{
  "manageEntity": {
    "action": "Save",
    "entityId": "516184098",
    "entityType": "Track",
    "nonce": "0xdc50b911a42ae6a049fd7ee435bbd0766f7cf50498c077ababbd600ce6f81f3a",
    "signature": "0xf6c522d648d6c627d6050eb2598c2abfbebf2c3745c5c474a668574cf4e67ce5024f64d2ecf0e9b70850e27245cb941c2c9ae5783bd83852958038207c2e9aab1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}