it's not a system if it is concurrent and divisible. the block is the quantum of the bitcoin system. it's hard to comprehend maybe because you are subjective as a user who creates UTXOs to think of them as like subatomic particles, but they are not. the whole block is a single number. all data can be represented as a number, it doesn't matter that it involves up to 4 megabytes of bits. this is still one number. if you have to point at two or more things, you aren't talking about a system, you are talking about a process of discovering the next state of the system. a system is a collection of things, and a quantum is the smallest unit of the WHOLE SYSTEM. quantum states of electrons are also not singular, but composed of multiple coordinates, and each quantum state consists of a cycle that recurs periodically. thus, the quantum state of bitcoin is the block, as this is the point at which the system is coherent and recognisable. you can't have UTXOs outside of the context of bitcoin, even though you can't have bitcoin without it being made out of UTXOs, the apex of the ontology is the whole system, and the apex of its state is the block. apex is a point, a quantum, the smallest measurable state of the system.

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i could also point to nyquist sampling theory, the same thing applies. if you are not sampling the data at double or more than the periodicity of a signal, you lose information, or worse, you have multiple, contradictory informations that you can't distil to a single measurement. also, it's long been my opinion that quantum theory in general is an attempt to find that elusive atomicity of the phenomenon of physical reality. concurrency is much more important for understanding the *process* by which a system moves from one state to another. you have to understand the process in order to control it, otherwise you are just throwing dice and hoping you don't get snake eyes. UTXOs are the *reason* for running bitcoin, because of their scarcity. but bitcoin itself is a series of blocks. if you read up on how a bitcoin node interacts with all of the data that comes from peers and how it works, the block is the centre of the system, the block height represents the scalar of the state and the block hash (really, the hash of the header with the merkle root of the transactions) is the digest of the system state at that block height. i didn't also mention the fact that the history of the chain is not immediately fixed when a new block is minted. it can happen that concurrently two miners emit a valid solution at the same time, so there is also a rule that the smallest hash is preferred to build the next block on. but until that next block is found, the head of the chain is only hypothetically the best block, and it is only once 6 blocks have stacked up on top of a block that the probability of it being forked off the main chain goes so low you can say it's now immutable.
Utxo are not subatomic particles here in our domain. But in relation to bitcoin as a closed informational domain, they are. No information within bitcoin moves faster than the speed of blocks. Once a block is found, it is transferred physically here thru light bounded by the speed of light and network latency. Im simply trying to observe what they are. The network is a partition of the universe. Bitcoin is some quantum of the universe, it is some fraction. Yet this is the first time we see true lasting information no longer subject to the process of entropy, it’s resolved permanently, or crystallized. So long as a copy of the ledger exists. It is a fractal process of occurrence, embedded within, not separate. “the apex of the ontology is the whole system, and the apex of its state is the block. apex is a point, a quantum, the smallest measurable state of the system” - agreed. So by literal definition, is bitcoin a quantum computer? What happens when we apply absolute scarcity to Kelvin? image