{
  "manageEntity": {
    "action": "Save",
    "entityId": "604314",
    "entityType": "Track",
    "nonce": "0x74656b0d16cd566c8fe2a8772a5afc230d5484894281deaac1d31c6eeb47a721",
    "signature": "0xe09f482c580c2c6ab734c47a635322b9a3af96fd0e2da643b6f1ec2fa4dc0d981554e92c651c04b4e193aca47f058564e6ac36f783809cec32a6bec6fd5f21f11b",
    "signer": "0x2d1433997Bc600d9CAEb07397d001FF5797b4070",
    "userId": "797418792"
  }
}