← Clarity theorytheory 0/50 · 0%

level 1

Curious · 0 XP

streak

perfect

badges

100 XP to Apprentice

Patterns · hard

48. Contract Upgradability & Router Patterns

Managing immutable contracts.

1 min read2 questionsup to 50 XPtopic 48/50

Read in another language

AI translates the explanation and quiz text while preserving code and answer scoring.

Clarity contracts are immutable once deployed. Upgradability is achieved by routing calls through proxy/router contracts that point to updated implementation principals via traits.

How to study this topic

1. Read the explanation once end to end, skipping the code.
2. Re-read the code snippets and say out loud what each line does.
3. Answer the quiz without scrolling back — that is the real check.
4. Read every explanation, even for the answers you got right.

Scoring

· Up to 30 XP from quiz accuracy.
· +15 XP for a perfect first attempt.
· +5 XP while a 3-day streak is running.
· 75% or higher marks the topic complete.

Check your understanding

1. Can a deployed Clarity smart contract's code be overwritten?
No, Clarity contracts are permanently immutableYes, with admin keyYes, within 24 hoursOnly if marked mutable
2. How do developers upgrade application logic in Clarity ecosystems?
Deploying new contracts and updating router/trait pointers in storageEditing the on-chain fileRe-running deploy command with same nameRestarting nodes

Badges

First light

Pass your first topic

Sharp shooter

3 perfect first-try quizzes

On a roll

Study 3 days in a row

Week warrior

Study 7 days in a row

Grinder

Earn 500 XP

Deep diver

Earn 1500 XP