{
  "manageEntity": {
    "action": "Save",
    "entityId": "673605060",
    "entityType": "Track",
    "nonce": "0x4b39ad1bcd9dd81a694e5b894d9a4f16abc0c385bfb17210fa449ec3f4729b2f",
    "signature": "0xcef1a489e11a6585a8ed9f6c26345bcb6c463ecc4cee19b53eee69bc656b9ce2634fe15a34b40d9f0fcab71073c1ac8d166ce201b5e9ef6c3a2af8003ed340361c",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}