{
  "manageEntity": {
    "action": "Save",
    "entityId": "743610185",
    "entityType": "Track",
    "nonce": "0xb21c1abec9de5377123c8f18f3af1b4923f0e3f07feabf2345f9bf00ae7b095b",
    "signature": "0xb26ad178f1cb533378a1f9e5a74b2229effdbcc12eb4d357912f22e85eedc1697dc223cda0bc1634278f0303672ca022cd7131e0489e71ef347f42add4e5296c1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}