{
  "manageEntity": {
    "action": "Save",
    "entityId": "486531379",
    "entityType": "Track",
    "nonce": "0x5cf4b650d87aa85a53de04ca3913a41a390052c4b50bd01f66e86b9846eae91a",
    "signature": "0x895f4190a2229fecda71a73a39427528fb2206c29d7fd87e623c3f46afefa7ba2231b83741581fed66bbf9b1d8811af16b8c3aa7f43884897449a399a1d5e7491b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}