Yes but we actually don’t know if a UTXO will be spent in the next block (superposition) until the block is mined (measured) and confirmed. Only by looking to the past can you derive ultimate certainty for that discrete unit of time, but this is the PAST state, not the present state. You literally don’t know its present state, yet it is fully probabilistic in nature where it will be in the next block. When spent, the UTXO ceases to exist as an independent particle/ data entry in space (memory), and new UTXOs emerge in its place in new space (memory) Time does exist for UTXOs, it is called blocks. It’s literally a measurement of distance between UTXOs (particles) in time. The UTXO only actually exists in memory of the block in which the transaction was observed (mined) in time. Bitcoin certainly quantized time.