{
  "manageEntity": {
    "action": "Save",
    "entityId": "153558",
    "entityType": "Track",
    "nonce": "0x4997f30e0dad20be5c352c012d0612dd293b52bb2776d5ac5ba62cf2de967631",
    "signature": "0x71368a1ca35382743a9be55349fb45d575e05379e483596fe1826d528d50507f764b23018b844762878319bb16a84f35cd58ccbd68fe03dfac6f1f00d5a035351c",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}