{
  "manageEntity": {
    "action": "Save",
    "entityId": "815711660",
    "entityType": "Track",
    "nonce": "0x0cc576baf0703218f2964c4d095ce7f09ab4a1e1f02e5f8e49566983757e319a",
    "signature": "0xa5978218aa2bde8408fd29ddc89598f885156546765f2d45b7a1b4b286bbb19f2049fa4a572bb0e20896bc5079765e7031347e44f78ff9fbdc740eed942554191b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}