{
  "manageEntity": {
    "action": "Save",
    "entityId": "685197966",
    "entityType": "Track",
    "nonce": "0xa777dbf29d44e6e393184a1754dd2ef63f55732e69446205dd55ac5f41c450d8",
    "signature": "0xc9aeebebbd942379337c4de676625af1535fac3d824a8918ce81903da06d573375636aafa6de02c4e101bd7bce2635a446e48dbd3521d4ccf9344996eddb010a1b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}