{
  "manageEntity": {
    "action": "Save",
    "entityId": "1303156731",
    "entityType": "Track",
    "nonce": "0x3281270a1a2ec389d5d02587cc7ff6cbc5189b9cf50cb9a498b4a8eea5107c34",
    "signature": "0x3fb258b22cb7e3fa83bc6ee43aba665f45ef5820cd0d8195ea8adcb63cd1fe5130f8218924fc285474bd4da3daad2a192351bc9ed3ddad81cd29619aee533f4a1b",
    "signer": "0x5abad058d33E1C0C0A69d85BA3181678C1721765",
    "userId": "632918751"
  }
}