"So if reality preserves truth, how?" This is not actually a coherent sentence and I think it may point to why you keep coming back to circularity. Reality IS Truth. Truth is immutable. Reality does not preserve. Preserve is an action within time of maintaining order against entropy. I think you can coherently say: Bitcoin preserves order through a meta-order process of cryptography. (Cryptography is the art of securing information. In-formafion. Aka order. It is order-hardening or anti-entropic techniques.) "What executes the logic?" That's a computer term. Logic is not the output of computation but the ordering principle that makes it possible. "Executes logic" is actually word slop, though I use that shorthand too. "Executes instructions (in-structure) into which we have encoded logic by use of rational intellect." Is a more fully expanded version. "What enforces the boundary that keeps past states from becoming false? What preserves truth across time instead of letting it collapse into contradiction?" Again, that is no a coherent construct. True does not become false and false does not become true. Logic is axiomatic ground. If you don't accept logic as the foundation you fall into infinite regress. Something has to be axiomatic and it has to be this or you couldn't even ask the question so it would by definition be nonsense. Bitcoin runs on computers but its truth is not fundamentally computational either. The computers automate a game. The game is between people. We are distributed witnesses who can discern truth because we have rational intellects and the world is intelligible. We are using computers to automate the game to maintain agreement on facts and prevent anyone from cheating. It is only because our rational intellects grasp higher order that we can have a game of agreeing upon truth and goodness (value) to coordinate and align our actions toward higher levels of order against an entropic phicial world. Computers provide a way to use the physical limitations of the world to do cryptography and make it virtually impossible to cheat. This is necessary because we have free will and can choose lesser goods. God does not have this problem. His will is pure, perfect and unchanging. He IS truth. He IS logic. And that is not a mere assertion, it is a necessary logic conclusion. But our cheating problem has led to a solution that approximates the ordering principles of time and can teach us about it. This is poetic and God is good. He always makes a higher good our of our evil choices in the end. Of course. If we ask what preserves truth itself, well what preserves that, and that and that... Infinite regression and circularity are both illogical by definition. So there has to be and uncaused cause and it must be Logos. Or reality is a contradiction and then it doesn't exist