{
  "manageEntity": {
    "action": "Save",
    "entityId": "333943",
    "entityType": "Track",
    "nonce": "0xcf7599750371230e01c58d2012baac0a517d25dd8018d2f5fb8e33b693d1edd1",
    "signature": "0xf6ac1e2a9975a2f552f631dc9b77f40ef41d6276524b2a175903a915e6bc30b26b047e4658c1a725adb38bc90cd04abddd59f26e540f69865a4b599846c44e9d1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}