{
  "manageEntity": {
    "action": "Save",
    "entityId": "651549067",
    "entityType": "Track",
    "nonce": "0x1a5f23e4867c15c72ab07b19c5ad8e7aef001417440f460c0069a124be28bcab",
    "signature": "0xfd95976e649b070b4b41eb78b3010412c29731e268f84a6fe9a7e176526669b12257852cb1709225f3c0f3b46650f0be8b3493b0fa839da7444373b7e33309341c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}