{
  "manageEntity": {
    "action": "Save",
    "entityId": "344829551",
    "entityType": "Track",
    "nonce": "0x78a007da06aa8a6ee8ef8d7ec67f81fd3241af74452bc8ab4863f1d6e76381b4",
    "signature": "0x57afa9039c468de2e83f559455484a27b75a4aa7d531d1ec2265de6108a218324fe5f8094c7db3823955901ede97c580053466b1b92a6cc690401a026b9d0ecf1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}