{
  "manageEntity": {
    "action": "Save",
    "entityId": "479766",
    "entityType": "Track",
    "nonce": "0x40dd80aaeff64625b4c6bce082b3cd0ec15e8eed053911d6c29a8b2453723dbb",
    "signature": "0x7158affbd5e2e0c119a06dd51f7807dbd533147cc7c02427d264724d9ae62658133132a207b58c83c2a25cfcf7405cc443e83bfc4bf42f785fa8a7b9145eb9631b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}