{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x43b8034dd8b18a99ee08d4d694cc56a8f4947f97e731d62e6d3045a0bc3f70c4",
    "signature": "0xcd22433542e3fc0fae0e74798286618d15cf8652351567c82ed6af80cafe4714679347e821a278845c7888733a8300f8734fe503bad079e2368c73e7f24ca8231c",
    "signer": "0xe3418cCa91C667130Ea5469A336DaF057b07E7D1",
    "userId": "736544419"
  }
}