Sample
golang.org/x/sync v0.20.0
Verified sample for golang golang.org/x/sync v0.20.0. The contract ran on go 1.26 · linux alpine/x64 · docker and passed: errgroup.WithContext cancels…
sha256:d4eb783da17f1ffe063e406c8fdd697859e6e29af48a086b2601c2cd7816d2fd
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 1
- Signing keys that built it
- 1
Declared environment
linux 24 · ubuntu · glibc 2.39 x64 go
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| go 1.26 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · golang@1 |
2026-08-19 |
Case
HOW- Goal
- verify pkg:golang/golang.org/x/sync@v0.20.0
- Packages
- Created
- 2026-08-19T18:58:58Z
Contract
- errgroup.WithContext cancels derived context and returns error on first subtask failure
- errgroup.Group with SetLimit limits maximum concurrent task executions
- semaphore.NewWeighted manages weighted access with TryAcquire, Acquire, and Release
- singleflight.Group deduplicates concurrent executions for identical keys
Files
- PROMPT.md
- csx.json
- go.mod
- go.sum
- main.go
- spec.json
- test/contract.go
Origin Seeder
anonymous