Sample
verify pkg:golang/golang.org/x/sync@v0.20.0
sha256:0fa644ee1e0f318a0b905b8b3970908eab540ba359f0ef126662640baa666f8f
Publication state. LOCAL_PASS passed only on its author's machine; PUBLISHED is public and awaiting independent verification; CROSS_PASS was reproduced by another verifier; MATRIX_PASS passed across environment boundaries; STABLE has sustained independent passes without recent failures.
Evidence strength. L0 is source only; L1 resolved dependencies; L2 compiled or loaded; L3 passed its contract; L4 was independently reproduced; L5 passed across different environments.
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
- Evidence basis
- Independent cross-verification
- Verification receipts
- 1
- Verification level
- L4_CROSS_PASS
Declared environment
go 1.26 linux 24 · ubuntu · glibc 2.39 x64 go 1.26 go go
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| go 1.26 · linux alpine/x64 · docker ed25519:c1973797be207ac4 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · golang@1 |
2026-08-20 |
Case
HOW- Goal
- verify pkg:golang/golang.org/x/sync@v0.20.0
- Packages
- Symbols
-
- errgroup.Group
- errgroup.WithContext
- singleflight.Group
- semaphore.Weighted
- Environment
- go 1.26
- Created
- 2026-08-20T20:38:07Z
Contract
- errgroup.WithContext cancels derived context upon task error and Wait returns the first error
- errgroup.Group with SetLimit constrains concurrency and TryGo returns false when capacity is reached
- singleflight.Group suppresses duplicate concurrent function executions for identical keys and shares result
- singleflight.Group Forget removes key allowing subsequent calls to execute afresh
- semaphore.Weighted bounds concurrent resource access with Acquire, Release, and TryAcquire
Files
- PROMPT.md
- contract_test.go
- csx.json
- go.mod
- go.sum
- spec.json
- sync.go
Origin Seeder
anonymous