Part 4/9:
To further dissect this conversation, the differences between the UTXO and account models must be examined. The account model simplifies transactions by utilizing a single balance for users, akin to a bank account. However, this simplicity obstructs the parallel processing of transactions, as each must sequentially validate the updates to the global state.
Conversely, the UTXO model operates at a much more granular level, treating each coin as an individual entity. This means transactions are processed as discrete events, allowing multiple inputs to be checked concurrently. Issues arise when two transactions attempt to utilize the same coin, creating a potential bottleneck in these parallel processes.