紫水晶的个人主页的公钥下面多了一行以nprofile开头的字段，这是啥东东，有谁知道？

原始 JSON

{
  "kind": 1,
  "id": "c6ca77416a5788301cff69fa5e64a8a830e6b48a64d45265624302b74095b64b",
  "pubkey": "81913081246d192c9a55951704270756b222094470b3171e58bb5e3c42ee8db5",
  "created_at": 1775890725,
  "tags": [
    [
      "alt",
      "A short note: 紫水晶的个人主页的公钥下面多了一行以nprofile开头的字段，这是啥东东，有谁知道？"
    ],
    [
      "client",
      "Amethyst"
    ]
  ],
  "content": "紫水晶的个人主页的公钥下面多了一行以nprofile开头的字段，这是啥东东，有谁知道？",
  "sig": "423451beb7bbea89bd42ca3ee0bc764afb7b0aa290b59a4578c830cb3783f3e8d7215bce47a8fa4977e811f61b924d9b0ac0d8e8409ee3fafb0121fef0001e6c"
}