{
  "manageEntity": {
    "action": "Save",
    "entityId": "433787489",
    "entityType": "Track",
    "nonce": "0x37db031020f89cff9b4969492ee6ecdb8d5eb67d6c2602f75c272aa7cf5abf9b",
    "signature": "0x01d51fe7af71f14df263e21cdbbc1455f70d014d51ac0c5784a822618304d814271c160488a01397b64548151dbf357c1e57ae8d2fd46999f76becadfd9220ce1c",
    "signer": "0x040629E31a68119093b9a0111257C8449c2f8e10",
    "userId": "20"
  }
}