CodeSampleX

Sample

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

sha256:64bb92b02773e3b9e74755cb39e81fd62e68fa4e4b5c556cb9fe36dc96ead820

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 linux 24 · ubuntu · glibc 2.39 x64 go 1.22 go 1 wsl

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
Created
2026-08-19T10:18:17Z

Contract

  1. uuid.New generates a 16-byte RFC 4122 version 4 UUID with correct variant
  2. uuid.NewRandom returns a random version 4 UUID and nil error
  3. uuid.NewString returns a 36-character hyphenated UUID string accepted by Validate
  4. uuid.Parse successfully parses standard hyphenated UUID strings, unhyphenated 32-character hex, and urn:uuid prefixes
  5. uuid.MustParse parses valid UUID strings without panicking
  6. uuid.Validate checks UUID string syntax and rejects invalid formats or non-hex characters
  7. uuid.NewSHA1 and uuid.NewMD5 generate deterministic name-based UUIDs with RFC 4122 version 5 and version 3
  8. uuid.NewV7 generates RFC 9562 version 7 time-ordered UUIDs that sort chronologically
  9. uuid.UUID supports lossless text and binary marshaling via MarshalText, UnmarshalText, MarshalBinary, and UnmarshalBinary

Files

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

Download the source artifact (tar.gz)

Origin Seeder

anonymous