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NIP-51

Lists

draft optional author:fiatjaf author:arcbtc author:monlovesmango author:eskema author:gzuuus

A "list" event is defined as having a list of public and/or private tags. Public tags will be listed in the event tags. Private tags will be encrypted in the event content. Encryption for private tags will use NIP-04 - Encrypted Direct Message encryption, using the list author's private and public key for the shared secret. A distinct event kind should be used for each list type created.

If a list should only be defined once per user (like the "mute" list) the list is declared as a replaceable event. These lists may be referred to as "replaceable lists". Otherwise, the list is a parameterized replaceable event and the list name will be used as the d tag. These lists may be referred to as "parameterized replaceable lists".

Replaceable List Event Example

Lets say a user wants to create a 'Mute' list and has keys:

priv: fb505c65d4df950f5d28c9e4d285ee12ffaf315deef1fc24e3c7cd1e7e35f2b1
pub: b1a5c93edcc8d586566fde53a20bdb50049a97b15483cb763854e57016e0fa3d

The user wants to publicly include these users:

["p", "3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d"],
["p", "32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245"]

and privately include these users (below is the JSON that would be encrypted and placed in the event content):

[
    ["p", "9ec7a778167afb1d30c4833de9322da0c08ba71a69e1911d5578d3144bb56437"],
    ["p", "8c0da4862130283ff9e67d889df264177a508974e2feb96de139804ea66d6168"]
]

Then the user would create a 'Mute' list event like below:

{
  "kind": 10000,
  "tags": [
    ["p", "3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d"],
    ["p", "32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245"],
  ],
  "content": "VezuSvWak++ASjFMRqBPWS3mK5pZ0vRLL325iuIL4S+r8n9z+DuMau5vMElz1tGC/UqCDmbzE2kwplafaFo/FnIZMdEj4pdxgptyBV1ifZpH3TEF6OMjEtqbYRRqnxgIXsuOSXaerWgpi0pm+raHQPseoELQI/SZ1cvtFqEUCXdXpa5AYaSd+quEuthAEw7V1jP+5TDRCEC8jiLosBVhCtaPpLcrm8HydMYJ2XB6Ixs=?iv=/rtV49RFm0XyFEwG62Eo9A==",
  ...other fields
}

Parameterized Replaceable List Event Example

Lets say a user wants to create a 'Categorized People' list of nostr people and has keys:

priv: fb505c65d4df950f5d28c9e4d285ee12ffaf315deef1fc24e3c7cd1e7e35f2b1
pub: b1a5c93edcc8d586566fde53a20bdb50049a97b15483cb763854e57016e0fa3d

The user wants to publicly include these users:

["p", "3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d"],
["p", "32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245"]

and privately include these users (below is the JSON that would be encrypted and placed in the event content):

[
    ["p", "9ec7a778167afb1d30c4833de9322da0c08ba71a69e1911d5578d3144bb56437"],
    ["p", "8c0da4862130283ff9e67d889df264177a508974e2feb96de139804ea66d6168"]
]

Then the user would create a 'Categorized People' list event like below:

{
  "kind": 30000,
  "tags": [
    ["d", "nostr"],
    ["p", "3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d"],
    ["p", "32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245"],
  ],
  "content": "VezuSvWak++ASjFMRqBPWS3mK5pZ0vRLL325iuIL4S+r8n9z+DuMau5vMElz1tGC/UqCDmbzE2kwplafaFo/FnIZMdEj4pdxgptyBV1ifZpH3TEF6OMjEtqbYRRqnxgIXsuOSXaerWgpi0pm+raHQPseoELQI/SZ1cvtFqEUCXdXpa5AYaSd+quEuthAEw7V1jP+5TDRCEC8jiLosBVhCtaPpLcrm8HydMYJ2XB6Ixs=?iv=/rtV49RFm0XyFEwG62Eo9A==",
  ...other fields
}

Lets say a user wants to create a 'Categorized Bookmarks' list of bookmarks and has keys:

priv: fb505c65d4df950f5d28c9e4d285ee12ffaf315deef1fc24e3c7cd1e7e35f2b1
pub: b1a5c93edcc8d586566fde53a20bdb50049a97b15483cb763854e57016e0fa3d

The user wants to publicly include these bookmarks:

["e", "5c83da77af1dec6d7289834998ad7aafbd9e2191396d75ec3cc27f5a77226f36", "wss://nostr.example.com"],
["a", "30023:f7234bd4c1394dda46d09f35bd384dd30cc552ad5541990f98844fb06676e9ca:abcd", "wss://nostr.example.com"],
["r", "https://github.com/nostr-protocol/nostr", "Nostr repository"],

and privately include these bookmarks (below is the JSON that would be encrypted and placed in the event content):

[
    ["r", "https://my-private.bookmark", "My private bookmark"],
    ["a", "30001:f7234bd4c1394dda46d09f35bd384dd30cc552ad5541990f98844fb06676e9ca:abcd", "wss://nostr.example.com"],
]

Then the user would create a 'Categorized Bookmarks' list event like below:

{
  "kind": 30001,
  "tags": [
    ["d", "bookmarks"],
    ["e", "5c83da77af1dec6d7289834998ad7aafbd9e2191396d75ec3cc27f5a77226f36", "wss://nostr.example.com"],
    ["a", "30023:f7234bd4c1394dda46d09f35bd384dd30cc552ad5541990f98844fb06676e9ca:abcd", "wss://nostr.example.com"],
    ["r", "https://github.com/nostr-protocol/nostr", "Nostr repository"],
  ],
  "content": "y3AyaLJfnmYr9x9Od9o4aYrmL9+Ynmsim5y2ONrU0urOTq+V81CyAthQ2mUOWE9xwGgrizhY7ILdQwWhy6FK0sA33GHtC0egUJw1zIdknPe7BZjznD570yk/8RXYgGyDKdexME+RMYykrnYFxq1+y/h00kmJg4u+Gpn+ZjmVhNYxl9b+TiBOAXG9UxnK/H0AmUqDpcldn6+j1/AiStwYZhD1UZ3jzDIk2qcCDy7MlGnYhSP+kNmG+2b0T/D1L0Z7?iv=PGJJfPE84gacAh7T0e6duQ==",
  ...other fields
}

List Event Kinds

kind list type
10000 Mute
10001 Pin
30000 Categorized People
30001 Categorized Bookmarks

Mute List

An event with kind 10000 is defined as a replaceable list event for listing content a user wants to mute. Any standardized tag can be included in a Mute List.

Pin List

An event with kind 10001 is defined as a replaceable list event for listing content a user wants to pin. Any standardized tag can be included in a Pin List.

Categorized People List

An event with kind 30000 is defined as a parameterized replaceable list event for categorizing people. The 'd' parameter for this event holds the category name of the list. The tags included in these lists MUST follow the format of kind 3 events as defined in NIP-02 - Contact List and Petnames.

Categorized Bookmarks List

An event of kind 30001 is defined as a parameterized replaceable list event for categorizing bookmarks. The 'd' parameter for this event holds the category name of the list. The bookmark lists may contain metadata tags such as 'title', 'image', 'summary' as defined in NIP-23 - Long-form Content. Any standardized tag can be included in a Categorized Bookmark List.