{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x121b87e3ca18447d52107114a744596b2477faa6b355671d703721e7e5a03178",
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    "signer": "0x48F749768Ec978f5359271bc1Cd91492008084B9",
    "userId": "670646892"
  }
}