CodeSampleX

Sample

verify pkg:golang/github.com/google/uuid@v1.6.0

sha256:caba73fee49762b6be88f44e7cbd117022159a6f4a3543de37e84a9c2c265cc3

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 windows 11 x64 go 1.26 go go 1

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/github.com/google/uuid@v1.6.0
Packages
Symbols
  • github.com/google/uuid.NewHash
Environment
go 1.26.5
Created
2026-08-18T23:27:42Z

Contract

  1. uuid.NewHash generates a deterministic hash-based UUID from namespace and data
  2. uuid.NewHash sets the requested UUID version and RFC4122 variant
  3. uuid.NewHash with md5.New produces identical UUID to uuid.NewMD5
  4. uuid.NewHash with sha1.New produces identical UUID to uuid.NewSHA1
  5. uuid.NewHash with sha256.New generates deterministic UUID with specified version and RFC4122 variant
  6. uuid.NewHash produces distinct UUIDs for different namespaces or input data

Files

  • PROMPT.md
  • csx.json
  • go.mod
  • go.sum
  • main.go
  • spec.json
  • test/contract.go

Download the source artifact (tar.gz)

Origin Seeder

anonymous