{
  "manageEntity": {
    "action": "Save",
    "entityId": "1566661369",
    "entityType": "Track",
    "nonce": "0xe884c5cb91ed95a000ef2d26cda4a09930ba834ee03a4b85a39f6b2af8a300f4",
    "signature": "0xce9755a3af54d6598d78af5eb1415511b8adf167be75d4ec0a5db92ed0f7b18c0de9ff04d22aa89b9fa7ccdc686f7a89588f2d4008babd82ddc057832227ad5c1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}