{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xd965b4b30999304ad897f71205839c241fc217c1a2bce17a6fce0ec87aa560e0",
    "signature": "0x784bc61160995af159493a40528144aba04f1830f69302af9abafd99766019425c8c116e08201895ecaf0204532f2defc5509e586ab35dd1be9f63e8d01eef0b1c",
    "signer": "0x5038fc0cAFD4eb8310afc265D6fD7e9194165be4",
    "userId": "636912375"
  }
}