](32.md) |
| `L` | label namespace | -- | [32](32.md) |