{
  "manageEntity": {
    "action": "Save",
    "entityId": "388423313",
    "entityType": "Track",
    "nonce": "0x1638a14ab39f7ccea5001d98f7de4175d726ab26b61d27e51b5af11c6e9ded86",
    "signature": "0xd5e7259c22e459e8ef502163a67bd1c14bcfb66d9da2e7b81240683fa4e56cea172eb3da0c14ef94a2a517893232698f1667cf5fd2f004719c58bf2425cd5d7d1c",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}