{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb02610b674f665b341f61381a6100226325c8230445b90ba09c70fb4b625a8bf",
    "signature": "0xd51bc7d6ca08de92648ab7445f5522a68c0f0a1fcfb88c661a44d2597bf045ab4358774eac67e926b612eefa38e91769f4b194ae5c248ea3fd9677b2660df3611b",
    "signer": "0x1788E4C39d3326e598F16767C69826869594E359",
    "userId": "116504833"
  }
}