{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9664098711a8c2833ecda75a7ee00f27266d05779a74f9a08777e5fe8d04d0dc",
    "signature": "0x009532fe9d1d18fa4827619f7091cd2501aa6c13bc5a81825ce12f546dfb49743b9807f738c4cd7c312b51545443d29663eff61c716fa262c0cf7aa21fc0c3d01b",
    "signer": "0x770fCcEc013f46cC8986C652B0670e7e0d73D20C",
    "userId": "97845937"
  }
}