{
  "manageEntity": {
    "action": "Save",
    "entityId": "1305766829",
    "entityType": "Track",
    "nonce": "1792468036531178167",
    "signature": "0x5d9a7bb549676f395f77d98ad3885d20ef7f26a514d0d7f6761b7217f01ed97742c282119298c623a47a34d475dc2019f41ea56e2db42d3a939de313605f73d01c",
    "signer": "0x1007e09532BE90331E035838A9E2E0700bB9741a",
    "userId": "329513359"
  }
}