{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x54daa1ff3faadbd31bec1db9173fb61d1a6f49f552b53365266e75cce92a8fa3",
    "signature": "0x3bcaa0729349b3705c8b5c3917f11d8df306057871e859dde07bd6fa9df3becc4176f28ce4e84cd4b6c146095de5fd2f6a85cf70aa690c5fab3cd789aff3844b1c",
    "signer": "0x57E6e1DC73e16a7d9D0A077241Cf1cA038DE50cF",
    "userId": "309882939"
  }
}