{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x938de606d2071e48f0dab92f6831e23a45ca08915c1802e2023dff553bdb9c50",
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    "signer": "0xeB19B44f7479B2f07c2a9D2CE20E42244add392A",
    "userId": "460208108"
  }
}