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For mining purposes one needs to generate a seed. I read some articles but still did not understand where this seed comes from. How is calculated, or what it is about? I found this on Ethereum wiki github:

def get_seedhash(block):
 s = '\x00' * 32
 for i in range(block.number // EPOCH_LENGTH):
     s = serialize_hash(sha3_256(s))
 return s

Can anyone explain this code to me please ?

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Ethash divide hash calculation in epochs, with each epoch being 30000 blocks, all blocks in the same epoch start with the same seed.

For epoch 0 the seed is '\x00'*32 = '0x0000000000000000000000000000000000000000000000000000000000000000'.

For epoch N the seed will be the sha3 of the seed of the previous epoch N-1.

For example in epoch 1 the seed will be sha3('0x0000000000000000000000000000000000000000000000000000000000000000') = '0x290decd9548b62a8d60345a988386fc84ba6bc95484008f6362f93160ef3e563'.

  • So in an epoch there are 30.000 blocks? – Blnpwr Sep 30 '18 at 17:56
  • and is there any sources for reseraching? – Blnpwr Sep 30 '18 at 18:10
  • Yes, each epoch as 30,000 blocks. To research you can look at some clients implentations, like go-ethereum, cpp-ethereum or parity. – Ismael Sep 30 '18 at 18:20
  • Can we have a chat-room discussion? – Blnpwr Sep 30 '18 at 18:21
  • If you have any question you can ask here, when I've time I'd take a look. – Ismael Sep 30 '18 at 18:44

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