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Is it possible to consider a chain of blocks as an acyclic graph, where to add the next block (or node, if we are thinking about the blockchain as a graph), it is necessary to solve a computationally difficult problem, such as:

Find x, such that:

H(x) ≤ y, where y is a dynamically calculated target.

For Bitcoin, there seems to be such a formula that is suitable:

SHA256(SHA256(Н(block contents || nonce)) < targethash,

with various values of ​​nonce chosen until one is found that satisfies the above condition.

For Ethereum, from the yellow paper, we have: enter image description here

and what about other algorithms of PoW? Can they also be classified under such a description?

Sorry for my English. I hope my question will be clear. It will be great if you correct my mistakes

  • what do you mean by other algorithms of POW? do you mean the other proof of * (stake,..) – Badr Bellaj Oct 21 '16 at 14:51
  • I mean proof of work algorithms, which uses in other cryptocurrencies @Badr Bellaj – ethereum_noob Oct 21 '16 at 15:02
  • other crypto like ? for every project read its whitepaper – Badr Bellaj Oct 21 '16 at 15:12
  • Litecoin,Namecoin,Feathercoin... @Badr Bellaj – ethereum_noob Oct 21 '16 at 15:28
  • What are you intending to achieve by classifying blockchains as acyclic graphs? Are you wanting a discussion of the formal model of blockchains in academia as the answer to this question? – bekah Nov 24 '16 at 23:34

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