CodeSampleX

Sample

verify pkg:golang/modernc.org/libc@v1.74.4

sha256:a5e4d0d281f19d15a404374785a646e207f8a5f6a3d11ff914103e4a86c03f89

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

Operating system
windows 11
Architecture
x64
Package manager
go

Verification-run environments

go 1.26 · linux alpine/x64 · docker PASS
Execution context
go 1.26
Operating system
linux alpine · musl
Architecture
x64
Runtime
go 1.26
Language
go
Package manager
go
Execution
container · docker

CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · golang@1 · 2026-08-19

Case

HOW
Goal
verify pkg:golang/modernc.org/libc@v1.74.4
Packages
Created
2026-08-18T17:40:07Z

Contract

  1. libc.NewTLS initializes a valid thread-local storage context
  2. libc.CString creates a C-compatible null-terminated byte string and libc.GoString converts it back to a Go string
  3. libc.Xstrlen computes the string length of a C string correctly
  4. libc.Xstrcmp compares two C strings returning zero when identical and non-zero when differing
  5. libc.Xfree releases memory allocated by libc.CString

Files

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

Download the source artifact (tar.gz)

Origin Seeder

anonymous

Verification receipts

  • go 1.26 · linux alpine/x64 · docker PASS
    CONTAINER_RUN compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS golang@1
    ed25519:2175b912ea1c23b1