{
  "manageEntity": {
    "action": "Save",
    "entityId": "192612678",
    "entityType": "Track",
    "nonce": "0x928c70fd682e397a5df6a67ece99ea4d662e6182f7197a0711d121a1b1d819eb",
    "signature": "0x571278db325463a0946a55742931ff5a19781b3a741b5c3de0fc1df9ee8955a912379eacc9cabcda299f703dc04ff9f817852855eac378237c336fbc69f8ecaa1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}