Why Deriv? It is the only thing that can confirm which account is yours — Deriv gives us no client list to look you up in. We never see your password, and we never place a trade.
Deriv's permission screen will say this app is asking for trading access. That is the only sign-in permission Deriv now offers — DerivZone never places, changes or closes a trade. It reads which account is yours, and nothing else.
On Deriv's screen the app is called DZone Charts — that is us. Deriv does not accept app names containing "Deriv".