{
  "manageEntity": {
    "action": "Save",
    "entityId": "1616243496",
    "entityType": "Track",
    "nonce": "0xca64d1bffee8135198df364709ff6e347a8da80c25c044972c5937e2c660f3ca",
    "signature": "0x14ea332abe491c1b4b87d2ff07c6fd6bb8b405adef89bd29568f4af96bc909fc5b4aa0e6c282121865714c37681f9e7ca0b2acf007bf9d563319e2fd867f48aa1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}