feat(examples): canton-token-template admin-layer properties (pause / authorization / supply conservation)#2
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Add a pure state-machine example modeling the OpenZeppelin
canton-token-template minting-control path (Rules_Mint,
consumeMintAllowance, assertNotPaused). Three admin-layer semantics are
expressed as invariants over random mint/pause/unpause sequences:
* pause — no mint may increase supply while paused
* authorization — only a minter-capability holder can mint
* conservation — cumulative capped minting never exceeds the issued
allowance (CIP supply invariant D3)
Following the Amulet example, each semantic has a fixed executor that
satisfies every invariant and a buggy executor that drops exactly one
guard. Five property tests (two positive AllPassed, three negative
FoundFailure) all pass; each negative test catches the corresponding
bypass with a minimal sequence.
These rows mirror the admin-layer proofs A1-A8 in the companion
daml-verify project, giving the canton-token-template admin layer both
SMT (daml-verify) and property-based (daml-props) coverage.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Summary
Adds a pure state-machine example (
DamlProps/Examples/AdminLayer/) modeling the OpenZeppelin canton-token-template minting-control path —Rules_Mint,consumeMintAllowance, andassertNotPaused. It gives the admin layer (AccessControl / Pausable / per-minter cap) property-based coverage to complement the SMT proofs A1–A8 in the companion daml-verify project.Three admin-layer semantics are expressed as invariants over random
mint/pause/unpausesequences:assertNotPaused(A8)requireRole(A1–A3)consumeMintAllowance(A6–A7)Design
Following the existing Amulet example's buggy/fixed pattern, each semantic has:
executeAdminFixed) that mirrors the real contract guards and satisfies every invariant for all action sequences, andexecuteAdminNoPause,executeAdminNoAllowance,executeAdminNoAuth).This proves the properties have teeth: each negative test catches the corresponding bypass with a minimal sequence.
Tests
Five property tests, all passing (
dpm test):test_adminInvariantsFixed— all five invariants hold under the fixed model (AllPassed)test_adminConsistencyFixed— minted supply always equals consumed allowance (AllPassed)test_adminAllowanceBypassDetected— conservation catches an allowance-cap bypass (FoundFailure)test_adminPauseBypassDetected— pause invariant catches a dropped pause guard (FoundFailure)test_adminAuthBypassDetected— authorization invariant catches a dropped role guard (FoundFailure)README "Dogfooding" section updated to document the new example as a third validated codebase.
🤖 Generated with Claude Code