{
  "manageEntity": {
    "action": "Save",
    "entityId": "210154",
    "entityType": "Track",
    "nonce": "0x3401b019fac8c6267b3baf0075bf8e640e5beefdbb1e6c71159e4418fb9c4794",
    "signature": "0xa0f8cf50cb8e540c32a2a074e0d0c4e03c2a70bbe7ff6c42277359e5a67b79776b4a2f49d0c41c6da456485b8c74f4272b592b06b78b224ef44414f33705d84c1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}