CodeSampleX

Sample

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

sha256:ad0a65aabddba877991db5e011d67f1c9a0ca52bbf35458006c062174092581d

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 windows 11 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/github.com/google/uuid@v1.6.0
Packages
Symbols
  • github.com/google/uuid.NewRandom
  • github.com/google/uuid.NewRandomFromReader
  • github.com/google/uuid.FromBytes
Created
2026-08-19T08:39:50Z

Contract

  1. uuid.NewRandom returns a valid Version 4 UUID with RFC4122 variant
  2. uuid.NewRandom produces unique UUIDs across successive calls
  3. uuid.NewRandomFromReader constructs valid Version 4 UUID from custom entropy reader
  4. uuid.NewRandomFromReader produces deterministic UUID output for identical entropy input
  5. uuid.NewRandomFromReader returns error when reader returns insufficient bytes
  6. uuid.FromBytes parses 16-byte slice into UUID and rejects invalid lengths
  7. uuid.String format produces 36-character hyphenated representation that round-trips with uuid.Parse

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