{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb45b239919b7d169a657c36ef9c27da5be9eb2a2e62a7137bbdaa27049f955e7",
    "signature": "0xcf6eba206296bf065601492fb3e673dfd1d30ea49381679503057f4d53dce2977a365cec66fd224da0813442d9d2ea2fb7cbdbde41e28e65428c16c47f1256fe1b",
    "signer": "0x436C8eC89f4B4aBE1B09b0688d363d99714AD7b7",
    "userId": "504283937"
  }
}