{
  "manageEntity": {
    "action": "Save",
    "entityId": "324660302",
    "entityType": "Track",
    "nonce": "0x901f44e303b9fd20acd84f817b417e3182ad8965458ba0b965f9133e08056602",
    "signature": "0xc5522b5811c8265ac5357928dc6931267ac20020aa9dbe37db582c626337653101d99db205065aa9dab0e870689963bdf1543c748ab666c20ecf7781ff04b4a61b",
    "signer": "0xd12A323399559A3773F865c8F21031bc39c29135",
    "userId": "219968466"
  }
}