{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x7fe86174cb8b4f1e375c2a3ffeb879bf7320cd3b538d6e08dae638b5847a7bcb",
    "signature": "0x19a93a462e91d6acb24fc1eeaafee6fbfad76786edd9a3e77a73551f3edeae925561f65076ead9559bf67f49bafff9fab8a4cb7ebdae42ec769c04e499ce987f1b",
    "signer": "0xCEE883d0cC7C90bE040Af1f13E5485579E32cb68",
    "userId": "901122144"
  }
}