{
  "manageEntity": {
    "action": "Save",
    "entityId": "302409055",
    "entityType": "Track",
    "nonce": "0xd517342e0fea6182a0c2895d1abd1db9643746384f4a9266f97aa3a1c96b75b5",
    "signature": "0xb93d040dd3ea2a70535ef577767ea6027a9da3b194c617d8166fefe6137f4cbb7037909dc41a1fb9419be31b8f66f1f0f96ec142760e5767f383b45b43fc83011c",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}