{
  "manageEntity": {
    "action": "Save",
    "entityId": "407367",
    "entityType": "Track",
    "nonce": "0x9a787ee6e409e851aee0831a0f13c5dc3b1c6868bac61c15a149758234e1c211",
    "signature": "0xbc4db08294a65e9b04feb231294260e12e664a126f6f2487beba8545647722875f7706f59e7ac5bb5b57ce80d40ed8d5e9620c56e34a5cff9ea901019cb3d9181c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}