{
  "manageEntity": {
    "action": "Save",
    "entityId": "757077391",
    "entityType": "Track",
    "nonce": "0xbba2c2a1b3d8b264d89796150fa1094b5797aa147dd775f855144b4c2c9619a6",
    "signature": "0x410e47e76bb1f5c56ee2d37daed3bf8cad4419c14ba3b2b8c97f241e141d83115815565f3e44a5efb401354b3bcaadd4d2a233709f14aa5ea0bbfae3d8b25bd21b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}