{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9f2e201a31c6cb4b23819958a07f446d8eccb9148d4f9d972519da5b9e1218bd",
    "signature": "0x8abccd787b65694200d77126506ba57652d64e50efe5edfb0eca90d1c1765a9a445d84849d1aad47073e64fe29041747aab06960cc9d24525d680fd2437290d11c",
    "signer": "0x1fdb8b8d658C971e3AA77c0438DE87276B080c05",
    "userId": "821421961"
  }
}