{
  "manageEntity": {
    "action": "Save",
    "entityId": "516923441",
    "entityType": "Track",
    "nonce": "0xf9b7350c3fe9f8596c5f468b7806da7e0c1bba1762e7d2b502fde618786f5256",
    "signature": "0x01ddfa1a0f5f68a70bd8c5c7b365d2f84300c58b59c8531151945def155a19522d60b0a9fc211a98e6d62db6db77083b426e9273303d9073e6026f17a6060dc11b",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}