Quote from: Ayers on July 19, 2017, 02:53:16 PM

Quote from: David Rabahy on July 19, 2017, 02:27:27 PM

Any digital circuit can be made reversible using components like the Fredkin and Toffoli gates. This includes SHA-256. As much fun as it would be, there is no fundamental need to develop a new algorithm for the Bitcoin PoW. It would truly be interesting to engineer a reversible SHA-256 computing device and see how it compares in speed vs. energy consumption against the current generation of non-reversible ASICs. In practice only the hottest portions of the circuit benefit from being made reversible. A hybrid circuit of both reversible and non-reversible sections is likely to be the one that gives the best trade-off of speed and efficiency.

yeah but if they are using private chip like for example in the baikal miners, you can-t get anything out of reverse engineering which is the same as recersible computer to me, you can build the board and anything but the chip is what matter

Hmm, it appears there's been a misunderstanding. Reverse engineering and reversible computing are very different things. One cannot take a non-reversible device and add something around it to make it reversible. One must reengineer a circuit from the gates on the chips up to make it reversible.