{
  "manageEntity": {
    "action": "Save",
    "entityId": "579366897",
    "entityType": "Track",
    "nonce": "0x9ce03e4f5240fffc4f47d5afd67d4b5083a5e3be9d2a4d13fc5ad59fc093c999",
    "signature": "0xcb68e6636c7d41e041c64046c8bba08fdef685e526f07a948db88008fdac9a7431177127f62037672583eeaddd6e11b9576ec82ff26b229eaa792b58577247a01c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}