A mathematician friend of mine pointed out that there are very few if any hash protocols that have survived for 10 years or more. What would Bitcoin’s solution be if SHA256 were to be cracked tomorrow?
SHA-1 lasted over ten years before being significantly weakened. Now, even 15 years in, full SHA-1 still has no known collisions. RIPEMD-160 has also held up for over ten years, as has GOST, Tiger, and probably others.