{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8def7162c3cca59ad69ea738c8d5517be33ff0031ab70e4d85a76a7188aef30a",
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    "signer": "0x66A81E2901930977358786d0457bDe690A05d34e",
    "userId": "442407525"
  }
}