CodeSampleX

Sample

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

sha256:a61ddb496eabd2099991af593517e07592d3c46c15f148044c12a9a436c2626a

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
Environment
go 1.26.5
Created
2026-08-19T01:35:25Z

Contract

  1. NullUUID.Value returns nil when Valid is false and string representation when Valid is true
  2. NullUUID.Scan sets Valid=false on nil input and parses string and byte slice database representations
  3. NullUUID.Scan returns an error for invalid UUID representations and unsupported data types
  4. NullUUID.MarshalJSON produces "null" for invalid and quoted UUID string for valid NullUUID
  5. NullUUID.UnmarshalJSON decodes "null" into invalid and quoted string into valid NullUUID
  6. NullUUID.MarshalBinary produces empty slice for invalid and 16-byte slice for valid NullUUID
  7. NullUUID.UnmarshalBinary decodes 16-byte slice into valid NullUUID and returns error on invalid length

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