Note
Where きっと expresses a strong belief or confidence that something will happen or is the case, 確か に often additionally implies that the speaker has evidence or reasoning to support the certainty, or has personally verified the fact.
Breakdown of tashika ni
にni
at; on; in; to; for [indirect object particle]
確かtashika
sure, certain; reliable
Usages of tashika ni
たしか に そう です ね。tashika ni sou desu ne.
That's certainly the case, isn't it?
