{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xd115bf62baf9f82517b6ebba07b79b93df7f0e88e8683c2ef0e042ce99b145f3",
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    "signer": "0xb84B29d012828737440a5588dCd931a73C09765B",
    "userId": "257837133"
  }
}