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Nostr Implementation Possibilities

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NIPs

NIPs stand for Nostr Implementation Possibilities. They exist to document what may be implemented by Nostr-compatible relay and client software.

Event Kinds

kind description NIP
0 Metadata 1, 5
1 Short Text Note 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
1984 Reporting 56
9734 Zap Request 57
9735 Zap 57
10002 Relay List Metadata 65
22242 Client Authentication 42
30023 Long-form Content 23
1000-9999 Regular Events 16
10000-19999 Replaceable Events 16
20000-29999 Ephemeral Events 16
30000-39999 Parameterized Replaceable Events 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
a coordinates to an event relay URL 33, 23
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

  1. They should be implemented in at least two clients and one relay -- when applicable.
  2. They should make sense.
  3. 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.
  4. There should be no more than one way of doing the same thing.
  5. Other rules will be made up when necessary.

License

All NIPs are public domain.

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