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# NIPs
NIPs stand for **Nostr Implementation Possibilities**. They exist to document what MUST, what SHOULD and what MAY be implemented by [Nostr](https://github.com/fiatjaf/nostr)-compatible _relay_ and _client_ software.
- [NIP-01: Basic protocol flow description](01.md)
- [NIP-02: Contact List and Petnames](02.md)
- [NIP-03: OpenTimestamps Attestations for Events](03.md)
- [NIP-04: Encrypted Direct Message](04.md)
- [NIP-05: Mapping Nostr keys to DNS-based internet identifiers](05.md)
- [NIP-06: Basic key derivation from mnemonic seed phrase](06.md)
- [NIP-07: `window.nostr` capability for web browsers](07.md)
- [NIP-08: Handling Mentions](08.md)
- [NIP-09: Event Deletion](09.md)
- [NIP-10: Conventions for clients' use of `e` and `p` tags in text events.](10.md)
- [NIP-11: Relay Information Document](11.md)
- [NIP-12: Generic Tag Queries](12.md)
- [NIP-13: Proof of Work](13.md)
- [NIP-14: Subject tag in text events.](14.md)
- [NIP-15: End of Stored Events Notice](15.md)
- [NIP-16: Event Treatment](16.md)
- [NIP-20: Command Results](20.md)
- [NIP-22: Event created_at Limits](22.md)
- [NIP-25: Reactions](25.md)
- [NIP-28: Public Chat](28.md)
- [NIP-35: User Discovery](35.md)
## Event Kinds
| kind | description | NIP |
|-------------|-----------------------------|------------------------|
| 0 | Metadata | [1](01.md), [5](05.md) |
| 1 | Text | [1](01.md) |
| 2 | Recommend Relay | [1](01.md) |
| 3 | Contacts | [2](02.md) |
| 4 | Encrypted Direct Messages | [4](04.md) |
| 5 | Event Deletion | [9](09.md) |
| 7 | Reaction | [25](25.md) |
| 40 | Channel Creation | [28](28.md) |
| 41 | Channel Metadata | [28](28.md) |
| 42 | Channel Message | [28](28.md) |
| 43 | Channel Hide Message | [28](28.md) |
| 44 | Channel Mute User | [28](28.md) |
| 45-49 | Public Chat Reserved | [28](28.md) |
| 10000-19999 | Replaceable Events Reserved | [16](16.md) |
| 20000-29999 | Ephemeral Events Reserved | [16](16.md) |
## Message types
### Client to Relay
| type | description | NIP |
|-------|-----------------------------------------------------|------------|
| EVENT | used to publish events | [1](01.md) |
| REQ | used to request events and subscribe to new updates | [1](01.md) |
| CLOSE | used to stop previous subscriptions | [1](01.md) |
### Relay to Client
| type | description | NIP |
|--------|---------------------------------------------------------|-------------|
| EVENT | used to send events requested to clients | [1](01.md) |
| NOTICE | used to send human-readable messages to clients | [1](01.md) |
| EOSE | used to notify clients all stored events have been sent | [15](15.md) |
| OK | used to notify clients if an EVENT was successuful | [20](20.md) |
Please update these lists when proposing NIPs introducing new event kinds.
When experimenting with kinds, keep in mind the classification introduced by [NIP-16](16.md).
## Criteria for acceptance of NIPs
1. They should be implemented somewhere at least as a prototype somewhere.
2. They should make sense.
3. Other rules will be made up when necessary.
## License
All NIPs are public domain.
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