{
  "manageEntity": {
    "action": "Save",
    "entityId": "1103464",
    "entityType": "Track",
    "nonce": "0x71d696e891a469da89e4a8fcfb3ebd4740ec8999e5b44e65ad9bcde7dbfb3fa6",
    "signature": "0xf412bb903b83d4b89a9354a2da13c35bae9756cb15ee7afcb9d1ce33f4bb440a2996fecd08c2327d898d50dd9f7c49b533ec4f8c93a6a6207f6f290aa2c095d01c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}