{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xaaebac790f76603130dda350f5592a6d0b4d32102f8b59fc16e15d8451d745c5",
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    "signer": "0xEAf7d5841a3D23F208b8ae2d671c89117a4b3cfB",
    "userId": "125943454"
  }
}