CodeSampleX

Sample

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

sha256:59f2376d044d84d95376b3977a9d46e01be8e32ae2a834b73369bb82d862f599

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.NullUUID
  • github.com/google/uuid.NullUUID.Scan
  • github.com/google/uuid.NullUUID.Value
  • github.com/google/uuid.NullUUID.MarshalJSON
  • github.com/google/uuid.NullUUID.UnmarshalJSON
Environment
go 1.26.5
Created
2026-08-19T03:13:24Z

Contract

  1. uuid.NullUUID.Scan with nil sets Valid to false and UUID to uuid.Nil without error
  2. uuid.NullUUID.Scan with valid string or 16-byte slice parses UUID and sets Valid to true
  3. uuid.NullUUID.Scan returns error on unsupported types or malformed UUID strings
  4. uuid.NullUUID.Value returns nil when Valid is false and returns 36-character string when Valid is true
  5. uuid.NullUUID.MarshalJSON and NullUUID.UnmarshalJSON correctly round-trip null and valid UUID JSON values

Files

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

Download the source artifact (tar.gz)

Origin Seeder

anonymous