{
  "manageEntity": {
    "action": "Save",
    "entityId": "1749058618",
    "entityType": "Track",
    "nonce": "0x663c2efab586db71cb4a8c5aced6c1883c09fea23ae300bcfa30983062bc6ede",
    "signature": "0x0fd70f080d683aa97632805d2f389fc276a385221e90cc6b77952304865579db443f24ace4d068ee6bba83a4322eb0cc16dd53b41ead0cb07f6c0cc31e8106b61c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}