{
  "manageEntity": {
    "action": "Save",
    "entityId": "30703260",
    "entityType": "Track",
    "nonce": "0xb315db042eb106c1a30922f819724e66018e4c9b7a2ada854e68655226349cb2",
    "signature": "0x6b21e6e7bd8986678eda6b523c3375c91cc198148d5f927fcec825231f165e4262b80ce08127694f34d29392af9242ac92eb71bd270abda8cfc210541f9758d01c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}