organic chemistry - What would be the correct mechanism for hydration of ethene?

Given above is the mechanism that I drew but my textbook puts it a bit differently. It says that the ethene is dissovled in the concentrated $\ce{H2SO4}$ to form ethyl hydrogen sulphate $\ce{CH3-CH2OSO3H}$ which when diluted with water reacts to form ethanol and the acid

$$\ce{CH3CH2OSO3H + H-OH -> CH3CH2OH + H2SO4}$$ So which mechanism is true?