{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x12f0907651b1aa2532878b4f2e7b1e5851cab5d2fad68b46ada23170bb921208",
    "signature": "0xb10fb7fa39a8465ef4fa3eea4afddae536a0f6ae219d66655d70c244a56823c47af9b83071f96c6fe271ba99aceb9d91fd4fa6f529c464dae1dbb342986b0eac1b",
    "signer": "0x016E626013d6c6929737c31A4fE0161bBc6E3cf8",
    "userId": "103104100"
  }
}