{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x66b77d82ab48554e1853d5e69e39a7792df4158cf3ffc2558523e56b69c989d0",
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    "signer": "0x4bEB7D64408E377BC0cE5706956846D437acF8BA",
    "userId": "147968817"
  }
}