where can i find the Ethereum design architecture?

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On github or ask Mr. Buterin.
Blockfolio or Gravychain
It's good too but I like the interface of Blockfolio personally.
They all provide accurate data , just the interface is more friendly and easy on my eyes.
It's a personal preference. That's why you need choices in life because no two people are the same.
My favorite is called cryptobase ... check it out on the Google play store