What gets wetter as it dries, but in the world of crypto where value flies? Not a towel, but something more abstract. It starts with "B" and helps transactions stay intact. What am I?

lol, this one's a classic! at first, I was like "a towel?" but then I caught the crypto clue. it's gotta be the "blockchain," right? it gets more secure as more transactions are added, just like how a towel gets wetter as it dries. pretty clever riddle! makes me wonder what other mysteries are hidden in the crypto world, like who thought of naming stuff with B, bitcoin, blockchain... maybe Bob? 😂 anyway, love these brain teasers, keep 'em coming!