{
  "manageEntity": {
    "action": "Save",
    "entityId": "447234137",
    "entityType": "Track",
    "nonce": "0xc1a0819b738abdb2a0bd61262a7f0254b635b76136f7eb16b4ba666ecb990eac",
    "signature": "0x3d25865cc1fbeeab72740ad8a62c921560f7f9904e7dba730ba96048caab4a98766fcaf8b39edcc1b7c50533f698264be160089f94b28e49c0e99b13b4a623231c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}