{
  "manageEntity": {
    "action": "Save",
    "entityId": "12090",
    "entityType": "Track",
    "nonce": "0x75cef1d78d7d03e96814c28c25429d2219f56ecd34b5af401c6ad9ba37054251",
    "signature": "0xd755e1b96c46acad99e85fd62445567b8c47d8b56386a8874de2375f04785b331d77108daa6619a50b37572983b261960191e7d9092f5c8c77b05e7aaf8d07ec1b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}