Ask HN: Trust equity promises?

Howdy,

2-3 months ago I joined a startup that had & still has some problems. I was promised the CTO position along with some equity & wage on the next round. So I've been doing the work because it's a crucial time, but still nothing on paper, I told them and say to wait a bit more till we get the next funding, since the cap table will change. I've been told some numbers, but they keep changing, and I don't really trust them. Am I irrational to demand that I know what my equity & salary will be and on writing somehow?

P.S: It's not a US company.

Thanks in advance