{
  "manageEntity": {
    "action": "Save",
    "entityId": "409890",
    "entityType": "Track",
    "nonce": "0x7f4f84849d89f9355b0c747f397affed1264bd32a4201fa464bfdd81e2bb92ff",
    "signature": "0xb9219b7221a37e4542491325643e3a60e0681e4a0b199b274475e4a9d2512a7f3cd91807d44603c66c20bc24a30e6a9c9c49d5a4276882e0410a6e5753fec7e11b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}