{
  "manageEntity": {
    "action": "Save",
    "entityId": "550659",
    "entityType": "Track",
    "nonce": "0x69d0a41163529cb55f3d9316657cd76ffecc4c571740f2fee7ad4d17824bb87b",
    "signature": "0x43ab99993a9e9b6a3de7df609f779cd14cddc07b7d00fe75f859a5d075f1d5ee53ffb17c77923ba952ef96fb228f8d322439845812857b99483fa73ad6fda1a71c",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}