页面比较

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1. new framework version and upgrade plan. (doing. 11.20)

   1. epoch consensus strategy.Add dag info and remove uncle info.

   2. v2 version of block/block metadata.

   3. block reward logic review. such as remove uncle.

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1. Define and create Flexidag service instance.(done)

2. Replace the code that uses the Dag object with the one that uses Flexidag service message calls.(doing 11.10)