Le Central in San Francisco has kept the same stew going for over 40 years. A perpetual stew or soup is something from the era before refrigeration, constantly kept warm, never completely emptied and with new ingredients added to fill the pot.
So it is with the Linux kernel. It was released in 1991. Since then, there has always been something new. It mixes with the old and keeps on simmering.
The simplified timeline shows how Linux has evolved and continues to evolve. I picture two hands, one corporate and one community, putting in ingredients to keep the pot full.
Blockchain might evolve similarly. It began as an academic paper and cryptocurrency, away from any organized structure. Since then, it has been used by community organizations, along with corporations like Wells Fargo. Progress is happening in more places, all at the same time.