.-----------.    .-------------.    .--------------.    .--------------------.    
| sigverify +--->| lock memory +--->| validate fee +--->| allocate accounts  +--->
`-----------`    `-------------`    `--------------`    `--------------------`    
                                
    .------------.    .---------.    .--------------.   .--------------.
--->| load data  +--->| execute +--->| commit data  +-->|unlock memory |
    `------------`    `---------`    `--------------`   `--------------`