{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8f04ac310c03d8cf3a8e02a06526049a32bde6c54c5d05e6f3c38aaa313051fe",
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    "signer": "0xf30CF3448b693D98101Be93bdFA1A863ad8023fB",
    "userId": "435421579"
  }
}