nips/81.md

NIP-81

Relationship Status

draft optional

This NIP defines two new event kinds (30382 and 30383) to document the relationship between two keys.

Both kinds offer public and private tags to describe that relationship. Private tags are JSON Stringified, NIP-44-encrypted to the signer's keys and placed inside the .content of the event.

Public Relationship Status

Event kind 30382 is used when the relationship itself is public, with the d tag receiving the public key each target key.

{
  "kind": 30382,
  "tags": [
    ["d", "e88a691e98d9987c964521dff60025f60700378a4879180dcbbb4a5027850411"],
    ["n", "follow"],
    ["n", "bitcoiner"],
    ["n", "6064460175057025"]
  ],
  "content": nip44Encrypt(JSON.stringify([
    ["petname", "NVK (Coldcard)"],
    ["summary", "Owes me a beer"]
  ])),
  // ...other fields
}

petname SHOULD be used instead of the person's display name in all interfaces.

Relationship Categories

Optional n tags ["n", "<list code>"] add the target key to unbound lists. This allows clients to query by n and download all members of a list.

List codes can be human readable or not. A new event kind named "Unbound List Names" (kind:10008) uses map tags to display the list name. Clients SHOULD display the name instead of the code if the code is present in this list.

{
  "kind": 10008,
  "content": nip44Encrypt(JSON.stringify([
    ["map", "<code>", "<name>"],
    ["map", "bitcoiner", "bitcoiner"], 
    ["map", "6064460175057025", "debtor"]
  ])),
  // ...other fields
}

Private Relationship Status

For relationships that MUST remain private, Event kind 30383 uses a similar structure but with a hashed d tag using NIP-44's hkdf function.

{
  "kind": 30383,
  "tags": [
    ["d", sha256(hkdf(private_key, salt: 'nip81') || "<pubkey>")],
    ["n", "6064460175057025"],
  ],
  "content": nip44Encrypt(JSON.stringify([
    ["p", "<pubkey>", "relay"],
    ["n", "clients-list"],
    ["petname", "<My buddy>"],
    ["summary", "<Summary of the relationship>"],
  ])),
  // ...other fields
}