Rick Cartman
It is what it is
Fairly standard contract structure. Lots of guys have their first year structured so that the base salary is league minimum and the rest is signing bonus.
Cuts the cap hit to $10M in the first year, as compared to $55M in the other four years of the contract.
Do you have any examples?
The only one i know of that's anywhere close to structured like this is Patrick Mahomes.

Deshaun Watson | NFL Contracts & Salaries | Spotrac.com
Deshaun Watson contract and salary cap details, full contract breakdowns, salaries, signing bonus, roster bonus, dead money, and valuations.

Patrick Mahomes | NFL Contracts & Salaries | Spotrac.com
Patrick Mahomes contract and salary cap details, full contract breakdowns, salaries, signing bonus, roster bonus, dead money, and valuations.