{
  "manageEntity": {
    "action": "Save",
    "entityId": "506482200",
    "entityType": "Track",
    "nonce": "0x79d6bfdac0127f869906d400528453717add02ed753bf0813b289a073d9a072c",
    "signature": "0x14c9dc53f795370e72139479d7386485f30537a47b95b9da8272ce79c231d734251741347dd7579a19716e8f1355342db6c4e05a0d038161cfd8a8ba0c2490031c",
    "signer": "0x3a445fb4E2f4bA0d31274a8865b77A74bd192F2F",
    "userId": "147726"
  }
}