{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x904d4fc0646d111e1ea253a2de21c646e6ac62e731aa9a8a71d9d270312ede97",
    "signature": "0xd99da3c5e9c7cc4ef4983fd58ca84629e333fb45547d6389767bcd5d4e6f96124aa16360842d78e5336ad1174d571f599ac644523483c3bff372a126aa4105b21b",
    "signer": "0x3F1f3d8789DB971BfE67B17a0383797847Fa856C",
    "userId": "486741295"
  }
}