1/ Ultra poor iteration is the only way to introduce "irreversible time" into formal systems. It is not only Turing's answer to the problem of completeness, but also naturally contains Prigogin's idea of "dissipative structure". This is precisely the core of Bitcoin's ability to achieve time trust consensus. 2/ The 'irreversibility' of BFT is only the irreversibility of computable paths, which is still logically reversible. It lacks the irreversibility of "thermodynamic time" and therefore cannot truly resist external manipulation. BTC was the first decentralized structure to introduce physical time into formal systems. 3/ Any system that does not include 'irreversible time' is inaccurate. Without time, there is no safety. Time is trust, Bitcoin is time machine, Turing Prigogine 4/ The innovation of Bitcoin is not currency, not blockchain, but encoding "thermodynamic time" into "formal logic". It replaces the static nature of code with super poor iterations and materializes time with proof of work. Bitcoin PoW irreversibility