{
  "manageEntity": {
    "action": "Save",
    "entityId": "990464541",
    "entityType": "Track",
    "nonce": "0x0c6205ff6c2805bddceec2db111c7961fa85b744b9496f000d6b65a5dee1c436",
    "signature": "0x8ad4efa33aeb6b6c49cbacd1e021533d4953d4b9c48a9eab3552ab30ebffdca44d602b87316af3394de6c1207820374167ab3de5eaf4aed8ce5754c611fd26661b",
    "signer": "0x48c57b64a5a12Dc7C7742Fdb629EEce52FF5591D",
    "userId": "930634116"
  }
}