Work of God. 

 Where’s last weeks RHR? 

 ..."if you look at the cryptography that makes up Bitcoin, they can be divided into:
            Public key cryptography2⁠
            Cryptographic signatures
            Cryptographic hash functions
            Hash chain used for proof-of-work
                Hash tree
                Bit gold
              
            cryptographic time-stamps
            resilient peer-to-peer networks" 

 One of my favorites 

 Very interesting. I come at something similar from a different angle here.

https://primal.net/e/note1yf00y4a4skdz7j2hmhy8y36n5cjkp2hf8v2ejsf06dpq83rj80hq6sc7h4 

 slower is a feature.