{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x419230007ffed8f137f9440f62d774ceebbbdf3b67c3f37646daeba74b0e608d",
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    "signer": "0xF7F32441263345Cb41C1BfFa72F73f7302a51D80",
    "userId": "753807502"
  }
}