{
  "manageEntity": {
    "action": "Save",
    "entityId": "290264184",
    "entityType": "Track",
    "nonce": "0x6ed184eca833146a087d5b933ec9ca26b9ac7c37954ced9d4a96e30bf701b918",
    "signature": "0x8b77a9089744b3ec8387ea5cc17e7eedc5ef84c66cf76fc233cb81fbb32ad22d06f7a50ea3d65f138758fcbeda2899a6fa667ea543758ab96f430862e49cb38a1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}