{
  "manageEntity": {
    "action": "Save",
    "entityId": "1843396014",
    "entityType": "Track",
    "nonce": "0x3b67466805dff8e87bebea25fa9824592dfdab65bdbacde30ff438f6b6136399",
    "signature": "0x48e59e82877f9a4e0de4d94be11e1addc3df5713330867c2cf734fba0e005be10cca2317aa3b6f4e83f73c022b0ef21abf90a0f18ae8b7940a3345649f80dca71c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}