{
  "manageEntity": {
    "action": "Save",
    "entityId": "301998574",
    "entityType": "Track",
    "nonce": "0x66e0f4f625bfa3c0637d07f6ee8cdffb88f3074a53ab8fbe11d9b3b886d4f636",
    "signature": "0x7b1115e72f8c10fc4e0e97ae6437d70a5fad89fa664efa24f93b55c86eee916c619b3f000cf2631dd5b5ae541ecc075e853a7bdcd6f4491c3953261121f63fb61b",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}