I blow the flame in my melted candle. Did I messed up my spellwork?

Generally blowing out a candle being used for spellwork ends the spell where as snuffing it pauses it. Every candle burns and melts differently, any number of things can make it go out by itself and its near impossible to predict. Depending on how close the spell was to being complete and the wording of said spell you should be fine. I hope this helps!

Welcome to the wonderful world of parallel but possibly clashing beliefs. :-) A large number of sources will say exactly what @Iridescent Cataclysm said (blowing out the flame "blows out" the spell while snuffing the flame "pauses" it), but there are those that state snuffing out a still-burning candle is equivalent to snuffing out your spell, as well as some that say one should never pinch out the flame of a still-burning candle because that cuts off the spell by "pinching" its energy off from the universe. I personally like the correspondence in the idea that blowing out the flame disperses/weakens the energy of a spell, but I suspect you'll find support for any number of interpretations. If your gut tells you the spell worked -- especially if you were practicing good fire safety! -- then I don't think you've created any problems. :-)

Hello there! I will have to agree with @Brian NobleHeartedLion. There´s a very important consideration here, remember that a candle is a tool, just that. The real magick and intention is found within you. So even if you blew out your candle, don´t doubt yourself! Keep your intention strong and focused, and your spell should work just fine! :)

That depends on your tradition that you follow. It’s generally only in pop new age witchcraft that blowing out the candle ends the spell. I’ve never heard of that in traditional witchcraft. Get to know the system of witchcraft you practice would be my answer.