Proof of ...what ?

Good breakdown between proof of work and proof of stake consensus.

https://medium.com/@jaybny/on-proof-of-skill-6af149f45ce8

Tangles, DAGs, and IOTA

https://youtu.be/I_jNH9BlEEo

In IOTA every user is a 'miner' and it's not really a blockchain, but Tangles , DAGs and graph theory in a sense.   Good video.

Scaling Blockchain by thinking like a biologist

Great line about scaling blockchain. I agree.  So maybe we should start working with biologists and chemists and strategize a way to design and scale blockchain in terms of independent distributed biological nodes.

"Systems will never scale if you require global consensus for local actions by independent agents. For example, I should not have to know where every dollar in the economy is when I want to buy something from you"

https://blog.p2pfoundation.net/arthur-brock-blockchains-major-design-flaw/2016/03/15?utm_source&utm_medium&utm_campaign