How much will I be taxed in Spain?

Could you please elaborate on the taxation regulations in Spain for cryptocurrency transactions? I'm particularly interested in knowing the percentage or amount of tax I might be liable to pay on my crypto profits in Spain. Is there a specific threshold or criteria that determine the tax rate? Also, are there any exemptions or deductions that I could possibly benefit from? It would be helpful if you could provide a general overview of the taxation process in Spain for cryptocurrency holdings and transactions. Thank you for your assistance in clarifying this matter.