{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x74f7158b67f6804d0a9f172c1592f448e4c69fb25426e1651c50499ddbb92471",
    "signature": "0x1d6758c4370de4fe9728f64383518e841408944e6a1bb95305667f865d1084675ba818f6f929790e09a1e627aa6c144f4fb673e93330b0907b39e05031af4b221b",
    "signer": "0xadFbCF82cbBa7806b6c49951763d28204A532876",
    "userId": "33410380"
  }
}