{
  "manageEntity": {
    "action": "Save",
    "entityId": "883716458",
    "entityType": "Track",
    "nonce": "0x243d5643fec017c23a8c7f6e3158bd022e1b8d5d8eb5cc6e55e41de68c09f3f4",
    "signature": "0x354360cc593411332e12bc887967b9d79452844bf0e5e3fb36713b3458e60ffd1c69c4d595543bc80ddaf5f45fc29720d3b2ec16bdaad08246a87bd81b95266e1b",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}