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I've downloaded the Etash source code and did some test on the PoW algorithm. In MinerAux.h, if the current.seedHash != newSeedHash, the DAG file needs to be regenerated. And the newSeedHash was set by the rpc-client method getEthashWork (in EthashClient.cpp). I am confused by the method getEthashWork. I have some questions below:

  1. How to compute the three parameters “hash without seal, seed hash, target boundary"?
  2. When will the seed hash be different from current one?
  3. Which conditions will lead to the seed hash changing?

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