{
  "manageEntity": {
    "action": "Save",
    "entityId": "604575776",
    "entityType": "Track",
    "nonce": "0xc89e407ab8943780be8b9105ea1aff1e1880f14fc6749f43975d8ba3c8903207",
    "signature": "0x6ccf81b32d4533c42928ca26ca3aec6799a1ae4454a3f9618ccd48693f80718217608a331f623ed5ad15b940e576ec4efc7a701bcc0ebeb7cbde3cb196fca74a1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}