{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x21049f48aa03d2244c20e1985fd8c2645d09505c9f48872e6b46344b2b48fabf",
    "signature": "0x8e280ae8fb010ebafb160a1eca1a9c48d46b0ab6374f771eca6ecc7f465d515a647cc7c0fc2fc774e3135adf8c8b7f79bf216c8aa3ce39aa6ede3045cdadb74b1b",
    "signer": "0xcaAc28aeAb1d6A402463f9F4e096De71F8e8c319",
    "userId": "514794984"
  }
}