{
  "manageEntity": {
    "action": "Save",
    "entityId": "474376",
    "entityType": "Track",
    "nonce": "0xe551cdbba6e41288711fc5c556d092ca53d65370fe8c333b6fc15f1e0d8f8f29",
    "signature": "0x53cbdce141e14cdc15d5c487d00f1f0e9a7a5ece39206a352053f308ae8db28b527d837664f31b53b53872c71efb9482f60a6c16fb725d41f3a5517a2f68e56e1c",
    "signer": "0x7D273271690538cF855E5b3002A0dD8c154bB060",
    "userId": "1"
  }
}