{
  "manageEntity": {
    "action": "Save",
    "entityId": "718469582",
    "entityType": "Track",
    "nonce": "0xe092b6bafcaea8a57a19e07c10938217c60a2a80907edc60114de4c7719fa104",
    "signature": "0x4ba7eb16173df81ef6f754160014a7b15c57700bdf85981f86fd9d219a5d78450383acd66d29ff37c6e2853a64a93d89613843c4c548aca1c322ee76e071b06f1c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}