{
  "manageEntity": {
    "action": "Save",
    "entityId": "1124578",
    "entityType": "Track",
    "nonce": "0xb574c7335db2317bd4424c154db686ab99ca4322b00cfbbb5cadeb93e73a94f9",
    "signature": "0xbd20a39ecc6dbbe06dab53306fb4400109460429defabcc29ddd533492d1637764b933dc47c64426584f5de98386b2f9cf036a0f054b964e21afe5ce291e25631b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}