{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa3933c9f5f28f5029b34b7e6b934febe0b3e853efd5bf6899d45d96ee30b0114",
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    "signer": "0x645517c3248638BaA7a00C7e619F7376Cab16562",
    "userId": "937273443"
  }
}