{
  "manageEntity": {
    "action": "Save",
    "entityId": "521920",
    "entityType": "Track",
    "nonce": "0x7fd9f03f9480b4731d7c63407a38bea42c06b3f964e620bc2f921d721fceb471",
    "signature": "0x0503293bd1ee207ac07a9fbb1c81c97b4be4bc74021ed996326401d19b06c16651dfa9c84abf4febc09032afbfdc94fd5c6132594e1adc84ed262da4d8cd03291c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}