{
  "manageEntity": {
    "action": "Save",
    "entityId": "1623693722",
    "entityType": "Track",
    "nonce": "1792327040881196178",
    "signature": "0x975d0c801f85e73ebfa2225d1270053919fd72f269c047b766dc593f102d74e3626780692b1850f3b8d1c0b4bbb2acc0fee7686297f747270cf7852795cfff491c",
    "signer": "0xE9e5656ce6F7Fe41FDbCA982901407eB55765cD3",
    "userId": "670307808"
  }
}