{
  "manageEntity": {
    "action": "Save",
    "entityId": "648909",
    "entityType": "Track",
    "nonce": "0x6383b3fa8ffd7fc050b1e9c47814d77d81d645a9903dfbd0f6e364bb96e21a0a",
    "signature": "0x4542e09d3d4c56ac36fd5c605bd77c803f7c226b131c944bd60c3c863f1f686c5db1a9f22cac25f563b517e0f80859068217b38e5101408d09500ebb0f1f2e2e1b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}