{
  "manageEntity": {
    "action": "Save",
    "entityId": "1491995775",
    "entityType": "Track",
    "nonce": "0xf6bdca6f179103d498d4edeb0ec024aa4be7264d09188bc1dc43cfef8476fb06",
    "signature": "0xdda45e234708438c19849f6680cb06e7a12a23306088759d751f9fd36c12765f25773069f7dba1f0b3edbe4996dd6c528645f2e243e239478cea81d9577b25f51b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}