{
  "manageEntity": {
    "action": "Save",
    "entityId": "838349006",
    "entityType": "Track",
    "nonce": "0x5e18e6b4b63db1712c2b3dd7a8b876fc1b09343d8635321d0f43a75729036187",
    "signature": "0x3d2a7a3c37b81f4d38f736bb3c0822178f764c342fb9d47609a283c5757a0596381b5ca9c8ef0224d8c9768449e1a6a57cc5d36158a9a902058b0940db002bd61b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}