{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x142c45b96044f9d98fdb23176c4b100219657efd9d97e5a28920b55ee2419b9b",
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    "signer": "0xd3cFd8491F92ff012f5bcB989eDf511Ab9A99891",
    "userId": "311259731"
  }
}