{
  "manageEntity": {
    "action": "Save",
    "entityId": "193085049",
    "entityType": "Track",
    "nonce": "1789993935921391743",
    "signature": "0xf8d9e94c195320a16cce1f0712ee25abf62910f6509623bb231173461adb9d041cb6f60bd896ab5084aeeac356fb6d08bb9072b9556dbf03f5079771e2e783541b",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}