{
  "manageEntity": {
    "action": "Save",
    "entityId": "393588717",
    "entityType": "Track",
    "nonce": "0xcffa74c1448d3221ef34913b4d4f1918cfd36bc611317b19ddd4cb460b03197f",
    "signature": "0xad29aee18f748e58fa9ce11e165f373062334983911a08de211200daff1a1f6a02420b1d0905fc5d3ac2e713f2a3ea72ca78710e5108b8c4cacd5020066cac011b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}