{
  "manageEntity": {
    "action": "Save",
    "entityId": "644626943",
    "entityType": "Track",
    "nonce": "0xc8f7dc498989f4f314ef173111e637b5630951cfc3e19e064f1009bdcb245479",
    "signature": "0x2b6fe6aaea6018631fe0e46e78e12d9b0ed89da42bf6be36d98b6cba5684dc8a5e5562a1bc511af5f2b95a9be30f88a4aa0cdd9a2155ef08c60369b010a0facf1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}