{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x53d391935ba58c3a817f4f702d3d382a3bc02f088126c08151200b14ff5a0be2",
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    "signer": "0xFCDfb74E763fE5b9120473Da4F79516edeb5d750",
    "userId": "736573111"
  }
}