reserve

fig. 3 · What remains of the reserve after k consecutive exits each taking the maximum tenth, with no fees arriving in between. After ten, about thirty five percent is still there.

The reserve is an account with no key. Its address is derived from the program id and the word reserve, which means it can be computed by anyone and controlled by no one. SOL arrives when the program claims creator fees and leaves only as retirement payments, each at most a tenth of the balance at that instant. There is no clock inside it. A quiet day leaves it exactly where it was.