{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9cbd2b8f9e7136d9e2f139149d971c1081de2943202e62826bfb186281ad8751",
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    "signer": "0x925FD98278b43515bb81b9840D50f4D349CC6266",
    "userId": "102152128"
  }
}