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Nostr Implementation Possibilities
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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-compatible relay and client software.
- NIP-01: Basic protocol flow description
- NIP-02: Contact List and Petnames
- NIP-03: OpenTimestamps Attestations for Events
- NIP-04: Encrypted Direct Message
- NIP-05: Mapping Nostr keys to DNS-based internet identifiers
- NIP-06: Basic key derivation from mnemonic seed phrase
- NIP-07:
window.nostrcapability for web browsers - NIP-08: Handling Mentions
- NIP-09: Event Deletion
- NIP-10: Conventions for clients' use of
eandptags in text events. - NIP-11: Relay Information Document
- NIP-12: Generic Tag Queries
- NIP-13: Proof of Work
- NIP-14: Subject tag in text events.
- NIP-15: End of Stored Events Notice
- NIP-16: Event Treatment
- NIP-19: bech32-encoded entities
- NIP-20: Command Results
- NIP-21:
nostr:URL scheme - NIP-22: Event created_at Limits
- NIP-25: Reactions
- NIP-26: Delegated Event Signing
- NIP-28: Public Chat
- NIP-33: Parameterized Replaceable Events
- NIP-36: Sensitive Content
- NIP-40: Expiration Timestamp
- NIP-42: Authentication of clients to relays
- NIP-50: Keywords filter
Event Kinds
| kind | description | NIP |
|---|---|---|
| 0 | Metadata | 1, 5 |
| 1 | Text | 1 |
| 2 | Recommend Relay | 1 |
| 3 | Contacts | 2 |
| 4 | Encrypted Direct Messages | 4 |
| 5 | Event Deletion | 9 |
| 7 | Reaction | 25 |
| 40 | Channel Creation | 28 |
| 41 | Channel Metadata | 28 |
| 42 | Channel Message | 28 |
| 43 | Channel Hide Message | 28 |
| 44 | Channel Mute User | 28 |
| 45-49 | Public Chat Reserved | 28 |
| 10002 | Feed Advertisement | 65 |
| 22242 | Client Authentication | 42 |
| 10000-19999 | Replaceable Events Reserved | 16 |
| 20000-29999 | Ephemeral Events Reserved | 16 |
| 30000-39999 | Param. Repl. Events Reserved | 33 |
Message types
Client to Relay
| type | description | NIP |
|---|---|---|
| EVENT | used to publish events | 1 |
| REQ | used to request events and subscribe to new updates | 1 |
| CLOSE | used to stop previous subscriptions | 1 |
| AUTH | used to send authentication events | 42 |
Relay to Client
| type | description | NIP |
|---|---|---|
| EVENT | used to send events requested to clients | 1 |
| NOTICE | used to send human-readable messages to clients | 1 |
| EOSE | used to notify clients all stored events have been sent | 15 |
| OK | used to notify clients if an EVENT was successuful | 20 |
| AUTH | used to send authentication challenges | 42 |
Please update these lists when proposing NIPs introducing new event kinds.
When experimenting with kinds, keep in mind the classification introduced by NIP-16.
Standardized Tags
| name | value | other parameters | NIP |
|---|---|---|---|
| e | event id (hex) | relay URL, marker | 1, 10 |
| p | pubkey (hex) | relay URL | 1 |
| r | a reference (URL, etc) | 12 | |
| t | hashtag | 12 | |
| g | geohash | 12 | |
| nonce | random | 13 | |
| subject | subject | 14 | |
| d | identifier | 33 | |
| expiration | unix timestamp (string) | 40 |
Criteria for acceptance of NIPs
- They should be implemented in at least two clients and one relay -- when applicable.
- They should make sense.
- They should be optional and backwards-compatible: care must be taken such that clients and relays that choose to not implement them do not stop working when interacting with the ones that choose to.
- There should be no more than one way of doing the same thing.
- Other rules will be made up when necessary.
License
All NIPs are public domain.