{
  "manageEntity": {
    "action": "Save",
    "entityId": "590382921",
    "entityType": "Track",
    "nonce": "0xa808ddb24d68c9c7c6ae5ca0b5cb82a54c80fdec8c29fda627a44f75665ff725",
    "signature": "0xa3f1751d63c556d2b6cb72cab4664d6a893b057ad4e7fb6ce504266e71c9570012b615a5ee000e08a8fd2e787c05fd1f82616a673a48f765df1ec60260bff4db1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}