{
  "manageEntity": {
    "action": "Save",
    "entityId": "712291",
    "entityType": "Track",
    "nonce": "0x38a887dfa5a081f67662a7cf573f98b3d10699873121092ffbbf1109ec1b998a",
    "signature": "0xc678710846a06ab4885bbc59a335f41946b7ff8d4cc5d06c3ae13373366e71702e52df3f9ce40f60c9ac9b9e4340dd82dd4c8f70e85766fe6a4e74e4382d3eeb1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}