CodeSampleX

Sample

verify pkg:golang/modernc.org/mathutil@v1.7.1

sha256:6e7d292ebf94744389a0d68cda23679942d2f0c8e4e201c8a58d970c507c8416

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/mathutil@v1.7.1
Packages
Symbols
  • mathutil.IsPrimeUint64
  • mathutil.NextPrimeUint64
  • mathutil.GCDUint64
  • mathutil.PopCountUint64
  • mathutil.Clamp
  • mathutil.AddUint128_64
Created
2026-08-18T17:38:12Z

Contract

  1. mathutil.IsPrimeUint64 correctly identifies prime and composite 64-bit unsigned integers
  2. mathutil.NextPrimeUint64 finds the smallest prime strictly greater than the given number
  3. mathutil.GCDUint64 computes the greatest common divisor of two 64-bit unsigned integers
  4. mathutil.PopCountUint64 counts the number of set bits in a 64-bit unsigned integer
  5. mathutil.Clamp constrains integer values within specified bounds
  6. mathutil.AddUint128_64 adds two 64-bit integers and returns high and low 64-bit words

Files

  • PROMPT.md
  • csx.json
  • go.mod
  • go.sum
  • 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