Single-word verb for “make immutable”

What would be a single-word verb for making something immutable (= unchanging over time or unable to be changed; generally used to describe objects in computer science)?

What I actually want to say is

UnmodifiableMap is a map with immutable keys and values. UnmodifiableKeySetMap is a modified version of UnmodifiableMap that only ??? the keys.

Answer

“Stabilize” could fit, but at a less forceful meaning than immutable.
Or “Freeze,” which implies no further change or movement.

Attribution
Source : Link , Question Author : Elist , Answer Author : Patrick Hughes

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