{
  "manageEntity": {
    "action": "Save",
    "entityId": "1338529969",
    "entityType": "Track",
    "nonce": "1792397192291544133",
    "signature": "0x83c28cca7d5d8dee93fcd58cafb9086e3c54075fd27dec7be3c30ba6717769c1084b13dda92cd90d23b1b64b05fd19a119d0685ce89f095ded413c51a6a953ad1c",
    "signer": "0xE9e5656ce6F7Fe41FDbCA982901407eB55765cD3",
    "userId": "670307808"
  }
}